3152B User Manual
Publication No. 980935 Rev. A
1-20 Introduction
EADS North America Test and Services
Continuous Mode
In Continuous mode, the 3152B generates the selected waveform
continuously at the selected frequency, amplitude, and offset. The
generator will begin waveform generation as soon as the waveform
and its parameters have been programmed, and will stop only
when turned off or placed in one of the interrupted run modes.
Triggered Mode
In Triggered mode, you may program the trigger circuit to respond
to positive or negative transitions of the trigger input signal. When
triggered, the generator outputs one waveform cycle, and then
remains idle at an amplitude level equal to the voltage of the first
point of the waveform. You may set the instrument to receive
triggers from the front panel connector, backplane, or the trigger
command in your software.
A Re-trigger circuit requires only one trigger event, after which it
automatically generates a series of triggers. In this case, the re-
trigger delay parameter determines the time between waveform
cycles.
The trigger signal, whether it comes from the front panel, VXIbus
trigger line, or a software command, has to pass through electrical
circuits. These circuits cause a small delay known as system delay.
This delay determines the amount of time it will take from a valid
trigger edge to the moment that the output reacts. System delay
cannot be eliminated completely, and must be accounted for when
using a trigger signal.
Gated Mode
In Gated mode, the 3152B circuits will generate an output
waveform as long as a gating signal is present. The instrument can
be programmed to gate on two different signal types. The normal
mode is level sensitive, where the output is enabled only while the
trigger signal is above the trigger level threshold voltage. The
second mode is transition (edge) sensitive, where the gate opens
on the first transition and closes on a subsequent transition.
Regardless of the selected gating mode, the generator always
completes the waveform at the end of the gate and then idles at a
DC level.
Burst Mode
The Burst mode is an extension of the Triggered mode where the
generator is programmed to output a pre-determined number of
waveforms. The sources to trigger a burst are the same as for the
Triggered mode.
Trigger Sources
The 3152B responds to a variety of trigger sources such as the
TRIG/PLL connector, backplane trigger lines (TTLTrg0-7), and a
software trigger. There are also two built-in, self generating trigger
generators. One repeats itself at pre-programmed intervals from
100
μ
s to 20 seconds. The other has a programmable delay time.
The re-trigger delay is measured from the end of the signal to the
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