BNC-2120 Installation Guide
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© National Instruments
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3
Figure 1.
BNC-2120 Front Panel
1
RES/BNC Switch (AI 3)
2
Resistor Measurement
Screw Terminals
3
Thermocouple Input
Connector
4
Temperature Reference
5
BNC/Temp. Ref. Switch (AI 0)
6
BNC/Thermocouple
Switch (AI 1)
7
Analog Input BNC
Connectors
8
FS/GS Switches
9
Analog Output BNC
Connector
10 Frequency Range Selection
Switch
11 Sine/Triangle BNC Connector
12 TTL Square Wave BNC
Connector
13 Sine/Triangle Waveform
Switch
14 Frequency Adjust Knob
15 Amplitude Adjust Knob
16 Digital I/O Screw Terminals
17 Digital I/O LEDs
18 User-Defined Screw Terminals
19 User-Defined BNC
Connectors
20 Timing I/O Screw Terminals
21 Quadrature Encoder Screw
Terminals
22 Quadrature Encoder Knob
23 Timing I/O BNC Connector
24 Power Indicator LED
E
L
R
T
T
S
N
I
NA
M
U
N
O
I
A
S
T
N
_
+
Floating
Source (FS)
_ +
Ground Ref.
Source (GS)
AO
ANALOG OUTPUTS
ANALOG INPUTS
DIGITAL I/O
FUNCTION GENERATOR
Frequency Selection
Amplitude Adjust
Sine / Triangle
TTL Square Wave
Frequency Adjust
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
AI 0
AI 1
USER 1
USER 2
P0.7
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
D GND
AI 2
BNC
RES+
AI GND
AI SENSE
RES-
1
2
3
4
Temp.
Ref.
0.1-10 kHz
LO
HI
LO
HI
1-100 kHz
13-1000 kHz
Thermo
couple
BNC
RE
S
AI 3
BNC
AI 3
AI 4
AI 5
AI 6
AI 7
AO 0
AO 1
USER-DEFINED
SIGNALS*
*For BNC connections, wire
any Timing I/O or Digital I/O
screw terminals here.
PWR
BNC-2120
TIMING I/O
PFI 0 / P1.0
96 Pulses / Rev
Quadrature
Encoder
PFI 1 / P1.1
PFI 2 / P1.2
PFI 3 / P1.3
PFI 4 / P1.4
PFI 5 / P1.5
PFI 6 / P1.6
PFI 7 / P1.7
PFI 8 / P2.0
PFI 9 / P2.1
PFI 12 / P2.4
PFI 13 / P2.5
PFI 14 / P2.6
+5 V
PULSES
UP / DN
D GND
1.
2.
3.
4
.
!
10
16
17
1
5
7
9
8
4
6
2
12
14
1
3
11
15
19
20
2
3
22
24
21
3
1
8
