- Datasheets
- Accessories
- CB15
- CB25
- CB37 V1.2
- CB37 V2.1
- EB37
- EI-1022
- EI-1034
- EI-1040
- EI-1050
- IDCA-10
- LJTick-CurrentShunt
- LJTick-DAC
- LJTick-DAC Testing Utility
- LJTick-DigitalOut5V
- LJTick-Divider
- LJTick-InAmp
- LJTick-InBuff
- LJTick-LVDigitalIO
- LJTick-OutBuff
- LJTick-Proto
- LJTick-RelayDriver
- LJTick-Resistance
- LJTick-VRef
- Mux80 AIN Expansion Board
- PS12DC
- RB12
- RB16
- T-Series Datasheet
- Preface: Warranty, Liability, Compliance
- 1.0 Device Overview
- 2.0 Installation
- 3.0 Communication
- 4.0 Hardware Overview
- 5.0 USB
- 6.0 Ethernet
- 7.0 WiFi (T7-Pro only)
- 8.0 LEDs
- 9.0 VS, Power Supply
- 10.0 SGND and GND
- 11.0 SPC
- 12.0 200uA and 10uA (T7 Only)
- 13.0 Digital I/O
- 13.1 Flexible I/O (T4 Only)
- 13.2 DIO Extended Features
- 13.2.1 EF Clock Source
- 13.2.2 PWM Out
- 13.2.3 PWM Out with Phase
- 13.2.4 Pulse Out
- 13.2.5 Frequency In
- 13.2.6 Pulse Width In
- 13.2.7 Line-to-Line In
- 13.2.8 High-Speed Counter
- 13.2.9 Interrupt Counter
- 13.2.10 Interrupt Counter with Debounce
- 13.2.11 Quadrature In
- 13.2.12 Interrupt Frequency In
- 13.2.13 Conditional Reset
- 13.3 I2C
- 13.4 SPI
- 13.5 SBUS
- 13.6 1-Wire
- 13.7 Asynchronous Serial
- 14.0 Analog Inputs
- 15.0 DAC
- 16.0 DB37 (T7 Only)
- 17.0 DB15
- 18.0 Internal Temp Sensor
- 19.0 RTC (T7 Only)
- 20.0 Internal Flash
- 21.0 SD Card (T7 Only)
- 22.0 OEM Versions
- 23.0 Watchdog
- 24.0 IO Config, _DEFAULT
- 25.0 Lua Scripting
- Appendix A - Specifications
- Appendix B - Drawings and CAD Models
- Appendix C - Firmware Revision History
- Appendix D - Packaging Information
- Appendix E - Software Options
- U3 Datasheet
- Preface
- 1 - Installation
- 2 - Hardware Description
- 2.1 - USB
- 2.2 - Status LED
- 2.3 - GND and SGND
- 2.4 - VS
- 2.5 - Flexible I/O (FIO/EIO)
- 2.6 - AIN
- 2.6.1 - Channel Numbers
- 2.6.2 - Converting Binary Readings to Voltages
- 2.6.3 - Typical Analog Input Connections
- 2.6.3.1 - Signal from the LabJack
- 2.6.3.2 - Unpowered Isolated Signal
- 2.6.3.3 - Signal Powered By the LabJack
- 2.6.3.4 - Signal Powered Externally
- 2.6.3.5 - Amplifying Small Signal Voltages
- 2.6.3.6 - Signal Voltages Beyond 0-2.44 Volts (and Resistance Measurement)
- 2.6.3.7 - Measuring Current (Including 4-20 mA) with a Resistive Shunt
- 2.6.3.8 - Floating/Unconnected Inputs
- 2.6.3.9 - Signal Voltages Near Ground
- 2.6.4 - Internal Temperature Sensor
- 2.7 - DAC
- 2.8 - Digital I/O
- 2.9 - Timers/Counters
- 2.9.1 - Timer Mode Descriptions
- 2.9.1.1 - PWM Output (16-Bit, Mode 0)
- 2.9.1.2 - PWM Output (8-Bit, Mode 1)
- 2.9.1.3 - Period Measurement (32-Bit, Modes 2 & 3)
- 2.9.1.4 - Duty Cycle Measurement (Mode 4)
- 2.9.1.5 - Firmware Counter Input (Mode 5)
- 2.9.1.6 - Firmware Counter Input With Debounce (Mode 6)
- 2.9.1.7 - Frequency Output (Mode 7)
- 2.9.1.8 - Quadrature Input (Mode 8)
- 2.9.1.9 - Timer Stop Input (Mode 9)
- 2.9.1.10 - System Timer Low/High Read (Modes 10 & 11)
- 2.9.1.11 - Period Measurement (16-Bit, Modes 12 & 13)
- 2.9.1.12 - Line-to-Line Measurement (Mode 14)
- 2.9.2 - Timer Operation/Performance Notes
- 2.9.1 - Timer Mode Descriptions
- 2.10 - SPC (… and SCL/SDA/SCA)
- 2.11 - DB15
- 2.12 - U3-OEM
- 2.13 - Hardware Revision Notes
- 3 - Operation
- 4 - LabJackUD High-Level Driver
- 4.1 - Overview
- 4.2 - Function Reference
- 4.2.1 - ListAll()
- 4.2.2 - OpenLabJack()
- 4.2.3 - eGet() and ePut()
- 4.2.4 - eAddGoGet()
- 4.2.5 - AddRequest()
- 4.2.6 - Go()
- 4.2.7 - GoOne()
- 4.2.8 - GetResult()
- 4.2.9 - GetFirstResult() and GetNextResult()
- 4.2.10 - DoubleToStringAddress()
- 4.2.11 - StringToDoubleAddress()
- 4.2.12 - StringToConstant()
- 4.2.13 - ErrorToString()
- 4.2.14 - GetDriverVersion()
- 4.2.15 - TCVoltsToTemp()
- 4.2.16 - ResetLabJack()
- 4.2.17 - eAIN()
- 4.2.18 - eDAC()
- 4.2.19 - eDI()
- 4.2.20 - eDO()
- 4.2.21 - eTCConfig()
- 4.2.22 - eTCValues()
- 4.3 - Example Pseudocode
- 4.3.1 - Open
- 4.3.2 - Configuration
- 4.3.3 - Analog Inputs
- 4.3.4 - Analog Outputs
- 4.3.5 - Digital I/O
- 4.3.6 - Timers & Counters
- 4.3.7 - Stream Mode
- 4.3.8 - Raw Output/Input
- 4.3.9 - Easy Functions
- 4.3.10 - SPI Serial Communication
- 4.3.11 - I²C Serial Communication
- 4.3.12 - Asynchronous Serial Communication
- 4.3.13 - Watchdog Timer
- 4.3.14 - Miscellaneous
- 4.4 - Errorcodes
- 5 - Low-level Function Reference
- 5.1 - General Protocol
- 5.2 - Low-Level Functions
- 5.2.1 - Bad Checksum
- 5.2.2 - ConfigU3
- 5.2.3 - ConfigIO
- 5.2.4 - ConfigTimerClock
- 5.2.5 - Feedback
- 5.2.5.1 - AIN: IOType = 1
- 5.2.5.2 - WaitShort: IOType=5
- 5.2.5.3 - WaitLong: IOType=6
- 5.2.5.4 - LED: IOType=9
- 5.2.5.5 - BitStateRead: IOType=10
- 5.2.5.6 - BitStateWrite: IOType=11
- 5.2.5.7 - BitDirRead: IOType=12
- 5.2.5.8 - BitDirWrite: IOType=13
- 5.2.5.9 - PortStateRead: IOType=26
- 5.2.5.10 - PortStateWrite: IOType=27
- 5.2.5.11 - PortDirRead: IOType=28
- 5.2.5.12 - PortDirWrite: IOType=29
- 5.2.5.13 - DAC# (8-bit): IOType=34,35
- 5.2.5.14 - DAC# (16-bit): IOType=38,39
- 5.2.5.15 - Timer#: IOType=42,44
- 5.2.5.16 - Timer#Config: IOType=43,45
- 5.2.5.17 - Counter#: IOType=54,55
- 5.2.5.18 - Buzzer: IOType=63
- 5.2.6 - ReadMem (ReadCal)
- 5.2.7 - WriteMem (WriteCal)
- 5.2.8 - EraseMem (EraseCal)
- 5.2.9 - Reset
- 5.2.10 - StreamConfig
- 5.2.11 - StreamStart
- 5.2.12 - StreamData
- 5.2.13 - StreamStop
- 5.2.14 - Watchdog
- 5.2.15 - SPI
- 5.2.16 - AsynchConfig
- 5.2.17 - AsynchTX
- 5.2.18 - AsynchRX
- 5.2.19 - I²C
- 5.2.20 - SHT1X
- 5.2.21 - SetDefaults (SetToFactoryDefaults)
- 5.2.22 - ReadDefaults (ReadCurrent)
- 5.2.23 - 1-Wire
- 5.3 - Errorcodes
- 5.4 - Calibration Constants
- Appendix A - Specifications
- Appendix B - Enclosure and PCB Drawings
- U3 Firmware Revision History
- U6 Datasheet
- Preface: Warranty, Liability, Compliance
- 1 - Installation
- 2 - Hardware Description
- 2.1 - USB
- 2.2 - Power and Status LED
- 2.3 - GND and SGND
- 2.4 - VS
- 2.5 - 10UA and 200UA
- 2.6 - AIN
- 2.6.1 - Channel Numbers
- 2.6.2 - Converting Binary Readings to Voltages
- 2.6.3 - Typical Analog Input Connections
- 2.6.3.1 - Signal from the LabJack
- 2.6.3.2 - Unpowered Isolated Signal
- 2.6.3.3 - Signal Powered By the LabJack
- 2.6.3.4 - Signal Powered Externally
- 2.6.3.5 - Amplifying Small Signal Voltages
- 2.6.3.6 - Signal Voltages Beyond ±10 Volts (and Resistance Measurement)
- 2.6.3.7 - Measuring Current (Including 4-20 mA) with a Resistive Shunt
- 2.6.3.8 - Floating/Unconnected Inputs
- 2.6.4 - Internal Temperature Sensor
- 2.6.5 - Signal Range
- 2.7 - DAC
- 2.8 - Digital I/O
- 2.9 - Timers/Counters
- 2.9.1 - Timer Mode Descriptions
- 2.9.1.1 - PWM Output (16-Bit, Mode 0)
- 2.9.1.2 - PWM Output (8-Bit, Mode 1)
- 2.9.1.3 - Period Measurement (32-Bit, Modes 2 & 3)
- 2.9.1.4 - Duty Cycle Measurement (Mode 4)
- 2.9.1.5 - Firmware Counter Input (Mode 5)
- 2.9.1.6 - Firmware Counter Input With Debounce (Mode 6)
- 2.9.1.7 - Frequency Output (Mode 7)
- 2.9.1.8 - Quadrature Input (Mode 8)
- 2.9.1.9 - Timer Stop Input (Mode 9)
- 2.9.1.10 - System Timer Low/High Read (Modes 10 & 11)
- 2.9.1.11 - Period Measurement (16-Bit, Modes 12 & 13)
- 2.9.1.12 - Line-to-Line Measurement (Mode 14)
- 2.9.2 - Timer Operation/Performance Notes
- 2.9.1 - Timer Mode Descriptions
- 2.10 - SPC (or VSPC)
- 2.11 - DB37
- 2.12 - DB15
- 2.13 - OEM Connector Options
- 3 - Operation
- 4 - LabJackUD High-Level Driver
- 4.1 - Overview
- 4.2 - Function Reference
- 4.2.1 - ListAll()
- 4.2.2 - OpenLabJack()
- 4.2.3 - eGet() and ePut()
- 4.2.4 - eAddGoGet()
- 4.2.5 - AddRequest()
- 4.2.6 - Go()
- 4.2.7 - GoOne()
- 4.2.8 - GetResult()
- 4.2.9 - GetFirstResult() and GetNextResult()
- 4.2.10 - DoubleToStringAddress()
- 4.2.11 - StringToDoubleAddress()
- 4.2.12 - StringToConstant()
- 4.2.13 - ErrorToString()
- 4.2.14 - GetDriverVersion()
- 4.2.15 - TCVoltsToTemp()
- 4.2.16 - ResetLabJack()
- 4.2.17 - eAIN()
- 4.2.18 - eDAC()
- 4.2.19 - eDI()
- 4.2.20 - eDO()
- 4.2.21 - eTCConfig()
- 4.2.22 - eTCValues()
- 4.3 - Example Pseudocode
- 4.3.1 - Open
- 4.3.2 - Configuration
- 4.3.3 - Analog Inputs
- 4.3.4 - Analog Outputs
- 4.3.5 - Digital I/O
- 4.3.6 - Timers & Counters
- 4.3.7 - Stream Mode
- 4.3.8 - Raw Output/Input
- 4.3.9 - Easy Functions
- 4.3.10 - SPI Serial Communication
- 4.3.11 - I²C Serial Communication
- 4.3.12 - Asynchronous Serial Communication
- 4.3.13 - Watchdog Timer
- 4.3.14 - Miscellaneous
- 4.4 - Errorcodes
- 5 - Low-level Function Reference
- 5.1 - General Protocol
- 5.2 - Low-Level Functions
- 5.2.1 - Bad Checksum
- 5.2.2 - ConfigU6
- 5.2.3 - ConfigIO
- 5.2.4 - ConfigTimerClock
- 5.2.5 - Feedback
- 5.2.5.1 - AIN: IOType = 1
- 5.2.5.2 - AIN24: IOType = 2
- 5.2.5.3 - AIN24AR: IOType = 3
- 5.2.5.4 - WaitShort: IOType=5
- 5.2.5.5 - WaitLong: IOType=6
- 5.2.5.6 - LED: IOType=9
- 5.2.5.7 - BitStateRead: IOType=10
- 5.2.5.8 - BitStateWrite: IOType=11
- 5.2.5.9 - BitDirRead: IOType=12
- 5.2.5.10 - BitDirWrite: IOType=13
- 5.2.5.11 - PortStateRead: IOType=26
- 5.2.5.12 - PortStateWrite: IOType=27
- 5.2.5.13 - PortDirRead: IOType=28
- 5.2.5.14 - PortDirWrite: IOType=29
- 5.2.5.15 - DAC# (8-bit): IOType=34,25
- 5.2.5.16 - DAC# (16-bit): IOType=38,39
- 5.2.5.17 - Timer#: IOType=42,44,46,48
- 5.2.5.18 - Timer#Config: IOType = 43, 45, 47, 49
- 5.2.5.19 - Counter#: IOType = 54, 55
- 5.2.6 - ReadMem (ReadCal)
- 5.2.7 - WriteMem (WriteCal)
- 5.2.8 - EraseMem (EraseCal)
- 5.2.9 - SetDefaults (SetToFactoryDefaults)
- 5.2.10 - ReadDefaults (ReadCurrent)
- 5.2.11 - Reset
- 5.2.12 - StreamConfig
- 5.2.13 - StreamStart
- 5.2.14 - StreamData
- 5.2.15 - StreamStop
- 5.2.16 - Watchdog
- 5.2.17 - SPI
- 5.2.18 - AsynchConfig
- 5.2.19 - AsynchTX
- 5.2.20 - AsynchRX
- 5.2.21 - I²C
- 5.2.22 - SHT1X
- 5.2.23 - 1-Wire
- 5.2.24 - StreamAddChannels
- 5.3 - Errorcodes
- 5.4 - Calibration Constants
- Appendix A - Specifications
- Appendix B - Noise and Resolution Tables
- Appendix C - Enclosure and PCB Drawings
- U6 Firmware Revision History
- Digit Datasheet (Discontinued)
- UE9 Datasheet
- Preface
- 1 - Installation
- 2 - Hardware Description
- 2.1 - USB
- 2.2 - Ethernet
- 2.3 - Vext (Screw Terminals and Power Jack)
- 2.4 - Comm and Control LEDs
- 2.5 - GND and SGND
- 2.6 - VS
- 2.7 - AIN
- 2.7.1 - Channel Numbers
- 2.7.2 - Converting Binary Readings to Voltages
- 2.7.3 - Typical Analog Input Connections
- 2.7.3.1 - Signal from the LabJack
- 2.7.3.2 - Unpowered Isolated Signal
- 2.7.3.3 - Signal Powered by the LabJack
- 2.7.3.4 - Signal Powered Externally
- 2.7.3.5 - Amplifying Small Signal Voltages
- 2.7.3.6 - Signal Voltages Beyond ±5 Volts (and Resistance Measurement)
- 2.7.3.7 - Measuring Current (Including 4-20 mA) with a Resistive Shunt
- 2.7.3.8 - Floating/Unconnected Inputs
- 2.7.4 - Internal Temperature Sensor
- 2.8 - DAC
- 2.9 - Digital I/O
- 2.10 - Timers/Counters
- 2.10.1 - Timer Mode Descriptions
- 2.10.1.1 - PWM Output (16-Bit, Mode 0)
- 2.10.1.2 - PWM Output (8-Bit, Mode 1)
- 2.10.1.3 - Period Measurement (32-Bit, Modes 2 & 3)
- 2.10.1.4 - Duty Cycle Measurement (Mode 4)
- 2.10.1.5 - Firmware Counter Input (Mode 5)
- 2.10.1.6 - Firmware Counter Input With Debounce (Mode 6)
- 2.10.1.7 - Frequency Output (Mode 7)
- 2.10.1.8 - Quadrature Input (Mode 8)
- 2.10.1.9 - Timer Stop Input (Mode 9)
- 2.10.1.10 - System Timer Low/High Read (Modes 10 & 11)
- 2.10.1.11 - Period Measurement (16-Bit, Modes 12 & 13)
- 2.10.2 - Timer Operation/Performance Notes
- 2.10.1 - Timer Mode Descriptions
- 2.11 - SCL and SDA (or SCA)
- 2.12 - DB37
- 2.13 - DB15
- 2.14 - OEM Connector Options
- 3 - Operation
- 4 - LabJackUD High-Level Driver
- 4.1 - Overview
- 4.2 - Function Reference
- 4.2.1 - ListAll()
- 4.2.2 - OpenLabJack()
- 4.2.3 - eGet() and ePut()
- 4.2.4 - eAddGoGet()
- 4.2.5 - AddRequest()
- 4.2.6 - Go()
- 4.2.7 - GoOne()
- 4.2.8 - GetResult()
- 4.2.9 - GetFirstResult() and GetNextResult()
- 4.2.10 - DoubleToStringAddress()
- 4.2.11 - StringToDoubleAddress()
- 4.2.12 - StringToConstant()
- 4.2.13 - ErrorToString()
- 4.2.14 - GetDriverVersion()
- 4.2.15 - TCVoltsToTemp()
- 4.2.16 - ResetLabJack()
- 4.2.17 - eAIN()
- 4.2.18 - eDAC()
- 4.2.19 - eDI()
- 4.2.20 - eDO()
- 4.2.21 - eTCConfig()
- 4.2.22 - eTCValues()
- 4.3 - Example Pseudocode
- 4.3.1 - Open
- 4.3.2 - Configuration
- 4.3.3 - Analog Inputs
- 4.3.4 - Analog Outputs
- 4.3.5 - Digital I/O
- 4.3.6 - Timers & Counters
- 4.3.7 - Stream Mode
- 4.3.8 - Raw Output/Input
- 4.3.9 - Easy Functions
- 4.3.10 - SPI Serial Communication
- 4.3.11 - I²C Serial Communication
- 4.3.12 - Asynchronous Serial Communication
- 4.3.13 - Watchdog Timer
- 4.3.14 - Miscellaneous
- 4.4 - Errorcodes
- 5 - Low-level Function Reference
- 5.1 - General Protocol
- 5.2 - Comm Functions
- 5.3 - Control Functions
- 5.3.1 - BadChecksum
- 5.3.2 - ControlConfig
- 5.3.3 - Feedback (and FeedbackAlt)
- 5.3.4 - SingleIO
- 5.3.5 - TimerCounter
- 5.3.6 - StreamConfig
- 5.3.7 - StreamStart
- 5.3.8 - StreamData
- 5.3.9 - StreamStop
- 5.3.10 - ReadMem
- 5.3.11 - WriteMem
- 5.3.12 - EraseMem
- 5.3.13.1 - WatchdogConfig
- 5.3.13.2 - WatchdogRead
- 5.3.13.3 - Extended WatchdogConfig
- 5.3.13.4 - WatchdogClear
- 5.3.15 - Reset
- 5.3.16 - SPI
- 5.3.17 - AsynchConfig
- 5.3.18 - AsynchTX
- 5.3.19 - AsynchRX
- 5.3.20 - I²C
- 5.3.21 - SHT1X
- 5.3.22 - StreamDAC
- 5.3.23 - SetDefaults (SetToFactoryDefaults)
- 5.3.24 - ReadDefaults (ReadCurrent)
- 5.3.25 - 1-Wire
- 5.4 - Low-Level Errorcodes
- 5.5 - Modbus
- 5.6 - Calibration Constants
- 6 - Low-level Native Examples
- Appendix A - Specifications
- Appendix B - Noise and Resolution Tables
- Appendix C - Enclosure and PCB Drawings
- UE9 Firmware Revision History
- U12 Datasheet
- 1 - Installation
- 2 - Hardware Description
- 3 - Example Applications
- 4 - Programming Reference
- 4.1 - EAnalogIn
- 4.2 - EAnalogOut
- 4.3 - ECount
- 4.4 - EDigitalIn
- 4.5 - EDigitalOut
- 4.6 - AISample
- 4.7 - AIBurst
- 4.8 - AIStreamStart
- 4.9 - AIStreamRead
- 4.10 - AIStreamClear
- 4.11 - AOUpdate
- 4.12 - AsynchConfig
- 4.13 - Asynch
- 4.14 - BitsToVolts
- 4.15 - VoltsToBits
- 4.16 - Counter
- 4.17 - DigitalIO
- 4.18 - GetDriverVersion
- 4.19 - GetErrorString
- 4.20 - GetFirmwareVersion
- 4.21 - GetWinVersion
- 4.22 - ListAll
- 4.23 - LocalID
- 4.24 - NoThread
- 4.25 - PulseOut
- 4.26 - PulseOutStart
- 4.27 - PulseOutFinish
- 4.28 - PulseOutCalc
- 4.29 - ReEnum
- 4.30 - Reset (or ResetLJ)
- 4.31 - SHT1X
- 4.32 - SHTComm
- 4.33 - SHTCRC
- 4.34 - Synch
- 4.35 - Watchdog
- 4.36 - ReadMem
- 4.37 - WriteMem
- 4.38 - BuildOptionBits (ActiveX only)
- 4.39 - FourPack (ActiveX only)
- 4.40 - Description of Errorcodes
- 5 - Low-Level Function Reference
- Appendix A - Specifications
- Appendix B - Dimensions
- Appendix C - U12 Hardware Troubleshooting
- Appendix D - Maximum Data Rates for the LabJack U12
- Accessories
8 comments
The burst mode of the U12 can
The burst mode of the U12 can be externally triggered. This should be mentioned in the software description for AIBurst.
I see it mentioned in the
I see it mentioned in the software description above, and in the programming reference (Section 4.7) it is documented in the parameter descriptions. Let us know if you need more information on this page or 4.7.
How many ADCs are in the U12
How many ADCs are in the U12 device? I looks like only one with MUX.
Do I understand correctly that in the Burst regime when 2 or 4 channels are sampled it does not scan the channels simultaneously - and it switches among the channels instead (time multiplex among the input) so that the corresponding samples of each channel are acquired with delay of 1/SampleRate? I haven't seen it written explicitly in the datasheet
Thank you for the answer
michal
That is correct for the U12.
That is correct for the U12. See the description of "Channel-To-Channel Delay" on the U12 data rates page. Newer devices (U3/U6/UE9) are also multiplexed, but the channels within each scan are sampled as fast as possible, not necessarily 1/SampleRate.
Is the actual AD-Conversion
Is the actual AD-Conversion Time a function of the sample rate?
If I measure a square wave (e.g. from -5V to 5 V) using a small sample rate, I start seeing in between values (e.g. 4V) a lot. Using higher sample rates I don't see the in between values.
This is strange behavior, can
This is strange behavior, can you provide any additional details? It may also be helpful to email us at [email protected] and attach your code, so we can try to reproduce it on our end. The sampling rate should not influence the voltages, unless the source impedance was very high. (pH sensors have very high source impedance, but most other kinds of analog sensors should not have this issue). Also, if the source impedance was very high, I'd expect the voltages to be wrong at the higher sample rates, and good at lower sample rates, not the other way around.
Good morning, I have have
Good morning,
I have have torque sensor with 1mV/V, 10 V supply voltage and I have to use Labjack U12 (analog Input and USB Output). The maximum voltage from the sensor will be 10 mV. As far as I understand it is necessary to use an amplifier to get the up to 10 volts for measuring. To find an amplifier to get the right voltage range is not a problem, but what's about the amperage / current? Your U12 User's Guide says the input current with +10 volts is 70.1 µA. Now I am a little bit confused because the amplifiers I found range from 2.2 to 20 mA. Would this work anyway? And which restriction I have to care about? I do not want to harm the U12. (Any other tips on this case are welcome)
Thanks
So you want to pre-amplify an
So you want to pre-amplify an analog signal going into the LabJack U12? We sell the EI1040 instrumentation amplifier for this purpose, it will output with a gain of 1, 10, 100 or 1000 (depending on jumper setting).
It's also possible to make your own amplifier circuit, but you will have to provide your own stable rail voltages(±10V typ), and also think about how noise will factor in. For instance, if your noise is ±2mV, and your signal is 10mV, the amplification stage will simply amplify the noise as well as the signal, so a gain of 10 would leave you with 20mV of noise on a 100mV signal. The instrumentation amplifiers that output between 2.2 and 20mA will not harm the U12. Basically the U12 only needs a little bit of current to get the reading, and those amplifiers can output current in abundance of what's required, such that you only use a little bit of what the amp is capable of, but that's okay.