Service manual

Operating Guides 3
Agilent 8494/95/96A/B Attenuators Operating and Service Manual 23
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- ohm 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.
Figure 2 Operator’s Check Setup
CAUTION
Do not attempt to force the switch between 0 and the highest value position
as there is a stop between these switch positions.
NOTE
The SWR meter used in this check is calibrated for a square-law detector.
Therefore, the range changes and errors (read in dB) are twice that indicated by
the meter.
SWR meter
Attenuator
Adapter
Adapter
Output
50 Ω
Input
Function generator