HP 4934A User Manual

transmitter is quiet terminated (indicated by a decimal point in the left window
when the display is in the TRMT mode).
RECEIVER
6 Use DISPLAY to select the RCV display mode.
7 Select the required filter using the FILTER key. If you are doing a loopback test,
the filter selection has already been made in the transmitter procedure.
Setting the Impulse Noise Measurement Period
8 Use the PERIOD key to select a timed measurement (5, 15 or 60 minutes) or
nonstop.
Setting the Impulse Noise Threshold
9 Use the Impulse Noise DISPLAY key to select LOW (SET). The current
threshold value will appear in the left window (the THRESH and dBm indicators
will be lit).
10 Use the —, STEP UP and STEP DOWN keys, keys to set the threshold
value.
N OT E If a holding tone exists on the line:
To maintain measurement accuracy, the impulse “low” threshold should be no more
than 25 dB below the holding tone level.
11 Use the Impulse Noise DISPLAY key to display the resulting MID and HIGH
threshold values. These are 4 dB and 8 dB greater than the low threshold value up
to a limit of 109 dBm.
Starting/Stopping the Measurement
12 Press START RESET to set the impulse noise counters to zero (the CNTS and
CNTNG indicators will light) and start the measurement.
13 Use the IMPULSE NOISE DISPLAY key to select TIMER.
If you select a timed measurement (5,15 or 60 minute period) in step 8, when
you press START RESET the time shown in the left window will decrement in
1 minute intervals to zero - the measurement then automatically stops.
If you select NON-STOP in step 8, when you press START RESET the time
starts from zero and increments in one minute intervals. Press STOP to end the
measurement.
Making Measurements 2-19

HP 4934A Specifications

General

Brand	HP
Model	4934A
Category	Measuring Instruments
Language	English