14. Residual Responses Test

Figure 2-24. Residual Responses Measurement

9.Press SWEEP [SINGLE_) and wait for completion of sweep. Look for any residual responses at or above the display line. If a residual is suspected, press SWEEP CRINGLE) again and see if the response persists. A residual will persist on repeated sweeps, but a noise peak will not. Any residual responses must be c-105 dBm.

Option 400:

Any residual 500 Hz to 2.5 kHz must be c-95 dBm; any residuals >2.5 kHz must be c-105 dBm

10.If a response appears marginal, do the following to determine whether or not it exceeds the specification.

a.Press ISAVE_) 0.

b.Press MARKER [NORMAL) and place the marker on the peak of the response in question.

c.Press MARKER Ijj), then activate SWEEP m.

d.Reduce [FREQUENCY SPAN] to 1 MHz or less. The amplitude of the response should be c-105 dBm (below the display line).

e.Press (RECALL] (iJ to resume the search for residuals.

11.Step [CENTER FREQUENCY) to 1510 MHz with @) checking for residual responses at each step by the procedure of steps 9 and

10.There should be no residual responses at or above the display line below 1500 MHz.

Maximum Residual Response

dBm

MHz

2 - 46 Performance Tests