User Manual 3153
Using The Instrument 3-24
Computing the sync width in FIXed mode is a bit trickier. In this mode,
the 3153 computes the number of points and the sample clock from the
programmed waveform frequency. Therefore, setting the required sync
width in FIXed mode may take some experimenting until you find the
right value. You can compute the exact number of points from the
equations given on pages 3-26 and 3-27.
The query:
OUTPut:SYNC:WIDTh?
queries the output SYNC width and returns an integer value that is the
value of the SYNC pulse width in points divided by four.
Activating the
Backplane ECLTRG
and TTLTRG Lines
The Model 3153 can receive signals on VXIbus ECLTRG line zero and
TTLTRG lines zero through three. The instrument can also transmit
signals on VXIbus TTLTRG 4 through 6. Note that TTLT lines zero
through 3 and ECLT0 can be used as inputs only while TTLT 4 through
6 can be used as outputs only.
As was mentioned above, the TTLTRG lines zero through three can only
be used as inputs, while TTLTRG lines 4 through 6 can only be used as
outputs.
Use the following command to generate triggers on the backplane using
one or more of the backplane TTLTRG lines:
OUTPut:TTLTrg<n> { OFF | ON}
where <n> designates the activated trigger line 4 through 6. ON enables
the selected trigger line. Note that the trigger validation source for
TTLT<n> is exactly as was set for the SYNC output.
The query:
OUTPut:TTLTrg<n>?
queries the TTLTRG<n> state and returns "<n>,0" (OFF) or "<n>,1"
(ON).
Using the Start and
Stop inputs
Start and Stop inputs are provided at the front panel. The purpose of
these inputs is to allow external intervention with the normal generation
of output waveforms. Figure 3-6 below shows an example of how
waveforms are affected using the start and stop signals.
There is only one set of start and stop inputs. These inputs can be
allocated to channels using the ARM command. In master-slave mode,
and if these inputs were allocated to channel 1, transitions at these
inputs will affect all channels that are slaved to channel 1 automatically.
The start and stop inputs are active after they have been armed.
However, the start signal has no affect on the waveform before applying
the stop signal. After the stop signal has stopped the waveform, the only
signal that will re-start it is the start signal. Trigger signals during the
stop interval are ignored.
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