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] and check that pulses occur when toggling between REF‘ LVL settings of -10 dBm and -20 dBm.

13.Monitor A3U401B pin 9 (LLOGSTB) with an oscilloscope or logic probe. This is the strobe for the A4 log amplifier/Cal oscillator assembly.

14.Press (Wj and check that pulses occur when toggling between LINEAR and

Lac mfm.

Interface Strobe Select

Refer to function block K of A3 Interface Assembly Schematic Diagram in the

HP 8560 E-Series Spectrum Analyzer Component Level Information.

Interface strobe select Assembly. Table 8-10 A3U500.

generates the various strobes used by circuits on the A3 Interface and Table 8-11 are the truth tables for demultiplexers A3U410 and

Table 8-10. Demultiple :er A3U410 Truth Table

 

Selected Output Line

IA1

 

Pin 15, LSCAN-KBD

L

 

Pin 14, LDACUl

H

 

Pin 13, LDACl

L

 

Pin 12, LDAC2

H

 

Pin 11, LDACS

L

 

Pin 10

H

 

Pin 9, LTIMER

L

 

Pin 7, LADC-REGl

H

IA2

IA3

L

L

L

L

H

L

H

L

L

H

L

H

H

H

H

H

Table 8-l 1. Demultiple :er A3U500 Truth Table

Selected Output Line

IA0

Pin 15, LSENSE-KBD

L

Pin 14, LINT-PRIOR

H

Pin 13, LADC-DATA1

L

Pin 12, LDAC-DATA0

H

Pin 11, HCNTR-LDO

L

Pin 10, HCNTR-LDl

H

Pin 9, LRPG-RD

L

Pin 7, LADC-REGO

H

IA1

IA2

L

L

L

L

H

L

H

L

L

H

L

H

H

H

H

H

8-30 ADC/lnterface Section

Page 304
Image 304
Agilent Technologies 856290216 Interface Strobe Select, Demultiple er A3U410 Truth Table, Demultiple er A3U500 Truth Table