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         = supported
| source_code_dir =
| source_code_dir = brymen-dmm
| 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, dBmW<sup>1</sup>, %4-20mA
| 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.
<sup>1</sup>: The reference impedance is selectable from 4Ω to 1200Ω. It is not limited to reference impedance of 600Ω.
== Hardware ==
== Hardware ==


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* '''Unidentified''': Two QFP64 chips.
* '''Unidentified''': Two QFP64 chips.
* TODO
* TODO


'''Cable:'''
'''Cable:'''
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File:Bm857_package_contents.jpg|<small>Package contents</small>
File:Bm857_package_contents.jpg|<small>Package contents</small>
File:Bm857_cable_clips.jpg|<small>Probe cable storage clips</small>
File:Bm857_cable_clips.jpg|<small>Probe cable storage clips</small>
File:Bm857_lcd_backlit.jpg|<small>LCD Backlight</small>
File:Bm857_front_noholster.png|<small>Holster removed, front</small>
File:Bm857_front_noholster.png|<small>Holster removed, front</small>
File:Bm857_back_noholster.jpg|<small>Holster removed, back</small>
File:Bm857_back_noholster.jpg|<small>Holster removed, back</small>
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'''Cable:'''
'''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.
This can use either the BC-85X or the BC-85X-1 cables. See [[Device_cables#Brymen_BC-85X(-1)]].
See [[User_talk:Mrnuke#BM857_PC_interface_cable]] for more details.
 
Currently, mrnuke is working on an improvised USB-to-infrared converter cable. See [[User_talk:Mrnuke#BM857_PC_interface_cable]] for more details.
 
<gallery>
File:Brymen_br85x_dmm_hookup_all.jpg|<small>Cable hookup</small>
File:Brymen_br85x_dmm_hookup_side.jpg|<small>Cable hookup, detail</small>
File:Brymen_br85x_dmm_hookup_angle.jpg|<small>Cable hookup, closeup</small>
File:Brymen_br85x_dmm_hookup_top.jpg|<small>Cable hookup, top detail</small>
</gallery>


== Protocol ==
== Protocol ==
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[[Category:Device]]
[[Category:Device]]
[[Category:Multimeter]]
[[Category:Multimeter]]
[[Category:Planned]]
[[Category:Supported]]

Revision as of 18:51, 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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