Agilent Technologies 83491, Руководство пользователя

Страница: 26 / 68

2-12
Operation
To Compensate for Module Insertion Loss
To Compensate for Module Insertion Loss
The following steps allow you to enter an offset to compensate for the inser-
tion loss of the clock recovery module. This provides accurate amplitude mea-
surements at the input to the clock recovery module.
1 Disconnect the cable from the clock recovery module’s
Input
connector.
2 Measure the signal using a power meter. You can use either the
Agilent 83480A’s built-in power meter or an external power meter.
3 Reconnect the cable to the clock recovery module.
4 Disconnect the cable from the reference receiver module’s input connector.
5 Measure the signal using a power meter. You can use either the
Agilent 83480A’s built-in power meter or an external power meter.
6 Subtract the two measurements to determine the insertion loss of the module.
Insertion loss: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________
7 On the reference receiver module , press the front-panel channel
SETUP
key.
8 Press
External scale
, and set the
Atten units
to “decibel”.
9 Press
Attenuation
, and enter the value calculated in Step 6 .
book.book Page 12 Monday, January 7, 2002 2:12 PM