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Assembly Descriptions and Block Diagrams
IF Section
• A14 log amplifier assembly. The A7 assembly controls two functions
on the A14 assembly:
Log/linear mode switching. A temperature-compensated control
bias voltage switches the seven A14 amplifier stages to function
as either linear amplifiers or logging amplifiers.
10 dB linear step gains. In linear mode, three
temperature-compensated control lines bias four of the seven
linear amplifiers to provide step gains in 10 dB increments over a
40 dB range. Two amplifiers are switched by one control line to
provide the 20 dB step-gain stage.
Linear step gain errors are corrected by the
self-calibration routine. Refer to
.
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A8 Power Supply
The A8 Power Supply is a switching power supply that plugs into a
connector on the A15 motherboard. It is not repairable to the
component level.
When the line switch is on, it produces the low-power-on (LPWRON)
signal that activates the power supply. The power supply then provides
the following:
• +12 V for the B1 fan.
• The +5 V, +15 V, −15 V, and +12 V supply voltages.
• A line-trigger signal (LINE_TRIG) at the power-line frequency.
• The high-power-on (WRUP) signal used to coordinate the start-up of
the A16 assembly.
• +12 V for the A2 display.
• −24 V for the YTF on the 8592L and 8593E.
A130 Narrow Bandwidth
The narrow bandwidth assembly, Option 130, provides four
synchronously-tuned bandwidths of 10 Hz, 30 Hz, 100 Hz, and 300 Hz.
In addition, it also has a 200 Hz CISPR bandwidth. There are no
adjustments necessary on this assembly. All adjustments and
corrections are done automatically during the self-cal routine.
When the narrow bandwidths are selected, the analyzer re-routes the
IF signal through the narrow bandwidth assembly. The narrow
bandwidth assembly has a built-in step gain, log amplifier, and detector
which performs all the normal IF section duties. Therefore, the IF
specifications must be tested first in the wide bandwidth mode, then
repeated for the narrow bandwidth mode.
378
CAL AMPTD
Chapter 13
for a description of
Chapter 9
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Table of Contents
Troubleshooting
