Calibration Service with Cert U6/UE9/T7 | LabJack
 

Calibration Service with Cert U6/UE9/T7

CAL_SERVICE

Choose a model below

Calibration Service with Cert U6/UE9/T7
70.00

Calibration Service with Cert U6/UE9/T7

$70.00
Quantity Discounts:
1+ = $70.00 per unit
Stock Status: 
In Stock

NIST traceable calibration of the U6-Pro (and all U6 variants), T7-Pro (and all T7 variants), or UE9-Pro. Industry standard calibration interval is once per year. Includes a calibration certificate.

All devices are calibrated at the factory, but there are a few reasons for purchasing this service:

  • A certificate is needed.  Due to the nature of our production process, it is not cost effective to generate a certificate for the original factory calibration, so one is not included with a normal purchase.
  • Recalibration is needed.  Many organizations or processes that require a calibration certificate also require that devices be recalibrated or verified at some interval.  1 year is the industry standard interval.
  • A "fresh" calibration is desired.  Since we try to keep substantial stock on hand to provide immediate shipment of all orders, it is possible that the factory calibration could happen some months before a device ships.

 

How To Order

If ordered at the same time as new devices the service will be done on those devices, otherwise follow these steps:

1.  Purchase the desired quantity and note the order number.

2.  Ship the device (only the device itself ... no cables, power supply, etc.) to LabJack at the address shown anywhere on our site.  Reference the calibration service order number from step #1.

3.  Typical lead time at our facility is about 1 week once we receive your device.  The calibration process can be expedited on request to meet demanding schedules.

 

Is My Calibration Good?

A quick way to check calibration is to take readings from internal ground channel AIN15 or any channel jumpered to GND.  This is the midpoint of the AIN system, so if the device has changed and is out of calibration it will likely show up at this convenient voltage.  Use Kipling or LJControlPanel to see the readings as you control Range and Resolution Index.  The accuracy specifications are the same for the U6 and T7, and the -Pro versions of either:

https://labjack.com/support/datasheets/t-series/appendix-a-3

  • You only need to check one channel as they are all multiplexed to the same AIN circuitry.
  • You do want to check both converters on a -Pro, so ResIndex 8 and 9 on a U6-Pro or T7-Pro.
  • This should be done with the device stabilized at room temperature.
  • To avoid confusion, this should be done with no other connections except comm/power.

If that ground test shows errors within specifications, you could then proceed to check some other voltages.  Ideally a voltage around 10% and 90% of the range you are testing (e.g. -8 and +8 volts for the ±10 volt range), but a couple voltages from DAC0 (e.g. +2 volts and +4 volts) are fine also.  Use any stable source to provide the test voltage, use a reference voltmeter to measure the actual voltage (must be substantially more accurate than the LabJack specs), and then use Kipling or LJControlPanel to note the measured voltage.  If all errors are within spec, you (or your calibration lab) can issue a new calibration certificate based on this verification of the current calibration.

Is Calibration Important?

Calibration of an entire system is usually important, but often the specific calibration of the LabJack analog I/O is not needed.  There are usually other errors that are part of the measurement so the best practice is to do a single calibration of the entire signal chain in-situ, rather than calibrating each part separately.  For example, here are some (but not all) error sources that combine when doing a quarter bridge measurement with a strain gauge:

  • Accuracy of the excitation voltage (output is proportional to excitation).
  • Accuracy specification of the strain gauge.
  • Accuracy of the bridge completion resistors.
  • Accuracy of the math relating strain to voltage.
  • Errors due to resistance of connections and wires.
  • Errors due to mounting of the strain gauge.
  • Accuracy of the LabJack A/D conversion.

Say this strain gauge measurement is to measure force applied to a beam.  A great way to handle this is to apply 2 known forces (0 pounds is one easy force to use), note the 2 associated digitized voltages, and then come up with a slope & offset that relate volts to force and apply this in software.

What about the U3 and T4?

The U3 and T4 are calibrated at our facilities to within the specs found in their datasheets, but we do not offer a NIST traceable calibration service for these devices at this time.  A couple reasons in addition to some of the information above:

  • The cost of the calibration service compared to the cost of the device is such that it would not make sense for most customers.
  • The current high-efficiency process used to manufacture and calibrate these lower cost devices does not lend itself to cost efficient generation of NIST traceable certificates.

 

Accessories

There are no accessories for this product.