AMERITEC AM-48 - Idle Channel Impulse Noise

AM-48 Test Set (18-0015) Measurements
0015-S08
8
-
9
Gain Slope Using <REL> Measure .
1. Start with Switch 2 of near end AM-48 to <ABS>.
2. Read the level at the near end of the line while the far end
AM-48 is in SEND 3TONE (SLOPE
for AM-48E).
3. Note the lowest absolute reading.
4. Set Switch 2 to <REL> when the display shows the lowest
absolute reading.
5. The display will initially read zero, and all subsequent readings
will be in DB REL,
relative to the lowest absolute reading.
8.9 Idle Channel Impulse Noise
This is a timed study that counts the number of noise pulses that
exceed each of three levels (thresholds). No Holding Tone is used
for this test. The constraints of the test are first set up and then the
test is run.
Information concerning the idle channel impulse noise test
1. Three (3) noise thresholds are established>
low , middle , and
high levels, with an equal interval between them, called the
delta .
2. The time over which the run is to be made is set, called the
duration .
3. The run is started, and a running count is kept of the number of
noise pulses that exceed each threshold.
4. The run will automatically stop when the duration time is
reached, or the test can be manually stopped at any previous
time.
5. A blanking interval is set, during which time the noise pulse
counter does not count.