Difference between revisions of "Brymen BM857"

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'''Cable:'''
'''Cable:'''


We don't have the BC-85X cable for this device. The BC-85Xa, which we tried, is not compatible this multimeter.
This can use either the BC-85X or the BC-85X-1 cables. See [[Device_cables#Brymen_BC-85X(-1)]].
The BC-85-1 seems to work acceptably well.
 
Currently, mrnuke is working on an improvised USB-to-infrared converter for development purposes. If you have a BC-85X you'd like to donate, contact mrnuke on #sigrok.
Currently, mrnuke is working on an improvised USB-to-infrared converter cable. See [[User_talk:Mrnuke#BM857_PC_interface_cable]] for more details.
See [[User_talk:Mrnuke#BM857_PC_interface_cable]] for more details.


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<gallery>

Revision as of 17:51, 2 February 2013

Brymen BM857
Bm 857 mugshot 500000.png
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:

  • Box

  • Mughsot

  • Device, back

  • Package contents

  • Probe cable storage clips

  • LCD Backlight

  • Holster removed, front

  • Holster removed, back

  • Case opened

  • Rear cover

  • Front cover

  • Rear cover, PCB removed

  • Upper PCB, top

  • Upper PCB, bottom

  • Main PCB, top

  • Main PCB, bottom

  • High voltage isolation slots.

  • High voltage isolation walls, designed to fit in the isolation slots.

  • Input circuit near the V jack

  • Microcontroller (right), and LCD controller (left)

  • Microcontroller (right), and LCD controller (left)

  • LCD controller and connector

  • ICs on the main PCB

  • More ICs

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.

  • Cable hookup

  • Cable hookup, detail

  • Cable hookup, closeup

  • Cable hookup, top detail

Protocol

TODO

Resources

TODO

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