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2. On the HP 85623, press
(nCTRL)
and
EXTENNfi
MIXER. The voltage on the DVM
should measure approximately
i-5
Vdc (TTL high).
3. On the HP 85623, press
[SCTRL)
and INTENNa MIXER. The voltage on the DVM
should measure approximately 0 Vdc (TTL low).
4. Connect the positive lead of a DVM to A15J901 pin 13 (LSID). The signal measured
turns on the SIG ID oscillator.
5. On the HP 85623, press SIG ID ON (if present),
(SGL-).
6. Subsequent pushes of
(j-1
should cause the signal measured on the DVM to toggle
between TTL high and low levels.
7. Connect an oscilloscope probe to A15U902 pin 7 (LRDIR) and the probe ground lead to
A15J901 pin 6. The signal measured controls the flatness compensation circuit.
8. On the HP 85623, press
[e)
and set the (SPAN) to 1 MHz.
9. Set the oscilloscope for the following settings:
Amplitude scale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2
V/div
Sweep time
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..20ms/div
10. The waveform should be at a TTL high during part of the retrace period and a TTL low
during the sweep (about 50 ms).
SIG
ID
Oscillator
(Option
008)
Refer to function block F on Al5 RF Section Schematic Diagram (sheet 4 of 4) in the
HP 8560 E-Series Spectrum Analyzer Component Level Information.
SIG ID is available only with Option 008. The SIG ID Oscillator provides a shifted third
LO (approximately 298 MHz) to distinguish true signals from false signals (such as image or
multiple responses). When the HP 85623 is set to SIC ID
t3N,
the SIG ID Oscillator turns on
during alternate sweeps.
1. Set the HP 85623 to the following settings:
Trigger
. . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . single sweep
SIG ID
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
2. Use an active probe with another spectrum analyzer to measure the signal level at
A15X602.
3. On the HP 85623, press
(SGL$i?@1.
With each press of
(-1,
the analyzer alternates
between the following two states:
State 1:
A15J901 pin 13 (LSID)
SIG ID Oscillator
Signal at A15X602
TTL low
ON
298 MHz
f50
kHz (at least i-1
dBm)
State 2:
A15J901 pin 13 (LSID)
SIG ID Oscillator
3rd LO Driver Amplifier
TTL high
OFF
Provides LO for Double Balanced Mixer
RF Section 12-19