![background image](http://html.mh-extra.com/html/national-instruments/5124/5124_calibration-procedure_710197032.webp)
NI 5122/5124 Calibration Procedure
32
ni.com
Note
If the digitizer passed the entire verification procedure within the calibration test
limits and you do not want to perform an adjustment, you can update the calibration date
and onboard calibration temperature without making any adjustments by completing
only
steps 3 and 10 in this section.
Complete all of the following steps to externally adjust the NI 5122/5124.
1.
Connect the calibrator to the NI 5122/5124.
♦
If you are using a Fluke 9500B/Wavetek 9500 calibrator:
a.
Using a BNC cable, connect REF FREQUENCY OUTPUT on the
back of the calibrator to the channel 0 input of the digitizer. Make
sure the output of the reference frequency is enabled and set to
10 MHz.
b.
Connect the calibrator test head directly to the channel 1 input of
the digitizer.
c.
Configure the calibrator to output an exact 4 V DC signal into a
1 M
Ω
load impedance.
♦
If you are using a calibrator other than a Fluke9500B/Wavetek 9500:
a.
Connect a 10 MHz, 1 V
pp
sine or square wave source to channel 0.
b.
Connect the oscilloscope calibrator DC source to channel 1.
c.
Configure the calibrator to output an exact 4 V DC signal into a
1 M
Ω
load impedance (channel 1).
2.
Wait 2,750 ms for the impedance matching of the calibrator to settle.
3.
Call
niScope_CalStart
(niScope Cal Start VI) using the user
password. The factory default password for the NI 5122/5124 is
NI
.
4.
Call
niScope_CalAdjustVCXO
(niScope Cal Adjust VCXO VI)
with the following parameter:
•
stimulusFreq
:
10,000,000
Note
The 10 MHz stimulus is automatically taken from channel 0.
5.
Call
niScope_CalAdjustRange
(niScope Cal Adjust Range VI)
with the following parameters:
•
channelName
:
"1"
•
range
:
0
•
stimulus
:
4.0
6.
Configure the calibrator to ground its output at channel 1.