Service manual

Calibration and Verification
Calibration Menus 3
3-5
This menu defines four menu keys:
Auto Indicates to the user that the calibration point is automatically set according
to the amplitude (and frequency in ACV) of the signal detected. Auto is the
default selection on entry to the
CALIBRATION menu. Refer to the tables
appearing later in this chapter for the calibration points for the selected range.
An indication of the use of the SAMPLE key is also displayed
Set The Set feature is available in all functions, allowing the user to enter the true
value of the calibration standard where it differs from nominal calibration
point value. Pressing Set displays the
SET VALUE menu except in ACV Spot
Frequency mode, when the
SPOT CAL menu is displayed. Spot Frequency
calibration reduces flatness errors within ± 10 % of the spot frequency. Set is
not available for DCV, DCI, and Resistance range zero calibrations.
Special Special Cal is indicated on the main display. The SPCL menu is displayed
which allows pre-calibration of the Multimeter, calibration of the frequency
counter, and entry to other calibration utilities.
Quit Exits from the CALIBRATION menu via the CALIBRATION DUE ? menu,
where the recommended next calibration date can be entered, before finally
quitting the calibration mode.
SET VALUE Menu
This menu is obtained by pressing the Set key in the
CALIBRATION menu on all
functions except ACV Spot Frequency.
adj139f.eps
SET VALUE Menu
When this menu appears, it shows the nominal calibration point value, allowing the user
to enter the true output value of the calibration standard at the point to be calibrated. The
keyboard is activated, locking out all other keys. The Set value is entered in exponential
format expressed in Volts, Amps, or Ohms, and must be above 20 % of range (40 % on
the 1000V DCV and ACV ranges). The
SAMPLE key has no effect until the Set value is
stored by pressing the Enter key.
The Multimeter always chooses the most-recently stored Set value when calibrating.
Set
is not available for DCV, DCI, and Resistance range zero calibrations.
W Caution
Enter: The new value is stored and the keyboard is de-
activated. The set value remains on the dot-matrix display for
comparison with the reading on the main display after the
SAMPLE key has been pressed.
Quit: Reverts to the CALIBRATION menu, deleting the set
value from store.
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