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National Instruments Corporation
51
NI 5450 Calibration Procedure
18. Acquire a waveform using the niScope Fetch (poly) VI. Select the
Cluster instance of the VI. The first point in the waveform array is the
Measured Negative Trigger Gain
used in step 19.
19. Calculate the error in the trigger accuracy as a percentage of full scale
using the following formula:
where
a
= the
Measured Trigger Offset
b
= the
Range
value listed in Table 15 (NI 5152) or Table 16
(NI 5153/5154) for the current iteration.
Note
: Change the
range value used to 10 V
pp
when the trigger source is set to
NISCOPE_VAL_EXTERNAL
.
c
= the
Measured Positive Trigger Gain
d
= the
Measured Negative Trigger Gain
e
= the
Positive Trigger Level
f
= the
Negative Trigger Level
LabVIEW VI
C/C++ Function Call
Call
niScope_Fetch
with the following
parameter:
vi
: The instrument handle from
niScope_init
timeout
:
2.0
channelList
: The
ChannelList
value
listed in Table 15 (NI 5152) or Table 16
(NI 5153/5154) for the current iteration
numSamples
:
–1
error
a
100
×
b
------------------
c
d
–
e
f
–
-----------
1
–
100
×
2
-----------------------------------------
+
=