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Help Fixing UT61E MultiMeter continuously beeping

pharaon

Oct 28, 2014
415
Joined
Oct 28, 2014
Messages
415
ok done got you the voltage , it was mess to find the right pin each time
17- 0.02V
18- 0.0V
19- 2.97V
20- 3.01V
21- 3.01V
22- 3.01V
23- 3.01V
24- 3.00V
25- 2.98V
26- 2.71V
27- 0.00V
28- 0.00V
29- 0.00V

37- 1.21V
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
12,882
Joined
Nov 17, 2011
Messages
12,882
For example pins 23 ... 26 are inputs for voltage measurement. Without voltage connected to the meter's input terminals I'd expect 0 V at these pins. According to the datasheet chapter 1.2 a full scale voltage of 22 mV is to be expected when the input voltage is at the maximum for ach range. With 3 V at these pins it is obvious why the meter displays overload.
In the schematic I see no way these voltages can be present other than a defect of the chip U1. I'm afraid the chip has been toasted by your initial wrong connection.
 
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