AM-48 Test Set (18-0015) Introduction
0015-S01
1-
Characteristic Specification
Amplitude Jitter Displays the incidental amplitude modulation of a holding
tone. The holding tone must be -40 to +10 dBm, 990 to
1030 Hz. Amplitude jitter is displayed from 0.0 to 25.0%
with a resolution of .1% and an accuracy of ±.2%, ±5% of
reading.
Weighting filter selection: 20-300 Hz or 4-300 Hz.
Phase Jitter Displays the incidental phase modulation of a holding tone.
The holding tone must be -40 to +10 dBm, 990 to 1030 Hz.
Phase jitter is displayed in degrees from 0.0 to 25.0
degrees with a resolution of .1 degree and an accuracy of
±.2 degree, ±5% of reading.
Weighting filter selection: 20-300 Hz or 4-300 Hz.
Impulse Noise Three (3) noise thresholds are established: Low, Middle,
and High levels, with an equal interval between them called
the Delta. The maximum High threshold is 105 dBrn for
600 ohm impedance (or 104 dBrn for 900 ohm). The
minimum Low threshold is 30 dBrn. Delta can be 2, 3, 4, or
6 dB. Threshold accuracy: ±1 dB. A user-selected
blanking interval of 1 to 255 ms for each threshold, blocks
further counting of impulses at that threshold.
The study duration timer may be set from .1 minute to
1999.9 minutes in .1 minute steps, or continuous. Each
threshold has a count capacity of 0-9999. Weighting filters
same as noise.
Transients Counts dropouts, gain hits, phase hits, and 3-level impulse
noise with tone. Holding tone must be -40 to +10 dBm, 995
to 1025 Hz
Dropout threshold is -12 dB from the initial level of the
holding tone. A dropout will be counted if the holding tone
drops below the threshold for at least 4 ms ±.5 ms.
Counting of dropouts, gain hits, phase hits, and impulses is
inhibited for a blanking interval which lasts until 1 second
after the holding tone is restored to a level above the
dropout threshold.
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