Gantner e.bloxx A5CR, Manual

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e.bloxx A5-1CR
MEASUREMENTS
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HB_EBLOXX-A5CR_E_V11.doc
Gantner Instruments Test & Measurement GMBH
4. MEASUREMENTS
4.1. General
The e.bloxx A5-1CR has 2 analog inputs and one digital in- and one digital output. The configuration of the inputs and
outputs is done with the Configuration Software ICP 100
as required by the application.
Analog Input
The analog input collects and processes the signals of Cryo sensors like Cernox or TVO and resistors. The acquisition of
various measuring values with these sensors has the following principles of measurement:
-
Measurement of resistance
This measurement is carried out in 4-wire technique.
Digital Output
The digital output of the e.bloxx can be configured as threshold switch with definable threshold-settings and may then
be used e.g. as an alarm or limit monitor of the analog input.
Since the Open Collector output is "passive" the process of external elements always require an external voltage. In
case of larger loads this current supply should be independent of the module supply. When connecting inductive loads a
freewheeling diode is recommended in order to prevent possible disturbances e.g. by induced voltage (see picture 4.1).
To the digital output you can directly connect: signal lamps, small relays, switching relays for larger loads, acoustic
signal installations, buzzers or beepers etc., as long as the connected loads do not exceed the values described in the
Technical Specifications.
Picture 4.1. - Wiring of the Digital Output