6109A/7109A
Operators Manual
68
Temperature Setpoint Calibration
The Product is calibrated to ensure it performs within the Temperature Source
specifications. If necessary, adjustments are made to return the Product to
specification or to optimize performance.
Table 9 lists the equipment required to calibrate the temperature setpoint
accuracy. The combined expanded (k =2) uncertainty of the calibration
equipment must be no more than 0.025 °C.
Table 9. Equipment for Temperature Setpoint Calibration
Equipment Specifications Suggested Model
Reference PRT 0.008 °C at 0 °C Fluke Calibration 5628
PRT readout 20 ppm Fluke Calibration 1560/2560
Table 10 lists the calibration points for each model. Calibration points marked
with an asterisk are also alignment points.
Table 10. Calibration Points for Temperature Setpoint Calibration
Point number 7109A Temperature 6109A Temperature
Calibration
Parameter
1 * -25 °C 35 °C TEMP1
2 0 °C 100 °C (none)
3 * 50 °C 150 °C TEMP2
4 100 °C 200 °C (none)
5 * 140 °C 250 °C TEMP3
To calibrate the temperature setpoint:
1. Place the reference PRT in the center of the tank with the tip 13 mm above
the bottom.
2. Set the Stability Window to 0.05 °C, see Operation.
3. 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 average temperature of the reference PRT with at least 20
samples over 15 minutes.
e. Calculate the temperature setpoint error as the difference between the
average temperature and the calibration point.
f. Check that the error is no greater than the Temperature Source Accuracy
specification.
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