Service manual

8508A
Service Manual
3-8
adj138f.eps
SER# Menu
The SER# menu provides the selection:
Enter Stores the new serial number, de-activates the keyboard, and reverts to the
SPCL menu.
Quit Reverts to the SPCL menu, leaving the old serial number intact.
Hvlin Menu
This menu sequence is obtained by selecting
Hvlin from the SPCL menu. It allows the
linearity of the 1kV DC range to be calibrated with the application of five input signals of
-1000V, -500V, 0V, +500V and +1000V in turn, with the 1kV DC range selected. On
entry to the menu, the user is prompted to apply the first input signal required and step
through the sequence:
adj135f.eps
Hvlin Menus
Pressing the SAMPLE key initiates the calibration operation at the signal level displayed
for the step in progress and; also, saves the result for calculation of the
Hvlin linearity
correction factor at the end of the sequence.
PREV Moves back to the previous menu allowing the user to repeat the previous
step in the sequence if required.
NEXT Moves forward through the sequence to the next step and signal level.
CALC Initiates calculation and storage of the high voltage linearity correction
factor, completing the
Hvlin calibration process.
Non-volatile input offset compensation
Good metrology practice should ensure that all high-precision measurements made with
the Multimeter are preceded by an input zero of each measurement. However, a non-
volatile input-offset compensation is independently available for the front and rear inputs
and will be used whenever the input zero capability is not in use. The compensation is
retained after power down, is unaffected by clearing the volatile input zeros, and is
unaffected by range zero calibration adjustments. Compensation is available on all
functions, and includes separate compensation of 2-wire and 4-wire measurements in the
resistance functions.
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