HP 4934A User Manual

6 TRMT selects the transmitter source impedance.
7 RCV selects the receiver terminating impedance or, in bridged mode, selects the
impedance of the circuit under test.
8 REVERSE interchanges the TRMT and RCV function of the two 310 ports. The
indicators above the ports show the current function.
9 DISPLAY selects either the received or transmitted parameters for display. The
TRMT and RCV indicators above the DISPLAY key show which parameters are
being displayed.
10 ME AS selects the following measurements;
LEVEL FREQ (level frequency measurements)
NOISE (noise measurements)
NOISE W TONE (noise with tone measurements)
SIG TO NOISE (signal-to-noise measurements)
IMPULSE NOISE (impulse noise measurements)
P/AR (peak to average ratio measurements)
N.T. GND (noise to ground measurements)
11 OUTPUT LEVEL sets the transmitter output level.
12 LEVEL ZERO allows relative level measurements in the LEVEL FREQ mode.
The displayed received signal becomes the 0 dB reference when you press
LEVEL ZERO. All subsequent results are relative to this reference. The
displayed results are a measure of loss, that is a higher level than the reference is
indicated by a sign. This is standard in the telephone industry.
13 SF SKIP prevents the instrument from transmitting signaling frequencies in the
range 2600 Hz ±150 Hz. If SF SKIP is enabled the instrument automatically
prevents the selection of frequencies in this range. You can also change the SF
SJQP center frequency, see Page 2-9.
14 STEP UP, STEP DOWN, — > and change the transmit frequency value in
the LEVEL FREQ mode or the low threshold in the IMPULSE NOISE mode.
Use —> and <— to select the digit to change. The selected digit is highlighted
by a lit pointer. Change the value of the selected digit using the STEP UP and
STEP DOWN keys.
15 PERIOD selects one of the four Impulse Noise measurement periods.
16 DISPLAY displays the Impulse Noise measurement time or threshold/count
values. Only the LOW (SET) threshold value can be changed, see Page 2-20.
17 STOP allows the Impulse Noise measurement to be stopped without affecting the
Impulse Noise counter.
Getting Started 1-3

HP 4934A Specifications

General

Brand	HP
Model	4934A
Category	Measuring Instruments
Language	English