HP 4934A User Manual

10 Alternatively, to connect the HP 4934A receiver to the line, press RCV HOLD
then REVERSE. You can now receive test signals from the line. To re-establish
the speech path, press REVERSE. To drop the line, press RCV HOLD.
Level and Frequency
Principles
LEVEL/FREQUENCY encompasses 4 related measurements: loss, attenua¬
tion distortion, gain slope and frequency. All use the same measurement
configuration.
1004 Hz Loss
This measurement is used to determine the point-to-point loss (or gain) of a
channel at 1004 Hz. 1004 Hz is transmitted instead of 1000 Hz to avoid mea¬
surement errors caused by signals which are submultiples of the 8 kHz PCM
sample rate.
1 The transmitter sends 1004 Hz at the nominal data level (usually -13 dBmO).
2 The receiver measures the level and frequency of the received signal. The loss is
the difference between the transmitted and received levels.
N OTE If the channel is already terminated, the receiver can measure the level via a high
impedance input (bridging mode).
Making Measurements 2-5

HP 4934A Specifications

General

Brand	HP
Model	4934A
Category	Measuring Instruments
Language	English