The switch of the digital multimeter is broken and there is no switch to replace. How to short-circuit it?
The 6-pin switch is mostly used in digital multimeters with automatic shutdown function. Typical models include DT9205A, DT9208A, 890D, 890C+ and other models. When the power is turned off, the power supply charges the capacitor; when the power is turned on, the capacitor discharges to the ground. When the flip limit is reached, the Will shut down;
This kind of circuit has high requirements for electronic switches. In normal use, if it is used continuously, the capacitor will be turned off and on again every 15 minutes or so, which will cause rapid loss of the switch, so the switch will often fail. For problems with use, generally you only need to replace the switch. If there is no switch to replace, you can short-circuit the pins of the switch or remove the automatic shutdown function of the multimeter.
The specific method is: just short-circuit the top 4 pins of the switch.
Digital multimeter failure: Just press the switch with your hand and the display will stop. Who has encountered this phenomenon? What is going on? The multimeter does not display, but the short-circuit switch displays it. That’s it for now!
When the digital multimeter’s buzzer level is short-circuited, why does it display 2 instead of 0?
The contact of the test lead jack is poor, or the quality of the test lead wire is poor. Directly short-circuit the red and black test lead holes with copper wire to see if it reaches 0. It may also be that the contacts of the transfer switch disk are dirty. Clean the contacts of the turntable. , if it still doesn’t work after cleaning, it is a circuit problem with the meter. There is an adjustable potentiometer that can reset the 0 position.
Why does the multimeter display 0 after the millivolt range is short-circuited?
If not short-circuited, a very small voltage will appear due to induction or leakage current in the meter, which will be displayed in the mV range. In a relatively large range, because the voltage dividing resistor and the voltage value are relatively small, they will not be displayed.
