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How to Reset the Calibrator
At any time during front panel operation (not remote operation), you can return the
Calibrator to the power-up state by pressing R, except after an error message, which is
cleared by pressing a blue softkey. Pressing the R key does the following:
•
Returns the calibrator to the power-up state: 0 V dc, standby, 330 mV range and all
OUTPUT SETUP menus set to their most recent default values.
Clears the stored values for limits and error mode reference.
How to Zero the Calibrator
Zeroing recalibrates internal circuitry, most notably dc offsets in all ranges of operation.
To meet the specifications in Chapter 1, zeroing is required every seven days, or when
the Calibrator ambient temperature changes by more than 5 °C. The tightest ohms
specifications are maintained with a zero cal every 12 hours within ±1 °C of use. The
Calibrator displays a message when it is time to zero the calibrator. Zeroing is
particularly important when your calibration workload has 1 mΩ or 1 μV resolution, and
when there has been a significant temperature change in the Calibrator work
environment. There are two zeroing functions: total instrument zero (ZERO) and ohms-
only zero (OHMS ZERO).
Complete the following procedure to zero the calibrator. (Note: The Calibrator rear-panel
CALIBRATION switch does not have to be enabled for this procedure.)
1. Turn on the Calibrator and allow a warm-up period of at least 30 minutes.
2. Press the R key.
3. Press the S key, opening the setup menu (below).
4. Press the CAL softkey, opening the calibration information menu (below).
5. Press the CAL softkey, opening the calibration activity menu (below). SCOPE CAL
appears as an option if it is installed.
6. Press the ZERO softkey to totally zero the Calibrator; press the OHMS ZERO
softkey to zero only the ohms function. After the zeroing routine is complete (several
minutes), press the R key to reset the calibrator. For a total zero calibration, a
short circuit capable of passing 20 A needs to be applied between the 20A and AUX
LO terminals.
Front Panel Operation
How to Reset the Calibrator
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