NI PXIe-4339 Calibration Procedure
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© National Instruments
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9
Figure 3 shows the CH0/CH1 channel pair with CH0 configured for ratio mode verification and
CH1 configured to measure CH0 excitation voltage.
Figure 3.
Ratio Mode Accuracy Verification
Complete the following steps to verify the ratio mode accuracy of the NI PXIe-4339.
1.
Set the calibrator to standby mode (STBY).
2.
Connect the calibrator to the TB-4339/B/C as shown in Figure 2.
•
If the calibrator has a guard connection, leave it disconnected.
•
If the calibrator output is floating, you must connect the negative output to AIGND.
3.
Set the calibrator voltage output to 0 V.
4.
Set the calibrator to operate mode (OPR) to enable output.
x1, x20,
x50, x100
EX1+
EX1–
EX0+
I/O
Connector
R
S
0+
AI0+
R
S
0–
EX0–
AI0–
Progr
a
mm
ab
le
Excit
a
tion
G
a
in=1
or 0.25
An
a
log
Anti-Ali
as
Filter
G
a
in = 0.25
ADC
Reference
Inp
u
t
2.5 V
+
–
EX1+
R
S
1+
AI1+
R
S
1–
EX1–
AI1–
Progr
a
mm
ab
le
Excit
a
tion
G
a
in=1
or 0.25
x1, x20,
x50, x100
An
a
log
Anti-Ali
as
Filter
G
a
in = 0.25
ADC
Reference
Inp
u
t
2.5 V
+
–
EX0+
EX0–
CH1
CH0
V
ref
+
–
