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NI PXIe-4154 Calibration Procedure
3.
Connect the resistors to the and Output - terminals on the NI PXIe-4154, as shown
in Figure 8. Connect the remote sense leads directly across the 200
Ω
resistor (R
2
).
4.
Set the voltage level and current limit to the values listed in Table 12.
5.
Measure the Lead Drop with a DMM (
HI Lead Drop
) from the terminal
of the NI PXIe-4154 to the 200
Ω
resistor, as shown in Figure 8.
6.
Measure the load voltage with a DMM (
Load Voltage
) across the 200
Ω
resistor where the
sense leads connect, as shown in Figure 8.
7.
Calculate the accuracy limit for the load voltage using the following equations and the
V Level listed in Table 12, where
V Level
and
HI Lead Drop
are given in volts.
The test passes if the
Load Voltage
measurement falls within the calculated
Load Voltage Limit
.
Transient Response Verification (Channel 0 Only)
To verify the transient sense of an NI PXIe-4154, use a digital oscilloscope and a programmable
electronic load with dynamic current capability. Transient response validation should be
performed only after successfully validating the voltage and current measurement accuracy and
the load regulation.
Note
Use one 3-foot, 18 AWG twisted-pair cable to connect and Output -
to the electronic load, and another 3-foot, 18 AWG twisted-pair cable to connect
Sense + and Sense - to the electronic load. To ensure signal integrity, the cable shields
should be terminated to the ground. Refer to Figure 1 for a connection diagram.
Complete the following steps to verify transient response.
1.
Ensure that
Remote Sense
is
ON
.
2.
To verify Channel 0
FAST
transient response, connect a digital oscilloscope and electronic
load to an NI PXIe-4154. Refer to the following figure for a connection diagram.
Table 11.
Load Voltage Equations
Channel
Equation
Channel 0
V Level
± [(
V Level *
0.04%
+
0.005) + (
HI Lead Drop * 0.002
)] V
Channel 1
V Level
± [(
V Level * 0.04%
+
0.006
) + (
HI Lead Drop * 0.002
)] V
Table 12.
NI PXIe-4154 Remote Sense Output Verification Points
Channel
V Range
I Range
V Level
I Limit
Measured
Load
Voltage
Limit (V)
HI Lead
Drop (V)
Load
Voltage (V)
0
6 V
3 A
6 V
0.1 A
1
8 V
1.5 A
8 V
0.1 A
