Resistance Calibration - Fluke 8508A Service Manual

8508A
Service Manual

Resistance Calibration

When calibrating the resistance function, each of the resistance modes (Normal, LoI,
Tru , Tru LoI and HiV ) must be individually calibrated. The following procedure
assumes use of a multifunction calibrator and calibrates each resistance mode in turn,
range by range. If individual standard resistors are used it may be more convenient to
calibrate all the modes in turn for each resistance value to avoid connecting the same
resistance standard several times during the calibration sequence. A 1 G standard
resistor provided in the 8508A-7000K calibration kit is used for ranges above 200 M as
the highest resistance available from the 5720A calibrator is 100 M . Refer to Table 3-5
for the resistance calibration points and sequence.
8508A Range
2
20
200
2 k
20 k
200 k
2 M
20 M
200 M
2 G
20 G
[1] 20 G range gain is calibrated automatically during 2 G HiV
(after 2 G HiV range cal) at 10 G if a standard is available. The 100 M and 2 G Normal ranges must be
calibrated before 2 G HiV range gain point.
3-18
Table 3-5. Resistance Calibration Points and Sequence
Modes
Normal, Normal LoI,
Tru , Tru LoI
Normal, Normal LoI,
Tru , Tru LoI
Normal, Normal LoI,
Tru , Tru LoI
Normal, Normal LoI,
Tru , Tru LoI
Normal, Normal LoI,
Tru , Tru LoI
Normal, Normal LoI
Normal, Normal LoI
Normal, Normal LoI,
HiV
Normal, Normal LoI,
HiV
Normal, Normal LoI,
HiV
HiV
Point
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
Zero
Range Gain
range gain cal, but may be calibrated separately
Resistance
0
1
0
10
0
100
0
1 k
0
10 k
0
100 k
0
1 M
0
10 M
0
100 M
0
1 G
0
[1]
Optional