Front-Panel Operation
Reset the Calibrator
4
4-7
The softkeys are:
•
ALL
replaces all contents of the EEPROM with factory defaults. This is used by service
personnel after they replace the EEPROM, for example. It is not typically necessary.
•
CAL
replaces all calibration constants with factory defaults but keeps the setup parameters
unchanged. This is also not typically necessary.
•
SETUP
replaces the setup parameters with factory defaults (Table 3-3) but keeps the
calibration unchanged. You do not have to break the calibration seal for this
operation. Remote commands can also change the setup parameters. (See these
commands in Chapter 6: SRQSTR, SPLSTR, *PUD, SP_SET, UUT_SET,
TEMP_STD, DATEFMT, RTD_TYPE_D, TC_TYPE_D, LIMIT.)
Reset the Calibrator
When you use front panel-operation (not remote operation), you can put the Calibrator to
the power-up condition with
, except after an error message, which is cleared by a
push of the blue softkey.
Push
to:
•
Put the Calibrator into the power-up condition: 0 V dc, standby, 330 mV range and
all OUTPUT SETUP menus set to their most recent default values.
•
Erases the stored values for limits and error mode reference.
Zero the Calibrator
When you zero the Calibrator, the Calibrator recalibrates internal circuitry, most notably
dc offsets in all ranges of operation. Zero the Calibrator each seven days to make sure the
Calibrator outputs are not more or less than the limits of its specification, or when the
Calibrator ambient temperature changes by more than 5
°
C. The tightest ohms
specifications are kept by a zero calibration each 12 hours within
±
1
°
C of use. The
Calibrator shows a message when it is necessary to zero the Calibrator. To zero the
Calibrator is very important when your calibration workload has 1 m
Ω
or 1
μ
V
resolution, and when there has been a significant temperature change in the Calibrator
work environment. There are two functions that zero the Calibrator: total instrument zero
(ZERO) and ohms-only zero (OHMS ZERO).
Complete these procedures to zero the Calibrator.
Summary of Contents for 5502A
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