National Instruments BNC-2121 Page 18 User Manual Download | Manualshive

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© 2001–2003 National Instruments Corp. All rights reserved.

322640C-01

Jun03

*322640C-01*

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Summary of Contents for BNC-2121

Page 1: ...ctor accessory for testing or for performing counter applications For specific information about using a 660X device refer to the 660X User Manual What You Need to Get Started You need the following items to install and use the BNC 2121 connector accessory BNC 2121 connector accessory BNC 2121 Connector Accessory for 660X Devices User Guide 660X device 660X User Manual 68 position cable such as th...

Page 2: ...connector on the BNC 2121 as shown in Figure 1 Figure 1 Connecting a BNC 2121 to a 660X Device Note If the power LED indicator does not light up check the cable connections to make sure the cable is connected securely Connecting Signals to the BNC 2121 Connect signals using the spring terminals or BNC connectors shown in Figure 2 For pinout diagrams and more specific information about connecting s...

Page 3: ... 3 GND P0 5 P0 7 GND SRC7 GND UP DN6 SRC6 GND UP DN5 SRC5 GND UP DN7 P0 0 P0 2 GND P0 4 P0 6 GND OUT7 GATE7 GND OUT6 GATE6 GND OUT5 GATE5 GND PFI 0 2 4 6 8 10 12 14 16 18 OUT4 GATE4 GND OUT3 GATE3 GND OUT2 GATE2 GND OUT1 GATE1 GND OUT0 GATE0 RESERVE1 UP DN4 SRC4 GND UP DN3 SRC3 GND UP DN2 SRC2 GND UP DN1 SRC1 GND UP DN0 SRC0 RESERVE2 PFI 20 22 24 26 28 30 32 34 36 38 PFI LINES 0 39 PWR PFI LINES 3...

Page 4: ...and GND Controls for the outputs listed above Quadrature Encoder Digital Trigger Frequency Selection and Frequency Adjust Table 1 lists the controls and the outputs associated with them Six bidirectional user defined spring terminals USER 1 6 Six user defined BNC connectors USER 1 6 Note The user defined spring terminals are internally mapped one to one to corresponding BNC connectors For example ...

Page 5: ... or a failure 3 If you need to ground a signal a ground GND spring terminal is available between every two PFI lines For details about grounding a signal refer to the 660X User Manual The user defined functions area of the BNC 2121 has six user defined spring terminals USER 1 6 and six corresponding BNC connectors USER 1 6 Use these spring terminals for either input or output For example if you wa...

Page 6: ...g the LED to light up When you release the button the trigger line goes low You can access the digital trigger by connecting a wire to the Trigger spring terminal The digital trigger also can simulate a channel Z pulse for quadrature encoder functions The lowpass filter on the BNC 2121 is designed to remove glitches on the trigger output If you want to use unconditional trigger output to test the ...

Page 7: ... Frequency Selection switch to select a frequency range of 10 Hz 200 Hz 150 Hz 20 kHz or 14 kHz 1 MHz 3 Adjust the frequency within the range you selected by turning the Frequency Adjust knob Viewing the State of the DIO Lines The eight Digital I O indicators indicate the state of PFI 0 7 on a 660X device When the LED is lit the channel is in the high state When the LED is off the channel is in th...

Page 8: ... retains its value until you press the Digital Trigger button again and counting continues Single Period Measurement To take a single period measurement complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to GATE of the selected counter The counter counts the rising edges on SOURCE b...

Page 9: ...ers Single Pulse Generation To generate a single pulse complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Specify the pulse delay and pulse width in the C interface or LabVIEW 3 To see the signal connect an oscilloscope or analog input device to OUT of the selected counter Single Triggered Pulse Generation To generate a s...

Page 10: ...T of the selected counter Continuous Pulse Train Generation To generate a continuous pulse train complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 In the C interface or in LabVIEW specify the frequency and duty cycle of the pulse train 3 To see the signal connect an oscilloscope or analog input device to OUT of the selec...

Page 11: ... To ensure valid measurement data discard the first value because the counter may be armed between active edges The counter is latched at each active GATE edge rising or falling and the counter resets to zero Buffered Semi Period Measurement To perform buffered semi period measurement complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selec...

Page 12: ...steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to UP DOWN of the selected counter 3 Connect a wire from the Trigger spring terminal to GATE of the selected counter The counter counts the rising edges on SOURCE between the active edge of UP DOWN and the active edge of GATE The counter value latches at ...

Page 13: ... frequency measured is the number of counts divided by the duration of GATE in seconds Another counter pair also can be similarly used Simultaneously Starting Counters You can configure two or more counters to arm from the same start trigger using a software or hardware command To simultaneously arm two or more counters to perform single pulse generation complete the following steps 1 Configure tw...

Page 14: ... 6 BNC connectors Spring terminals 6 positions wire no larger than 24 AWG Quadrature Encoder Spring terminals 2 Channel A Channel B output channels Channel A leads Channel B when the encoder knob is turned 90 clockwise Pulse width 1 µs Resolution 24 pulses per revolution Digital Trigger Number of signals 1 TRG signal for triggering Spring terminals 1 position Lowpass filter f0 15 Hz Function Gener...

Page 15: ...indicators 8 1 per digital line on PFI 0 7 Power Requirement 5 VDC 5 200 mA sourced from 660X device which provides 1 A Power available at 5 V spring terminal 5 600 mA sourced from 660X device which provides 1 A Physical Dimensions 27 2 by 11 2 by 5 21 cm 10 69 by 4 41 by 2 05 in I O connector 68 pin male SCSI II type BNC connectors 14 Spring terminal plugs 72 0 1 2 3 4 5 6 1 MHz 10 kHz 5 kHz 2 kH...

Page 16: ...ectromagnetic Compatibility CE C Tick and FCC Part 15 Class A Compliant Emissions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity EN 61326 1997 A2 2001 Table 1 Note For EMC compliance you must operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE Marking as follows Low Voltage Directive s...

Page 17: ...ocal office or National Instruments corporate For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Québec 514 694 8521 Ca...

Page 18: ...ompany names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 2001 2003 National Instruments Corp All rights reserved 322640C 01 Jun03 322640C 01 ...

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