Difference between revisions of "Voltcraft VC-940"
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* [http://www.ti.com/product/msp430fe425 Texas Instruments MSP430FE425] 16 bit microcontroller for energy meters with 16K flash and 512B RAM on board | * [http://www.ti.com/product/msp430fe425 Texas Instruments MSP430FE425] 16 bit microcontroller for energy meters with 16K flash and 512B RAM on board | ||
* [http://www.holtek.com.tw/english/docum/consumer/1621.htm HOLTEK HT1621B] 128 (32 x 4) pattern multi-function LCD driver | * [http://www.holtek.com.tw/english/docum/consumer/1621.htm 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:''' | '''RS232 cable:''' | ||
| Line 57: | Line 58: | ||
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123297-an-01-ml-VOLTCRAFT_VC940_DMM_de_en_fr_nl.pdf Manual] | * [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123297-an-01-ml-VOLTCRAFT_VC940_DMM_de_en_fr_nl.pdf Manual] | ||
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123297-up-01-en-VC940DMM_WIN7_32_64bit_V3_00.zip Vendor software] | * [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123297-up-01-en-VC940DMM_WIN7_32_64bit_V3_00.zip Vendor software] | ||
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123297-an-01-en-Kalibrieranleitung_VC940.pdf Calibration instructions] | |||
* [http://elektrotanya.com/unit_multimeter_vc940.pdf/download.html Schematic] | * [http://elektrotanya.com/unit_multimeter_vc940.pdf/download.html Schematic] | ||
Latest revision as of 01:00, 16 October 2015
 | |
| 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.