Measurement-computing CIO-DAS16Jr/16 Uživatelský manuál Strana 1

CIO-DAS16Jr/16USER’S MANUALRevision 4March, 2001

If both AC and DC readings are 0.00 volts, you may have a system with common grounds. However, since voltmeterswill average out high frequency signals

2.2.8 Large Common Mode VoltagesIf the ground differential is large enough, the CIO-DAS800’s +/- 10V common mode range will be exceeded. In this caset

The following sections depicts recommended input wiring schemes for each of the seven possible inputconfiguration/grounding combinations.NOTE: For si

2.3.3 Common Mode Voltage < +/-10V/Single-Ended InputsThis is not a recommended configuration. In fact, the phrase common mode has no meaning in a

2.3.6 Isolated Grounds / Single-Ended InputsSingle-ended inputs can be used to monitor isolated inputs, though the use of the differential mode will i

3 REGISTER ARCHITECTURE 3.1 CONTROL & DATA REGISTERSThe CIO-DAS16Jr/16 is controlled and monitored by writing to and reading from 16 consecuti

Table 3-2. Register SummaryPacer Clock Contol (8254)None. No read back on 8254BASE + 15CTR 2 Data - A/D Pacer CTR 2 Data - A/D Pacer ClockBASE + 14CT

3.3 CHANNEL MUX SCAN LIMITS REGISTERBASE ADDRESS + 2CH L1CH L2CH L4CH L8CH H1CH H2CH H4CH H801234567A read and write register.READThe current channel

3.5 STATUS REGISTERBASE ADDRESS + 8CH1CH2CH4CH8INTMUXU/BEOC01234567A read mostly, one-function-write register.READEOC = 1, the A/D converter is busy.

Table 3-3. A/D Conversion Source CodingStart on Pacer Clock Pulse (CTR 2 OUT, no external access)11Start on rising TRIGGER (Digital input 0, Pin 25)01

LIFETIME WARRANTYEvery hardware product manufactured by Measurement Computing Corp. is warranted against defects in materials or workmanship forthe li

3.8 ANALOG INPUT RANGE REGISTERBASE ADDRESS + 11G0G1Uni/BipXXXXX01234567Table 3-4. Range Coding70 to 1.25V11160 to 2.5V01150 to 5V10140 to 10V0013±1.

The three 8254 counter/timer data registers may be written to and read from. Because each counter will count as high as65,535, it is clear that loadi

4 SPECIFICATIONS POWER CONSUMPTION+5V quiescent 850 mA typical, 1250 mA maxANALOG INPUT SECTIONA/D converter type AD7805PBResolution 16 bitsNumbe

COUNTER SECTIONCounter type 82C54Configuration 3 down counters, 16 bits eachCounter 0 - independent, available to user Source: programmable: external

For your notes.20

EC Declaration of ConformityWe, Measurement Computing Corp., declare under sole responsibility that the product:DescriptionPart NumberCIO-DAS16Jr/16to

Measurement Computing Corporation16 Commerce Boulevard,Middleboro, Massachusetts 02346(508) 946-5100Fax: (508) 946-9500E-mail: info@measurementcomputi

TABLE OF CONTENTS184 SPECIFICATIONS ...173.13 INPUT...

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1 INSTALLATION1.1 SOFTWAREBefore installing the board, install and run InstaCal. This package is the installation, calibration and test utility includ

1.5 INSTALLING THE BOARDHaving configured the board’s switches and jumpers, it is now time to install the board into an ISA slot in the PC.1. Turn th

2 SIGNAL CONNECTIONS 2.1 CONNECTOR DIAGRAMThe CIO-DAS16Jr/16 analog connector is a male 37-pin, D-type connector accessible from the rear of the PC t

2.2.1 Single-Ended InputsIn a single-ended input circuit, the voltagebetween the input signal terminal and ground isamplified. In this mode, the CIO-D

Before describing grounding and isolation, it is important to understand the concepts of common mode, and commonmode range. Common mode voltage is dep