CBLé System Guidebook 43
Trigger Threshold (Continued)
Hardware Trigger Threshold: Hardware triggering is selected by
either of the following:
¦ Trigger Channel in
CMD3
is set to 21 (
DIG IN
), and External Clock
Source in
CMD3
is set to 1.
¦ Operation 5 (Period) or 6 (Frequency) is selected in
CMD1
and
Trigger Type selected in
CMD3
is 0, 1, 2, 3, 4, 5, or 1nnnn (Digital
nibble). (Refer to pages 71–72.)
Note: Rising-edge polarity is selected automatically when Trigger Type
is 0, 1, or 1nnnn.
Software Trigger Threshold: The threshold is a “software” value that
is converted to an analog-to-digital converter value for determining the
trigger event. Software triggering is selected by the following (all are
required):
¦ Trigger Channel is set to 1, 2, or 3.
¦ Trigger Type is set to 2, 3, 4, or 5.
¦ Period or Frequency operation is not selected.
Note: If an external clock is used with a software trigger, the hardware
threshold for External Clock Source = 1 is set to 1 Volt.
Prestore Data Percentage (%)
This parameter selects the percentage of the number of samples to
collect before the trigger condition is met. (Default:
0
) (Refer to
“Triggering with Prestore Reference Information” in Appendix A.)
0
–100 Percentage (integer value) of samples to collect.
For example, a prestore data value of 10 results in 10% of the data being
collected before triggering and 90% of the data being collected after
triggering.
Note: This parameter is ignored if Post-Processing is 3 (Statistics) in
CMD1
.
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