Agilent Technologies HP 8642A/B Specifiche Pagina 408

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Table 8-1. Numbered Error Messages (12 of 17)
12
Insufficient span. Less than one waveform found. A minimum of four zero
crossings is necessary across the HP 3561A's display. This error occurs when the
system is measuring the Phase Detector Constant and the expected beatnote is < 1
kHz
Action:
When the system measures the Phase Detector Constant, the beatnote
frequency should be set to approximately 10% of the Peak Tuning Range (PTR) set for
the measurement. If it is not, verify the VCO Tuning Constant and Voltage Tuning Range
entered for the measurement. A procedure for evaluating the tuning sensitivity of the VCO
is provided in Estimating the Tuning Constant in Chapter 3 of the Operating Manual.
13
The (File) does not exist in the current (Directory) and has not been loaded.
This error occurs when the HP 3048A attempts to load a file and the disc containing that
file is not present in the designated mass storage device.
Action:
Insert the disc containing the required file and proceed.
14 DC offset from mixer > 1/2 peak voltage. The dc offset of the Phase Detector is
determined and then used to adjust the Phase Detector calibration constant for true slope
at the zero voltage point.
Action:
Observe the beatnote on the HP 3561A display or with an oscilloscope
connected to the AUX MONITOR port on the HP 11848A.
1.
Verify that the beatnote amplitude is correct for the signal level at the R input port
on the HP 11848A. Figure 8-5 shows the relationship between the beatnote level
and the level at the R port.
_j >
> TJ
UJ w
o
z
(-
<
Ld
no
-7
-17
-27
-37
03
-15
R PORT SIGNAL LEVEL CdBm)
Figure 8-5. Beatnote Level Relative to the Signal Level at the R Port.
Numbered Error Messages 8-13
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