What is the function of the buzzer used for?
Answer: The buzzer function is an additional function of a multimeter, usually set at 2K Ω. It is usually used when measuring a circuit (or resistance) with a resistance value below 50 Ω, and the built-in buzzer will sound. This function plays a significant role in practical applications and can improve the efficiency of measuring circuit continuity. It is an essential function for electronic maintenance.
Why does a digital multimeter fail to return to zero when short circuited in the 200 Ω range?
In the 200 Ω range, due to the presence of resistance values in the circuit, instrument internal resistance, and contact points, some tails are normal during short circuiting. This tail will become larger and cannot be adjusted during use, but the value can be reduced by wiping the circuit board and close contact points. You can short-circuit it during use, record the value, and subtract it from the measurement.
How to determine if a multimeter is good?
This is a relatively large issue, and trying out each functional range is a good method. When testing, it is necessary to first find the detection source, but it is generally impossible for users to bring their own standard detection source, so qualitative and quantitative methods can be used for general testing. The basic solution is to find the detection source and follow the instructions to use it once.
How to proofread a multimeter?
A multimeter, like other measuring instruments, is calibrated by the manufacturer when leaving the factory. Therefore, if there are no significant issues, please do not adjust it arbitrarily. Nowadays, the head of a multimeter is usually a voltmeter, so when checking other gears, it is necessary to first adjust the DC voltage gear. This gear is called the basic gear by industry insiders. If this gear is inaccurate, almost every gear and function (except for the resistance gear) may be inaccurate. Generally, a multimeter will set a potentiometer (such as DC voltage range) or multiple potentiometers (such as temperature range) for each function, and there are also those without potentiometers (such as resistance range). It's easy to handle those with potentiometers. Just input the detection signal and adjust it directly; Without a potentiometer, it is generally not inaccurate. In case of misalignment, it may be caused by damage to the instrument or poor circuit contact.
How to determine (detect) whether the DC voltage range (DCV) of a multimeter is good?
When testing, it is necessary to first find the detection source. As we conduct qualitative and quantitative measurements, there are many available detection sources. For household use, there are 1.5V alkaline/carbon batteries (No. 1, No. 5/AA, No. 7/AA), 1.2V charging pools, mobile phone chargers, power adapters, and so on. When testing, set the multimeter to the desired DC voltage range, insert the probe according to the instructions, connect the detection source, and read the reading on the LCD. As long as the measured value is around the nominal voltage, it is sufficient.
