28 Agilent 8494/95/96G/H Attenuators Operating and Service Manual
3Operating Guides
Operating Instructions
Either RF connector may be used as the input or output
connector. Connect the solenoid drive cable to the solenoid drive
connector (J1). By applying the proper voltage and grounds to the
proper pins of J1, the attenuator will either increase or decrease
the amount of attenuation as selected.
Operator’s Check
The Operator's Check is supplied to allow 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.
Do not apply RF power greater than 1 W average, or 100 W peak with a
maximum pulse width of 10 microseconds. If these limits are exceeded, the
attenuators may be damaged.
Do not ground both solenoid drive pins at the same time. This causes rapid
cycling of the solenoid and could reduce the operating life of the attenuator.
The rapid cycling may produce a buzzing sound from the attenuator.
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.
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