MASTECH MS8250D

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MASTECH MS8250D
Mastech ms8250d mugshot.png
Status supported
Source code serial-dmm
Counts 6600
IEC 61010-1 CAT III (1000V) / CAT IV (600V)
Connectivity USB/serial
Measurements voltage, current, resistance, capacitance, frequency, duty cycle, diode, continuity
Features autorange, true-rms, data hold, min/max, relative, bargraph, backlight, ncv
Website mastech-group.com

The MASTECH MS8250D is a 6600 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with USB connectivity.

See MASTECH MS8250D/Info for more details (such as lsusb -v output) about the device.

Hardware

  • CP2102 USB to UART bridge controller
  • HY11P14 embedded 18-Bit Σ∆ADC 8-Bit RISC-like mixed signal microcontroller (datasheet)
  • DTA0660L multimeter chip
  • ATMLH538 EEPROM

Photos

Protocol

The chip periodically sends 18-byte packets at 2400 baud, 8n1. There is no checksum or CRC in the packet.

The payload is composed of a 1-1 mapping of the LCD segments.

Resources