Voltcraft VC-940¶


Status	supported
Source code	serial-dmm
Counts	40000/4000
IEC 61010-1	CAT III (1000V) / CAT IV (600V)
Connectivity	RS232 / USB
Measurements	voltage, resistance, diode, continuity, capacitance, frequency, duty cycle, current, temperature
Features	autorange, hold, relative, min/max, bargraph, backlight, true-rms
Website	conrad.de

The Voltcraft VC-940 is a 40000/4000 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

This is a rebadged UNI-T UT71E.

See UNI-T UT71x series for information common to all devices in this series.

Hardware¶

Multimeter:

Cyrustek ES51966F multimeter chip
Texas Instruments MSP430F149 16 bit microcontroller with 60K flash and 2K RAM on board
Texas Instruments MSP430FE425 16 bit microcontroller for energy meters with 16K flash and 512B RAM on board
HOLTEK HT1621B 128 (32 x 4) pattern multi-function LCD driver
PCB markings: The silkscreen reads "71E V20051120-3", but the correct "940" model indication is apparently added manually by UNI-T using a sticker.

RS232 cable: