A digital multimeter teardown

Kerry D. Wong recently reviewed UNI-T’s 5 1/2 digit UT8805E bench meter and in a new post provides some teardown pictures.

The UT8805E utilizes a single board design, the layout is very clean. The power transformer is mounted on the ridged side panel which gives it the maximum structural strength.

The UT8805E has a cooling fan. It is used for the cooling of the onboard linear regulators. UNI-T could’ve used a larger diameter fan with lower rotation speed, which would make the operation much quieter.

The main FPGA used is a Trion T20F256C4. The main ADC used is an Analog Devices AD7172-2, a 24-bit sigma-delta ADC which is capable of up to 31.25 kSPS sampling rate. This fast sampling rate attributes to the fast display update rate of the meter. The voltage reference used is the MAX6225. Some of the Opamps used in this meter are AD8629‘s.

See the teardown video below and more in the post here.


Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat and our Discord!

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 38,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 11/15/2024 Featuring Adafruit bq25185 USB / DC / Solar Charger with 3.3V Buck Board! (Video)

Python for Microcontrollers – Adafruit Daily — Python on Microcontrollers Newsletter: A New Arduino MicroPython Package Manager, How-Tos and Much More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

EYE on NPI – Adafruit Daily — EYE on NPI Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

Adafruit IoT Monthly — The 2024 Recap Issue!

Maker Business – Adafruit Daily — Apple to build another chip at TSMC Arizona

Electronics – Adafruit Daily — SMT Tip – Stop moving around!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !


No Comments

No comments yet.

Sorry, the comment form is closed at this time.