89
Calibration of Your Reference Thermometer Readout
Manual Calibration Process
79. Set the output of the voltage source to 75 mV.
80. Query the reading every 2 seconds for 40 readings using the following
command:
MEAS?
Record the data.
7.9.1.3.6 Reference Junction Ohms Range
81. Set the UUT in the RJ_OHMS cal range by sending the following commands
through the serial port:
CAL1:DEV:RANG:SEL RJ_OHMS
82. Connect a 10K Ohm resistor to the calibration cable connected to the UUT.
NOTE: Only connect pins 1and 4 to the 10K Reference resistor. This is a 2 wire
test.
83. Query the reading every 2 seconds for 40 readings using the following
command:
MEAS?
Record the data.
84. For all As Found data, calculate the average and standard deviation for each
set of data. Compare the standard deviation to the specification. If the UUT
does not meet the standard deviation specification, re-take data at the suspect
range(s). If the data is still exceeds the specification, contact an Authorized
Service Center for assistance. Verify the average of each data set is less than the
Accuracy limit listed in the Accuracy Test Settings and Specification tables.
7.9.2 1523/24 Alignment
Prior to performing the alignment, the following UUT conguration and control set-
tings must be set to the values indicated in the 1523/24 Alignment Settings table.
Caution: Failure to do this will cause large errors in the measurement readings
and invalidate the calibration.
Table 31 1523/24 Alignment Settings
Setting Cal Range Value Description
NUM MV 2 MV Range # of cal points
NUM L75_OHMS 2 L75_OHMS Range # of cal points
NUM LO_OHMS 2 LO_OHMS Range # of cal points
NUM MED_OHMS 2 MED_OHMS Range # of cal points
NUM HI_OHMS 2 HI_OHMS Range # of cal points
Ref1, Ref2 MV 0, 75 mV Ref Calibration points
Ref1, Ref2 L75_OHMS 0, 75 L75_OHMS Ref Calibration points
Ref1, Ref2 LO_OHMS 75, 400 LO_OHMS Ref Calibration points
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