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Operating Guide
4
Do not attempt to force the switch between 0 and the highest value position
CAUTION
as there is a stop between these switch positions.
Operator's check
The operator's check allows the operator to make a quick check of the instrument
prior to use or if a failure is suspected.
Description
The attenuator is driven from a 50-Ω signal source at 1 kHz. The output level from
the attenuator is detected by a narrow-bandwidth voltmeter. The attenuator and
detector range switches are stepped together and the variations in level noted.
This verifies that each attenuator section is being properly switched and checks
the low-frequency accuracy of the attenuator.
The SWR meter used in this check is calibrated for a square-law detector.
NOTE
Therefore, the range changes and errors (read in dB) are twice that indicated by
the meter.
SWR meter
Function generator
Attenuator
Adapter
Adapter
Input
Output
Ω
(50
)
Figure 4-1
Operator's check setup
Keysight 8494/95/96A/B Operating and Service Manual
25
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