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Portable Calibration Baths
Calibrate the Product
69
Alignment is required if the magnitude of any error is greater than 50 % of the
specification. Adjustments are made to the calibration parameters listed in
Table 9. These are accessible in the Bath Calibration menu after the password is
entered.
For each adjustment point:
1. Get the current value of the calibration parameter associated with the
alignment point.
2. Add the error (with sign), which was obtained during the setpoint calibration
at the calibration point, to the calibration parameter.
3. Set the calibration parameter to the new value.
As an example, say the 7109A is set to 50.00 °C but the reference probe measures
49.944 °C. For this example, the calibration parameter TEMP2 is -0.103. If you
change the parameter to -0.159, this shifts the temperature so the reference probe
measures close to 50.00 °C.
After you make adjustments to the calibration parameters, repeat the setpoint
calibration to make sure that the errors at each calibration point are no
greater than 50 % of the specification.
Temperature Stability Calibration
The Product is tested to ensure it performs within the Temperature Stability
specifications. Test temperature stability at least at the two extreme calibration
points listed in Table 12. The temperature stability calibration can be performed
concurrently with the temperature setpoint calibration.
Follow these steps:
1. Insert the reference PRT into the center of the tank with the tip 13 mm above
the bottom of the tank.
2. For each calibration point:
a. Set the setpoint to the calibration point.
b. Wait for the control indicator to show stable.
c. Wait at least 30 minutes for complete settling.
d. Measure the standard deviation of the reference PRT temperature with at
least 20 samples over 15 minutes.
e. Multiply the standard deviation by 2 to get the stability measurement.
f. Check that the result is no greater than the Temperature Stability
specification.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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