Voltcraft VC-920¶


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
Website	conrad.de

The Voltcraft VC-920 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 UT71A.

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

Hardware¶

Multimeter:

44000/440000-count dual-slope ADC: Cyrustek ES51966P (datasheet)
16-bit microcontroller: Texas Instruments MSP430F149 (markings "TI 87E817T G4 LSD0007 REV N") (datasheet)
128 (32 x 4) pattern multi-function LCD driver': Holtek HT1621B (datasheet)
PCB markings: The silkscreen reads "71A V20051010-6", but the correct "920" model indication is apparently added manually by UNI-T using a sticker.