{{ :wiki:121gw.jpg?nolink&200|}}====== EEVBlog 121GW Multimeter ======
[[https://www.eevblog.com/product/121gw/|121GW Product Webpage]]\\
{{ :wiki:manual-29-january-2019-1.pdf |121GW User's Manual (08.02.2019)}}\\
{{ :wiki:121gw-eevblog-circuit-diagram.pdf |121GW Circuit Diagram}}\\
{{ :wiki:revised-packet-format-blob-v2.pdf |121GW BLE Packet Protocol Format}}\\
[[https://www.eevblog.com/product/121gw/#tab-lumia-tab-firmware|121GW Latest Firmware]]\\
[[https://www.eevblog.com/product/121gw/#tab-lumia-tab-software|121GW PC Software]]

===== Fuses =====

[[https://www.eevblog.com/product/multimeter-fuse-pack/|121GW Multimeter 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.