Service manual

28 Agilent 8495D/K Attenuators Operating and Service Manual
3Operating Guides
Operating Instructions
Operating Information
Either RF connector may be used as the input or output
connector. Connect the solenoid drive cable of the programmable
attenuator to the solenoid drive connector (Jl). By applying the
proper voltage and grounds to the proper pins of Jl, 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.
CAUTION
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.
CAUTION
For the 8495K, do not ground both solenoid drive pins of the programmable
attenuator 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.