Symmetricom 5071A, Operating And Programming Manual

Page: 177 / 194

Appendix A Performance Tests
5071A Complete Performance Tests
Operating and Programming Manual 149
When at least one sweep has completed, verify that there are no spurious signals
on or above the -80 dBc display line. Use the knob in the marker area to move
the offset marker to any spurious 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.
g. Verify that one of the following conditions is true:
1. No spurious signals are on or above the -80 dBc display line between 4
MHz and 6 MHz for the 5 MHz output, or
2. No spurious signals are on or above the -80 dBc display line between 9
MHz and 11 MHz for the 10 MHz output.
4 On the 5071A, set output ports 1 and 2 to 5 MHz using the front-panel controls.
5 Repeat step 3.
6 Connect 5071A Port 2 to the 3585B Spectrum Analyzer and repeat steps 2
through 5 to test Port 2.
7 Record the actual reading in the appropriate place in the Performance Test
Record.
C. Harmonic Distortion Check for the 1 MHz Output
Harmonics on the 1 MHz output signal must be more than 40 dBc below the
fundamental. To perform this check, a spectrum analyzer is tuned to the
fundamental frequency and an amplitude reference is established. The output
frequency spectrum is then examined to determine the fundamental-to-sideband
amplitude relationship at harmonic points of the fundamental.
Equipment
HP/Agilent 3585B Spectrum Analyzer
Setup
Figure A-5. 1MHz Output Harmonics Distortion Test Setup
Specifications
All harmonics must be < -40 dBc with respect to the fundamental frequency.