Fluke 8508A User Manual page 181

Procedure
Perform the following sequence for each resistance mode and each range, as listed in
Table 6-10, starting with the 2
Normal and Normal LoI resistance modes. Then continue the sequence for the Tru
and Tru LoI modes, starting with the 2
Finally complete the sequence for the HiV mode, starting with the 20 M range and
working up to the 20 G range. An input zero operation is performed on each 8508A
range prior to performing the range verification measurements with the calibrator set to
zero . A separate zero operation is required on each range for each resistance mode.
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 point.
when checking the 200 M and 2 G range, range zero, and range gain points.
The Multimeter can deliver a lethal electric shock when operating in the
High Voltage Resistance mode. Voltages up to 240V may appear on the
terminals.
To avoid electric shock when performing the following calibration
procedures:
Never touch any lead or terminal unless you are absolutely certain
that no dangerous voltage is present.
Make sure that signal leads are in a safe condition before you
handle them in any way.
1. Press the
2. Press the
CONFIG
3. Select the required 8508A range.
4. On the Calibrator, select zero
resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 M
range and above, de-select Ex SNS on the calibrator and de-select
8508A.)
5. On the 8508A press the
operation.
The legend will appear, and then extinguish when the zero operation has
Busy
completed.
6. On the Calibrator, select Range Gain point Output value. Alternatively if using a
standard resistor re-connect the standard resistor to measure its resistance.
7. Note the 8508A reading. Compare the result with the allowable tolerance, taking into
account the actual value of the calibrator resistance output for this value or the
calibrated value of the resistance standard used.
8. Repeat steps 3 – 7 for the remaining ranges of the selected resistance mode. (For the
2G and 20 G ranges the 8508-7000K 1 G standard resistor is used in place of
the calibrator. For the 200 M range and above, de-select Ex SNS on the calibrator
and de-select
9. Set the calibrator output to
10. Press the
range and working up to the 2 G range for the
XW Warning
key.
key and select
Filt
and Operate. Alternatively if using a standard
key, and select
INPUT
n the 8508A).
4W
STANDBY
key.
range and working up to the 20 k range.
is deselected on the 8508A
4W
, , and . Ensure
RESL7 4w
to initiate the zeroing
Zero Rng
.
Calibration and Verification
Performance Verification
is deselected.
LoI
n the
4W
6
6-37