HP 86037B, Instruction Manual

Page: 62 / 204

3-6
Normalization
Verifying a Test Setup Normalization
Verifying a Test Setup Normalization
Before a measurement session, it is a good idea to verify the current normal-
ization. Verification does not need to be performed before each measurement.
1 Connect the appropriate normalization device, such as a short fiber-optic cable,
between the
SOURCE OUTPUT
and
RECEIVER INPUT
connectors.
C A U T I O N Use fiber-optic patch cords to connect the test set SOURCE OUTPUT and RECEIVER
INPUT to either a device being tested or a short test cable to protect the test set
fiber connectors from undue and unnecessary wear.
2 Select the desired normalization file in the normalization menu. Enter its
number in the
Norm File:
box or select it from the drop-down list.
Figure 3-1. Normalization File Section of the Main Window
3 Click
Verify Normalization
. The system performs a modulator bias adjustment.
Then it measure ten group delay points in the measurement span and checks
the maximum group delay against the limit set in the
Normalization Settings
window of the
SetParametersFor
menu.
On completing the verification, a message tindicates if the normalization veri-
fication has passed or failed. It also shows the maximum group delay value
obtained during the verification. The system group delay noise floor can vary
between 0.05 ps and 2 ps. You can set the limits by selecting
Normalization
in the
SetParametersFor
menu.