Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 411)

Table 8-1. Numbered Error Messages (15 of 17)

The system perceives that the signals from the two sources differ by more

than 15% of the VCO Tuning Range. The sources may be retuned to reduce the

beatnote frequency, or the VCO Tuning Range may be adjusted.

Once the HP 3048A has measured the VCO Tuning Constant, it is able to predict the tune

voltage necessary to phase lock the loop. If the tuning range required for lock is > 15%

of the Peak Tuning Range (PTR), The system may not be able to pull the sources into

lock, and will have very little tuning range {< 5% of PTR) left for drift tracking.

Action:

Tune the center frequency of one or both sources to adjust the beatnote to within

the Capture Range set for the measurement. As you adjust the beatnote frequency

toward 0 Hz, you may find it helpful to press the |Span softkey to decrement the

analyzer's span setting. (A complete procedure for adjusting the beatnote is

provided in the Checking the Beatnote portion of each Phase Lock Loop measure-

ment example in Chapter 3 of the Operating Manual.)

If necessary, change the Center Voltage value entered for the VCO to reduce

the initial beatnote frequency, or increase the Tuning Voltage Range entered for the

VCO to provide a larger Peak Tuning Range (PTR). (Details on adjusting the PTR are

provided in Changing the PTR in Chapter 3 of the Operating Manual.)

There is no HP 3585A in the configuration table. This task requires that an

HP 3585A Spectrum Analyzer is configured into the HP 3048A system.

Action:

Enter an HP 3585A into the System Configuration Table.

Unable to detect presence of HP 3561A noise source.

Check cabling and HP 3516A Noise Source Function.

Action:

Verify that the HP 3561A rear-panel "Source Out" port is connected to the

HP 11848A rear-panel "Noise Input" port.

User tone not within +/-500 Hz of 55 KHz.

Press re-try if you wish to re-adjust and continue. The frequency of the tone

generator is not close enough to the required limits.

Action:

Adjust tone generator if possible. If the tone generator cannot meet this

requirement, replace it with one that can.

8-16 Numbered Error Messages

1 2 ... 406 407 408 409 410 411 412 413 414 415 416 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 411