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UNI-T UT89XE: 20000 manual ranging counts of pure fun - impressions & teardown
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Avelino Sampaio:
Raising the RMS voltage to 100mV, the frequency range increased to 110Khz(-3db). This is very similar to AD736's answers.

Note: The RMS converter used is ES5 from Cyrustek.
Avelino Sampaio:
As for the frequency meter, below is a table with minimum peak to peak voltage values, to obtain error-free readings.

up to 160khz -------------- 230mVpp
from 161 to 400khz ------ 250mVpp
from 401 to 700khz ------ 270mVpp
from 701 to 1.2Mhz ------ 290mVpp
from 1.2 to 2.7Mhz ------- 310mVpp
from 2.7 to 17.8MHz ---- 330mVpp
from 17.8 to 18.2Mhz --- 350mVpp
from 18.2 to 18.6Mhz --- 370mVpp
from 18.6 to 19Mhz ----- 390mVpp
from 19 to 19.3Mhz ------ 410mVpp
...
at 24Mhz (maximum generator) --- 780mVpp

Note in the image the reading error with the value below 230mVpp
Gyro:

--- Quote from: Andrew_Debbie on July 01, 2021, 02:11:22 pm ---Slot in the PCB too.

--- End quote ---

I can't work out what a slot in that position is actually achieving, there's no issue with creepage there. ???
Avelino Sampaio:
Follow the link of the DMM-Chipset datasheet: ES289B. There is a good example circuit to study, see in the image.
Avelino Sampaio:
In the range of 2v (higher resolution) the RMS accuracy is very good, in the limits of the effective region of the meter (45~400Hz).

Image 1: generator set at 1v RMS, 45Hz, sine.
image 2: frequency set to 400Hz, with good RMS accuracy
image 3: at 9.3Khz drop to -3db.
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