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.
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