8508A
Users Manual
Range Zero and Gain Points
1. On the 8508A, press the Ω key and select the required range.
2. On the Calibrator select zero and
OPR to operate the output.
Alternatively if using a standard resistor, connect the standard resistor for a 4 wire
resistance zero.
3. On the 8508A press
CAL to enter the CALIBRATION menu.
4. Press
SAMPLE to initiate the adjustment operation.
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
5. On the Calibrator select the range gain resistance value.
Alternatively if using a standard resistor, re-connect the standard resistor to measure
it's resistance.
6. If the Set feature is being used:
On the 8508A, select Set on the
CALIBRATION Menu.
Use the numeric keys with the
SET VALUE menu to enter the true output value of the
calibrator at the range gain point, then press Enter.
7. Press
SAMPLE to initiate the adjustment operation.
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
8. Press the Ω key to revert to the ranges menu.
LoI
Ω
Mode Adjustment
Follow the procedure for Normal Ω Mode Adjustment ensuring that LoI is selected. Press
the Ω key. Press the CONFIG key and select LoI.
Range Zero and Gain Adjustment Procedure
After the initial setup and connecting up, use the following procedure to adjust range zero
and range gain for the ranges and points detailed in Table 6-5 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
adjusted, if required, but for a full-adjustment 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 8508A
when adjusting the 200 MΩ and 2 GΩ range, range zero, and range gain points.
On each range, the 8508A 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 step 6 for the
Range Gain Point.
6-22
To Next Page
Loading...
