Service manual

8508A
Service Manual
3-6
SPOT CAL Menu
This menu is obtained by pressing the Set key in the CALIBRATION menu when the
Multimeter is in ACV Spot Frequency mode. It provides a means of calibrating the
Multimeter at any of six user-specific spot frequencies, at non-nominal calibration values
for each ACV range. The Multimeter will already be set to an ACV range on entry to the
menu.
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SPOT CAL Menu
This menu allows a user to select a spot frequency (Spx) for the selected range. It defines
six menu keys:
Sp1: Displays the SPOT 1 RMS menu, where users define the RMS value for
the Spot Frequency 1 calibration point on the currently selected range.
Sp2-6: Same as Sp1 but permitting their own RMS values to be defined.
SPOT (1 to 6) RMS Menus
On entry to one of the six SPOT (x = 1 to 6) RMS menus, the nominal cardinal point
value is displayed and the keyboard is activated. A numeric value can be entered that
represents the RMS value of the calibration source signal.
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SPOT n RMS Menus
Enter Stores the displayed RMS value and de-activates the keyboard.
The dot-matrix display moves to the
SPOT FREQUENCY (1 to 6) menu,
showing the calibration signal frequency.
Quit Reverts to the
SPOT CAL menu, not storing any new Spot value.
Note
The
SAMPLE key is still enabled in the next menu.
SPOT FREQUENCY (1 to 6) Menu
Enter this menu by pressing
Enter in the SPOT (1 to 6) RMS menu, which also stores the
RMS value keyed in during this menu. The value in the
SPOT FREQUENCY (1 to 6)
menu is the measured frequency of the present calibration input signal.
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SPOT FREQUENCY n Menu
Pressing the SAMPLE key causes the selected ACV range to be spot-calibrated at the
calibration signal frequency. The frequency value is stored and can be viewed from the
UTILITY menu. Any subsequent measurement on this range whose frequency is within
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