HP 8568B, Performance Tests And Adjustments Manual, Page: 25 / 313

1. Center Frequency Readout Accuracy
1. Center
Frequency Readout
Accuracy
Related Adjustments
Specification
(uncorrected)
Description
Frequency Control Adjustments
Time Base Adjustment
Step Gain and 18.4 MHz Local Oscillator Adjustments
50 MHz Voltage-Tuned Oscillator Adjustments
of frequency span + frequency reference error x tune frequency
of resolution bandwidth s 10 Hz) in AUTO resolution
bandwidth after adjusting FREQ ZERO at stabilized temperature.
A synthesized signal source that is phase-locked to a known frequency
standard is used to input a signal to the analyzer. The frequency
readout of the analyzer is compared to the actual input frequency
for several different frequency settings over the analyzer’s range.
The signal source is phase-locked to a standard known to be as
accurate as the analyzer’s internal frequency reference to minimize
the “frequency reference error x center frequency” term of the
specification.
ANALYZER
STANDARD
INPUT
ADAPTER
SYNTHESIZED
Figure 2-1. Center Frequency Accuracy Setup
Performance Tests