Difference between revisions of "Brymen BM857"

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{{Infobox multimeter
{{Infobox multimeter
| image           = [[File:Bm_857_mugshot_500000.png|180px]]
| image           = [[File:Bm_857_mugshot_500000.png|180px]]
| name             = Brymen BM857
| name           = Brymen BM857
| status           = planned
| status         = planned
| source_code_dir =
| source_code_dir =
| counts           = 50000, 500000(DCV), 999999(Hz)
| counts         = 50000, 500000(DCV), 999999(Hz)
| categories       = CAT III (600V)
| categories     = CAT III (1000V) / CAT IV (600V)
| connectivity     = Infrared RS232
| connectivity   = RS232
| measurements     = voltage, frequency, diode, resistance, continuity, capacitance, current
| measurements   = voltage, frequency, diode, resistance, continuity, capacitance, current
| features         = autorange, data hold, crest, backlight, true-rms, AC+DC
| features       = autorange, data hold, crest, backlight, true-rms
| website         = [http://brymen.com/product-html/cata850a/Bm850as.htm brymen.com]
| website         = [http://brymen.com/product-html/cata850a/Bm850as.htm brymen.com]
}}
}}
The [http://brymen.com/product-html/cata850a/Bm850as.htm Brymen BM857] is a 50000 counts (500000 DC), CAT III handheld digital multimeter with infrared connectivity.
 
The '''Brymen BM857''' is a 50000 counts (500000 DC), CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 connectivity.


== Hardware ==
== Hardware ==
Line 23: Line 24:
* '''Unidentified''': Two QFP64 chips.
* '''Unidentified''': Two QFP64 chips.
* TODO
* TODO


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

Revision as of 09:30, 28 November 2012

Brymen BM857
Bm 857 mugshot 500000.png
Status planned
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
Website brymen.com

The Brymen BM857 is a 50000 counts (500000 DC), CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 connectivity.

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:

We don't have a cable (BC-85Xa) for this device. Currently, mrnuke is working on an improvised USB-to-infrared converter for development purposes. If you have a BC-85Xa you'd like to donate, contact mrnuke on #sigrok. See User_talk:Mrnuke#BM857_PC_interface_cable for more details.

Protocol

TODO

Resources

TODO