Agilent Technologies 8564EC, Service Manual

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Chapter 2 83
Adjustment/Diagnostic Software
To Use the Diagnostics
Latch Control
Latch control is very similar to the DAC control diagnostics except you
can control individual bits. Use state 1 setup (refer to step 1 in
”DAC
Control” ).
Display IF CAL Data
With the IF CAL data displayed, you can check for control problems
using a logic probe on the latches. You can also check the DAC values.
The DAC values for each filter pole should be within a 32 DAC-count
range.
NOTE
When you change the spectrum analyzer state, you need to EXIT the
"Display IF CAL Data" program and SELECT it again.
Table 2-4 Latch Control Recommended Instrument State
Latch Reference
Designator Recommended
Instrument State*
IF Latch 1 A5U808 State 1
IF latch 2 A5U811 State 1
Log Latch 1 A4U103 State 1
Log Latch 2 A4U104 State 1
Log Latch 3 A4U105 State 1
Control 1 Latch A14U313 State 1
Control 2 Latch A14U417 State 1
Scan Time Range Latch A14U309 State 1
Span Attenuator Latch A14U310 State 1
RF Attenuator Latch A14U406 State 1
PIN Switch Latch A14U425 State 1
Offset Lock Loop Latch A15U904 State 1
RF Latch A15U903 State 1
*Refer to steps 1 and 3 of ”DAC Control” for spectrum analyzer state settings,
unless
otherwise noted.