Voltcraft VC-940
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 | |
| 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:
USB cable:
Photos
Multimeter:
PCB, top
PCB, bottom
RS232 cable:
See Device cables#UNI-T_UT-D02.
USB cable:
See Device cables#UNI-T_UT-D04.
Protocol
See UNI-T UT71x series#Protocol.