Functional experience of multifunctional handheld digital multimeter before disassembly

数码小叶

Functional experience of multifunctional handheld digital multimeter before disassembly [Copy link]

 

 

I noticed this type of multimeter a long time ago. It is small and thin. There are many multimeters sold online. Most of them are similar. They don’t have traditional knobs. They are completely automatic. Not only the range is automatic, but also the functions are automated. Whether measuring voltage or resistance... You don’t have to intervene. For example, the following different brands

However, some larger multimeter manufacturers have not launched similar products, so I am still worried about the disadvantages of this and have never purchased one.

This time we disassembled the Chint ZTW0111A, which seems to be a bit smaller . The one posted on the disassembly post is the ZTW0111C. Here is a comparison of the three ABCs:

In terms of intuitive functions, 0111A has removed the commonly used diode function. In fact, the essence has changed. Compared with B and C, 0111A has one less manual function selection. This is very strange. The more expensive ones retain the manual function selection? ! It was not until I tried it myself that I understood the reason.

The outer packaging is the same as that of a common multimeter

There is a watch bag inside, which is more convenient for storage.

There are four buttons on the front: switch, backlight/hold, rear LED lighting, and NCV/LIVE. Compared with B and C, there is one less function switch button. Below the buttons are the supported measurement functions.

There is a bright LED and NVC non-contact voltage measurement mark on the back.

1, 2, 3 show the three levels of induction voltage: low, medium and high

Compared with ordinary multimeters, it has an additional LIVE neutral and live wire test, so you don’t need a tester.

FireWire:

Neutral line:

Let's take a look at its conventional function measurements, compare the Uni-T and Fluke multimeters, and measure together

First is the DC voltage measurement:

1. Lithium battery voltage measurement

2. No. 7 battery voltage measurement

10K resistor measurement:

470 Ohm Resistor:

220V AC voltage measurement:

As for the numerical values, I will not comment on them for now. During the measurement process, the disadvantages of the fully automatic multimeter appeared. First, the speed was significantly slower than the other two multimeters. Secondly, when measuring DC voltage, there was a jump phenomenon, such as the voltage and resistance jumping to each other. Although the voltage will eventually stabilize, this disadvantage is difficult to control when measuring a complete board.

When the three meters measure components on the circuit board, the results are quite different. In addition, when the power is on, ZT0111A will jump. Sometimes the measurement result is resistance, and sometimes the measurement result is voltage.

The formal disassembly will begin later

annysky2012

Very good disassembly, looking forward to your follow-up disassembly to see what this looks like

dcexpert

Fully automatic meters are particularly difficult to use for small signals and are prone to mis-shifting.

littleshrimp

Automatic gear, give him a thermocouple, what result will he measure?

tagetage

It is not possible to measure the circuit board while it is powered.

w494143467

I feel the resistance measurement accuracy is a bit poor.

数码小叶

dcexpert posted on 2021-10-10 21:24 Fully automatic meters are particularly difficult to use for small signals and are prone to mismatch

Indeed, after using it, I realized that the range is not 0.

数码小叶

littleshrimp posted on 2021-10-11 00:47 If you give this automatic transmission a thermocouple, what results will it measure?

I don't have a thermocouple yet...

littleshrimp

Digital Leaf published on 2021-10-11 12:49 I don’t have a thermocouple yet. . .

There is no better, don't make it difficult for it

数码小叶

tagetage posted on 2021-10-11 10:03 It is not possible to measure a circuit board while it is powered.

Resistance is not allowed, but voltage is allowed, but it will also jump . This is done in the comparison test above.

数码小叶

w494143467 posted on 2021-10-11 11:56 I feel that the accuracy of measuring resistance is a bit poor.

More than just resistance

w494143467

Digital Leaf published on 2021-10-11 17:08 More than just resistance

Looking forward to taking it apart and seeing the circuit inside!