HP 8559A GHz, dBm, Increase TUNING control setting in, Terminate INPUT 5(M2 connector with 50-ohmtermination, NOTE, 4-18.RESIDUAL RESPONSES(Cont'd)

MODEL 8559A PERFORMANCE TESTS

PERFORMANCE TESTS

4-18. RESIDUAL RESPONSES(Cont'd)Terminate INPUT 5(M2 connector with 50-ohm termination.

Adjust TUNING control to position LO feedthroughsignal on leftmost vertical graticule line.

Set RESOLUTION BW control to 10 kHz, leaving FREQ SPAN/DIV set to 10 MHz. Adjust BL CLIP control clockwise until just the peaks of the noise are displayed. Set the SWEEP TRIGGER control to SINGLE and display PERSISTENCE control to MAX.

Set display to WRITE and momentarily press ERASE. Turn SWEEP TRIGGER control clockwise to trigger a single sweep, adjusting BL CLIP and display INTENSITY controls until just the peaks of the noise are displayed. Press ERASE and trigger another sweep.

Set display to VIEW and check for residual responses greater than -90 dBm. Record frequency and amplitude of residual response with the greatest amplitude.

GHzdBm

NOTE

Residual responses are often visible within 10 MHz of the HP 8559A LO feedthrough signal (25 MHz with ALT IF selected). These residual responses are not within the instrument's specifiedfrequency range and should be excluded from considerationin this performancetest.

7.Increase TUNING control setting in 100-MHz increments and use procedure of steps 5- 7 to check for residual responses from 10MHz to 3.060 GHz (25 MHz - 3.060 GHz with ALT IF selected).