Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 409)

100

101

Table 8-1. Numbered Error Messages (13 of 17)

(cont'd)

Verify that the Phase Detector DC offset is < 30 mV (< 50 mV for the 1.2 to

1.8 GHz Phase Detector). If the dc offset is within this limit and the beatnote level

is < -23 dBV (< 0.1 Vpk at AUX MONITOR port), increase the beatnote level, if

possible, by increasing the signal level at the R port. If the beatnote level cannot be

increased sufficiently it may be necessary to decrease the dc offset by changing the

carrier frequency.

Detector Constant < 0.02 V/Rad. The measured Phase Detector Constant was below

the system's 20 mV limit.

Action:

Observe the beatnote on the HP 3561A display or with an oscilloscope

connected to the AUX MONITOR port on the HP 11848A. Verify that the beatnote

amplitude is correct for the signal level at the R input port on the HP 11848A. Figure 8-6

shows the relationship between the beatnote level and the level at the R port. If

necessary, increase the signal level at the R port and verify that the signal level at the

L port is > +15 dBm (> +7 dBm for the 1.2 GHz to 18 GHz Phase Detector).

< _

-i S

W CO

-" -27

U _Q7

Figure 8-6. Beatnot

i i y

i \ /

- - + - / -

/ i i

-.3 .a

-.i 38

- .05 °t

15 -5 +5 +15

PORT SIGNAL LEVEL CdBm)

e Level Relative to the Signal Level at the R Port.

8-14 Numbered Error Messages

1 2 ... 404 405 406 407 408 409 410 411 412 413 414 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 409

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