HP 11757B Руководство - Страница 39

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Digital Radio Testing

Measurement Setup

Note

Measurement

1-36

1. Press

. This will access a series of

4 MEAS SETUP 5

parameters to enter to set the Fader up for a

measurement.

2. Use the

to display \

495

used with the recovery test to measure the time it

takes to recover to a specied bit error rate. This

is not needed if you are simply using the ALARM

INPUT to measure recovery time. Press

use the

arrow key to toggle through the options:

485

ALARM, 1E-3, 3E-4, 1E-4, 3E-5, 1E-5 and 1E-6.

Unless you have opted to use the ALARM INPUT to

make the measurement, select one of the other criteria

and press

4 ENTER 5

3. If you want to test recovery time when a notch

exists in the IF path (or some other path), press

and use the arrow or data keys to set

4 NOTCH FREQ 5

the notch frequency you want to test at. Then press

and use the arrow or data keys to set

4 NOTCH DEPTH 5

the depth you want to test at.

If you set a depth too deep and have set a bit error rate

criteria for recovery, the radio may not recover. Make

sure that the notch depth and frequency you have chosen

for recovery test is one that would pass on the Static

M-Curve test for the criteria you have set.

You are now ready to make the actual measurement.

Press

. The Fader display will show the recovery

4 MEAS 5

time.

HP 11757B

", which can be

CRITERIA

4 ENTER 5

and