Service manual

8508A
Service Manual
3-4
Non-Nominal Values
The
Set facility allows the user to set the calibration target to the value of the calibration
source available. This facility is most useful when the user’s calibration source is not
available at the nominal values specified, or when the user has knowledge of the actual
output of the calibration source at the required points. In these cases, the use of the
Set
facility
with a table of errors for the calibration source is recommended and will improve
the accuracy of the Multimeter’s calibration.
Enabling Access to Calibration Mode
The setting of a Calibration-switch on the rear panel enables or restricts access to the
calibration mode. Setting the switch to
ENABLE allows access to the calibration mode via
the front panel
CAL key and the CALIBRATION menu, and also enables the remote IEEE
488 interface calibration commands. Setting the switch to DISABLE and applying an
integrity seal or calibration sticker to cover the Calibration switch is a convenient way to
ensure the security of calibration and to prevent unauthorized access to the switch.
Calibration Menus
Accessing the Calibration Menus and Calibration Mode
Pressing the
CAL key on the front panel causes the Multimeter to respond as follows:
1. Enters the calibration (
CAL) mode
2. Displays and allows access to the CALIBRATION menu
3. Displays the
CAL legend on the main display
To exit the CALIBRATION menu Press the Quit softkey. On exit the Multimeter
displays the prompt to enter a calibration due date.
When in
CAL mode the following front panel keys become inoperative: CLR, TEST,
OFFSET, PRT and INPUT. Also the function of the SAMPLE key changes to become the
trigger key for initiating a calibration operation.
W Caution
When in
CAL mode with the CAL legend appearing on the main
display the function of the SAMPLE key is modified from
normal operation. If pressed, the
SAMPLE key will initiate a
calibration operation and permanently alter the Multimeter’s
calibration state. To avoid accidental mis-calibration do not
attempt to operate the Multimeter in External Trigger mode from
the front panel when in Cal, and only press the SAMPLE key
when a calibration operation is intended to be performed.
Calibration Menu
This menu allows calibration operations at the calibration point nominal values via Auto,
or selection of calibration operations at non-nominal values via
Set. It also offers access
to the special calibration menu. The
CAL legend appears in the left-hand display when in
CAL mode.
adj134f.eps
CALIBRATION Menu
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