HP 8568B Manual do Utilizador descarregar pdf (Página 70)

14. Residual Responses Test

10.

11.

Figure 2-24. Residual Responses Measurement

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

If a response appears marginal, do the following to determine

whether or not it exceeds the specification.

a. Press

ISAVE_)

b. Press MARKER

[NORMAL)

and place the marker on the peak of

the response in question.

c. Press MARKER

Ijj),

then activate SWEEP

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.

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

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 312 313

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