ACR Electronics SmartReader Plus Manuel d'utilisateur télécharger pdf (Page 65)

SmartReader Data Logger

Counting voltage pulses (also called logic inputs) is similar to counting switch contacts, only

instead of the logger supplying the voltage potential, the logger detects the voltage level of the

pulse. The pulse must have a low level voltage less than 0.5 volts DC and the high level

voltage must be from 4.5 to 24 volts DC.

The minimum pulse length and minimum interval between pulses must be 4 milliseconds. For

the SmartReader 9 to register a count of '1,' the input voltage must go from a low level to a

high level and back again to a low level.

You can configure each of the two counting channels for any one of three possible rates: 32,

64, and 128 Hz (pulses per second). When the rate select jumper is attached to the 32/sec.

setting, the logger can count up to 256 pulses every eight seconds. If the number of counts

exceeds 256, the counting will restart from zero thereby producing an incorrect reading.

1.11.3 Quick-Start Tutorial

By setting up the following simple application, you can gain a basic understanding of how this

logger works. The concepts learned here will help you use your SmartReader 9 correctly for

your own applications.

This section assumes you are familiar with the basic operation of TrendReader software. If

you need help, please refer to the TrendReader guide.

1. Start TrendReader software and connect the SmartReader 9 to your PC via the interface

cable.

2. Select equation 34 for the Pulse 1 channel, ensure that the channel is enabled, and

choose Normal counting mode (do not activate the logger's Accumulate mode). Save the

setup to the logger.

3. Observe the Realtime reading. It should be 0.0 Hz.

Figure 9-2: SmartReader 9 Test Configuration

4. Connect the three wires to your logger as shown in Figure 9-2 with one wire going from

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ACR Electronics SmartReader Plus Manuel d'utilisateur Page 65