Fluke 8508A User Manual page 162

8508A
Users Manual
Initial Setup and Connections
1. Press the
2. Press the
3. In calibration mode the resolution defaults to
4. Reselect .
5. Confirm that the 8508A is configured for internal guard (External Guard is
6. Ensure that the calibrator output is set to
7. Connect the Calibrator to the 8508A as shown above.
8. If using standard resistors in place of the calibrator refer to "Measuring Resistance"
Normal Mode Calibration
1. Press the
2. Press the
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 6-5 for the Normal
mode. For the 2 G range use the 1 G standard resistor in place of the calibrator. Just
one range can be calibrated if required, but for a full-calibration start with the 2
and work up to the 2 G range.
Note that EX SNS (4-wire) is not available on the 5720A 100 M range, and the 8508-
7000K 1 G standard resistor is used as a 2-wire device with the calibrator 2-wire
resistance zero used for the corresponding zero points.
when calibrating the 200 M and 2 G 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.
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.
Zero Point
1. On the 8508A, select the required range.
2. On the Calibrator, select zero and Operate. Alternatively if using a standard resistor
3. On the 8508A, press
4. Press
Calibration is complete when the Busy legend goes out and the calibrated measurement is
displayed
6-18
key and select the
key and select
CONFIG
recommended that this resolution is used for calibration of all resistance ranges.
deselected) by checking that the
display.
Guard ( is deselected). On the calibrator select
EXT GRD
in Chapter 3 for information regarding 4-wire resistance connections.
key and select the
key and select
CONFIG
connect the standard resistor for a 4-wire resistance zero. (For the 200 M and 2 G
ranges, de-select EX SNS on the calibrator and de-select
CAL
to initiate the calibration operation.
SAMPLE
range.
200
and .
Filt 4w
RESL7
legend does not appear on the left-hand
Ext Grd
STANDBY
range.
2
and . Ensure LoI is deselected.
Filt 4w
Note
to enter the
CALIBRATION
in the resistance function. It is
and configured for Internal
(4-wire).
EX SNS
is deselected on the 8508A
4W
n the 8508A.)
4W
menu.
range