Service manual

8508A
Service Manual
3-18
Resistance Calibration
When calibrating the resistance function, each of the resistance modes (Normal, LoI,
TruΩ, TruΩ LoI and HiVΩ) 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 GΩ standard
resistor provided in the 8508A-7000K calibration kit is used for ranges above 200 MΩ as
the highest resistance available from the 5720A calibrator is 100 MΩ. Refer to Table 3-5
for the resistance calibration points and sequence.
Table 3-5. Resistance Calibration Points and Sequence
8508A Range Modes Point Resistance
Zero 0 Ω 2 Ω Normal, Normal LoI,
TruΩ, TruΩ LoI
Range Gain 1 Ω
Zero 0 Ω 20 Ω Normal, Normal LoI,
TruΩ, TruΩ LoI
Range Gain 10 Ω
Zero 0 Ω 200 Ω Normal, Normal LoI,
TruΩ, TruΩ LoI
Range Gain 100 Ω
Zero 0 Ω 2 kΩ Normal, Normal LoI,
TruΩ, TruΩ LoI
Range Gain 1 kΩ
Zero 0 Ω 20 kΩ Normal, Normal LoI,
TruΩ, TruΩ LoI
Range Gain 10 kΩ
Zero 0 Ω 200 kΩ Normal, Normal LoI
Range Gain 100 kΩ
Zero 0 Ω 2 MΩ Normal, Normal LoI
Range Gain 1 MΩ
Zero 0 Ω 20 MΩ Normal, Normal LoI,
HiVΩ
Range Gain 10 MΩ
Zero 0 Ω 200 MΩ Normal, Normal LoI,
HiVΩ
Range Gain 100 MΩ
Zero 0 Ω 2 GΩ Normal, Normal LoI,
HiVΩ
Range Gain 1 GΩ
Zero 0 Ω 20 GΩ HiVΩ
Range Gain Optional
[1]
[1] 20 GΩ range gain is calibrated automatically during 2 GΩ HiVΩ range gain cal, but may be calibrated separately
(after 2 GΩ HiVΩ range cal) at 10 GΩ if a standard is available. The 100 MΩ and 2 GΩ NormalΩ ranges must be
calibrated before 2 GΩ HiVΩ range gain point.
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