0004-000067
23
Trigger Process Variables
The following table lists the PVs for the trigger settings used to configure the trigger for
the waveform acquisition synchronization. There are individual trigger level settings for
each of the input channels, with
N
designating the appropriate channel number (for
example: TrigLevInp1). The ZT4xx1 has two channels (
N
= 1 to 2) and the ZT4xx2 has
four channels (
N
= 1 to 4).
Process Variable Type Values
Description
setTrigSource
getTrigSource
mbbo
mbbi
Discrete Trigger
source:
“TTLT0” = TTLTRG0 (external header)
“TTLT1” = TTLTRG1 (external header)
“TTLT2” = TTLTRG2 (external header)
“TTLT3” = TTLTRG3 (external header)
“TTLT4” = TTLTRG4 (external header)
“TTLT5” = TTLTRG5 (external header)
“TTLT6” = TTLTRG6 (external header)
“TTLT7” = TTLTRG7 (external header)
“INP1” = input channel 1
“INP2” = input channel 2
“INP3” = input channel 3 (ZT4xx2)
“INP4” = input channel 4 (ZT4xx2)
“EXT” = external input
“MAN” = software only
“PATT” = pattern
setTrigType
getTrigType
mbbo
mbbi
Discrete Trigger
type:
“EDGE” = edge
“IN” = pulse width in
“OUT” = pulse width out
“LTH” = pulse width less than
“GTH” = pulse width greater than
“EQU” = pulse width equal
“NEQ” = pulse width not equal
“GLIT” = glitch
“VID” = video
setTrigMode
getTrigMode
mbbo
mbbi
Discrete
Trigger mode:
“AUTO” = auto-trigger
“NORM” = normal trigger
setTrigSlope
getTrigSlope
mbbo
mbbi
Discrete
Trigger slope or polarity:
“NEG” = negative
“POS” = positive
setTrigLevInp
N
getTrigLevInp
N
ao
ai
(offset –range/2)
to (
range/2)
Trigger level in Volts for an input channel.
The trigger level must be within the vertical range
and offset settings for the corresponding input
channel
setTrigLevExt
getTrigLevExt
ao
ai
-2.0 to 2.0
Trigger level in Volts for the external input trigger
setTrigImpedExt
getTrigImpedExt
ao
ai
50 or 1e6
Input impedance for external input trigger:
50 = 50 Ohm
1e6 = 1 MOhm
