Difference between revisions of "Brymen BM857"
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[[File:Bm_857_mugshot_500000.png| | {{Infobox multimeter | ||
| image = [[File:Bm_857_mugshot_500000.png|180px]] | |||
| name = Brymen BM857 | |||
| status = supported | |||
| source_code_dir = brymen-dmm | |||
| counts = 50000, 500000(DCV), 999999(Hz) | |||
| categories = CAT III (1000V) / CAT IV (600V) | |||
| connectivity = RS232 | |||
| measurements = voltage, frequency, diode, resistance, continuity, capacitance, current | |||
| 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] | |||
}} | |||
The | 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 == | ||
'''Multimeter:''' | '''Multimeter:''' | ||
* TODO | * '''Multimeter IC''': TBD | ||
* '''Precision +2.5V Voltage reference''': [http://www.analog.com/en/special-linear-functions/voltage-references/ref43/products/product.html Analog Devices REF43] | |||
* '''True RMS-to-DC converter''': [http://www.analog.com/en/special-linear-functions/rms-to-dc-converters/ad737/products/product.html Analog Devices AD737] | |||
* '''EEPROM(?)''': Chip marked S24C0. | |||
* '''Unidentified''': Several 062-JRC chips. These appear to be JFET opamps. | |||
* '''Unidentified''': Two QFP64 chips. | |||
* TODO | |||
'''Cable:''' | '''Cable:''' | ||
* TODO | * TODO | ||
See [[User_talk:Mrnuke#BM857_PC_Interface_cable]] | |||
== Photos == | == Photos == | ||
Line 16: | Line 35: | ||
<gallery> | <gallery> | ||
File:Bm857_box_left.png|<small>Box</small> | File:Bm857_box_left.png|<small>Box</small> | ||
File:Bm_857_mugshot_500000.png|<small>Mughsot | |||
File:Bm857_back.jpg|<small>Device, back</small> | |||
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_front_noholster.png|<small> | File:Bm857_lcd_backlit.jpg|<small>LCD Backlight</small> | ||
File:Bm857_back_noholster.jpg|<small> | File:Bm857_front_noholster.png|<small>Holster removed, front</small> | ||
File:Bm857_back_noholster.jpg|<small>Holster removed, back</small> | |||
File:Bm857_opened.jpg|<small>Case opened</small> | File:Bm857_opened.jpg|<small>Case opened</small> | ||
File:Bm857 inside backside.jpg|<small>Rear | File:Bm857 inside backside.jpg|<small>Rear cover</small> | ||
File:Bm857_cover_front.jpg|<small>Front cover</small> | File:Bm857_cover_front.jpg|<small>Front cover</small> | ||
File:Bm857_cover_back.jpg|<small> | File:Bm857_cover_back.jpg|<small>Rear cover, PCB removed</small> | ||
File:Bm857_upperpcb_top.jpg|<small>Upper PCB, top</small> | File:Bm857_upperpcb_top.jpg|<small>Upper PCB, top</small> | ||
File:Bm857_upperpcb_bottom.jpg|<small>Upper PCB, bottom</small> | File:Bm857_upperpcb_bottom.jpg|<small>Upper PCB, bottom</small> | ||
Line 39: | Line 60: | ||
File:Bm857_ICs_2.jpg|<small>More ICs</small> | File:Bm857_ICs_2.jpg|<small>More ICs</small> | ||
</gallery> | </gallery> | ||
'''Cable:''' | '''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. | |||
Newer models (BM850a/BM850s) are said to require the BU-85Xa adapter. These different versions of meters and adapters are not compatible to each other. | |||
<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 == | ||
Serial communication (genuine COM port), textual presentation of measurement values (floating point, normalized mantissa plus exponent), number codes for current meter's function and thus measured unit, variable length records with control chars in the header/footer (DLE, STX/ETX) around the mode number and value's text, up to 22 bytes per DMM packet. See resources below for a full description of the protocol. | |||
== Resources == | == Resources == | ||
BM850/BM850a/BM850s protocol documentation [http://brymen.com/product-html/PD02BM850s_protocolDL.html download area] and [http://brymen.com/product-html/images/DownloadList/ProtocolList/BM850-BM850a-BM850s_List/BM850-BM850a-BM850s-500000-count-DMM-protocol-BC85X-BC85Xa.zip ZIP with PDF] (worked as of 2019-06-10, vendor may change that) | |||
[[Category:Device]] | [[Category:Device]] | ||
[[Category:Multimeter]] | [[Category:Multimeter]] | ||
[[Category: | [[Category:Supported]] |
Revision as of 10:22, 10 June 2019
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.
Newer models (BM850a/BM850s) are said to require the BU-85Xa adapter. These different versions of meters and adapters are not compatible to each other.
Protocol
Serial communication (genuine COM port), textual presentation of measurement values (floating point, normalized mantissa plus exponent), number codes for current meter's function and thus measured unit, variable length records with control chars in the header/footer (DLE, STX/ETX) around the mode number and value's text, up to 22 bytes per DMM packet. See resources below for a full description of the protocol.
Resources
BM850/BM850a/BM850s protocol documentation download area and ZIP with PDF (worked as of 2019-06-10, vendor may change that)