Service manual

8508A
Service Manual
3-22
Zero Point
1. On the Multimeter, select the required range.
2. On the Calibrator, select zero Ω and Operate. Alternatively if using a standard
resistor connect the standard resistor for a 4-wire resistance zero.
3. On the Multimeter, press
CAL to enter the CALIBRATION menu.
4. Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated
measurement is displayed.
Range Gain Point
1. On the Calibrator, select Range Gain point Output value. Alternatively if using a
standard resistor re-connect the standard resistor to measure its resistance.
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.
Tru
Ω LoI Mode Calibration
1. Press the
Ω Plus key and select TruΩ. From the TruΩ menu select the 2Ω 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 TruΩ LoI
mode. Just one range can be calibrated if required, but for a full calibration start with the
2 Ω range and work up to the 20 kΩ range.
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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