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National Instruments DAQ SCB-68 User Manual
Summary of DAQ SCB-68
Page 1
Daq scb-68 68-pin shielded connector block user manual scb-68 shielded connector block user manual december 2002 edition part number 320745b-01.
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Support worldwide technical support and product information ni.Com national instruments corporate headquarters 11500 north mopac expressway austin, texas 78759-3504 usa tel: 512 683 0100 worldwide offices australia 03 9879 5166, austria 0662 45 79 90 0, belgium 02 757 00 20, brazil 55 11 3262 3599, ...
Page 3: Important Information
Important information warranty the scb-68 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National instruments will, at its option, repair or replace equipment that proves to be defective d...
Page 4: Compliance
Compliance ffcc/canada radio frequency interference compliance determining fcc class the federal communications commission (fcc) has rules to protect wireless communications from interference. The fcc places digital electronics into two classes. These classes are known as class a (for use in industr...
Page 5
Canadian department of communications this class b digital apparatus meets all requirements of the canadian interference-causing equipment regulations. Cet appareil numérique de la classe b respecte toutes les exigences du règlement sur le matériel brouilleur du canada. Compliance to eu directives r...
Page 6: Contents
© national instruments corporation vii scb-68 shielded connector block user manual contents about this manual conventions ...................................................................................................................Xi ni documentation...............................................
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Contents scb-68 shielded connector block user manual viii ni.Com single-ended connection considerations ...................................................... 3-8 single-ended connections for floating signal sources (rse input mode).......................................................................
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Contents © national instruments corporation ix scb-68 shielded connector block user manual selecting a resistor .........................................................................................5-17 adding components................................................................................
Page 9: About This Manual
© national instruments corporation xi scb-68 shielded connector block user manual about this manual this manual describes the scb-68 and explains how to use the connector block with national instruments data acquisition (daq) devices. Conventions the following conventions appear in this manual: angl...
Page 10: Ni Documentation
About this manual scb-68 shielded connector block user manual xii ni.Com ni documentation for more information about using the scb-68 with daq devices, refer to the following resources: • daq device user manuals, at ni.Com/manuals • ni developer zone, at ni.Com/zone.
Page 11: Introduction
© national instruments corporation 1-1 scb-68 shielded connector block user manual 1 introduction the scb-68 is a shielded i/o connector block with 68 screw terminals for easy signal connection to a national instruments 68- or 100-pin daq device. The scb-68 features a general breadboard area for cus...
Page 12: Quick Reference Label
Chapter 1 introduction scb-68 shielded connector block user manual 1-2 ni.Com ❑ the following items, if you are adding components (optional): – soldering iron and solder – resistors – capacitors quick reference label a quick reference label for e series devices is included in this kit. Quick referen...
Page 13
Chapter 1 introduction © national instruments corporation 1-3 scb-68 shielded connector block user manual ni 6024e for pcmcia (daqcard-6024e), ni 6036e for pcmcia (daqcard-6036e), ni 6062e for pcmcia (daqcard-6062e) sch68-68-ep, rc68-68 direct feedthrough only thermocouple measurements open thermoco...
Page 14
Chapter 1 introduction scb-68 shielded connector block user manual 1-4 ni.Com s series devices ni 6110/6111 for pci sh68-68-ep sh68-68r1-ep, r6868 direct feedthrough only ni 6115/6120 for pci/pxi/compactpci sh68-68-ep sh68-68r1-ep, r6868 direct feedthrough only timing i/o (tio) devices ni 6601/6602 ...
Page 15: Installing Cables
Chapter 1 introduction © national instruments corporation 1-5 scb-68 shielded connector block user manual figure 1-1. Scb-68 parts locator diagram installing cables the following sections describe how to cable one or more scb-68 connector blocks to a daq device using 68-pin or 100-pin cables. Note f...
Page 16
Chapter 1 introduction scb-68 shielded connector block user manual 1-6 ni.Com figure 1-2 shows how to use a 68-pin cable to connect the scb-68 to a 68-pin daq device. Figure 1-2. Connecting a 68-pin daq device to an scb-68 using 100-pin cables you can use the sh1006868 cable assembly to connect two ...
Page 17
Chapter 1 introduction © national instruments corporation 1-7 scb-68 shielded connector block user manual figure 1-3. Connecting a 100-pin daq device to two scb-68 connector blocks when you attach two scb-68 devices to the sh1006868 cable, one of the scb-68 connector blocks has a full 68-pin i/o con...
Page 18
Chapter 1 introduction scb-68 shielded connector block user manual 1-8 ni.Com figure 1-4. Scb-68 e series i/o connector pinout (full) freq_out gpctr0_out pfi9/gpctr0_gate dgnd pfi6/wftrig pfi5/update* dgnd +5v dgnd pfi1/trig2 pfi0/trig1 dgnd dgnd +5v dgnd dio6 dio1 dgnd dio4 extref 3 dac1out 1 dac0o...
Page 19
Chapter 1 introduction © national instruments corporation 1-9 scb-68 shielded connector block user manual figure 1-5 shows the pin assignments for the extended ai connector. This pinout shows the other 68-pin connector when you use the sh1006868 cable assembly with an ni 6031e, ni 6033e, or ni 6071e...
Page 20
Chapter 1 introduction scb-68 shielded connector block user manual 1-10 ni.Com figure 1-6 shows the pin assignments for the extended digital connector. This pinout shows the other 68-pin connector when you use the sh1006868 cable assembly with an ni 6025e or the ni 6021e (at-mio-16de-10) for isa. Fi...
Page 21: Configuring The Scb-68
Chapter 1 introduction © national instruments corporation 1-11 scb-68 shielded connector block user manual configuring the scb-68 for instructions about using measurement & automation explorer (max) to configure the scb-68 as an accessory for a daq device, complete the following steps: 1. Navigate t...
Page 22
Chapter 1 introduction scb-68 shielded connector block user manual 1-12 ni.Com • pollution degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation. Clean the scb-68 with a soft nonmetallic brush. Make sure that the scb-68 is...
Page 23
Chapter 1 introduction © national instruments corporation 1-13 scb-68 shielded connector block user manual installation, and equipment for industrial use, such as stationary motors with a permanent connection to the building/fixed installation. • installation category iv is for measurements performe...
Page 24
© national instruments corporation 2-1 scb-68 shielded connector block user manual 2 parts locator and wiring guide this chapter explains how to connect signals to the scb-68. The following cautions contain important safety information concerning hazardous voltages and terminal blocks. Cautions keep...
Page 25
Chapter 2 parts locator and wiring guide scb-68 shielded connector block user manual 2-2 ni.Com figure 2-1. Scb-68 printed circuit diagram 1 pads r20 and r21 2 switches s3, s4, and s5 3 68-pin i/o connector 4 fuse (0.8 a) 5 switches s1 and s2 6 assembly number and revision letter 7 screw terminals 8...
Page 26: Switch Configuration
Chapter 2 parts locator and wiring guide © national instruments corporation 2-3 scb-68 shielded connector block user manual to connect signals to the scb-68, complete the following steps while referring to figure 1-1, scb-68 parts locator diagram , and to figure 2-1. 1. Disconnect the 68-pin cable f...
Page 27
Chapter 2 parts locator and wiring guide scb-68 shielded connector block user manual 2-4 ni.Com table 2-1. Switch configurations and affected signals switch setting applicable signals direct feedthrough, with temperature sensor disabled and accessory power disabled analog input, analog output, digit...
Page 28
Chapter 2 parts locator and wiring guide © national instruments corporation 2-5 scb-68 shielded connector block user manual single-ended temperature sensor, with accessory power enabled 2 single-ended analog input 3 differential temperature sensor, with accessory power enabled 2 differential analog ...
Page 29: Connecting Signals
© national instruments corporation 3-1 scb-68 shielded connector block user manual 3 connecting signals this chapter describes the types of signal sources that you use when configuring the channels and making signal connections to the scb-68, describes input modes, and discusses noise considerations...
Page 30
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-2 ni.Com figure 3-1. Summary of ai connections + – + – + – v 1 ach aisense aignd + – + – v 1 ach aignd + – + – v 1 ach(+) ach(–) aignd + – + – v 1 ach(+) ach(–) aignd r refer to the using bias resistors section for informatio...
Page 31
Chapter 3 connecting signals © national instruments corporation 3-3 scb-68 shielded connector block user manual nonreferenced or floating signal sources a floating signal source is a signal source that is not connected in any way to the building ground system, but has an isolated ground-reference po...
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Chapter 3 connecting signals scb-68 shielded connector block user manual 3-4 ni.Com ground-referenced signal sources a grounded signal source is connected in some way to the building system ground; therefore, the signal source is already connected to a common ground point with respect to the daq dev...
Page 33
Chapter 3 connecting signals © national instruments corporation 3-5 scb-68 shielded connector block user manual analog input channel configuration diagram for ach and ach ). Any signal conditioning circuitry requiring a ground reference should be built in the custom breadboard area using aisense as ...
Page 34
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-6 ni.Com differential connections for ground-referenced signal sources figure 3-2 shows how to connect a ground-referenced signal source to a channel on the daq device configured in diff input mode. Figure 3-2. Differential i...
Page 35
Chapter 3 connecting signals © national instruments corporation 3-7 scb-68 shielded connector block user manual differential connections for nonreferenced or floating signal sources figure 3-3 shows how to connect a floating signal source to a channel on the daq device configured in diff input mode....
Page 36
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-8 ni.Com common-mode rejection might be improved by using another bias resistor between ach+ or ach i >, and aignd. This connection creates a slight measurement error caused by the voltage divider formed with the output imped...
Page 37
Chapter 3 connecting signals © national instruments corporation 3-9 scb-68 shielded connector block user manual single-ended connections for floating signal sources (rse input mode) figure 3-4 shows how to connect a floating signal source to a channel on the daq device configured for rse input mode....
Page 38
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-10 ni.Com figure 3-5 shows how to connect a grounded signal source to a channel on the daq device configured for nrse input mode. Figure 3-5. Single-ended input connections for ground-referenced signals connecting analog outp...
Page 39: Connecting Digital Signals
Chapter 3 connecting signals © national instruments corporation 3-11 scb-68 shielded connector block user manual figure 3-6 shows how to make ao connections and the external reference connection to the scb-68 and the daq device. Figure 3-6. Connecting ao signals connecting digital signals when using...
Page 40: Connecting Timing Signals
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-12 ni.Com figure 3-7. Digital i/o connections connecting timing signals if you are using a 68-pin or 100-pin daq device, all external control over device timing is routed through the programmable function input (pfi) lines . ...
Page 41: Noise Considerations
Chapter 3 connecting signals © national instruments corporation 3-13 scb-68 shielded connector block user manual all digital timing connections are referenced to dgnd. Figure 3-8 demonstrates how to connect two external timing signals to the pfi pins of a daq device. Figure 3-8. Timing i/o connectio...
Page 42
Chapter 3 connecting signals scb-68 shielded connector block user manual 3-14 ni.Com ach+ and ach– inputs are twisted together and then covered with a shield. You then connect this shield at only one point to the signal source ground. This kind of connection is required for signals traveling through...
Page 43: Using Thermocouples
© national instruments corporation 4-1 scb-68 shielded connector block user manual 4 using thermocouples this chapter describes how to take thermocouple measurements using the scb-68. A thermocouple is created when two dissimilar metals touch, and the contact produces a small voltage that changes as...
Page 44
Chapter 4 using thermocouples scb-68 shielded connector block user manual 4-2 ni.Com the maximum voltage level thermocouples generate is typically only a few millivolts. Therefore, you should use a daq device with high gain for best resolution. You can measure thermocouples in either differential or...
Page 45: Special Considerations
Chapter 4 using thermocouples © national instruments corporation 4-3 scb-68 shielded connector block user manual figure 4-1. Single-ended switch configuration for differential operation, connect differential analog channel 0 to the temperature sensor by switching s5 and s4 to the up position, as sho...
Page 46: Adding Components
© national instruments corporation 5-1 scb-68 shielded connector block user manual 5 adding components for special functions this chapter describes how to condition signals by adding components to the open component locations of the scb-68. To add components to these locations, the daq device must s...
Page 47: Channel Pad Configurations
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-2 ni.Com you can create virtual channels in max to map your voltage ranges to the type of transducer that you are using or to create a custom scale. Channel pad configurations when you use the scb-68 with...
Page 48
Chapter 5 adding components for special functions © national instruments corporation 5-3 scb-68 shielded connector block user manual conditioning analog output channels figure 5-2 illustrates the generic ao channel pad configuration, and table 5-2 describes the ao component locations and labels. Fig...
Page 49
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-4 ni.Com figure 5-3. Analog output channel configuration diagram for dac0out conditioning pfi0/trig1 figure 5-4 illustrates the digital input channel configuration, and figure 5-5 shows the digital input ...
Page 50: Open Thermocouple Detection
Chapter 5 adding components for special functions © national instruments corporation 5-5 scb-68 shielded connector block user manual accuracy and resolution considerations when you measure voltage to subsequently measure current, take the following steps to maximize measurement accuracy: 1. Refer to...
Page 51
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-6 ni.Com differential open thermocouple detection use position a to connect a high-value resistor between the positive input and +5v. Leave the jumpers in place (positions f and g) for each channel used. ...
Page 52: Lowpass Filtering
Chapter 5 adding components for special functions © national instruments corporation 5-7 scb-68 shielded connector block user manual thermocouple wire error is the result of inconsistencies in the thermocouple manufacturing process. These inconsistencies, or nonhomogeneities, are the result of defec...
Page 53
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-8 ni.Com figure 5-6. Transfer function attenuation for an ideal filter figure 5-7. Transfer function attenuation for a real filter the cut-off frequency, f c , is defined as the frequency beyond which the...
Page 54
Chapter 5 adding components for special functions © national instruments corporation 5-9 scb-68 shielded connector block user manual ringing in the signal as the higher frequency components of the signal are delayed. Figure 5-8. Square wave input signal figures 5-9 and 5-10 show the difference in re...
Page 55
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-10 ni.Com figure 5-10. Response of a real filter to a square wave input signal one-pole lowpass rc filter figure 5-11 shows the transfer function of a simple series circuit consisting of a resistor ( r ) ...
Page 56
Chapter 5 adding components for special functions © national instruments corporation 5-11 scb-68 shielded connector block user manual use equation 5-3 to design a lowpass filter for a simple resistor and capacitor circuit, where the values of the resistor and capacitor alone determine f c . In this ...
Page 57
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-12 ni.Com for any type of lowpass filter, use equation 5-5 to determine the cut-off frequency ( f c ). (5-5) single-ended lowpass filter to build a single-ended lowpass filter, refer to figure 5-12. Add t...
Page 58
Chapter 5 adding components for special functions © national instruments corporation 5-13 scb-68 shielded connector block user manual lowpass filtering applications noise filtering and antialiasing are two applications that use lowpass filters. Noise filtering you can use a lowpass filter to highly ...
Page 59
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-14 ni.Com to prevent aliasing, remove all signal components with frequencies greater than the nyquist frequency from input signals before those signals are sampled. Once a data sample is aliased, it is im...
Page 60
Chapter 5 adding components for special functions © national instruments corporation 5-15 scb-68 shielded connector block user manual figure 5-15. Lowpass filtering of ao signals special consideration for digital trigger input signals lowpass filters can function as debouncing filters to smooth nois...
Page 61
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-16 ni.Com apply a lowpass filter to the signal to remove the high-frequency component for a cleaner digital signal, as figure 5-17 shows. Figure 5-17. Lowpass filtering of digital trigger input signals no...
Page 62
Chapter 5 adding components for special functions © national instruments corporation 5-17 scb-68 shielded connector block user manual figure 5-18. Current-to-voltage electrical circuit the application software must linearly convert voltage back to current. Equation 5-8 demonstrates this conversion, ...
Page 63: Attenuating Voltage
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-18 ni.Com adding components caution do not exceed ±10 v at the analog inputs. Ni is not liable for any device damage or personal injury resulting from improper connections. You can build a one-resistor ci...
Page 64
Chapter 5 adding components for special functions © national instruments corporation 5-19 scb-68 shielded connector block user manual figure 5-19. Attenuating voltage with a voltage divider theory of operation the voltage divider splits the input voltage ( v in ) between two resistors ( r 1 and r 2 ...
Page 65
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-20 ni.Com selecting components to set up the resistors, complete the following steps: 1. Select the value for r 2 (10 k Ω is recommended). 2. Use equation 5-12 to calculate the value for r 1 . Base the r ...
Page 66
Chapter 5 adding components for special functions © national instruments corporation 5-21 scb-68 shielded connector block user manual figure 5-20. Scb-68 circuit diagram for se input attenuation install resistors in positions b and f, or positions d and g, depending on the channel you are using on t...
Page 67
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-22 ni.Com analog output and digital input attenuators to build a two-resistor circuit for attenuating voltages at the dac0out, dac1out, and trig1 pins on the scb-68, refer to the pad positions in figure 5...
Page 68
Chapter 5 adding components for special functions © national instruments corporation 5-23 scb-68 shielded connector block user manual figure 5-23. Input impedance electrical circuit z in is the new input impedance. Refer to appendix a, specifications , in the device user manuals at ni.Com/manuals fo...
Page 69
Chapter 5 adding components for special functions scb-68 shielded connector block user manual 5-24 ni.Com special considerations for digital inputs if you use the v in voltage of figure 5-20 to feed ttl signals, you must calculate v in so that the voltage drop on r 2 does not exceed 5 v. Caution a v...
Page 70: Specifications
© national instruments corporation a-1 scb-68 shielded connector block user manual a specifications this appendix lists the scb-68 specifications. These ratings are typical at 25 °c unless otherwise stated. Analog input number of channels 68-pin daq devices ....................... Eight differential...
Page 71
Chapter a specifications scb-68 shielded connector block user manual a-2 ni.Com voltage rating .........................................250 v nominal resistance .................................0.195 Ω physical box dimensions (including box feet)......19.5 by 15.2 by 4.5 cm (7.7 by 6.0 by 1.8 in.) i...
Page 72
Chapter a specifications © national instruments corporation a-3 scb-68 shielded connector block user manual safety the scb-68 meets the requirements of the following standards for safety and electrical equipment for measurement, control, and laboratory use: • iec 61010-1, en 61010-1 • ul 3111-1 • ca...
Page 73: Quick Reference Labels
© national instruments corporation b-1 scb-68 shielded connector block user manual b quick reference labels this appendix shows the pinouts that appear on the quick reference labels for the daq devices that are compatible with the scb-68..
Page 74
Chapter b quick reference labels scb-68 shielded connector block user manual b-2 ni.Com figure b-1. E series devices dac1 out dac0 out scanclk extref aognd aognd aignd dio5 51 ach4 s4 * 68 generic terminals accessory power off) (temp. Sensor and s4 * accessory power on on differential ch. 0 * temp. ...
Page 75
Chapter b quick reference labels © national instruments corporation b-3 scb-68 shielded connector block user manual figure b-2. Ni 670 x devices s4 * 68 generic terminals accessory power off) (temp. Sensor and s5 23 57 s3 s2 s1 58 24 25 59 27 60 26 61 28 vch1 66 ich17* 62 29 30 63 64 31 32 65 agnd0/...
Page 76
Chapter b quick reference labels scb-68 shielded connector block user manual b-4 ni.Com figure b-3. Ni 671 x /673 x devices dac1 out dac0 out ncc extref aognd aognd aignd dio5 51 s4 * 68 generic terminals accessory power off) (temp. Sensor and s5 23 57 22 56 s3 s2 s1 58 24 25 59 27 60 26 61 28 21 55...
Page 77
Chapter b quick reference labels © national instruments corporation b-5 scb-68 shielded connector block user manual figure b-4. S series devices dac1out dac0out nc scanclk aognd aognd dio5 51 s4 * 68 generic terminals accessory power off) (temp. Sensor and s4 * accessory power on on differential ch....
Page 78
Chapter b quick reference labels scb-68 shielded connector block user manual b-6 ni.Com figure b-5. Ni 660 x devices s1 s2 s3 s4 set switches as follows for ni 660 x devices. If using an ni 660 x device with an optional scb-68 shielded connector block accessory, affix this label to the inside of the...
Page 79
Chapter b quick reference labels © national instruments corporation b-7 scb-68 shielded connector block user manual figure b-6. Ni 653 x devices s1 s2 s3 s4 *set switches as follows for the ni 653 x if using an ni 653 x with an optional scb-68 shielded connector block accessory, affix this label to ...
Page 80
Chapter b quick reference labels scb-68 shielded connector block user manual b-8 ni.Com figure b-7. Ni 7811r/7831r devices s1 nc = no connect 1 the mio column corresponds to the mio connector on the ni 7831r, and the dio column corresponds to the dio connectors on the ni 7811r / 7831r. S2 s3 s4 set ...
Page 81: Fuse and Power
© national instruments corporation c-1 scb-68 shielded connector block user manual c fuse and power one of the +5 v lines from the daq device (pin 8) is protected by an 800 ma fuse. Pin 14 is also +5 v, but it is not fuse-protected on the scb-68. Shorting pin 14 to ground blows the fuse, which is us...
Page 82: Scb-68 Circuit Diagrams
© national instruments corporation d-1 scb-68 shielded connector block user manual d scb-68 circuit diagrams this appendix contains illustrations of circuit diagrams for the scb-68. Figure d-1. +5 v power supply +5v (i/o pin 8) +5v screw terminal acc not powered (nc) c2 (10 µ f) xf1 (clip) 800 ma 5x...
Page 83
Chapter d scb-68 circuit diagrams scb-68 shielded connector block user manual d-2 ni.Com figure d-2. Cold-junction compensation circuitry figure d-3. Digital trigger circuitry ach0 (i/o pin 68) s5 cjc not used cjc used r38 q1 +5v c3 (0.1 µ f) c5 (1 µ f) r23 +5v r5 ach8 screw terminal s4 ach8 (i/o pi...
Page 84
Chapter d scb-68 circuit diagrams © national instruments corporation d-3 scb-68 shielded connector block user manual figure d-4. Analog output circuitry rc3 dac0out (i/o pin 22) r3 aognd (i/o pin 55) rc2 dac1out (i/o pin 21) r2 dac1out screw terminal aognd (i/o pin 54) aognd screw terminal aognd scr...
Page 85: Soldering and Desoldering
© national instruments corporation e-1 scb-68 shielded connector block user manual e soldering and desoldering on the scb-68 some applications discussed here require you to make modifications to the scb-68, usually in the form of adding components to the printed circuit device. To solder and desolde...
Page 86
Chapter e soldering and desoldering on the scb-68 scb-68 shielded connector block user manual e-2 ni.Com 1. Disconnect the 68-pin cable from the scb-68 if it is connected. 2. Remove the shielding screws on either side of the top cover with a phillips-head number 1 screwdriver. You can now open the b...
Page 87: Technical Support and
© national instruments corporation f-1 scb-68 shielded connector block user manual f technical support and professional services visit the following sections of the national instruments web site at ni.Com for technical support and professional services: • support —online technical support resources ...
Page 88
Chapter f technical support and professional services scb-68 shielded connector block user manual f-2 ni.Com • calibration certificate —if your product supports calibration, you can obtain the calibration certificate for your product at ni.Com/calibration . If you searched ni.Com and could not find ...
Page 89: Glossary
© national instruments corporation g-1 scb-68 shielded connector block user manual glossary prefix meanings value p- pico 10 –12 n- nano- 10 –9 µ - micro- 10 – 6 m- milli- 10 –3 k- kilo- 10 3 m- mega- 10 6 g- giga- 10 9 numbers/symbols ° degrees > greater than ≤ less than or equal to ≥ greater than ...
Page 90
Glossary scb-68 shielded connector block user manual g-2 ni.Com square root of +5v +5 vdc source signal a a amperes a/d analog-to-digital ac alternating current ach analog input channel signal adc analog-to-digital converter—an electronic device, often an integrated circuit, that converts an analog ...
Page 91
Glossary © national instruments corporation g-3 scb-68 shielded connector block user manual cm centimeter cold-junction compensation cjc—an artificial reference level that compensates for ambient temperature variations in thermocouple measurement circuits compactpci refers to the core specification ...
Page 92
Glossary scb-68 shielded connector block user manual g-4 ni.Com e extref external reference signal extstrobe external strobe signal exttrig external trigger signal f freq_out frequency output signal ft feet g gain the factor by which a signal is amplified, often expressed in db gate gate signal gpct...
Page 93
Glossary © national instruments corporation g-5 scb-68 shielded connector block user manual i i/o input/output—the transfer of data to/from a computer system involving communications channels, operator interface devices, and/or data acquisition and control interfaces i oh current, output high i ol c...
Page 94
Glossary scb-68 shielded connector block user manual g-6 ni.Com nyquist frequency a frequency that is half of the sampling frequency o out output pin—a counter output pin where the counter can generate various ttl pulse waveforms p pci peripheral component interconnect—a high-performance expansion b...
Page 95
Glossary © national instruments corporation g-7 scb-68 shielded connector block user manual pxi pci extensions for instrumentation—an open specification that builds off the compactpci specification by adding instrumentation-specific features r range the maximum and minimum parameters between which a...
Page 96
Glossary scb-68 shielded connector block user manual g-8 ni.Com t thermocouple a temperature sensor created by joining two dissimilar metals; the junction produces a small voltage as a function of the temperature trig trigger signal ttl transistor-transistor logic u unipolar a signal range that is a...
Page 97: Index
© national instruments corporation i-1 scb-68 shielded connector block user manual index numbers +5 v signal fuse and power considerations, c-1 power supply (figure), d-1 68-pin cables connecting to scb-68 (figure), 1-6 installing, 1-5 to 1-6 quick reference label (table), 1-2 100-pin cables connect...
Page 98
Index scb-68 shielded connector block user manual i-2 ni.Com dac0out configuration diagram (figure), 5-4 input attenuators, 5-22, 5-23 lowpass filter considerations, 5-12, 5-14 to 5-15 analog output signal connections description, 3-10 to 3-11 switch settings (table), 4-4 antialiasing filtering, 5-1...
Page 99
Index © national instruments corporation i-3 scb-68 shielded connector block user manual selecting components, 5-20 accuracy considerations, 5-20 special considerations analog input, 5-22 to 5-23 analog output, 5-23 digital inputs, 5-24 theory of operation, 5-19 channel pad configurations, 5-2 to 5-...
Page 100
Index scb-68 shielded connector block user manual i-4 ni.Com selecting resistor, 5-17 theory of operation, 5-16 to 5-17 d dac0out signal component location in diff input mode (table), 5-3 configuration diagram (figure), 5-4 dac1out signal component location (table), 5-3 declaration of conformity (do...
Page 101
Index © national instruments corporation i-5 scb-68 shielded connector block user manual i input modes. See analog input signal connections installation 68-pin cables, 1-5 to 1-6 connecting to scb-68 (figure), 1-6 quick reference label (table), 1-2 100-pin cables, 1-6 to 1-10 connecting to scb-68 (f...
Page 102
Index scb-68 shielded connector block user manual i-6 ni.Com nonreferenced or floating signal sources bias resistors, 3-7 description, 3-3 description (figure), 3-2 differential connections, 3-3, 3-7 to 3-8 recommended configuration (figure), 3-2 single-ended connections (rse input mode), 3-3, 3-9 n...
Page 103
Index © national instruments corporation i-7 scb-68 shielded connector block user manual safety information, 1-11 to 1-13 specifications, a-1 to a-3 scb-68 e series i/o connector pinout extended ai (figure), 1-9 extended digital (figure), 1-10 full (figure), 1-8 signal connections. See connecting si...
Page 104
Index scb-68 shielded connector block user manual i-8 ni.Com special considerations analog input, 5-22 to 5-23 analog output, 5-23 digital inputs, 5-24 theory of operation, 5-19.