National Instruments PXIe-4467 - Page 14

Figure 6. PXIe-446x Input Connection in Pseudodierential Mode
DUT
+
–
AI
210 pF
+
–
50 Ω
1 M Ω
The following figure shows the PXIe-446x analog input circuitry block diagram.
Depending on the connector type, connect the signals as shown in the inset.
Figure 7. PXIe-446x Analog Input Block Diagram
+AI
–AI
Calibration
Multiplexer
50 Ω
GND
0.2 µF
1 G Ω
0.2 µF
1 G Ω
f
c
=
0.8 Hz
1 G Ω
1 G Ω
AC/DC
Coupling
900 k Ω
900 k Ω
100 k Ω
100 k Ω
20 dB
Attenuator
AIGND
Differential
Amplifier
+
–
Analog
Lowpass
Filter
Gain = 0 dB
Gain = 10 dB
Gain = 20 dB
Gain = 30 dB
Gain = 0 dB
Gain = –20 dB
IEPE
On/Off
24 V Compliant IEPE
Constant Current Source
4/10/20 mA
ADC
+AI
–AI
+AI
–AI
+AI
–AI
Mini-XLR ConnectionsBNC Connections
+AI
–AI
Refer to inset
for connection
by connector
type
Analog Output Connections
The following figure shows the PXIe-446x analog output circuitry block diagram.
Depending on the connector type, connect the signals as shown in the inset.
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14
PXIe-4466/4467/4468 Getting Started Guide