Measurement-computing CIO-SSH16 Manuel d'utilisateur Page 1

CIO-SSH16USER’S MANUALRevision 3October, 2000

A floating differential hookup is handy when the signal source is floating with respectto ground, such as a battery, 4-20 mA transmitter or thermocoup

A laboratory instrument with its own wall plug. There are sometimes differences inwall GND between outlets.7

4.0 ARCHITECTUREThere are two types of functional elements on the CIO-SSH16; differential amplifiersand a sample & hold chips (LF398). Together

level signal to the analog input boards single ended inputs, reducing the impact ofEMI or RFI along the signal cable between the CIO-SSH16 and the ana

Figure 4-5. Input Range OptimizationDuring post-processing analysis, the range which provided the best resolution at anypoint in time is instantly ava

Figure 4-6. Input Amplifiers with Sample and Hold ChipsSSH OUT is synchronized to the analog input boards S&H chip and the channel selectMUX. Whe

Figure 4-7. Sample and Hold Timing DiagramNote that Channel 0 of the CIO-SSH16 does not have an LF398 sample and hold chip.That is because there is

To calculate the effect of the droop rate on the accuracy of your measurement, therange of the signal, the resolution of the A/D converter and the tim

5.0 SPECIFICATIONSTypical for 25°C unless otherwise specified.Power consumption+5V 1.0A typical, 1.25A maxAnalog input sectionInput amplifier type IN

Sample / hold sectionSample / hold type LF398Aperture time 250 ns max, 150 ns typicalAperture uncertainty 50 ns typicalAcquisition time 10 µs maxTempe

MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to dataacquisition board model numbers, PCM-DAS08, PCM-D24C3, PCM-DA

6.0 ANALOG ELECTRONICSThis short introduction to the analog electronics most often needed by data acquisitionboard users describes the following:Volta

Figure 6-1. Voltage Divider The object in using a voltage divider is to choose two resistors with the properproportions relative to the full scale of

IMPORTANT NOTE: The resistors, R1 and R2, are going to dissipate all the powerin the divider circuit according to the equation Current = Voltage / Re

A single ended input has no common mode range because there is only one LOWwire, which is assumed to be at the same level at the signal and at the A/D

the designer of the board (or other EE) would be able to translate that into a systemsspecification, most A/D board owners are confused or mislead by

associated with line voltage (60 Hz) would be filtered out but a signal of 25 Hz wouldbe allowed to pass. Also, in a digital circuit, a low pass filt

Resolution is a measure of the ability to differentiate between one voltage and another.Obviously, the more bits of resolution (13 bits = 8192 counts)

For example, if the CIO-DAS16 board is set up to read 0 to 5 volts, then:5 volts / 0.02 Amps = 250 Ohm shunt resistor.So a full 20 mA will register 5

specify the conditions under which the specification was made. That means the PC,the PC's power supply and the connection to the front end.Put s

6.9.4 SMOOTHING DATAIt is not always possible to eliminate all noise, especially with very low level sensors,but noise looks terrible when plotted and

236.9 NOISE ...226.8 CURRENT LOOP (4-20 mA) ...226.7 ENGINEERING

For your notes.26

EC Declaration of ConformityWe, Measurement Computing Corp., declare under sole responsibility that the product:DescriptionPart NumberCIO-SSH16to whic

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

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1.0 SOFTWARE INSTALLATIONBefore installing the board, install and run InstaCal. This package is the installation,calibration and test utility included

There are two cables used with CIO-SSH16; a signal cable and a power cable. Thepower cable (C-PCPOWER-10) is supplied with the CIO-SSH16.The power ca

The SSH16 requires 1 Amp of +5 volt power.You may supply this power from the PC, as werecommend, using the cable supplied, or youmay use an alternate

connected. The nomenclature on the CIO-SSH16 corresponds to CIO-DAS16 signals. 2.4 ANALOG INPUT BOARD SETUPThe analog input board must be configured

3.0 SIGNAL CONNECTION3.1 CONNECTOR DIAGRAMThe CIO-SSH16 inputs are screwterminals which will accept 12-22 AWGwire.Each channel has a screw terminal fo