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Reference
3-46 GB1400 User Manual
Starting and Stopping Measurements
The following section explains how to start and stop TEST measurements, and
how to initialize or "re-start" WINDOW and TOTALIZE measurements.
The TEST measurement process has two states: started and stopped . In the
started or active state, new "current" results are accumulated while all results
from the previous TEST interval are saved in memory. In the stopped state, all
current results are frozen so that in effect the results from the last two TEST
intervals are saved in memory.
You can tell whether the current TEST process is started or stopped by observing
the TEST character (T, U, or R) in the display. If the displayed TEST character
(in front of the BER result) is blinking, then the TEST process is stopped and
current results are frozen. On the other hand, if the TEST character is not
blinking, that is if it is on steady, then the current TEST process is started and
new results are accumulating.
You can start and stop TEST measurements as follows:
Procedure for Starting the TEST Measurement Process
1. Configure your Analyzer and Generator as desired. In particular, select a
TEST timing mode: Timed, Untimed, or Repeat.
2. Use the DISPLAY SELECT key to set the display mode to TEST. Verify
that the expected TEST character (T, U, or R) is shown.
3 If the TEST character is blinking, press the ERROR DETECTION
CLEAR key to stop the TEST process.
3. At this point you may press the ERROR DETECTION CLEAR key to
start a new TEST process at any time. After pressing CLEAR, verify that
the displayed TEST character is no longer blinking. After starting a new
TEST interval you may also reset the bit, phase, and power history
indicators by pressing the ERROR HISTORY CLEAR key.
Regardless of the current TEST timing mode, you can stop an active TEST
process as follows:
Procedure for Stopping the TEST Process
1. Use the DISPLAY SELECT key to set the display mode to TEST. Verify
that the expected TEST character (T, U, or R) is shown.
2 Observe the TEST character.
a. If the character is on steady, then you may stop the current TEST
interval by pressing the ERROR DETECTION CLEAR key.
b. However, if the character is blinking then the TEST process is
already stopped and you should not press the CLEAR key until
you want to start a new TEST interval.
Note that TEST measurement starting and stopping can be controlled manually
or automatically, depending on the selected timing mode. When the Untimed