Publication No. 980935 Rev. A
3152B User Manual
but will not allow triggers from any other sources.
TTLT0-7
– Enables one or more backplane trigger lines. Note that
the 3152B can receive triggers from more than one TTLTrg line, but
will not accept triggers from bus, external, or internal trigger
sources.
ECLT1
– Enables the ECLTrg1 input and will allow trigger events
from this backplane line.
Trigger Parameters
Gated Mode:
There are two modes that define how the 3152B will
gate. The standard mode is Level, in which a trigger signal below
the threshold level disables the output, and a trigger signal above
the threshold level enables the output. The other mode is
Transition, in which each transition toggles the gate on or off. The
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 internal trigger timer is
programmed in units of seconds. Note that the internal trigger
generator function is available in Pulse mode only. Other output
functions use the re-trigger generator, which has a meaning
different from that of the internal trigger period. Information on the
Re-trigger mode is given in Chapter 3.
Trigger 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.
Manual Trigger
The 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.
Standard
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
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