Agilent Technologies HP 8642A/B Specifiche Pagina 417

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Table 8-3. Reference Messages (1 of 7)
Establish quadrature manually.
Action:
Manually adjust the source frequency or the phase shifter to attain quadrature
(within ±1 division of center scale on the HP 11848A's Quadrature Meter). If the meter
is pegged, connect an oscilloscope or voltmeter to the AUX MONITOR port on the
HP 11848A and then adjust the source frequency or the phase shifter to decrease voltage
level until the level can be observed on the quadrature meter.
The FM Deviation on the (source) will be changed from ___to ___ Hz. In order
to zero the beatnote, the HP 3048A had to change the center frequency of the source.
As a result, FM Deviation must be adjusted to within the limits of the source at the new
frequency. Note that a reduced Tuning Constant (deviation) will result in a narrower Peak
Tuning Range (PTR) for the measurement.
Action:
If the narrower PTR is adequate for the measurement, proceed. If the resulting
PTR will not provide sufficient Capture and Drift Tracking Ranges for the stability of the
signal sources, you may need to select a different VCO source with a greater tuning
range.
If your VCO source is an HP 8642A/B and the carrier frequency for the measurement
is < 123 MHz, the following steps will enable you to increase the tuning range of the
HP 8642A/B.
1.
Configure the HP 3048A Source Control block diagram for manual control of the
HP 8642A/B.
2.
Select the HP 8642A/B HET Band for 1.5 MHz maximum deviation. Note that
the increase in deviation causes an increase in the HP 8642A/B's noise level as
well.
Reference Messages 8-21
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