Agilent Technologies HP 8566B Spécifications Page 209

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5. Log Amplifier Adjustments
5.
Log
Amplifier
Adjustments
Reference
Related Performance
Tests
Note
Description
Equipment
IF-Display Section
A4A3
Log Amplifier-Filter
A4A2
Log Amplifier-Detector
Scale Fidelity Test
The
A4A3
Log Amplifier-Filter and
A4A2
Log Amplifier Detector
are temperature compensated as a matched set at the factory. In
the event of a circuit failure, a new matched set must be ordered.
Contact your nearest HP Service Center.
The
A4A2
Log Amplifier-Detector ZERO adjustment is checked and
adjusted if necessary, then the
A4A3
Log Amplifier-Filter is set for
center frequency by injecting a signal and adjusting the bandpass filter
center adjustment for maximum DVM indication. The
bandpass
filter
amplitude is adjusted by monitoring the output of the filter control
line shorted and not shorted to the + 15V supply. Next, log fidelity
(gain and offset of the log curve) is adjusted by adjusting the -12 VTV
and the PIN diode attenuator. Last, the linear gain step adjustments
are performed to set the proper amount of step gain in the linear
mode of operation.
Figure 3-33. Log Amplifier Adjustments Setup
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A
Adjustments 3-69
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