1 ZZC10CDC resistance testerOverview

The DC resistance of transformers is a necessary measurement item for semi-finished and finished products in transformer manufacturing, factory testing, installation, major repairs, changes to tap changers, handover testing, and preventive testing by power departments. It is possible to check the welding quality of the winding joints and whether there is a turn to turn short circuit in the winding. It can also detect whether the various positions of the voltage tap changer are in good contact, whether the actual position of the tap changer matches the indicated position, whether the lead wire is broken, and whether there are broken wires when multiple wires are wound together. This instrument adopts a new power technology, which has the characteristics of small size, light weight, large output current, good repeatability, strong anti-interference ability, and protective function. The whole machine is composed of32bitARMSingle chip microcontroller control, high degree of automation, with automatic discharge and discharge alarm functions. The instrument has high testing accuracy, easy operation, and can achieve rapid measurement of transformer direct resistance.

二、 ZZC10CDC resistance testersafety measures

1Before using this instrument, be sure to carefully read this manual.

2This instrument can be used both indoors and outdoors, but should be avoided from places such as rain, corrosive gases, etc.

3Avoid severe vibrations.

4The maintenance, care, and adjustment of instruments should be carried out by professionals.

5After the test is completed, be sure to press the touch screen first停止Key or buttonreturnkey,After the discharge alarm sound ends, the power can be turned off and the test line can be removed.

6During the testing process, it is prohibited to move the test clip or turn off the power supply line.

III ZZC10CDC resistance testerFeatures

1、The whole machine is composed of32bitARMSingle chip microcontroller control, high degree of automation, easy operation.

2Adopting new power technology, with multiple current levels and a wide measurement range, the test current can be automatically selected according to the load.

3. A 24 bit true color LCD touch screen with an 800 * 480 dot matrix, displaying clearly under strong light, and can be used for both touch screen and buttons.

4. RS232 and USB interfaces, capable of communicating with computers and storing on USB drives.

5Protection function *, can reliably protect against the impact of back electromotive force on the instrument, and has more reliable performance.

6Equipped with discharge sound alarm and screen prompt, clear discharge indication, reducing misoperation

7Fast response speed, stable measurement data, and automatic data refreshing during the testing process.

8Intelligent power management technology effectively reduces internal heating of instruments and saves energy.

9Non power clock and non power storage, canEternal - LongSave data.

10. Full voice broadcast, with male and female voices available for selection（Note: The voice module is an optional item）

11Switch between Chinese and English.

4 ZZC10CDC resistance testertechnical indicators

1Output current<5mAThe40mAThe200mAThe1AThe5AThe10A, Automatic

2、Resolution:0.1. Mu.. Omega..

3. Range: 10 Ω -50K Ω (<5mA range)

500mΩ-500Ω （40mA 档）

100mΩ-100Ω (200mA 档)

5mΩ-20Ω (1A 档)

1mΩ-4Ω (5A 档)

0.5mΩ-2Ω (10A 档)

0.5m Ω -50K Ω (automatic transmission)

4. Accuracy:<0.2% ±2a character

5. Working temperature: -10~40 ℃

6. Working humidity:<80% RH, no condensation

五、 ZZC10CDC resistance testerSystem Introduction

The panel of the instrument is shown in the following figure

3. Terminal post:

I+、I- ： I+To output a positive current, I-Negative output current.

V+、V- ： V+For the positive terminal of the voltage line, V-The negative terminal of the voltage line.

4. Printer: Micro printer, capable of printing and outputting test data.

5. LCD touch screen:Display interactive information and allow touch operation.

6Communication interface:RS232Interface, andUDisk interface, used for data transmission.

7. Button: can perform key control operations on the instrument

六、 ZZC10CDC resistance testerTesting and operation methods

The instrument wiring is shown in the following figure: connect the thick red test wire toI+Up, the fine thread connectsV+Up, clamp the test clamp onto one end of the sample and connect the thick black test wire to itI-Up, the fine thread connectsV-Connect the test clamp to the other end of the test sample.

After booting up, the screen will display the instrument initialization status, as shown below:

Later, enter the main page as shown below:

On the main page, press the 【 ← 】 and 【 → 】 keys（Hereinafter referred to as directional keys）The highlighted cursor will move between the four icons of "Resistance Test", "Parameter Settings", "Data Query", and "System Settings", indicating that the corresponding function has been selected. Press the OK button to enter the corresponding function page (or click the icon directly to enter).

1Resistance testing

Press the directional keys to select the "Resistance Test" icon, then press the keyboard OK key to enter the test parameter confirmation page for resistance testing (or click the icon to enter directly, the following entry method is the same and will not be repeated),