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21
Horizontal Process Variables
The following table lists the PVs for the horizontal (time-axis) settings for the waveform
acquisition. These PVs configure the common horizontal settings of all input channels.
Process
Variable
Type
Values
Description
setHorzPoints
getHorzPoints
longout
longin
10 to max, Varies
by model, See
Instrument Manual
Number of points in waveform
setHorzTime
getHorzTime
ao
ai
Varies by model,
See Instrument
Manual
Waveform sweep time (acquisition window)
setHorzRef
getHorzRef
ao
ai
0.0 to 1.0
Trigger location in acquisition window:
0.0 to 1.0, where 0.0 corresponds to left-most
trigger location in acquisition window and 1.0,
the right-most.
setHorzOffset
getHorzOffset
ao
ai
-pre-trigger time to
100
Time offset in seconds for trigger from
selected trigger location offset reference:
Pre-trigger: 0 to 100% of acquisition time,
Post-trigger: 0 to 100 seconds
HorzRate
ai
Varies by model,
See Instrument
Manual
Read back for sample rate setting, based on
the configured sweep time and sweep points.
HorzInterval
ai
Varies by model,
See Instrument
Manual
Readback for sample interval setting, equal to
1/sample rate.
setHorzRefOsc
getHorzRefOsc
mbbo
mbbi
Discrete
Sets or queries the source for the reference
clock providing the instrument time base.
“INT” = internal
“EXT” = external input
“CLK10” = clock 10 / backplane
HorzRefFreq ai
9,999,000
to
10,001,000
Reference oscillator frequency relative to
internal reference frequency upon power-on
self test