User Manual

1. General
These LCD-/LED-voltmeter modules are 3 ½ digit modules for
application in Voltmeter and Amperemeter.
They are suitable for measuring DC voltage up to max. 500 V,
depending of the wiring of Ra and Rb. You can also measure
DC current of 0.2 mA up to max. 2 A, depending of the rating
of the used shunts at a max. voltage of the measuring circuit of
35 V DC.
Another application of the modules instead of the described is
not allowed.
The models LDP-340 and LDP-140 are additionally provided
with a backlight.
2. Safety regulations
Before connecting the modules, read and take note of the
following safety regulations and instruction manual.
Damages resulting from failure to observe these safety
precautions are exempt from any legal claims whatever.
* During the measurement of voltages over 30 V
rms
(= 42 V
pp
)or 60 V DC with respective wiring of the module
take care that the circuit, in which you use the module
follows the relevant safety regulations of the EN-61010-1.
* Do not use these modules in installation with overvoltage
category III according IEC 664. The modules are not
protected against arcing.
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