CBLé System Guidebook 41
Trigger Type (Continued)
For Trigger Types 2 through 5, data collection begins when the input
signal changes with respect to Trigger Threshold values—from below to
above the value for Trigger Types 2 or 4, and from above to below the
value for Trigger Types 3 or 5.
The selected Trigger Type also specifies the edge polarity that is used
during period and frequency measurements. Trigger Types 4 and 5 are
used for measuring the waveform pulse-width between rising and falling
edges (see page 72).
2
3
4
5
6
1nnnn
Rising edge to rising edge (+ +).
Falling edge to falling edge (N N).
Rising edge to falling edge (+ N).
Falling edge to rising edge (N +).
Note: For Trigger Types 2 through 5, see also “Software Triggering”
on page 71 or “Measuring Period and Frequency” on page 72.
Manual and Sample.
Lets you collect one sample at a time each time N is pressed.
(Note that when Trigger Type is 6, the Sample Time parameter is
ignored.)
Digital nibble on Channel 21 (
DIG IN
), where n=0 or n=1 is the desired
data value, and n=2–9 indicates a “do not care” for that bit. (Refer to
Digitial Nibble in the Glossary, if necessary.)
Note: This selection for Trigger Type automatically selects
CH21
as
the trigger channel regardless of the value entered for Trigger
Channel (see below).
Trigger Channel
This parameter lets you select the active channel that detects the
selected trigger type (Trigger Type must be 2–5). This channel must have
been selected in
CMD1
. (Default:
1
)
0
1
2
3
21
n/a
Triggers on
CH1
Triggers on
CH2
Triggers on
CH3
Triggers on an external clock signal. This trigger can be one of
two physical signals that is determined by the External Clock
Source parameter (page 44).
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