National Instruments BNC-2090A User Manual page 33

© National Instruments Corporation
+
To DAQ
Device
–
Figure 3-9. Attenuator for Use with Differential Inputs
Figure 3-10 shows a resistor circuit for attenuating voltages at the
single-ended inputs of the BNC-2090A. It also shows the placement of the
resistors on the open-component positions for channel 1.
AI 1
Figure 3-10. Attenuator for Use with Single-Ended Inputs
Using the values in Figure 3-9,
G
DIFF
or Figure 3-10,
G
Therefore in either case,
When the DAQ device is configured for ±10 V input signals, the device can
acquire ±30 V signals with this attenuator circuit.
R29(C) = 10 kΩ
C9(E) = 10 kΩ
R26(D) = 10 kΩ
R29(C) = 20 kΩ
R49(F) = 10 kΩ
AI GND
AI GND
10 kΩ
= ------------------------------------------------------------ -
10 kΩ 10 kΩ
+ +
10 kΩ
= ------------------------------------- -
SE
20 kΩ 10 kΩ
+
1
-- - ⋅
V V
=
MIO in
3
3-11
Chapter 3 Signal Conditioning
AI 1
J10
AI 1
J10
1
= -- -
10 kΩ 3
1
= -- -
3
BNC-2090A User Manual
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(3-6)
(3-7)