Symmetricom 5071A Assembly And Service Manual

1. Performance Tests – Verifying Specifications
5071A Complete Performance Tests
11
Procedure
If you are using the HP/Agilent 3585B Spectrum Analyzer, follow the steps
below to test for harmonic signals on the 5 and 10 MHz outputs. If you are
using a different spectrum analyzer, use these steps as a guide for operation
of that analyzer.
1 Connect the 5071A Port 1 to the HP/Agilent 3585B analyzer as shown in
Figure 1-3. Set the 3585B for 50 input impedance.
2 On the 5071A, set output ports 1 and 2 to 10 MHz using the front panel
controls. See the section titled “Setting the Output Port Frequency” in the
5071A Operating and Programming Manual for instructions on how to do
this.
3 On the HP/Agilent 3585B, perform the following steps:
a) Press the green “INSTR PRESET” button and allow the analyzer
to go through its auto range algorithm (this takes about 5
seconds).
b) Press the “DISP LINE” (display line) button in the marker menu
and adjust the line to 40.0 dBc.
c) Press the “PEAK SEARCH” button and then the “MKR->REF LVL”
button (both are in the marker menu area).
d) Set both the resolution bandwidth (RES BW) and the video
bandwidth (VIDEO BW) to 1 kHz. Enter the 1 kHz values using the
numeric and unit keys. The RES BW and VIDEO BW values are
displayed at the bottom of the screen.
NOTE
The sweep time is 125 seconds. DO NOT adjust the sweep
time manually.
e) Press the “CONT” button in the sweep menu area to begin a new
sweep.
f) When the new sweep has passed through the fundamental
frequency, press the “PEAK SEARCH” button again. Then press
the “OFFSET” and the “ENTER OFFSET” buttons in the marker
menu area. Verify that both the offset frequency (Hz) and the
offset level (dB) go to zero (0 Hz and 0 dB should be displayed at
the top of the screen). If necessary, press and hold the “ENTER
OFFSET” button to zero-out the marker offsets.
g) When at least one sweep has completed, verify that there are no
harmonic signals on or above the 40dBc display line. Use the knob
in the marker area to move the offset marker to any harmonic signal
that you want to measure or record. The marker shows the offset
frequency and level in dBc from the output signal at 5 or 10 MHz.
Verify that there are no harmonically related signals on or above 
40dBc within 5 harmonics of the fundamental.

Symmetricom 5071A Specifications

General

Brand	Symmetricom
Model	5071A
Category	Measuring Instruments
Language	English