Brymen BM869
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 | |
| Status | supported |
|---|---|
| Source code | brymen-bm86x |
| Counts | 50000, 500000(DCV), 99999(Hz) |
| IEC 61010-1 | CAT IV (1000V) |
| Connectivity | Infrared (USB) |
| Measurements | voltage, current, frequency, duty cycle, resistance, continuity, conductance, diode, capacitance, temperature |
| Features | autorange, data hold, min/max/avg, crest, backlight, true-rms, dBm, %4-20mA, VFD |
| Website | brymen.com |
The Brymen BM869 is a 50000 counts (500000 DC), CAT IV (1000V) dual display handheld digital multimeter with USB connectivity.
Hardware
Multimeter:
- Multimeter IC: BTC AD-85-4 (hidden under metal shielding)
- Precision +2.5V Voltage reference: Analog Devices REF43
- True RMS-to-DC converter: Analog Devices AD636
- 4 Kb EEPROM: Seiko S-24CS04A.
- J-FET input op-amp: Three NMJ062 chips marked 062-JRC.
- Rail-to-Rail op-amp: Two Microchip MCP6021 probably dedicated to the two temperature sensors.
Cable: The Brymen BC-86X cable is designed to be used with the Brymen BM867 and BM869. See Device_cables#Brymen_BU-86X.
Photos
Multimeter:
Unboxing
Mughsot
Device back
Holster removed, front
Holster removed, back
Battery compartment
Opened, PCB top
Opened, PCB bottom
Separated PCB
PCB details
LCD segments
LCD Backlight
Cable:
Cable hookup
Cable hookup, closeup
Protocol
It is described by Brymen in a document named 500000count-professional-dual-display-DMMs-protocol.pdf which is part of their BM860-Bs86x windows software distribution.