Table of Contents
EEVBlog 121GW Multimeter
121GW Product Webpage
121GW User's Manual (08.02.2019)
121GW Circuit Diagram
121GW BLE Packet Protocol Format
121GW Latest Firmware
121GW PC Software
Fuses
- HV110 11A 30kA 1000V HRC (10x38mm)
- HV620 400mA 10kA 1000V HRC (6x32mm)
Features:
- Bluetooth connectivity (multi-device capability)
- Open Source Cross Platform application software (Android + Windows, and more soon)
- 15V Diode Test Voltage (useful for Zeners + LED strings etc)
- VA Power measurement
- Low Burden™ voltage
- Unique burden voltage display
- Micro SD Card data logging + firmware updating
- Other major features include:
- Dual 50,000 count display with bargraph
- 0.05% + 5 Basic DCV Accuracy
- Auto-Hold measurement
- 600V CAT-III with independent UL 61010 certification by ETL
- Safe operation through HRC fuse + TVS + PTC + MOV + Diode Bridge protection
- AD8436 >100KHz True RMS
- 4 x AA battery powered with 500+ hr battery life
- Compact design – 84 × 165 × 59 mm (W × L × H)
- Hackable ST ARM Cortex M3 processor (S-LINK/V2 programmer interface inside)
- Hycon HY3131 chipset
- MAX4238 Low Offset Amplifier for current ranges
- SD Card firmware update
- Full Open Schematic available
- 8ppm ADR3412 voltage reference
The meter is manufactured by UEI Test Instruments, a reputable US based designer and manufacturer of high quality test gear. The design work was primarily done by UEI, but with a great deal of design input and direction from Dave. The meter is manufactured in South Korea.
NOTE: The meter may come with either Brymen (gold) probes or UEI (nickel) probes depending upon availability at the time. Both are high quality silicone rubber probes.