Agilent Technologies HP 8642A/B Specifiche Pagina 397

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Table 8-1. Numbered Error Messages (1 of 17)
The Signal level entering the NOISE INPUT port of the HP 11848A exceeds
1 volt peak.
Action:
Press the Retry key. If the overload condition was transient, the system will
proceed with the measurement. If Error 1 occurs again, reduce the signal level at the
NOISE INPUT port on the HP 11848A.
If an HP 11729C is being used to make an AM measurement, insert a 20 dB {50 0) pad
in the NOISE INPUT signal
path.
The pad should be connected directly to the HP 11848A.
The loop suppression peak exceeds 10 dB. Excessive peaking can be caused by
various conditions. Continuing with the measurement without verifying loop suppression
may result in measurement accuracy degradation at offset frequencies within a decade
of the PLL bandwidth.
NOTE
The SOURCE OUT port on the rear-panel of the HP 3561A must be
connected to the NOISE INPUT port on the rear panel of the HP 11848A.
If these ports are not connected, connect them now, press the Retry softkey.
Excessive loop suppression peaking is generally caused by one of three conditions. Each
condition produces a somewhat different response of the loop suppression curve. The
loop suppression curve is displayed on the HP 3561A after the system has completed the
loop suppression characterization. Figure 8-1 illustrates the typical curve response for
each of the three conditions.
Action:
If the loop suppression peak for your measurement exceeds 10 dB (Error 2),
observe the loop suppression curve displayed on your HP
3561 A.
Then refer to the
following condition described for the curve in Figure 8-1 that most closely resembles the
curve displayed on your HP
3561
A.
8-2 Numbered Error Messages
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