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SmartReader Data Loggers

1.5

SmartReader 3 Electric Current and Temperature Logger

The SmartReader 3 is a versatile equipment performance logger. It can simultaneously

monitor and record up to three external channels of AC current without having to interrupt

circuitry under test.

Figure 3-1: SmartReader 3

1.5.1 Description

The SmartReader 3 has three current monitoring channels and one internal thermistor

temperature channel. The current-monitoring channels are used with external clamp-on

probes to measure and record alternating current.

The SmartReader 3 is compatible with the following current probes from Amprobe

Instruments:

· A60FL and A70FL probes for 60Hz power systems

· A65FL and A75FL for 50Hz power systems

Use of these probes allows you to measure alternating current of conductors without the need

for breaking circuitry. For information on current ranges and resolutions refer to the

Specifications in this chapter.

How It Works

The SmartReader 3 measures electric current through external current probes. Each current

probe is a transformer with its internal coil serving as the secondary winding and the

current-carrying conductor being measured serving as the primary winding. The output of the

probe (which is the input to the SmartReader 3) is conditioned through internal circuitry. The

probe produces an output of approximately 260 microamps full scale for each range available

on the current probe. Readings from the current probe are scaled into amperage units

through equations (in TrendReader software) that match the current probe and its range

setting.

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ACR Electronics SmartReader Plus Manual do Utilizador Página 28