ACR Electronics SmartReader Plus Manual de usuario descargar pdf (Pagina 66)

SmartReader Data Loggers

"Rate Select 1" to "32/second," one wire from "Rate Select 2" to "64/second" and the third

wire from "Pulse Input 1" left unconnected.

5. Now tap (touch and release) the third wire to the screw head of the terminal marked "

Common." Do this continuously at a rate of about once per second. The Realtime

reading from the "Pulse 1" channel should be close to "1.0 Hz" depending on how

accurately and steadily you are tapping.

6. Try varying the rate at which you tap to see how the Realtime display changes.

Each time you tap the wire to the "Common" terminal you are simulating a switch opening and

closing. Note that these readings are in Hertz (Hz) which refers to the number of pulses or

switch contact closures the logger detects per second. This is because the logger totalizes

the number of contact closures (or pulses) it detects in periods of eight seconds at a time. It

then expresses this in Hertz (or pulses per second).

Figure 9-3: Counting Switch Contact Closures

1.11.4 Using Your SmartReader 9

The following steps will guide you through the procedure of setting up and using your

SmartReader 9 Pulse Logger.

1. Always make sure that the circuit you want to monitor will be compatible for use with your

SmartReader 9. Refer to the Specifications section for details on the type of switches

and logic signals that will work. Key things to note are:

· If you are going to be monitoring the opening and closing of switches, then there must

not be a power source connected to the contacts (the contacts must be "dry").

· If you wish to monitor a circuit that produces pulsed signals, then the low level must

fall between 0 and 0.5 volts DC and the high level must be between 4.5 volts and 24

volts DC.

· The frequency of the pulses or contact closures that you want to monitor must not

exceed the maximum capability of the SmartReader 9 which is 1024 over any eight

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ACR Electronics SmartReader Plus Manual de usuario Pagina 66