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A Detection Measurements
For the majority of measurements, AC detection is still the preferred method.
AC detection o ers greater sensitivity and immunity to noise and drift across
time and temperature. AC detection amplitude measurements with this scalar
network analyzer system require a modulation envelope. his envelope is
provided through a 27.778 kHz square wave amplitude modulation of the RF
test signal. est set connections vary depending on the source. Figure 3-2
depicts a typical measurement setup. he 27.778 kHz modulation is supplied by
the sweep oscillator.
Operator's heck
he following procedure provides a quick operational check of the
85025A/B/D/E detector.
Table 3-1. Equipment Required for Operator's Check
Description
Detector
GPIB cable
Bandpass lter
Sweep oscillator
BNC cables (3 required) part number 8120-1839
3-6
Operat on
Model/Part Number
85025A/B/D/E
10833A/B/C/D
any within the frequency range of the sweeper
any compatible with the 8757 series
scalar network analyzer
Ag lent 85025A/B/D/E
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