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HP 8560A

HP 8560A
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582 AMPL
583 RBW 30K
584 RBW
IOOK
Unable to adjust 100 kHz and
210
kHz Resolution Bandwidths. Bad
CALOSC Calibration in Sweep Rate. Test the 100 kHz Resolution
Bandwidth filter 3 dB bandwidth as follows:
1. Connect the CAL OUTPUT signal
(A4J8)
to the INPUT 50R.
2. Press (PRESET) and set the controls as follows:
CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . .
.300
MHz
SPAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500kHz
Resolution Bandwidth . . . . . . . . . . . . . . . . . . . . . . 100
kHz
LOG dB/DIV
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
dB
REF LEVEL . . . .adjust to place signal peak at top of the screen
3. Press (PEAK SEARCH) and MARKER DELTA and turn the knob
clockwise to position the marker until the delta MKR reads -3
dB
+/-.l dB.
4. Press MARKER DELTA and move the marker to the other side of the
peak until the delta MKR reads 0
dB +/-.l dB.
5. If the delta MKR frequency is between 90 kHz and 110 kHz,
the 100 kHz Resolution Bandwidth is working properly. If the
frequency is outside these limits, read the following information on
the A4 Cal Oscillator sweep generator.
If the 100 kHz Resolution Bandwidth works properly, the A4 Cal
Oscillator sweep generator is failing to sweep its oscillator frequency at
the correct rate. The error is detected in sweeping on the skirts of the
100
kHz Resolution Bandwidth.
A properly operating sweep generator generates a series of
negative-going parabolas. These parabolas generate the sweeps used to
adjust resolution bandwidths of 10
kHz and below. Check the sweep
generator with the following steps. Refer also to “300 Hz to 3 kHz
Resolution Bandwidth Out of Specification” in the A4 Cal Oscillator
troubleshooting text in Chapter 8.
1. Remove the shields.
2. Connect an oscilloscope probe to
A4U804C pin 8.
3. On the spectrum analyzer, press (CAL) and FULL IF ADJ .
4.
Approximately 8 seconds after starting the FULL IF ADJ , check
for negative-going parabolas (similar to half-sine waves) 5 ms wide
and approximately -4 V at their peak. Refer to Chapter 8, “IF
Section,” for more information on the A4 Log Amp/Cal Oscillator
Assembly.
Unable to adjust 30 kHz Resolution Bandwidth. SYSBW and LCBW
disagreement in LCCAL.
Unable to adjust 100
kHz Resolution Bandwidth. SYSBW and LCBW
disagreement in LCCAL.
6-30 General Troubleshooting

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