ACR Electronics SmartReader Plus Manual de usuario descargar pdf (Pagina 64)

SmartReader Data Loggers

1.11

SmartReader 9 Pulse Logger

The SmartReader 9 is a three-channel, multi-purpose counter and logger. With it you can

monitor a wide variety of measurement parameters.

Figure 9-1: SmartReader 9

1.11.1 Description

Featuring two input channels configured for easy interface with common switch and

transducer outputs, SmartReader 9 has the capability to count, totalize, and record voltage

pulses and switch contact closure frequency as well as monitor ambient temperature from -40

to 70°C (-40 to 158°F).

1.11.2 How the SmartReader 9 Counts

The SmartReader 9 can count and log data from either of its two external input channels. The

channels can count the opening and closing of external switch contacts and/or the occurrence

of DC voltage pulses.

The SmartReader 9 keeps track of the number of times a switch opens and closes by

continuously maintaining a voltage potential across the input terminals. Figure 9-3 shows a

simple circuit for monitoring such a switch. Every time the voltage potential changes from high

to low (i.e. switch opening) and back to high again (i.e. switch closing) the logger registers a

count of '1.'

Using the standard 32/sec. counting channel in the Normal Rate mode, the logger can count

up to 256 switch contact closures over any eight second period (or an average of 32 closures

per second). At the end of every eight second period the total number of counts is stored in a

memory buffer. If the logger's sampling rate is set for eight seconds this total is immediately

saved to memory as a reading. If the sampling rate is more infrequent than eight seconds the

total number of counts for each eight-second period is added up and then averaged for the

amount of the sampling rate.

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ACR Electronics SmartReader Plus Manual de usuario Pagina 64