Introduction (18-0015) AM-48 Test Set
0015-S011-10
Characteristic Specification
Transients
(cont.)
Gain hit threshold can be 2, 3, 4, or 6 dB. A gain hit will be
counted if the level of the holding tone changes up or down
by more than the threshold for at least 4 ms ±.5 ms. A
blanking interval, that is user-set from 1 to 255 ms, blocks
further counting of gain hits.
Phase hit threshold can be 5 to 45 degrees in 1 degree
steps, with an accuracy of ±.5 degrees ±10% of the setting.
A phase hit will be counted if the phase of the holding tone
changes by more than the threshold fro at least 4 ms ±.5
ms. A blanking interval, that is user-set from 1 to 255 ms,
blocks further counting of phase hits.
The three-level impulse noise low threshold can be set from
30 to 110 dBrn with threshold differences of 2, 3, 4, or 6 dB.
Threshold accuracy: ±1 dB. An independent blanking
interval for each threshold, user-set from 1 to 255 ms,
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 set to 0 for a
continuous study.
Each transient has a count capacity of 0-9999.
Filters same as noise.
Damping A damp mode reduces the display update rate from
approximately 4 times/second to approximately 2
times/second for reading widely fluctuating measurements.
The same switch, when in <DAMP> position, also changes
the monitoring point of the receive (RCV) monitor speaker
to the output of the auto-range amplifier (significantly
increasing the speaker level).
Term/Bridge When in terminate, the receiver terminates the line in the
selected impedance. When in bridge, the line is bridged by
a high impedance, causing no more than .2 dB loss on a
600 ohm line.
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