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 National Instruments Corporation

3

BNC-9920 Operating Instructions and Specifications

Figure 1.  

BNC-9920 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 

(DIO 0–7)

17 Digital I/O LEDs

18 User-Defined Screw Terminals
19 User-Defined BNC Connectors
20 Digital I/O Screw Terminals 

(DIO 9–20)

21 Quadrature Encoder Screw 

Terminals

22 Quadrature Encoder Knob
23 Digital I/O BNC Connector (DIO 8)
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

DIO 7

DIO 6

DIO 5

DIO 4

DIO 3

DIO 2

DIO 1

DIO 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 Digital I/O
screw terminals here.

PWR

BNC-9920

DIGITAL I/O

DIO 8

96 Pulses / Rev

Quadrature

Encoder

DIO 9

DIO 10 

DIO 11 

DIO 12

DIO 13 

DIO 14

DIO 15 

DIO 16

DIO 17 

DIO 18

DIO 19

DIO 20

+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

Summary of Contents for BNC-9920

Page 1: ...defined BNC connectors A function generator with the following outputs Frequency adjustable TTL compatible square wave Frequency and amplitude adjustable sine wave or triangle wave Quadrature encoder...

Page 2: ...as menu items and dialog box options Bold text also denotes parameter names italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept Italic text also denote...

Page 3: ...rew Terminals 22 Quadrature Encoder Knob 23 Digital I O BNC Connector DIO 8 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 AN...

Page 4: ...the labels 4 Connect the power end of the BNC 9920 cable to the external power supply shipped with the CompactRIO Starter Kit The power indicator LED shown in Figure 1 lights If it does not light chec...

Page 5: ...e signal sources Measuring Floating Signals To measure floating signal sources move the corresponding switch below the BNC connector to the FS position In the floating source switch position the negat...

Page 6: ...programming mode unconnected channels can cause noise on other channels In order to avoid noisy thermocouple measurements move the BNC Temp Ref switch on the BNC 9920 to the Temp Ref position For more...

Page 7: ...always present at the TTL Square Wave BNC To adjust the frequency of the function generator select your frequency range using the Frequency Selection switch You can select 0 1 10 kHz 1 100 kHz or 13 1...

Page 8: ...n in Table 1 Using the Quadrature Encoder The BNC 9920 contains a mechanical quadrature encoder circuit that produces 96 pulses per encoder revolution Two outputs PULSES and UP DN are at the screw ter...

Page 9: ...ules Note Refer to the documents shipped with the C Series modules for specifications about analog and digital I O signals Analog Input Number of channels default 8 differential Field connections defa...

Page 10: ...requency range 100 Hz to 1 MHz Frequency adjust Through the Frequency Adjust knob Rise time 250 ns Fall time 50 ns Sine triangle wave Frequency range 100 Hz to 1 MHz Frequency adjust Through the Frequ...

Page 11: ...t 1 040 g 2 lb 4 7 oz I O connector 68 pin male SCSI II type BNC connectors 15 Screw terminal plugs 31 Environment Operating temperature 0 to 50 C Storage temperature 55 to 125 C Relative humidity 5 t...

Page 12: ...ck the appropriate link in the Certification column Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner NI recognizes that elimina...

Page 13: ...support needs For telephone support in the United States create a service request at ni com support and follow the calling instructions or dial 512 795 8248 For telephone support outside the Untied S...

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