## Search help by categories

• ### Getting Started

DAQ Basics
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• Getting Started

## Common DAQ Questions

### What LabJack Is Recommended for New Applications?

The LabJack T7 is the most versatile, best bang-for-your-buck DAQ offered by LabJack or anyone else that we know of. Of course, it isn't perfect for every application or project. Compare all LabJack hardware side by side or read a detailed comparison of the different LabJack devices.

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### What does 12- or 16-bit resolution mean?

What is resolution?

Resolution in this context refers to the conversion of anÂ analog voltageÂ to a digital value in a computer (andÂ vice versa). A computer is a digital machine and thus stores a number as a series of ones and zeroes. If you are storing a digital 2-bit number you can store 4 different values: 00, 01, 10, or 11. Now, say you have a device which converts an analog voltage between 0 and 10 volts into a 2-bit digital value for storage in a computer. This device will give digital values as follows:

 Voltage 2-Bit Digital Representation 0 to 2.52.5 to 55 to 7.57.5 to 10 00011011

So in this example, the 2-bit digital value can represent 4 different numbers, and the voltage input range of 0 to 10 volts is divided into 4 pieces giving a voltage resolution of 2.5 volts per bit. A 3-bit digital value can represent 8 (23) different numbers. A 12-bit digital value can represent 4096 (212) different numbers. A 16-bit digital value can represent 65536 (216) different numbers. It might occur to you at this point that aÂ digital inputÂ could be thought of as a 1-bit analog to digital converter. Low voltages give a 0 and high voltages give a 1.

In the case of the LabJack U12, a single-ended analog input has a voltage range of -10 volts to +10 volts (20 volt total span) and returns a 12-bit value. This gives a voltage resolution of 20/4096 or 0.00488 volts per bit (4.88 mV/bit).

## Compare In-Stock 12, 16 and 24 Bit LabJack Devices

Â

What does it mean to say a device is 12-bit, 16-bit, or 24-bit?

When you see analog input DAQ devices from various manufacturers called 12-bit, 16-bit, or 24-bit, it generally just means they have an ADC (analog to digital converter) that returns that many bits.Â  When an ADC chip returns 16 bits, it is probably better than a 12-bit converter, but not always.Â  The simple fact that a converter returns 16-bits says little about the quality of those bits.

It is hard to simply state "the resolution" of a given device. What we like to do, is provide actual measured data that tells you the resolution of a device including typical inherent noise.

If you look at a device called "24-bit" just because it has a converter that returns 24-bits of data per sample, you will find that it typically provides 20 bits effective or 18 bits error-free (like the UE9-Pro).Â  The U6-Pro and T7-Pro provide some of the best performance around from a 24-bit ADC, and they do about 22 bits effective or 20 bits error-free.Â  You will see with these devices we might mention they have a 24-bit ADC (as that is what people look and search for), but we try not to call them "24-bit" and try to stick with the effective resolution.

Another interesting thing about your typical 24-bit sigma-delta converter, is that you can look at them as only having a 1-bit ADC inside, but with timing and math they can produce 24-bit readings:

https://www.maximintegrated.com/en/design/technical-documents/tutorials/1/1870.html

Additional device-specific resolution information can be found in the respective device datasheet:

U3 Resolution

U6 Resolution

UE9 Resolution

T4 Resolution

T7 Resolution

### What is a LabJack?

LabJacks are USB/Ethernet/WiFi based measurement and automation devices which provide analog inputs/outputs, digital inputs/outputs, and more. Â A LabJack is an essential part of a computer-based instrumentation. Â If you want to make a computer-based system that acquires readings from various sensors/transducers, and controls various outputs/actuators, you need a LabJack to go between the computer and the various inputs and outputs.
Go to our main FAQ page for more basic questions like "What is DAQ (data acquisition)" and "What is an analog input".

### What is DAQ (data acquisition)?

DAQ is short for data acquisition, which is short for data acquisition and control.Â  The term describes the process of acquiring readings from sensors and transducers (temperature, pressure, strain, etc.), and controlling actuators (relays, solenoids, etc.).Â  In our case the emphasis is on computer-based DAQ, where the LabJackÂ is the interface that allows a computer to read from sensors and control actuators.

### What is an amplifier, PGA or PGIA?

A PGA (Programmable Gain Amplifier) provides variable gain which is controlled in software. It is used to amplify low voltages on analog inputs. Most LabJacks have an internal PGA that can be used to provide small gains in some situations, but for larger gains an external amplifier must be used.

### What are counters and timers?

Counters and timers are useful features available on some digital I/O.Â  On T-series devices they are called digital I/O extended features (DIO-EF).
A counter increments an internal register each time the voltage on a digital input changes from low to high (or vice versa).Â  This internal register can then be read at any time to get the current count.Â  Some typical uses are measuring frequency (change in counts over some time period) or monitoring a tipping bucket precipitation (rain) gauge.
A timer can have various capabilities such as PWM output, frequency measurement, pulse width measurement and quadrature counting.

### What is an analog output (AO, DAC)?

AO = Analog Output
DAC = Digital to Analog Converter
The LabJack's analog outputs convert digital values from a computer into a variable voltage level presented on an output terminal. This provides an adjustable output.

Every LabJack DAQ features analog outputs that appear on the "DAC" terminals. For applications requiring more analog outputs or a larger analog output voltage range than your LabJack has built in, simply add the LJTick-DAC.
The maximum number of expandable analog outputs varies by device.
Visit our LabJack Product Comparison page to reviewÂ a complete breakdown of analog outputs, resolution, sensor compatibility, communication protocols (USB, Ethernet, WiFi) and software support.

### What are digital I/O? (IO, D, DIO, FIO, EIO, CIO, MIO)

DIO = Digital Input/Output
IO/D/FIO/EIO/CIO/MIO = Somewhat arbitrary monikers for specific DIO ports on different LabJacks.Â

Digital I/O stands for Digital Input and Output. Digital Inputs allow a microcontroller to detect logic states, and Digital Outputs allow a microcontroller to output logic states.

Each digital I/O on a LabJack can be individually configured to one of 3 states: input, output-high, or output-low.

Digital Input:Â A digital input detects if a voltage is above/below a specific threshold. If the voltage is higher than some value, the computer will detect the digital input as high/set/1. If the voltage is lower than some value, the computer will detect the digital input as low/clear/0.

Digital Output:Â A digital output allows you to control a voltage with a computer. If the computer instructs the output to be high, the output will produce a voltage (generally about 5 or 3.3 volts). If the computer instructs the output to be low, it is connected to ground and produces no voltage.

### Example:

Turn an LED On/Off using a digital I/O.

Â

1. Wire the LED as shown. Optionally connect a current-limiting resistor.
2. Set the state of FIO0 to output-high on the computer. The LED will turn on.
3. The LED will turn Off if the state of FIO0 is set to output-low.

### Where Are LabJack Datasheets?

All LabJack Datasheets, App Notes, Quickstart Tutorials, Software, Firmware, Drivers, Examples and everything else are available under the Support Tab

### New to Data Acquisition (DAQ)? Not Sure Where to Start?

Talk to an experienced LabJack staff member or engineer at a mutually convenient time. Or try chatting online right now! Our engineers provide real-time live chat Monday-Friday between 9AM-11AM and 2PM-4PM Mountain Time. Click the chat bar in the bottom right of any page. Not online? Email Support@LabJack.com or call us at +1(303)942-0228

A2.Â My analog input is returning varying values but not the right value.

A3.Â My readings are too noisy.

A4. How do I measure temperature using a thermocouple, RTD, thermistor or other?

A5. My thermocouple readings are wrong.

• Determine if the error is from the cold junction sensor, the A/D conversion, or the signal itself.
• If the cold junction reading is off by a few degrees that error will show up in your calculated thermocouple temperature.
• Remove the thermocouple, and instead jumper the analog input (or both analog inputs for differential) to GND. The thermocouple voltage is now 0.0 volts which is saying both ends of the thermocouple are at the same temperature and thus the thermocouple temperature you calculate will be equal to the cold junction temperature.
• Remove the thermocouple from the system under test and instead just set it next to the LabJackÂ so the thermocouple is measuring air temperature near the LabJack. If the terminals you are connecting to are at air temperature (e.g. CB37 terminals), the expected voltage is 0.0 volts. If the terminals you are connecting to are warmer than air temperature (e.g. T7 terminals), the expected voltage is a negative value dependent on the temperature difference.
• SeeÂ Thermocouple Complications.
• SeeÂ Thermocouple Troubleshooting Tips.

A6. I need to monitor a 4-20 mA current loop signal or measure some other current.

• LabJack analog inputs measure voltage. The LJTick-CurrentShunt is an easy way to convert 4-20 mA to voltage.Â  See theÂ Measuring Current App Note.

A7.Â Should I use differential?

A10. How do I measure pressure?

A11. Can I measure AC or DC?

• Yes, both. When you ask for 1 sample from the LabJackÂ you get the voltage at that moment.Â  If the signal is DC, you expect multiple samples over time to return the same value.Â  If the signal is AC, the samples are taken at different points of the waveform and thus will return different values.
• If you want to acquire the waveform for an AC signal, you simply acquire multiple samples over time, which is often done usingÂ stream mode.Â  Then if wantedÂ you can do math on the waveform to determine parameters such as max/min, RMS, or frequency.
• On T-series devices you can use theÂ AIN-EFÂ systemÂ toÂ acquireÂ multiple samples over time, doÂ some math, and returnÂ various values that describe the multiple samples (RMS,Â Peak-to-Peak,Â Period,Â Average,Â Max/Min).
• See theÂ Measuring 120/240 VAC App Note.

A12. What is the max data rate?

• We have lots of detail for sample rates.Â Â U12,Â U3,Â U6,Â UE9,Â T-Series.
• For stream mode we usually specify the max sample rate.Â For max scan rate divide the max sample rate by number of channels. SampleRate = ScanRate * NumChannels.
• Extended channels on the Mux80 act just like normal channels.Â  The max sample rate of the LabJack is still the same, you just use a bigger number for NumChannels in the above equation.

### Can LabJack be used for Industrial Applications?

LabJack Devices:
• Can comfortably operate within the industrial temperature range (-40Â°C to 85C)
• Are capable of being mounted via DIN Rail/Snap track
• IntegrateÂ with Voltage Dividers for 24+ Volt signals
• NEMA 3 (or greater) enclosures recommended for any outdoor or indoor applications with dust, debris or in condensing humidity environments
• All LabJack products are covered by our industry leading 5 year warranty
• Have OEMÂ Versions available for custom and embedded applications.Â
• Drawings and CAD Models ProvidedÂ
• LabJack products are very robust, but subject to the influence of user connections.
• LabJack is not liable forÂ any losses, expenses or damages beyond the LabJack device itself.Â  See ourÂ Limitation of LiabilityÂ for more details.

### Drawings, Dimensions, 3D Models, CAD Models

LabJack enclosure and OEM drawings and models are provided in several neutral file formats. Please see the links below to navigate to the correct LabJack.

### What Type of Sensors Can I Connect to LabJack?

LabJack hardware can be connected to nearly any analog or digital sensor. Of course some sensors are easier than others to connect. If you haven't yet purchased your sensors please check out our App Notes for detailed guides and best practices. Generally the best sensors output an analog voltage in the 0-10v DC range. We have many signal conditioning modules we refer to as "Ticks" that make it easy to accept other signals and ranges

### How Do I Get In Contact with LabJack?

We believe written communication (live chat, email) is the best way to provide the best support. We can take a moment to research/test as needed, we can provide links to the extensive documentation on our site, we get a record of everything that was discussed, and we can easily loop in multiple engineers as needed.

Live Chat

Hop on a live chat with the engineers who design and develop our products here in Colorado, USA. We are on chat Monday through Friday from 9-11 am and 2-4 pm, Denver time. Look for the chat bar at the bottom-right of every page at labjack.com

Contact Form

For technical questions or any other kind of question, please fill out our contact page or email us support@labjack.comÂ Submitting this form will not add you to any mailing lists.Â  If you don't hear back within 24 hours, something likely went wrong, so don't hesitate to contact us via another method.

### Data Acquisition Examples

Read the output of sensors which measure voltage, current, power, temperature, humidity, wind speed, force, pressure, strain, acceleration, RPM, light intensity, sound intensity, gas concentration, position, and many more. A LabJack brings this data into a PC where it can be stored and processed as desired.

Control things like motors, lights, solenoids, relays, valves, and more.

https://shop-labjack-com.myshopify.com/blogs/news/tagged/applications

ADC = Analog to Digital Converter

An analog input converts a voltage level into a digital value that can be stored and processed in a computer. Why would you want to measure voltages? There are a multitude of sensors available which convert things like temperature, pressure, etc. into voltages.Â  The voltages can then be easily measured by various kinds of hardware, such as a LabJack U3-HV, and then read into a computer.Â  The computer can then convert the voltage value into it's original type (temperature, pressure, etc) and the value can then be stored in a file, emailed to someone, or used to control something else outside of the computer.

### Example:

1. Wire the output of the analog temperature sensor to a U3-HV as shown.
2. Read the voltage on the computer to know the current temperature.Â
3. This particular sensor outputs 0.01 volts per Â°F, so 0.76V corresponds with 76Â°F.

## General Ordering Info

### Compliance, Conformity, Country of Origin, MTBF, EoL

Many of our products have been tested forÂ CE marking, which reflects FCC compliance, EMC (electromagnetic compatibility), EMI (electromagnetic interference), RF emissions, RF immunity, and the ability to survive ESD (electrostatic discharge).Â  Part of the CE mark is aÂ Declaration of ConformityÂ where we describe the standards LabJack devices are tested to meet. Our Declarations of Conformity can be found below.

All LabJack-branded products areÂ CE,Â REACH,Â RoHS2, andÂ CFMÂ (Conflict-Free Minerals) compliant.

## CE - Declarations of Conformity

See the links below for the Declaration of Conformity certificates for LabJack devices.

## Conflict Free Minerals

The LabJackÂ Conflict Minerals (CM) policyÂ can be found at thisÂ Link.
The LabJack Conflict Minerals Reporting Template (CMRT) spreadsheet can be found at thisÂ Link.

The LabJack Extended Conflict Minerals Reporting Template (EMRT) spreadsheet can be found at this Link.

## RoHS and REACH

The LabJack deviceÂ RoHS and REACH compliance policy is here.

## Toxic Substance Control Act

The LabJack device compliance policy with the Toxic Substance Control Act (Code 40, Part 751) can be found here.

## US California Proposition 65 Act

The LabJackÂ device compliance letter for the United States California Proposition 65 Act can be accessed here.

## PFAS, PFOS, & PFOA Compliance

The LabJack device PFAS, PFOS & PFOA compliance statement can be found here.

## Counterfeit Parts Prevention (CPP) Policy

The LabJack device Counterfeit Parts Prevention (CPP) policy can be found here.

## Letter of Volatility (LoV)

Letters of volatility describe the various memory within a device, what is volatile and what is non-volatile, how information can be stored in memory, and how memory can be cleared.Â  Links to the letters of volatility are listed below, and if your device is not listed contact us and we can add it.

## Certificate of Conformance

Also called a Certificate of Conformity, Certificate of Compliance, or CoC. This is a simple industry standardÂ document stating that our products comply with our standards for quality, specifications and workmanship.Â  A blanket CoC is can be found here.Â  If you need a different variation pleaseÂ contact us.

## UL, CSA, or similar electrical safety standards

All LabJack products are low voltage, therefore these electrical safety standards do not apply.Â  In the case of the RB12 and RB16, modules provided by other manufacturers might have a UL listing or similar.

## Flammability

• LabJack's red enclosures:Â  UL 94 HB, Sabic Polycarbonate Lexan 143R, E75735.
• LabJack's PCBs:Â  UL 94V-0, E304660Â (M1 or N2).
• Screw Terminals:Â Â UL 94V-0, Thermoplastic,Â E245249.
• Snaptrack:Â  UL 94V-0, PVC, E58648.
• RB12/UE9 Power Jack: Â UL 94V-0, PBT 4815,Â E59481.
• USB Connector: Â E59481, PBT UL 94V Rated
• Pin Headers: Â E53664, 30% Glass Fiber PBT

LabJack Device & Accessories Flammability statement.Â

## Country of Origin

Per export definitions, the official Country of Origin for most LabJack-branded products is USA.Â  The only exceptions are the 2034DZ and 2034CAZ temperature probes, which are China.

All software written byÂ LabJackÂ also has the Country of Origin of USA.

We do not claim the phrase "Made in the USA". ThisÂ special designationÂ requires that all raw materials are mined in the USA, and that all chips and components are manufactured in the USA. That is not feasible for any electronic devices.

## Export

Export codes are assigned to everything we sell.Â  For example, the schedule B code for the T7 is 8471.60.1050 and applies to the entire package including the T7 itself, power supply, USB cable, Ethernet cable, screwdriver, packaging, firmware and software.Â  Firmware and software are part of our hardware.Â  We do not sell any firmware and software so these do not have their own export codes.

### Schedule B / HS / HTS

Main Devices (U3, T7, etc.): Â 8471.60.1050
Accessories designed for use with LJ main devices: Â 8473.30.0002
Sensors & Probes (LM34, EI-1022, EI-1034, EI-1050, 2034DZ, 2034CAZ): Â 9031.49.8000
3rd Party:Â  Codes provided by manufacturer

### ECCN

4A994.a
Which means license is NLR (no license required) as long as we don't export to the prohibited countries.

### Prohibited Countries

Cuba, Iran, North Korea, Sudan and Syria

### ITAR

Does not apply to our products

## ProductionÂ Status, End of Life (EoL)

Below are the production statuses for all data acquisition (DAQ) devices ever made by LabJack:
• U12 (2001): NRND (Not Recommended for New Designs). No plans to discontinue.Â This is our oldest device, and we have newer devices that are recommended for new users. As of this writing there is no indication that any major sub-components will become unavailable.
• UE9 (2004): NLA (No Longer Available as of March 2022).Â  Many parts required to build the UE9 have been discontinued by their manufacturers. Production of the UE9 has become increasingly difficult and expensive, if not impossible. The T7 is a newer (not drop-in) replacement that is superior in every way including cost.
• U3 (2006): Active. All variations of U3-HV and U3-LV. Estimated time horizon of 2030, due to production ending for the main microcontroller. SeeÂ Section 2.13 of the U3 DatasheetÂ for information about older hardware variations.
• U6 (2009): Active. All variations. Estimated time horizon of 2030, due to production ending for the main microcontroller.
• T8 (2022): Active. All variations. No plans to discontinue.
• T7 (2013): Active. All variations. No plans to discontinue.
• T4 (2017): Active. All variations. No plans to discontinue.
• LJTick-InAmp Rev 2 (2005): EoL, NRND (Not Recommended for New Designs). A newer, simpler, InAmp isÂ available. Rev 2Â has been replaced by Rev 3.

## Production status of other non-Active devices made or sold by LabJack

### End of Life (EoL)Â Notice, EI-1040

The EI-1040 dual instrumentation amplifier, manufactured by Electronic Innovations Corporation and sold by LabJack, has been discontinued.

### End Of Life (EoL) Notice, EI-1050

NLA (No Longer Available):Â  The EI-1050, manufactured byÂ Electronic Innovations Corporation and sold by LabJack, has been discontinued. TheÂ Sensirion sensor it uses is no longer available.Â  TheÂ EI-1050 DatasheetÂ has information about alternate devices.

### End of Life (EoL) Notice, EB37

NLA (No Longer Available): The LabJack EB37 evaluation board has been discontinued as of May 2022.

## Mean Time Between Failure (MTBF)

LabJack has not done official MTBF analysis or testing for any devices. LabJack devices are made of normal semiconductor components, and do not use any components with a rating in terms of limited lifetime. Â It is rare for our devicesÂ to fail on theirÂ own. Â Overwhelmingly, the failed devices we see have damage that can be attributed to an out-of-spec voltage or current that has been introduced to the device from some external source. This is the nature of data acquisition devices with user controlled connections spanning from communications, power, ground, and I/O.

The following link mentions a DoD document that could be used to generate an MTBF number based on statistical models:

http://www.computerworld.com/s/article/105781/MTBF

Below is a quote from someone at a major university who needed to assign an MTBFÂ to our products:

"Typically, for an electronic device such as yours, with off the shelf components, and with an approximate number of parts-by-count of roughly 50, I should expect an MTBF of 30K~75k hours. I'll probably utilize some figure within that range."

50k hours is about 6 years of continuous use, which we can say from experience is too low.Â  We would estimate that operating 100 devices continuously for 10 years would result in 10 failures not due to external forces, and thus our estimate for statistical MTBF would be 500k hours or 57 years.

# LabJack Shipping Policy

## Domestic (USA)Â

• Orders over \$150 ship FREE via UPS Ground
• Customers needing faster delivery can select 2nd Day Air, Overnight Delivery orÂ Contact UsÂ for special handling instructions or to use your own carrier/account (FedEx, USPS, etc)
• Expedited shipping charges for your order will be calculated and displayed at checkout.
• Colorado customers are welcome to pick-up your order along with freeÂ LabJack schwag

## International/Global

• LabJack offers DHL or UPS for international shipping. Shipping charges for your order will be calculated and displayed at checkout. Most international orders are shipped the same business day they are received. Delivery time is generally 2-7 days depending on your specific location.Â
• Your order may be subject to import duties and taxes (including VAT), which are incurred once a shipment reaches your destination country.Â LabJackÂ is NOT responsible for these charges if they are applied and are your responsibility as the customer.
• LabJack also has more thanÂ 30 international distributorsÂ who offer LabJack hardware and provide customer service and support. A LabJack may be closer to you than you think.

## Shipping Terms:

• Default shipping termsÂ we state on paperworkÂ are incoterm EXW.Â Contact us if you need different terms
• Carriage CostÂ is the responsibility of the buyer.Â  1) LabJack charges the buyer for carriage and LabJack then pays the carrier, or 2) The buyer provides their carrier account number and carriage isÂ charged to that account.

### Sales Tax Exempt, Wholesale Pricing, Resellers, Distributors

If you paid us sales tax, but don't think you should have, you must request such a refund within 15 days of the transaction.Â  Sales tax refunds are complicated from the get-go, but they are even worse after we send the money on to the government.

### International LabJack Distributors

A LabJack may be closer than you think. We have distributors in:

### How Can I Get a Free LabJack Shirt or Hat?

LabJack offers a variety of hats, shirts and other "merch" for our raving fans and supporters who will wear it with pride. Request one by entering a comment with your next order or email us and ask nicely.

## Requesting a Quote

### Sales Tax Exempt, Wholesale Pricing, Resellers, Distributors

If you paid us sales tax, but don't think you should have, you must request such a refund within 15 days of the transaction.Â  Sales tax refunds are complicated from the get-go, but they are even worse after we send the money on to the government.

### How Do I Request a Quote?

LabJackÂ has simple transparent pricing, including quantity discounts,Â that is accurately represented through our online store.Â  We do not offer reseller discounts. We do not charge credit card processing fees in most cases.

There is no need to wait for us to generate a quote for you in most cases. We also accept purchase orders from schools, universities and pre-approved customers.

If you REQUIRE a quote or proforma invoice please fill out our contact page with the following details:

• Billing/shipping info
• Desired Payment Method
• LabJack Items and quantity needed
• Shipping carrier and speed
• Delivery date
• Any special handling or order instructions

## LabJack Return Policy

### Return Policy

Everything LabJack sells has a 60-day money-back guarantee and 5-year warranty.Â  Put LabJack to the test. Evaluate our hardware, software, documentation, customer service and support.Â  You can request a full refund if you are not satisfied with a product for any reason. Refund requests are initiated fromÂ the Return Material Authorization (RMA) Page

LabJack does not resell any returned products. Don't worry, we also don'tÂ discardÂ used LabJacks. Returns are earmarked for donations to STEM students, educators and student led engineering teams.Â

### Exchanges

Product exchanges are treated as returns and a new purchase. Â Return your unwanted device for a refund, and place a new order for the device or devices that better suit your needs.Â

### Sales Tax Exempt, Wholesale Pricing, Resellers, Distributors

If you paid us sales tax, but don't think you should have, you must request such a refund within 15 days of the transaction.Â  Sales tax refunds are complicated from the get-go, but they are even worse after we send the money on to the government.

## What is LabJack's Warranty?

### Can LabJack be used for Industrial Applications?

LabJack Devices:
• Can comfortably operate within the industrial temperature range (-40Â°C to 85C)
• Are capable of being mounted via DIN Rail/Snap track
• IntegrateÂ with Voltage Dividers for 24+ Volt signals
• NEMA 3 (or greater) enclosures recommended for any outdoor or indoor applications with dust, debris or in condensing humidity environments
• All LabJack products are covered by our industry leading 5 year warranty
• Have OEMÂ Versions available for custom and embedded applications.Â
• Drawings and CAD Models ProvidedÂ
• LabJack products are very robust, but subject to the influence of user connections.
• LabJack is not liable forÂ any losses, expenses or damages beyond the LabJack device itself.Â  See ourÂ Limitation of LiabilityÂ for more details.

### LabJack Warranty

All LabJack hardware is covered by a 5-year limited warranty, covering products and parts against defects in material or workmanship.Â  We will troubleshoot, repair, or replace with like product to make sure you have a device that is operating to specifications.

LabJack products are very robust, but subject to the influence of user connections. The warranty does not apply if damaging mistakes were made in connecting our device, or if inspection reveals obvious signs of improper use, however we will still make a reasonable attempt to fix such devices for free if possible.

The warranty cannot be honored on discontinued / EOL products if replacements are unavailable and repair is not reasonably possible.

LabJack has taken great care of our customers since we sold our first device in 2001, and your satisfaction is our highest priority.Â  If you suspect a problem with a device contact us atÂ support@labjack.com.

LabJack is not liable forÂ any losses, expenses or damages beyond the LabJack device itself.Â  See ourÂ Limitation of LiabilityÂ for more details.

## How to Start RMA/Repair?

A2.Â My analog input is returning varying values but not the right value.

A3.Â My readings are too noisy.

A4. How do I measure temperature using a thermocouple, RTD, thermistor or other?

A5. My thermocouple readings are wrong.

• Determine if the error is from the cold junction sensor, the A/D conversion, or the signal itself.
• If the cold junction reading is off by a few degrees that error will show up in your calculated thermocouple temperature.
• Remove the thermocouple, and instead jumper the analog input (or both analog inputs for differential) to GND. The thermocouple voltage is now 0.0 volts which is saying both ends of the thermocouple are at the same temperature and thus the thermocouple temperature you calculate will be equal to the cold junction temperature.
• Remove the thermocouple from the system under test and instead just set it next to the LabJackÂ so the thermocouple is measuring air temperature near the LabJack. If the terminals you are connecting to are at air temperature (e.g. CB37 terminals), the expected voltage is 0.0 volts. If the terminals you are connecting to are warmer than air temperature (e.g. T7 terminals), the expected voltage is a negative value dependent on the temperature difference.
• SeeÂ Thermocouple Complications.
• SeeÂ Thermocouple Troubleshooting Tips.

A6. I need to monitor a 4-20 mA current loop signal or measure some other current.

• LabJack analog inputs measure voltage. The LJTick-CurrentShunt is an easy way to convert 4-20 mA to voltage.Â  See theÂ Measuring Current App Note.

A7.Â Should I use differential?

A10. How do I measure pressure?

A11. Can I measure AC or DC?

• Yes, both. When you ask for 1 sample from the LabJackÂ you get the voltage at that moment.Â  If the signal is DC, you expect multiple samples over time to return the same value.Â  If the signal is AC, the samples are taken at different points of the waveform and thus will return different values.
• If you want to acquire the waveform for an AC signal, you simply acquire multiple samples over time, which is often done usingÂ stream mode.Â  Then if wantedÂ you can do math on the waveform to determine parameters such as max/min, RMS, or frequency.
• On T-series devices you can use theÂ AIN-EFÂ systemÂ toÂ acquireÂ multiple samples over time, doÂ some math, and returnÂ various values that describe the multiple samples (RMS,Â Peak-to-Peak,Â Period,Â Average,Â Max/Min).
• See theÂ Measuring 120/240 VAC App Note.

A12. What is the max data rate?

• We have lots of detail for sample rates.Â Â U12,Â U3,Â U6,Â UE9,Â T-Series.
• For stream mode we usually specify the max sample rate.Â For max scan rate divide the max sample rate by number of channels. SampleRate = ScanRate * NumChannels.
• Extended channels on the Mux80 act just like normal channels.Â  The max sample rate of the LabJack is still the same, you just use a bigger number for NumChannels in the above equation.

### RMAs, Repairs, Damaged Hardware

Request Repair/RMA

If we are unable to resolve your issue, and a repair is necessary,Â you will be assigned an RMA# and instructions for prompt and efficient processing.

Please only return the device being repaired. Â Original product packaging or accessories are not necessary, and might not be returned if they are included; e.g, USB cable, Ethernet cable, sensors, accessories etc.Â

Upon approval, you will receive an email with a return number and instructions on how to proceed with your repair. Â Additional emails are automatically sent at the following steps in the repair process:

• Your repair is completed. Â

In certain situations, a complete repair may not be possible due to extensive damage to a device. Â In such cases, we will notify the customer of our findings. Â Depending on circumstances, options can be discussed for either a partial repair or a discount for replacement.Â

LabJack Warranty

Limitation of Liability

### How Do I Get In Contact with LabJack?

We believe written communication (live chat, email) is the best way to provide the best support. We can take a moment to research/test as needed, we can provide links to the extensive documentation on our site, we get a record of everything that was discussed, and we can easily loop in multiple engineers as needed.

Live Chat

Hop on a live chat with the engineers who design and develop our products here in Colorado, USA. We are on chat Monday through Friday from 9-11 am and 2-4 pm, Denver time. Look for the chat bar at the bottom-right of every page at labjack.com

Contact Form

For technical questions or any other kind of question, please fill out our contact page or email us support@labjack.comÂ Submitting this form will not add you to any mailing lists.Â  If you don't hear back within 24 hours, something likely went wrong, so don't hesitate to contact us via another method.

### LabJack Warranty

All LabJack hardware is covered by a 5-year limited warranty, covering products and parts against defects in material or workmanship.Â  We will troubleshoot, repair, or replace with like product to make sure you have a device that is operating to specifications.

LabJack products are very robust, but subject to the influence of user connections. The warranty does not apply if damaging mistakes were made in connecting our device, or if inspection reveals obvious signs of improper use, however we will still make a reasonable attempt to fix such devices for free if possible.

The warranty cannot be honored on discontinued / EOL products if replacements are unavailable and repair is not reasonably possible.

LabJack has taken great care of our customers since we sold our first device in 2001, and your satisfaction is our highest priority.Â  If you suspect a problem with a device contact us atÂ support@labjack.com.

LabJack is not liable forÂ any losses, expenses or damages beyond the LabJack device itself.Â  See ourÂ Limitation of LiabilityÂ for more details.

## Datasheets, Documentation & Tutorials

### LabJack Quickstart Tutorials

LabJack quickstart tutorials show new users how to measure a voltage, change a digital I/O, and set the voltage of an analog output using our free software. These tutorials teaches basic software and device functionality, and is also useful as a quick debugging check to verify that I/O on the device are working properly.

### Where Are LabJack Datasheets?

All LabJack Datasheets, App Notes, Quickstart Tutorials, Software, Firmware, Drivers, Examples and everything else are available under the Support Tab

### Does LabJack Have More Video Tutorials?

LabJack currently has basic Quickstart tutorials thatÂ show users how to measure a voltage, change a digital I/O, and set the voltage of an analog output using our free software. This tutorial teaches basic software and device functionality, and is also useful as a quick debugging check to verify that I/O on the device are working properly.

If you are seeking a more detailed, self paced, step by step introduction taught by an amazing educator with great editing check out our friends at TechExplortions. They offer an affordable Data Acquisition course featuring LabJack hardware and also teach many other hardware and software courses that our customers will enjoy.

We have a blog post that announced the course and explains that there is no affiliation between LabJack and TechExplorationsÂ

## Why LabJack?

### Optional Accessories:

TheÂ CB15Â is a simple screw terminal breakout for the DB15 connector.

The CB37 is a simple screw terminal breakout board for the DB37 connector. It only works with the U6 and T7 devices and can also be paired with the Mux80 for high channel application up to 84 AINs.

The Mux80 is an Analog Input Expansion board for the T7 and U6. Connected directly to the DB37 connector is can allow a single device to read up to 84 AINs.

Â TheÂ RB12Â Relay BoardÂ provides a convenient interface for the LabJack to industry standardÂ relaysÂ to interface a LabJack with high voltages/currents. The RB12 relay board connects to the DB15 connector on the LabJack. Output or inputÂ

TheÂ LJTick-Divider (LJTD)Â signal-conditioning module is designed to divide 2 single-ended higher voltage analog signals down to 0-2.5 volt signals.

TheÂ LJTick-DAC (LJTDAC)Â provides a pair of 14-bit analog outputs with a range of Â±10 volts. Plugs into any digital I/O block, and thus up to 10 of these can be used per device to add 20 analog outputs.

TheÂ LJTick-InAmp (LJTIA)Â signal-conditioning module provides two instrumentation amplifiers ideal for low-level signals such as bridge circuits (e.g. strain gauges) and thermocouples. Each amplifier converts a differential input to single-ended.

TheÂ LJTick-RelayDriver (LJTRD)Â allows 2 digital I/O lines to each control a relay or other moderate load up to 50V/200mA.

TheÂ LJTick-CurrentShunt (LJTCS)Â signal-conditioning module is designed to convert a 4-20 mA current loop input signal into a 0.47-2.36 volt signal.

TheÂ LJTick-Proto (LJTP)Â consists of an 8x8 grid of holes for prototyping custom signal-conditioning modules.

## Legendary Support

• Free lifetime support includes (some) engineering design help.
• The engineers who made the product also respond to your questions.
• Should your LabJack misbehave, we offer free RMA diagnostics & repairs.

Â

## Flexibility

• Software integrates easily. We don't force you into a certain software,Â programming environmentÂ or operating system.
• LabVIEW, C++, MATLAB, Python, Java, .NET, Delphi, Visual Basic, VB6, VBA, and moreÂ examples
• Linux, macOS, Windows
• Add new kinds of sensors on-the-fly. We provide inexpensive signal conditioning modules.
• Control valves, motors, lights, pumps, etc - using one of many digital I/O control options.
• Incorporate LabJack DAQ hardware using ourÂ OEM options.

## Solutions over Show

• Our engineers speak directly.
• Just the information you need to make an informed choice.
• No marketing fluff, no empty promises
• Fair prices, nothing hidden, no extended warranties, no salesmen, no haggling, no pressure.

Â

### What Makes LabJack Different?

LabJack is independently owned and operated small business located just outside Denver Colorado USA. We are singularly focused on offering the best data acquisition hardware. We don't sell software, consulting services or extended warranties.

We treat our customers the way we want to be treated. With respectful, responsive, service and support.Â

### How Do I Get In Contact with LabJack?

We believe written communication (live chat, email) is the best way to provide the best support. We can take a moment to research/test as needed, we can provide links to the extensive documentation on our site, we get a record of everything that was discussed, and we can easily loop in multiple engineers as needed.

Live Chat

Hop on a live chat with the engineers who design and develop our products here in Colorado, USA. We are on chat Monday through Friday from 9-11 am and 2-4 pm, Denver time. Look for the chat bar at the bottom-right of every page at labjack.com

Contact Form

For technical questions or any other kind of question, please fill out our contact page or email us support@labjack.comÂ Submitting this form will not add you to any mailing lists.Â  If you don't hear back within 24 hours, something likely went wrong, so don't hesitate to contact us via another method.

### How Was LabJack Started?

In 2001 LabJack was started by engineers and credit cards in a Colorado garage.Â

Responding to the lack of affordable quality data acquisition hardware, theÂ U12Â was our first product and continues to be sold to this day.Â

Thanks to our amazing customers we have grown beyond our humble beginnings, but our goal has stayed simple: take care of each customer regardless of size. After many years supporting thousands of customers and selling countless LabJacks, we have earned a reputation forÂ Legendary Support.Â Our team has grown, but we are still owned and run by engineers and scientists.

LabJack is proud to partner withÂ Fortune 500 companiesÂ around the world from industries including Aerospace, Defense, Manufacturing/Industrial, Information Technology, Biotechnology, Medical Robotics and many more. Faculty, staff and students from leading Universities around the world trust LabJack devices for precise measurements for experiments, tests and trials. We are proud to have our devices used in national laboratories helping to advance cutting edge research and development.Â Â