Table 7-10 Demultiplexer A3U410 Truth Table; Interface Strobe Select - HP 8560E Service Manual

7. Monitor A3U401 pin 3 (LR_STB) with an oscilloscope or logic probe.
8. Press
9. Monitor A3U401 pin 5 (LF_STB) with an oscilloscope or logic probe.
10.Press
11.Monitor A3U401 pin 7 (LI_STB) with an oscilloscope or logic probe.
12.Press
13.Monitor A3U401 pin 9 (LV_STB) with an oscilloscope or logic probe.
14.Press

Interface Strobe Select

Refer to function block K of A3 Interface Assembly Schematic Diagram
(sheet 3 of 6) in the
Information
Interface strobe select generates the various strobes used by circuits on
the A3 Interface Assembly.
page 388
Table 7-10 Demultiplexer A3U410 Truth Table
Pin 15, LSCAN_KBD
Pin 14, LDACU1
Pin 13, LDAC1
Pin 12, LDAC2
Pin 11, LDAC3
Pin 10
Pin 9, LTIMER
Pin 7, LADC_REG1
Chapter 7
This is the strobe for the A15 RF assembly.
and
AUX CTRL
toggling between
10 MHz INT
This is the strobe for the A14 frequency control assembly.
and check that pulses occur when toggling
AMPLITUDE
between settings of 10 and 20 dB.
ATTEN
This is the strobe for the A5 IF assembly.
and check that pulses occur when toggling
AMPLITUDE
settings of −10 dBm and −20 dBm.
between
REF LVL
This is the strobe for the A4 log amplifier/cal oscillator assembly.
and check that pulses occur when toggling
AMPLITUDE
between and
LINEAR
HP 8560 E-Series Spectrum Analyzer Component Level
.
are the truth tables for demultiplexers A3U410 and A3U500.
Selected Output Line
and check that pulses occur when
REAR PANEL
and
10 MHz EXT
.
LOG DB/DIV
Table 7-10 on page 387
IA1 IA2
L L
H L
L H
H H
L L
H L
L H
H H
ADC/Interface Section
A3 Assembly Control Circuits
.
and Table 7-11 on
IA3
L
L
L
L
H
H
H
H
387