Test Set CMC 156
14
3.1.4 Measuring
Module
The measuring module for analog signals primarily consists of a laser trimmed
high-precision voltage reference, a 16-bit A/D converter with series-connected
multiplexer and the appropriate input circuits (precision voltage divider, filter).
The input signals V
dc
and I
dc
, the output voltages, amplifier temperatures, etc.
are measured here. Behind the I
dc
input a PTC thermistor is located as
reversible fuse.
The binary inputs are read via opto-isolators having a time resolution of 100
μ
s
and are divided in two isolated groups (group 1: binary inputs 1..4; group 2:
binary inputs 5..10). The binary inputs can be configured by means of the
CMC software. You can specify if floating or potential-carrying contacts are to
be connected. For potential-carrying contacts, the expected rated voltage may
be specified (individually for each binary input) and the operating threshold of
the binary inputs may be set.
The operating threshold is set in % of the nominal voltage.
1
To isolate single binary inputs against each, other additional opto-Isolators
may be connected in series to the binary inputs.
For ordering notes see section 7.2, „Ordering Notes“.
The configuration of the binary inputs in the CMC software is described in your
CMC software user's manual, section "Configuring the binary inputs".
The binary inputs 1..10 can also be used as counter inputs for input
frequencies of up to 3kHz.
Additionally, for meter testing with higher frequencies
(e.g. with reference meters), two counter inputs for input frequencies of up to
100kHz are available at the ‘ext. Interf.’ interface.
1
Range: 10 to 71%; valid for binary inputs 1-10.
Summary of Contents for CMC 156
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