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Operating principle
Power supply
8
The input current or voltage to be measured is led to the 23 bit A/D
converter through a protection and signal condition circuit.
The digital output signal of the A/D converter is processed by a
microcontroller.
The microcontroller drives the 5 digit LED display, processes the front
panel membrane keypad, drives the limit relays, the analogue output
and the communication output.
Easy on-site configuration through the front panel membrane keypad
is a major advantage of the microcontroller-based technology. The
configuration parameters: input signal selection, signal filtering,
display scaling, decimal point position, display refresh rate, limit
modes, limit values, etc. are stored in FRAM. The settings are
protected by a two-level password against unauthorized manipulation.
The instrument has two power supply version:
DT4220 E xx xx xx:
DT4220 E xx xx xx PS:
19-50 VDC / 19-35 VAC
90-250 V AC/DC 3.5 VA / 3 W
DT4220 E
3 W / 3.5 VA
20180619-V0
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