National Instruments NI PXI-5922, Руководство пользователя, Страница: 11 / 21

NI 5922 Calibration Procedure | © National Instruments | 11
4. Call
niScope_ConfigureHorizontalTiming
(niScope Configure Horizontal
Timing VI) with the following parameters:
•
minSampleRate :
10,000,000
• minNumPts :
100,000
• refPosition :
50.0
• numRecords :
1
• enforceRealtime :
NISCOPE_VAL_TRUE
5. Call
niScope_InitiateAcquisition
. (niScope Initiate Acquisition VI) with the
following parameter:
•
vi : The instrument handle you obtained from
niScope_init
6. Call
niScope_FetchMeasurement
(niScope Fetch Measurement VI) with the
following parameters:
•
channelList :
"0"
• timeout :
1.0
• scalarMeasFunction :
NISCOPE_VAL_VOLTAGE_AVERAGE
Compare the resulting average voltage to the value listed in the Calibration Test Limits
column or the Published Specifications column in Table 3 that corresponds to the vertical
range used. If the result is within the selected test limit, the device has passed this portion
of the verification.
7. Repeat steps 1 through 6 for each iteration in Table 3.
8. Repeat steps 1 through 7 for channel 1, changing the value of the channelList parameter
from
"0"
to
"1"
.
Noise
Complete the following steps to verify noise performance of the NI 5922. You must verify both
channels and each iteration listed in Table 4.
1.
Disconnect all cabling from the BNC inputs of the NI 5922. No input signal is needed
because the NI 5922 internal 50
Ω resistor connects the input to ground.
2. Call
niScope_ConfigureChanCharacteristics
(niScope Configure Chan
Characteristics VI) with the following parameters:
•
channelList :
"0"
• inputImpedance :
NISCOPE_VAL_50_OHM
• maxInputFrequency :
0
Table 3. NI 5922 Vertical Offset Calibration
Iteration Range (V)
Calibration Test
Limits (V)
Published
Specifications (V)
1 2 ±26 µV ±50 µV
2 10 ±48 µV ±100 µV