Voltcraft VC-870
Revision as of 20:53, 29 December 2014 by Uwe Hermann (talk | contribs)
| File:Voltcraft vc870.png | |
| Status | planned |
|---|---|
| Source code | serial-dmm |
| Counts | 40000 |
| IEC 61010-1 | CAT III (1000V) / CAT IV (600V) |
| Connectivity | RS232 / USB |
| Measurements | voltage, resistance, diode, continuity, capacitance, frequency, current, temperature, loop current, power + apparent power, power factor + frequency, effective voltage + current |
| Features | autorange, hold, relative, backlight, min, max, minmax, true-rms, bargraph |
| Website | conrad.de |
The Voltcraft VC-870 is a 40000 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.
Hardware
Multimeter:
We don't have teardown photos yet, but this article (see also this photo) claims that the DMM contains the following components:
- 4 3/4 and 5 3/4 digits ADC: Cyrustek ES51966 (datasheet)
- Microcontroller: Texas Instruments MSP430
- Voltage regulators: TPS76301, 7201u55
- EEPROM: Atmel "748"
- True RMS-to-DC converter: Analog Devices AD737 (datasheet)
RS232 cable:
USB cable:
Photos
Multimeter:
RS232 cable:
See Device cables#UNI-T_UT-D02.
USB cable:
See Device cables#UNI-T_UT-D04.
Protocol
Some (partially incorrect and also incomplete) protocol docs are available from the vendor.
The interface parameters for the UNI-T UT-D02 serial cable are 9600/8n1.
A packet consists of 23 bytes.
Notes:
- The bargraph value (only shown on the LCD for voltage, current, and resistance mode) is not contained in the protocol.
- The auto-poweroff feature which powers the device off after 15 minutes is always disabled when the PC interface is "active" (i.e. the user pressed the REL/PC button for 1 second). Thus the respective "auto-poweroff" bit/flag, which is contained in the protocol, always has the same value.
- The backlight status (on/off) is contained in the protocol.