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GENERAL
Prior to performing this calibration procedure the Model 1140A the user should become familiar
with its operation as described in
mentioned in a setup, it is assumed that it is set to the proper setting when the settings of the
Model 1140A are restored to their defaults. This procedure should be followed in the order
presented. Deviation from it may result in an incorrect setting that is not specifically addressed in
this procedure but is addressed when RESET INSTRUMENT TO DEFAULT VALUES is performed.
Note that changes to the output using the ARROW KEYS and the ENCODER occur in real time.
When the KEYPAD is used, the user must press ENTER for the change to occur. Allow a 30 minute
warm-up before performing the calibration procedure.
REQUIRED EQUIPMENT
The equipment listed will ensure a test-accuracy ratio (TAR) of greater than 4:1 for all
measurements. If the user substitutes another instrument, care should be taken to ensure a TAR
of at least 4:1 for all measurements.
•
Digital multimeter (DMM), Hewlett Packard Model 3458A (with Option 02) or
equivalent.
•
Precision Voltage Source, Datron Model 4708 or equivalent.
•
Four-wire Type E thermocouple (24 AWG recommended), calibrated at 26°C
known microvolt error and with bare-wire ends for alloy and copper wires.
provides a procedure to calibrate a thermocouple. The insulation on the thermocouple
wire ends should be stripped back approximately 0.4" (10 mm).
•
Ice-point bath: Hart Model 9101 zero-point dry well or equivalent. A properly made and
maintained distilled-water ice bath can also be used. An uncertainty of 0.01°C is required.
•
Low-thermal cable, Pomona 1756-24 or equivalent.
•
Shorting bar or cable: Pomona Electronics Model 5145 or equivalent.
•
Optional: Cover to shield terminals from air flow, such as Ectron P/N 114-523-01.
TEST REPORTS
The calibration procedure below is designed for use with the test reports given in
this manual. Select the test report corresponding to the time since the unit was last aligned. The
user may want to print a blank copy of that report prior to beginning. If a custom test report is
used instead, some steps may need to be changed.
4 See Footnote
5
in
Appendix
SECTION XI
CALIBRATION PROCEDURE
11
Section IV
of the Instruction Manual. If a parameter is not
B.
11-1
4
with
Appendix B
Appendix A
of
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