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Operator's
Check
Using Oscillator
and SWR Meter
NOTE
Operating Instruction
Operating Instruction
The operator's check is supplied to allow the operator to make a quick check
of the attenuators 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 (that
is, the SWR meter). A reference level is set up on the detector using a
through connection in place of the attenuator. The attenuator is then inserted
and the change in the detector level is noted. This checks the low frequency
accuracy of the attenuator.
The SWR meter used in this check is calibrated for a square-law detector
and therefore the range changes and errors (read in dB) are twice that
indicated by the meter.
Quick-Check Procedure
1. Connect the equipment as shown in the
attenuator and connect the adapters directly together.
TEST OSCILLATOR
OUTPUT
50 Ω
Figure 1
Equipment Setup Using Oscillator and SWR Meter
12
Figure 1
ATTENUATOR
ADAPTER
ADAPTER
849x and 1158x Operating and Service Manual
except remove the
SWR METER
INPUT
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