Chapter 3
Signal Conditioning
©
National Instruments Corporation
3-11
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.
Figure 3-10.
Attenuator for Use with Single-Ended Inputs
Using the values in Figure 3-9,
(3-5)
or Figure 3-10,
(3-6)
Therefore in either case,
(3-7)
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 k
Ω
R26(D) = 10 k
Ω
C9(E) = 10 k
Ω
+
–
To DAQ
Device
J10
AI 1
R29(C) = 20 k
Ω
J10
AI 1
R49(F) = 10 k
Ω
AI 1
AI GND
AI GND
G
DIFF
10 k
Ω
10 k
Ω
10 k
Ω
10 k
Ω
+
+
-------------------------------------------------------------
1
3
---
=
=
G
SE
10 k
Ω
20 k
Ω
10 k
Ω
+
--------------------------------------
1
3
---
=
=
V
MIO
V
in
1
3
---
⋅
=
