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Measurement Computing USB-2533, Руководство пользователя

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USB-2533 User's Guide 

Functional Details 

29  

Thermocouple input 

You can configure up to four analog inputs on the USB-2533 to accept a TC input. Built-in cold-junction 
sensors are provided for each of the screw-terminal connectors, and any TC type can be attached to any of the 
four thermocouple channels. 

When measuring TCs, the USB-2533 can operate in an averaging mode, taking multiple readings on each 
channel, applying digital filtering and cold-junction compensation, and then converting the readings to 
temperature. 

As a result, the USB-2533 measures channels with TCs attached at a rate from 50 Hz to 10 kHz, depending on 
how much over-sampling is selected.  

Additionally, a rejection frequency can be specified in which over sampling occurs during one cycle of either 
50 Hz or 60 Hz, providing a high level of 50 Hz or 60 Hz rejection. 

Tips for making accurate temperature measurements 

ƒ

 

Use as much oversampling as possible. 

ƒ

 

Warm up the USB-2533 for 60 minutes—including TC wires—so that it is thermally stabilized. This 
warm-up time enables the CJC thermistors to more accurately measure the junction at the terminal block. 

ƒ

 

Make sure the surrounding environment is thermally stabilized and ideally around 20 °C to 30 °C. If the 
board’s ambient temperature is changing due to a local heating or cooling source, then the TC junction 
temperature may be changing and the CJC thermistor will have a larger error. 

ƒ

 

Use small-diameter, 

instrument-grade

 TC wire. Small diameter TC wire has less effect on the TC junction 

at the terminal block because less heat is transferred from the ambient environment to the junction. 

ƒ

 

Use shielded TC wire (see "

Shielding

" below) with the shield connected to analog common to reduce noise. 

The USB-2533 has several analog common pins on both the 68-pin connector and the 40-pin connectors, 
and the TB-7 has one analog common screw terminal. 
You can also minimize the effect of noise by averaging readings (see "

Averaging

" below), or combining 

both shielding and averaging. 

Refer to "

68-pin SCSI connector differential and single-ended pin outs (P5)

" on page 13, "

40-pin header 

connector pin outs

" on page 16, and "

Four-channel TC terminal pin out (TB7)"

 on page 19 for the locations 

of these analog common pins. 

ƒ

 

Make sure the USB-2533 is mounted on a flat surface. 

ƒ

 

Be careful to avoid loading down the digital outputs too heavily (>1 mA). Heavy load down causes 
significant heat generation inside the unit and increase the CJC thermistor error.  

Shielding 

Use shielded TC wire with the shield connected to analog common to further reduce noise. 

The USB-2533 has one analog common screw-terminal on TB7 and several analog common pins on the headers 
(see "

Connecting the board for I/O operations

" starting on page 12). You can connect the shield of a shielded 

thermocouple to one of the analog commons. When this connection is made, leave the shield at the other end of 
the thermocouple unconnected. 

Caution!

 

Connecting the shield to common at both ends results in a ground loop. 

Averaging 

Certain acquisition programs apply 

averaging 

after several samples have been collected. Depending on the 

nature of the noise, averaging can reduce noise by the square root of the number of averaged samples. 

Although averaging can be effective, it suffers from several drawbacks.  

Содержание USB-2533

Страница 1: ......

Страница 2: ...USB 2533 User s Guide Document Revision 2 March 2007 Copyright 2007 Measurement Computing Corporation ...

Страница 3: ...ven due to misuse for only 50 of the current list price I O boards face some tough operating conditions some more severe than the boards are designed to withstand When a board becomes damaged just return the unit with an order for its replacement at only 50 of the current list price We don t need to profit from your misfortune By the way we honor this warranty for any manufacturer s board that we ...

Страница 4: ... from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporatio...

Страница 5: ...the board for I O operations 12 Connectors cables main I O connector 12 68 pin SCSI connector differential and single ended pin outs P5 13 TB 100 terminal board connector to SCSI connector pin out 15 40 pin header connector pin outs 16 Four channel TC terminal pin out TB7 19 Cabling 20 Field wiring and signal termination 21 Chapter 3 Programming and Developing Applications 22 Programming languages...

Страница 6: ...Using multiple USB 2533s per PC 37 Chapter 5 Calibrating the USB 2533 38 Chapter 6 Specifications 39 Analog input 39 Accuracy 39 Thermocouples 40 Digital input output 40 Counters 41 Input sequencer 41 Trigger sources and modes 42 Frequency pulse generators 42 Power consumption 42 External power 43 USB specifications 43 Environmental 43 Mechanical 43 Signal I O connectors and pin out 43 68 pin SCSI...

Страница 7: ...talic text is used for the names of manuals and help topic titles and to emphasize a word or phrase For example The InstaCal installation procedure is explained in the Quick Start Guide Never touch the exposed pins or circuit connections on the board Where to find more information The following electronic documents provide information that can help you get the most out of your USB 2533 MCC s Speci...

Страница 8: ... can configure up to four of the analog inputs as differential thermocouple TC inputs The board has 24 high speed lines of digital I O two timer outputs and four 32 bit counters It provides up to 12 MHz scanning on all digital input lines You can operate all analog I O digital I O and counter timer I O synchronously Software features For information on the features of InstaCal and the other softwa...

Страница 9: ...re USB 2533 with seven standoffs USB cable 2 meter length Optional components Cables and signal conditioning accessories that are compatible with the USB 2533 are not included with USB 2533 orders and must be ordered separately If you ordered any of the following products with your board they should be included with your shipment PS 9V1AEPS 2500 power supply ...

Страница 10: ...ther grounded object to eliminate any stored static charge If any components are missing or damaged notify Measurement Computing Corporation immediately by phone fax or e mail Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com Installing the software Refer to the Quick Start Guide for instructions ...

Страница 11: ...me of the configuration options using InstaCal such as the analog input configuration 16 single ended or 8 differential channels and the edge used for pacing when using an external clock Once selected any program that uses the Universal Library initializes the hardware according to these selections You need a PS 9V1AEPS 2500 power supply sold separately when there is insufficient power from the US...

Страница 12: ...iconductor devices are especially susceptible to ESD damage Connecting the board for I O operations Connectors cables main I O connector The following table lists the board connectors applicable cables and compatible accessory products for the USB 2533 Board connectors cables and compatible hardware Parameter Specification Main connector 68 pin standard SCSI type III female connector Connector typ...

Страница 13: ...onnector pins J5 J8 and the TB7 TC connections Failure to do so could possibly cause equipment damage and or personal injury 68 pin SCSI connector pin out labeled P5 on the board 16 channel single ended mode Signal name Pin Pin Signal name ACH0 68 34 ACH8 AGND 67 33 ACH1 ACH9 66 32 AGND ACH2 65 31 ACH10 AGND 64 30 ACH3 ACH11 63 29 AGND SGND 62 28 ACH4 ACH12 61 27 AGND ACH5 60 26 ACH13 AGND 59 25 A...

Страница 14: ...GND 64 30 ACH3 HI ACH3 LO 63 29 AGND SGND 62 28 ACH4 HI ACH4 LO 61 27 AGND ACH5 HI 60 26 ACH5 LO AGND 59 25 ACH6 HI ACH6 LO 58 24 AGND ACH7 HI 57 23 ACH7 LO NC 56 22 NC NC 55 21 NC NEGREF 54 20 POSREF GND 53 19 5 V A1 52 18 A0 A3 51 17 A2 A5 50 16 A4 A7 49 15 A6 B1 48 14 B0 B3 47 13 B2 B5 46 12 B4 B7 45 11 B6 C1 44 10 C0 C3 43 9 C2 C5 42 8 C4 C7 41 7 C6 GND 40 6 TTL TRG CNT1 39 5 CNT0 CNT3 38 4 CN...

Страница 15: ...1 A6 15 AGND A7 49 ACH3 ACH3 HI 30 B0 14 ACH11 ACH3 LO 63 B1 48 AGND B2 13 ACH4 ACH4 HI 28 B3 47 ACH12 ACH4 LO 61 B4 12 AGND B5 46 ACH5 ACH5 HI 60 B6 11 ACH13 ACH5 LO 26 B7 45 AGND C0 10 ACH6 ACH6 HI 25 C1 44 ACH14 ACH6 LO 58 C2 9 AGND C3 43 ACH7 ACH7 HI 57 C4 8 ACH15 ACH7 LO 23 C5 42 NC 56 C6 7 SGND 62 C7 41 POSREF 20 TTLTRG 6 NC 55 GND NEGREF 54 CNT0 5 AGND CNT1 39 NC 22 CNT2 4 AGND CNT3 38 NC 2...

Страница 16: ...4 ACH18 ACH35 3 4 ACH51 AGND 5 6 AGND AGND 5 6 ACH58 ACH3 7 8 ACH11 ACH42 7 8 ACH50 ACH2 9 10 ACH10 ACH34 9 10 ACH57 ACH17 11 12 ACH25 AGND 11 12 ACH49 ACH16 13 14 ACH24 ACH41 13 14 ACH56 ACH1 15 16 ACH9 ACH33 15 16 ACH48 ACH0 17 18 ACH8 ACH40 17 18 AGND AGND 19 20 AGND ACH32 19 20 ACH63 ACH23 21 22 ACH31 ACH47 21 22 ACH55 ACH22 23 24 ACH30 ACH39 23 24 AGND ACH7 25 26 ACH15 ACH46 25 26 ACH62 ACH6 ...

Страница 17: ...H9 LO AGND 11 12 ACH25 HI ACH8 HI 13 14 ACH8 LO ACH17 LO 13 14 ACH24 LO ACH1 HI 15 16 ACH1 LO ACH17 HI 15 16 ACH24 HI ACH0 HI 17 18 ACH0 LO ACH16 LO 17 18 AGND AGND 19 20 AGND ACH16 HI 19 20 ACH31 LO ACH15 HI 21 22 ACH15 LO ACH23 LO 21 22 ACH31 HI ACH14 HI 23 24 ACH14 LO ACH23 HI 23 24 AGND ACH7 HI 25 26 ACH7 LO ACH22 LO 25 26 ACH30 LO ACH6 HI 27 28 ACH6 LO ACH22 HI 27 28 ACH30 HI AGND 29 30 ACH13...

Страница 18: ... GND 11 12 TTL TRG AGND 11 12 AGND B0 13 14 B4 SelfCal 13 14 SGND B1 15 16 B5 AGND 15 16 AGND B2 17 18 B6 TTL TRG 17 18 XDPCR B3 19 20 B7 XAPCR 19 20 GND digital GND 21 22 5 V GND digital 21 22 GND digital C0 23 24 C4 NC 23 24 NC C1 25 26 C5 5 V 25 26 AUX PWR C2 27 28 C6 NC 27 28 NC C3 29 30 C7 NC 29 30 NC GND 31 32 TMR1 NC 31 32 NC TMR0 33 34 CNT1 NC 33 34 NC CNT0 35 36 CNT3 NC 35 36 NC CNT2 37 3...

Страница 19: ...rminal pin out TB7 The TB7 terminal block can be used to connect up to four TCs The first TC channel makes use of ACH0 analog channel 0 for its positive lead and ACH8 for its negative lead The second TC channel uses ACH1 and ACH9 and so on as indicated in Figure 2 Figure 2 TC terminal pin out labeled TB7 40 pin female connectors C40FF x header cables USB cable AGND ACH0 ACH8 ACH1 ACH9 ACH2 ACH10 A...

Страница 20: ...SB 2533 s 68 pin SCSI connector The stripe identifies pin 1 68 34 35 1 68 35 34 1 Figure 3 CA 68 3R cable 68 34 1 35 34 1 68 35 Figure 4 CA 68 3S and CA 68 6S cable Use one or more C40FF x ribbon cable s Figure 5 to connect signals to one or more of the USB 2533 s 40 pin header connectors The red stripe identifies pin 1 40 pin Female IDC Connector 1 2 39 40 40 pin Female IDC Connector 1 2 39 40 Fi...

Страница 21: ...his product are available on our web site at www mccdaq com cbicatalog cbiproduct asp dept_id 98 pf_id 1787 A 19 inch rack mount kit RM TB 100 for the TB 100 termination board is also available Details on this product are available on our web site at www mccdaq com cbicatalog cbiproduct asp dept_id 98 pf_id 1786 You can use the following screw terminal board with the C40FF x cable CIO MINI40 40 pi...

Страница 22: ...nguage please refer to the Universal Library User s Guide available on our web site at www mccdaq com PDFmanuals sm ul user guide pdf Packaged applications programs Many packaged application programs now have drivers for your board If the package you own does not have drivers for the board please fax or e mail the package name and the revision number from the install disks We will research the pac...

Страница 23: ...gnals generated by the board diagrams of signals using default or conventional board settings USB 2533 components These USB 2533 components are shown in Figure 6 One USB port One external power connector One 68 pin SCSI connector Four 40 pin headers J5 J6 J7 and J8 One four channel TC screw terminal block Two LED indicators USB and power Figure 6 USB 2533 components J5 J6 J8 J7 TB7 P5 USB LED USB ...

Страница 24: ...r each header by connecting a C40FF x cable 40 pin header to female 40 pin header to each header 9 slot screw terminal TB7 You can use the on board screw terminal connector TB7 to connect up to four TC inputs TB7 uses the following analog channels to obtain its four differential channels TC CH0 CH 0 CH 8 TC CH1 CH 1 CH 9 TC CH2 CH 2 CH 10 TC CH3 CH 3 CH 11 When using the thermocouple channels do n...

Страница 25: ...Details 25 USB 2533 block diagram Figure 7 is a simplified block diagram of the USB 2533 This board provides all of the functional elements shown in the figure 16 bit 1 MHz A D converter A A A Figure 7 USB 2533 functional block diagram ...

Страница 26: ...er with any combination of analog input channels All analog input channels in the scan buffer are measured sequentially at 1 µs per channel For example in the fastest mode with a 0 delay between the end of scan and the start of scan a single analog channel can be scanned continuously at 1 MS s two analog channels can be scanned at 500 kS s each 16 analog input channels can be scanned at 62 5 kS s ...

Страница 27: ...ement channels making the minimum scan period for this example 7 X 256 µs or 1792 µs The maximum scan frequency is the inverse of this number 558 Hz For accurate measurements you must associate TC and CJC channels properly The TC channels must immediately follow their associated CJC channels in the channel array For accurate TC readings associate CJC0 with TC0 CJC1 with TC1 and TC2 and CJC2 with T...

Страница 28: ...tream to the PC via the USB cable Each analog channel requires one microsecond of scan time therefore the scan period can be no shorter than 6 µs for this example All of the digital channels are sampled at the start of scan and do not require additional scanning bandwidth as long as there is at least one analog channel in the scan group The 16 bits of digital input are sampled for every analog sam...

Страница 29: ...ock because less heat is transferred from the ambient environment to the junction Use shielded TC wire see Shielding below with the shield connected to analog common to reduce noise The USB 2533 has several analog common pins on both the 68 pin connector and the 40 pin connectors and the TB 7 has one analog common screw terminal You can also minimize the effect of noise by averaging readings see A...

Страница 30: ...ned the digital inputs can be scanned at up to 12 MHz Triggering Triggering can be the most critical aspect of a data acquisition application The USB 2533 supports the following trigger modes to accommodate certain measurement situations Hardware analog triggering The USB 2533 uses true analog triggering in which the trigger level you program sets an analog DAC which is then compared in hardware t...

Страница 31: ...trigger level the rising or falling edge and hysteresis Pattern triggering You can select any scanned digital input channel pattern to trigger an acquisition including the ability to mask or ignore specific bits Counter triggering You can program triggering to occur when one of the counters meets or exceeds a set value or is within a range of values You can program any of the included counter chan...

Страница 32: ...nt and is terminated when you issue a command to halt the acquisition Fixed pre trigger with infinite post trigger You set the amount of pre trigger data to acquire Then the system continues to acquire data until the program issues a command to halt acquisition Counter inputs Four 32 bit counters are built into the USB 2533 Each counter accepts frequency inputs up to 20 MHz The counters can concur...

Страница 33: ...t the 12 MHz rate When used as a 32 bit counter counter high two sample times are used to return the full 32 bit result Therefore a 32 bit counter can only be sampled at a 6 MHz maximum rate If you only want the upper 16 bits of a 32 bit counter then you can acquire that upper word at the 12 MHz rate The counter counts up and does not clear on every new sample However it does clear at the start of...

Страница 34: ...relays proximity switches and encoders There are two debounce modes as well as a debounce bypass as shown in Figure 13 In addition the signal from the buffer can be inverted before it enters the debounce circuitry The inverter is used to make the input rising edge or falling edge sensitive Edge selection is available with or without debounce In this case the debounce time setting is ignored and th...

Страница 35: ... output of the debounce module immediately changes state but will not change state again until a period of stability has passed For this reason the mode can be used to detect glitches Figure 15 Debounce module Trigger before stable mode The following time periods T1 through T6 pertain to the above drawing T1 In the illustrated example the input signal is low for the debounce time equal to T1 there...

Страница 36: ...th the counter output This can be done by connecting the source to an analog input Use trigger before stable mode when the input signal has groups of glitches and each group is to be counted as one The trigger before stable mode recognizes and counts the first glitch within a group but rejects the subsequent glitches within the group if the debounce time is set accordingly The debounce time should...

Страница 37: ...ut frequency 1 1 MHz 100 10 kHz 1000 1 kHz 10000 100 Hz 65535 15 259 Hz The two timer outputs can generate different square waves The timer outputs can be updated asynchronously at any time Using multiple USB 2533s per PC USB 2533 features can be replicated up to four times as up to four devices can be connected a single host PC The serial number on each USB 2533 distinguishes one from another You...

Страница 38: ...ion and the other which is available for field calibration You can perform field calibration automatically in seconds with InstaCal and without the use of external hardware or instruments Field calibration derives its traceability through an on board reference which has a stability of 0 005 per year Note that a two year calibration period is recommended for USB 2533 boards You should calibrate the...

Страница 39: ...tion 72 dB typical for 10 V range 1 kHz fundamental Total harmonic distortion 80 dB typical for 10 V range 1 kHz fundamental Calibration Auto calibration calibration factors for each range stored onboard in non volatile RAM CMRR 60 Hz 70 dB typical DC to 1 kHz Bias current 40 pA typical 0 C to 35 C Crosstalk 75 dB typical DC to 60Hz 65 dB typical 10kHz Input impedance 10 MΩ single ended 20 MΩ diff...

Страница 40: ...nput scanning Synchronous with input scanning Input Characteristics 220 Ω series resistors 20 pF to common Logic Keeper Circuit Holds the logic value to 0 or 1 when there is no external driver Input protection 15 kV ESD clamp diodes parallel Input high 2 0 V to 5 0 V Input low 0 to 0 8 V Output high 2 0 V Output low 0 8 V Output current Output 1 0 mA per pin sourcing more current may require a PS ...

Страница 41: ...unter inputs can be scanned based on either an internal programmable timer or an external clock source Table 6 Input sequencer specifications Scan clock sources two see Note 4 Internal Analog channels from 1 µs to 1 sec in 20 83 ns steps Digital channels and counters from 83 33 ns to 1 sec in 20 83 ns steps External TTL level input Analog channels down to 1 µs minimum Digital channels and counters...

Страница 42: ...r input Input signal range 15 V to 15 V maximum Trigger level TTL level sensitive Minimum pulse width 50 ns high 50 ns low Latency One scan period maximum Digital Pattern Triggering 8 bit or 16 bit pattern triggering on any of the digital ports Programmable for trigger on equal not equal above or below a value Individual bits can be masked for don t care condition Latency One scan period maximum I...

Страница 43: ... range 30 C to 70 C Storage temperature range 40 C to 80 C Relative humidity 0 to 95 non condensing Mechanical Table 13 Mechanical specifications Vibration MIL STD 810E cat 1 and 10 Dimensions 152 4 mm W x 150 62 mm D 6 0 x 5 93 Weight 147 g 0 32 lbs Signal I O connectors and pin out Table 14 Main connector specifications Connector type 68 pin standard SCSI TYPE III female connector P5 four 40 pin...

Страница 44: ... 30 ACH3 63 ACH11 29 AGND 62 SGND low level sense not for general use 28 ACH4 61 ACH12 27 AGND 60 ACH5 26 ACH13 59 AGND 25 ACH6 58 ACH14 24 AGND 57 ACH7 23 ACH15 56 NC 22 NC 55 NC 21 NC 54 NEGREF 20 POSREF 53 GND 19 5 V see Note 6 52 A1 18 A0 51 A3 17 A2 50 A5 16 A4 49 A7 15 A6 48 B1 14 B0 47 B3 13 B2 46 B5 12 B4 45 B7 11 B6 44 C1 10 C0 43 C3 9 C2 42 C5 8 C4 41 C7 7 C6 40 GND 6 TTL TRG 39 CNT1 5 C...

Страница 45: ...GND 25 ACH6 HI 58 ACH6 LO 24 AGND 57 ACH7 HI 23 ACH7 LO 56 NC 22 NC 55 NC 21 NC 54 NEGREF 20 POSREF 53 GND 19 5 V see Note 6 52 A1 18 A0 51 A3 17 A2 50 A5 16 A4 49 A7 15 A6 48 B1 14 B0 47 B3 13 B2 46 B5 12 B4 45 B7 11 B6 44 C1 10 C0 43 C3 9 C2 42 C5 8 C4 41 C7 7 C6 40 GND 6 TTL TRG 39 CNT1 5 CNT0 38 CNT3 4 CNT2 37 TMR1 3 TMR0 36 GND 2 XAPCR 35 GND 1 XDPCR Note 8 5 V output 20 tolerance 2mA USB pow...

Страница 46: ...H29 32 ACH20 33 ACH28 34 ACH5 35 ACH13 36 ACH4 37 ACH12 38 AGND 39 AGND 40 AGND Table 18 40 pin header connector pinout labeled J5 on the board 32 channel differential mode Pin Function Pin Function 1 ACH11 LO 2 ACH11 HI 3 ACH10 LO 4 ACH10 HI 5 AGND 6 AGND 7 ACH3 HI 8 ACH3 LO 9 ACH2 HI 10 ACH2 LO 11 ACH9 HI 12 ACH9 LO 13 ACH8 HI 14 ACH8 LO 15 ACH1 HI 16 ACH1 LO 17 ACH0 HI 18 ACH0 LO 19 AGND 20 AGN...

Страница 47: ...ACH53 33 ACH37 34 ACH60 35 ACH44 36 ACH52 37 ACH36 38 AGND 39 AGND 40 AGND Table 20 40 pin header connector pinout labeled J6 on the board 32 channel differential mode Pin Function Pin Function 1 ACH19 LO 2 ACH27 LO 3 ACH19 HI 4 ACH27 HI 5 AGND 6 ACH26 LO 7 ACH18 LO 8 ACH26 HI 9 ACH18 HI 10 ACH25 LO 11 AGND 12 ACH25 HI 13 ACH17 LO 14 ACH24 LO 15 ACH17 HI 16 ACH24 HI 17 ACH16 LO 18 AGND 19 ACH16 HI...

Страница 48: ...2 40 pin header connector pin out J8 on the board Pin Function Pin Function 1 13 V see Note 8 2 13 V see Note 8 3 NC 4 NC 5 AGND 6 AGND 7 NC 8 NC 9 NC 10 NC 11 AGND 12 AGND 13 SelfCal 14 SGND low level sense not for general use 15 AGND 16 AGND 17 TTL TRG 18 XDPCR 19 XAPCR 20 GND digital 21 GND digital 22 GND digital 23 NC 24 NC 25 5 V see Note 7 26 AUX PWR output reserved 27 NC 28 NC 29 NC 30 NC 3...

Страница 49: ...USB 2533 User s Guide Specifications 49 TC connector pin out TB7 Figure 20 TC terminal pin out labeled TB7 AGND ACH0 ACH8 ACH1 ACH9 ACH2 ACH10 ACH3 ACH11 TC CH 3 TC CH 2 TC CH 1 TC CH 0 Standoff ...

Страница 50: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com ...

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