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NI 5122/5124 Calibration Procedure
30
ni.com
5.
Call
niScope_Commit
(niScope Commit VI) with the following
parameter:
•
vi
: The instrument handle you obtained from
niScope_init
6.
Connect the calibrator test head directly to the channel 0 input of the
digitizer. Configure the calibrator to output the signal from Table 12.
7.
Wait 1,500 ms for the calibrator impedance matching and frequency to
settle.
8.
Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
9.
Call
niScope_Fetch
(niScope Multi Fetch VI) with the following
parameters:
•
channelList
:
"0"
•
timeout
:
2.0
•
numSamples
:
–1
If the digitizer does not time out, the digitizer has passed this portion of the
verification. If the digitizer does time out, you must call
niScope_Abort
(niScope Abort VI) to end the acquisition.
10. To verify the trigger sensitivity on channel 1, repeat steps 1 through 9
using the values from Table 12, iterations 5 through 8. Also change
channelList
to
"1"
in steps 1, 2, and 9, and connect the calibrator test
head to channel 1 in step 6.
11. To verify the trigger sensitivity on the external trigger channel, repeat
steps 1 through 9 using the values from Table 12, iterations 9 through
12. Do not change the
channelList
inputs. Connect the calibrator test
head to the external trigger channel (TRIG) in step 6.
You have finished verifying the trigger sensitivity for the NI 5122/5124.
Table 12.
NI 5122/5124 Trigger Sensitivity Inputs
Iteration
Trigger
Source
Level
Slope
Calibrator
NI 5122
NI 5124
1
0
1.25 mV
NISCOPE_VAL_
POSITIVE
4.84 mV
pk-pk
50 MHz sine
wave with 50
Ω
load impedance
4.84 mV
pk-pk
50 MHz sine wave
with 50
Ω
load
impedance
2
0
–1.25 mV
NISCOPE_VAL_
NEGATIVE