Measurement-computing PCM-DAS16D/12 Manual do Utilizador

PCM-DAS16D/12PCM-DAS16S/12ComputerBoards, Inc.Revision 4July, 1999

WARNINGDo not exceed the input specifications. There are no socketed or user serv-iceable parts in a PCM board. Any repair will be expensive.Analog

4 ANALOG CONNECTIONS 4.1ANALOG INPUTSAnalog signal connection is one of the most challenging aspects of applying adata acquisition board. If you

4.1.1 Single-Ended InputsA single-ended input measures the voltage between the input signal andground. In this case, in single-ended mode the PCM-DAS

4.1.2 Differential InputsDifferential inputs measure the voltage between two distinct input signals.Within a certain range (referred to as the common

Before moving on to the discussion of grounding and isolation, it is importantto explain the concepts of common mode, and common mode range (CMRange).

1 The PCM-DAS16x/12 and the signal source may have the same (or com-mon) ground. This signal source may be connected directly to the PCM-DAS16x/12.2 T

WARNINGIf either the AC or DC voltage is greater than 10 volts, donot connect the PCM-DAS16x/12 to this signal source. Youare beyond the boards usable

As a safe rule of thumb, if your signal source or sensor is not connecteddirectly to an LLGND pin on your PCM-DAS16x/12, it’s best to assume thatyou

NOTERelying on the earth prong of a 120VAC for signal groundconnections is not advised.. Different ground plugs may havelarge and potentially even dan

4.2WIRING CONFIGURATIONSCombining all the grounding and input type possibilities provides us with the follow-ing potential connection configurations.

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

However the reverse is not true. The diagram below shows a recommended connec-tion diagram for a common ground / single-ended input system.4.2.2 Commo

damage should occur and depending on the overall accuracy you require, you mayreceive acceptable results. 4.2.4 Common Mode Voltage < ±10V /Differe

reduce the overall common mode voltage, or add isolated signal conditioning betweenthe source and your board. 4.2.6 Isolated Grounds / Single-Ended I

4.2.7 Isolated Grounds / Differential InputsOptimum performance with isolated signal sources is assured with the use of the dif-ferential input settin

5 PROGRAMMING & APPLICATIONS Your PCM-DAS16x/12 is now installed and ready for use. Although thePCM-DAS16x/12 is part of the larger DAS16 fam

6 CALIBRATION The PCM-DAS16x/12 is calibrated via software. The case may not beopened and there are no parts inside which you can service. There

7 I/O ADDRESS MAP & REGISTER FUNCTIONS A base address register controls the beginning, or 'Base Address' of the I/Oaddresses occupie

BASE + C Counter 2 Read | LoadBASE + E None | Counter ControlInterrupt Source ControlThe interrupt source is controlled by three bits.INT2 INT1 INT0 S

01010 to 5 V01100 to 2.5 V01110 to 1.25 VThe digital I/O lines may be set as follows via 2 control bits.UDIR LDIR Bits 7:4 Bits 3:00 0 Input Input0 1

8 CABLE & SCREW TERMINAL BOARD The PCM-C37/33 is a 10 inch 33 conductor cable assembly for use with 33pin PCMCIA cards. The PCM-C37/33 has a

269 SPECIFICATIONS ...258 CABLE & SCREW TERMINAL BOARD ...22 7.1 CONTROL REGISTERS ...

9 SPECIFICATIONS Typical for 25OC unless otherwise specified. POWER CONSUMPTION+5V quiescent 65 mA typical, 90 mA max+5V during CIS read 75 mA t

Throughput (post-process calibration) 100k samples/secRelative Accuracy (software calibrated) ±1 LSBDifferential Linearity error ±1 LSBIntegral Linear

COUNTER SECTIONCounter type 82C54Configuration 3 down counters, 16 bits eachCounter 0 - User counter 1Source: Programmable external (Ctr 1 Clk)or 100k

Input high voltage 2.0V minOutput low voltage 0.4V maxOutput high voltage 3.0V minCrystal Oscillator:Frequency 10 MHzFrequency accuracy 100 ppmENVIRON

30

EC Declaration of ConformityWe, ComputerBoards, Inc., declare under sole responsibility that the product:DescriptionPart NumberPCMCIAAnalog Input Boar

ComputerBoards, Inc.16 Commerce BoulevardMiddleboro, MA 02346Tel: (508) 946-5100Fax: (508)946-9500www.computerboards.com

1 INTRODUCTION The PCM-DAS16x/12 is a data acquisition and control board for IBM PCcompatible computers with PCMCIA type 2 slots. The heart of th

2 INSTALLATION 2.1INSTALL THE INSTACAL™ SOFTWARE PACKAGEInstaCal is the installation, calibration and test software supplied with yourdata acquis

In order to easily test your installation, it is recommended that you installInstaCal, the installation, calibration and test utility that was supplie

3 I/O CONNECTOR The PCM-DAS16S/12 has 16 single ended analog inputs. The PCM-DAS16D/12 has eight differential inputs. Both boards have an analog

Analog signals should be connected with the high side to the numbered ana-log input and the low side to the low input or the analog ground. Please se