Fluke 8508A - Non-Nominal Values; Enabling Access to Calibration Adjustment Mode; Calibration Menus; Accessing the Calibration Menus and Calibration Mode

8508A
Users Manual
Non-Nominal Values
The
Set facility allows the user to set the adjustment target to the value of the calibration
standard available. This facility is most useful when the user’s calibration standard is not
available at the nominal values specified, or when the user has knowledge of the actual
output of the calibration standard 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 8508A adjustment.
Enabling Access to Calibration Adjustment Mode
Rear Panel Calibration Switch
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 adjustment mode
via the front panel
CAL key and the CALIBRATION menu, and also enables the remote
IEEE 488 interface adjustment commands. Setting the switch to DISABLE and applying
a calibration integrity seal 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 instrument to respond as follows:
1. Enters the adjustment (
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 instrument displays
the prompt to enter a calibration due date.
When in
CAL mode the following front panel keys become inoperative: CLEAR, TEST,
OFFSET, PRT and INPUT. Also the function of the SAMPLE key changes to become the
trigger key for initiating an adjustment operation.
 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 an adjustment operation and
permanently alter the instrument calibration state. To avoid accidental
mis-adjustment do not attempt to operate the instrument in External
Trigger mode from the front panel when in Cal, and only press the
SAMPLE key when an adjustment operation is intended to be
performed.
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