Service manual

8508A
Service Manual
3-20
Calibration is complete when the Busy legend goes out and the calibrated measurement is
displayed
Range Gain Point
1. On the Calibrator, select the Range Gain point resistance value. Alternatively if using
a standard resistor re-connect the standard resistor to measure its resistance. (For the
2 GΩ range the 8508-7000K 1 GΩ standard resistor is used in place of the calibrator.
For the 200 MΩ and 2 GΩ ranges, de-select EX SNS on the calibrator and de-select
4WΩ οn the Multimeter.)
2. On the Multimeter, Press
CAL to revert to CALIBRATION menu.
3. Select
Set on the CALIBRATION menu.
4. Use the numeric keys with the
SET VALUE menu to key in the true output value of
the calibrator (or the value of the resistance standard) at the range gain value, then
press Enter.
5. Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated
measurement is displayed.
6. On the Calibrator, set
STANDBY.
7. Press the
Ω key to revert to the ranges menu.
LoI
Ω Mode Calibration
1. Press the
Ω key and select the 2 Ω range.
2. Press the
CONFIG key and select Filt, LoI and 4wΩ.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range
zero and range gain for the ranges and points detailed in Table 3-5 for the LoI mode. For
the 2 GΩ range use the 1 GΩ standard resistor in place of the calibrator. Just one range
can be calibrated, if required, but for a full-calibration start with the 2 Ω range and work
up to the 2 GΩ range.
Note that EX SNS (4-wire) is not available on the 5720A 100 MΩ range, and the 8508-
7000K 1 GΩ standard resistor is used as a 2-wire device with the calibrator 2-wire
resistance zero used for the corresponding zero points.
4WΩ is deselected on the
Multimeter when calibrating the 200 MΩ and 2 GΩ range, range zero, and range gain
points.
On each range, the Multimeter automatically recognizes the appropriate value as range
zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal
value required. The Set feature allows a user to enter the true output value
of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4
for the Range Gain Point.
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