User manual

Publication No. 980935 Rev. M 3152B User Manual
Astronics Test Systems ArbConnection 4-9
Trigger Parameters
Gated Mode: There are two modes
that define how the 3152B will
gate. The standard mode is Level, in which a
selectable level (high
or low) on the trigger signal enables the output. The other mode is
Transition, in which each transition toggles the gate on or off. The
level or transition direction is programmable
using the Slope
options.
Slope: If you click on “Pos”, the instrument triggers on the positive-
going (rising) edge of the trigger signal. Similarly
, if you click on
“Neg”, the instrument will trigger on the negative-going (falling)
edge of the trigger signal. Note that this affects only
the signals that
are accepted from the front panel trigger input.
Burst: Programs the burst counter for burst mode.
Once triggered,
the 3152B outputs a series of output waveforms that ends when the
burst counter reaches the specified count.
Timer: The Timer button lets you set the trigger period of the free-
running internal trigger generator. The inter
nal trigger timer is
programmed in units of seconds. Note that the internal trigger
generator function is available in P
ulse mode only. Other output
functions use the re-trigger generator, which has a meaning
different from that of the internal trigger per
iod. Information on the
Re-trigger mode is given in Chapter 3.
85BTrigger Level: Programs the trigger level parameter. Depending on
the slope setting, the 3152B will be triggered
to output waveforms
when the trigger level threshold has been crossed.
86BManual Trigger
87BThe TRIG button operates only
in conjunction with the BUS mode.
Press the TRIG button to trigger
the instrument as if an external
trigger has been applied.
23BStandard
The Standard Waveforms Panel (Figure 4-7)
, is accessible after
you click on the Standard button in the Panels bar.
The Standard
Waveform Panel groups allow adjustment of
channel control,
parameters, 10 MHz reference, and waveforms.
The functional
groups in the Standard Waveforms panel are described below.
General Parameters
The General Parameters group has controls for
Amplitude and
Offset. The values you set in this panel may
be duplicated on other
panels, so whenever
you change amplitude and offset in the
Parameters group, the other panels update automatically.
To access the required
parameter, click on the parameter name.
The indicator next to the required parameter highlights.
The digital
display then shows the value associated with the highlighted
indicator. Use the dial, keyboard, or the [↑] [↓
} keys to adjust the
reading to the required setting. After you modify the reading, click
on the Modify/Execute knob
to update the 3152B with the new
reading.