it will go high momentarily at the end of each Source-1 sweep and
drop low again for the next Source-1 sweep after the Source-2
parameter is incremented. One example application of the Sweep Gate
output is in testing of the attack characteristics of compressors, limiters,
and similar audio processors. With the Sweep Gate connected to the
trigger/gate input of the generator when the BUR-GEN module is
present and the Burst-gated mode is selected, time zero on a time
sweep graph and the start of the signal will be synchronized.
The Channel A/B output, pin 7, goes low whenever analog
analyzer input channel A is selected and high whenever input channel
B is selected. The level at this pin thus indicates which channel is being
measured during a stereo sweep.
The Delay Gate output, pin 1, is similar to the Sweep Gate signal
but with the addition of a user-settable delay time between the actual
beginning of a sweep test and the leading edge of the gate output
signal. This delay time is entered at the bottom of the DCX software
panel, in the Gate Delay field.
An example application is power amplifier turn-on and turn-off
transient (“thump”) testing. The amplifier power could be turned on by
the sweep gate and off by the delayed gate. The output of the amplifier
may be measured during a time sweep. To allow correct capture of
transients, the Level meter should be used along with a fixed input
range.
Another example application is to start a tape machine or turntable
for run-up time testing. The basic measurement technique is to perform
a time sweep while measuring frequency from a pre-recorded tape or
disc. Use of the Delayed Sweep Gate to start the recorder or turntable
permits the instrument to draw the graph when
( is pressed, start the
time sweep, and then start the machine at a predetermined time into
the sweep when the software is ready to take continuous, rapid
measurements.
Description Digital Output
DCX-127 Multifunction Module User’s Guide Page 9
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