Interface Strobe Select - Agilent Technologies 8564EC Service Manual

6. Press and set the controls as follows:
PRESET
Span ................................................................................. 0 Hz
Trigger ...................................................................... SINGLE
7. Monitor A3U401 pin 3 (LR_STB) with an oscilloscope or logic probe.
This is the strobe for the A15 RF assembly.
8. Press and
AUX CTRL
toggling between
9. Monitor A3U401 pin 5 (LF_STB) with an oscilloscope or logic probe.
This is the strobe for the A14 frequency control assembly.
10.Press
AMPLITUDE
between settings of 10 and 20 dB.
ATTEN
11.Monitor A3U401B pin 7 (LIF_STB) with an oscilloscope or logic
probe. This is the strobe for the A5 IF assembly.
12.Press
AMPLITUDE
settings of −10 dBm and −20 dBm.
between
REF LVL
13.Monitor A3U401B pin 9 (LLOG_STB) with an oscilloscope or logic
probe. This is the strobe for the A4 log amplifier/cal oscillator
assembly.
14.Press
AMPLITUDE
between and
LINEAR

Interface Strobe Select

Refer to function block K of A3 Interface Assembly Schematic Diagram
(sheet 3 of 6) in the 8560 E-Series Spectrum Analyzer Component Level
Information.
Interface strobe select generates the various strobes used by circuits on
the A3 Interface Assembly.
page 410 are the truth tables for demultiplexers A3U410 and A3U500.
Chapter 8
and check that pulses occur when
REAR PANEL
and
10 MHz INT 10 MHz EXT
and check that pulses occur when toggling
and check that pulses occur when toggling
and check that pulses occur when toggling
.
LOG DB/DIV
Table 8-9 on page 410
ADC/Interface Section
A3 Assembly Control Circuits
.
and Table 8-10 on
409