MASTECH MS8250D
 | |
| Status | in progress |
|---|---|
| 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
Multimeter:
- 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
Device, front
PCB, front
Device, inside
USB / Serial interface
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.