Brymen BM857
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Status | supported |
---|---|
Source code | brymen-dmm |
Counts | 50000, 500000(DCV), 999999(Hz) |
IEC 61010-1 | CAT III (1000V) / CAT IV (600V) |
Connectivity | RS232 |
Measurements | voltage, frequency, diode, resistance, continuity, capacitance, current |
Features | autorange, data hold, crest, backlight, true-rms, dBmW1, %4-20mA |
Website | brymen.com |
The Brymen BM857 is a 50000 counts (500000 DC), CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 connectivity.
1: The reference impedance is selectable from 4Ω to 1200Ω. It is not limited to reference impedance of 600Ω.
Hardware
Multimeter:
- Multimeter IC: TBD
- Precision +2.5V Voltage reference: Analog Devices REF43
- True RMS-to-DC converter: Analog Devices AD737
- EEPROM(?): Chip marked S24C0.
- Unidentified: Several 062-JRC chips. These appear to be JFET opamps.
- Unidentified: Two QFP64 chips.
- TODO
Cable:
- TODO
See User_talk:Mrnuke#BM857_PC_Interface_cable
Photos
Multimeter:
Cable:
This can use either the BC-85X or the BC-85X-1 cables. See Device_cables#Brymen_BC-85X(-1).
Currently, mrnuke is working on an improvised USB-to-infrared converter cable. See User_talk:Mrnuke#BM857_PC_interface_cable for more details.
Protocol
TODO
Resources
TODO