English name: DC Resistance Tester. DC Resistance Tester is referred to as DC Resistance Measuring Instrument, DC Resistance Instrument, DC Resistance Tester for transformers, DC Resistance Tester, DC Digital Bridge and so on. DC Resistance Tester
Overview: DC resistance testing is an essential test item for transformers after handover, overhaul and change of tap changer. Under normal circumstances, measuring the DC resistance of transformer windings as well as high-power inductive devices by traditional methods (bridge method and voltage drop method) is a time-consuming and labor-intensive task. In order to change this situation, shorten the measurement time and reduce the workload of testers and developed DC resistance fast tester. Taking high-speed microcontroller as the core, adopting high-speed A/D converter and program-controlled current source technology, the tester achieves unprecedented measurement effect and highly automated measurement function, featuring high precision, wide measurement range, stable data, good repeatability, strong anti-interference ability and perfect protection function. Charging and discharging speed is fast and so on. The instrument. Small size, light weight, easy to carry. It is characterized by rapid measurement, easy to use and high measurement accuracy. Self-checking and automatic calibration function reduces the difficulty of using and maintaining the instrument, which is the ideal equipment for measuring DC resistance of transformer winding and high-power inductive equipment. This product conforms to the requirements of national standards GB6587-86 "General outline of environmental test for electronic measuring instruments" and GB6593-86 "Rules for quality verification of electronic instruments". Transformer DC resistance measurement is a mandatory test item for semi-finished products, finished products factory test, installation, handover test and preventive test of electric power department in the manufacture of transformer, which can effectively find out the manufacturing defects such as selection of materials, welding, loose connection parts, missing strands, broken wires, etc. of transformer coils and hidden dangers existing after operation. DC resistance tester is a new generation of transformer DC resistance test instrument, it can automatically select the test current according to different types of power transformers, and display the test results at the fastest speed. DC resistance tester and has a storage, printing, discharge instructions and other functions, built-in non-power-down memory, can be a long time to save the measurement data, the use of liquid crystal display makes the instrument man-machine interface is good, is the first choice of DC resistance testing equipment. DC resistance tester is a high-precision, wide-range, high-performance microprocessor control resistance tester. It can test the resistance of 1μΩ~3MΩ, and the maximum display is 30,000 numbers. The maximum test speed of 60 times / second, test speed in 15 times / second, can still ensure that the accuracy of 0.05%, and readings jump can be controlled in less than 3 words. Temperature compensation function comes standard for accurate testing of meter resistance. Three current modes are available to meet a variety of demanding resistance testing requirements. Transformer DC resistance tester is a new type of instrument designed to measure DC resistance of large-capacity transformer, which is designed as an integrated high-precision current stabilized power supply and test part of the composition, the test process of microcomputer control, automatic completion of the stabilization of the current judgment, data acquisition, data processing, resistance value display and printing. SX-2A transformer DC resistance tester (micro ohmmeter) is to replace the DC single, double-arm bridge high-precision products.SX-2A transformer DC resistance tester adopts advanced switching power supply technology, by four and a half LCD LCD display measurement results, three and a half LCD LCD display ambient temperature or test current value, to overcome the other similar products by the LED display value in the sunlight is inconvenient to read the shortcomings. Overcome the shortcomings of other similar products by the LED display value in the sunlight inconvenience reading, at the same time with automatic arc function.
Editorial Overview
DC Resistance Tester (0-40A) DC Resistance Tester Measurement of transformer winding DC resistance is a very important test project, in the "Power Equipment Testing Regulations", the order of the second in the transformer test project, "Regulations" in the transformer handover, overhaul, repair, change the location of taps, fault checking and pre-testing, etc., the DC Resistance Tester can be used to measure the DC resistance of transformer windings. The "Regulations" stipulates that in the transformer handover, overhaul, minor repairs, change of tap position, fault checking and pre-testing, etc., the DC resistance of the transformer winding must be measured, the purpose of which is to: ① check the welding quality of the wires and leads inside the winding ② check whether the contact of the tap changer is good in all positions ③ check whether there is any fracture of the winding or lead wires ④ check the correctness of the parallel branch circuit, and whether there is any breakage of one or more parts of the winding made of several parallel conductors ⑤ check the phenomena of layer and turn-to-turn short-circuiting. Phenomenon This product conforms to the requirements of national standards GB6587-86 "General outline of environmental test for electronic measuring instruments" and GB6593-86 "Rules for quality verification of electronic instruments". DC resistance tester product alias: DC resistance tester, transformer DC resistance tester, transformer winding DC resistance tester, transformer DC resistance tester, transformer DC resistance tester, transformer DC resistance tester, DC resistance tester, DC resistance of inductive loads DC resistance tester, DC resistance of inductive loads, DC resistance tester, DC resistance tester of inductive loads DC resistance tester Overview Transformer DC resistance test is the electric power equipment manufacturers and electric power generation, Power supply department in the transformer factory inspection, handover test, preventive test work must be measured items, can effectively improve product quality and prevent the occurrence of power accidents. Transformer DC resistance tester, by the high-power switching power supply circuit, precision small-signal measurement circuit, protection circuit, high-speed microcontroller control circuit, etc., with the instrument self-test, signal measurement, data processing, fast discharge, print the results and other functions.
Edit the main features of the instrument
1, the use of high-speed 16-bit A/D converter, stable measurement data, good repeatability. 2, automatic program-controlled current source technology, current source **** set up 1000 current stalls, automatically controlled by the internal micro-controller according to the measured resistance, so as to achieve a wider range of measurement and the best measurement state, without having to manually switch the current shift. 3, fast response time, in the measurement state can be directly converted to tap changer, the instrument will automatically prompt, the new resistance value will soon be displayed. 4, a high degree of intelligent design, clever and advanced function settings, can automatically determine the test line false connection, broken wire and other faults. 5, perfect protection function, can reliably protect the impact of reverse potential on the instrument, with automatic discharge indication function. 6、Measuring current and measuring time can be displayed. 7, intelligent power management technology, can effectively reduce the internal heating of the instrument. 8、It can store 120 times of measurement data, and will not be lost after power failure. 9, all Chinese character menu and operation prompts, intuitive and convenient.
10, digital resistance measuring instrument measurement accuracy, stable performance, clear display, wide measurement range, anti-interference ability.
Edit Structural Features and Operating Principle
This tester adopts the typical four-wire measurement method. In order to improve the accuracy of measuring resistance (especially low resistance). The programmable constant current source, programmable preamplifier and A/D converter form the main body of the measurement circuit. The central control unit applies a constant, high-precision current to the external load to be tested by controlling the constant-current source, and then, the acquired data (including test voltage, current test current, etc.) are processed to obtain the actual resistance value. The instrument can store 255 test data and print all the stored test data. The stored data will not be lost when the instrument is reset or powered down. Instrument specifications (HT-40A as an example) 1, the output current of four grades: 40A, 20A, 10A, 5A 2, Resolution: 0.1μΩ 3, Range: 20mΩ - 4Ω (5A); 10mΩ - 2Ω (10A); 0.2mΩ - 1Ω (20A); 0.1mΩ - 0.5Ω (40A); 4, Accuracy: 0.2% 5, Ambient temperature: 0 ~ 40 ℃ 6, ambient humidity: & lt; 90% RH 7, operating power: AC220V ± 10%, (50 ± 1) HZ 8, external dimensions: 400 × 200 × 350mm 9, weight: 13kg Test current 5A, 10A, 20A, 40A Measuring range 5A: 1μΩ ~ 4Ω 10A: 1μΩ ~ 2Ω 20A: 1μΩ ~ 1Ω 40A: 1μΩ ~ 4Ω Measuring range 5A: 1μΩ ~ 4Ω 10A: 1μΩ ~ 2Ω 20A: 1μΩ ~ 1Ω 40A: 1μΩ ~ 1Ω 40A: 1μΩ ~ 1Ω 1Ω 40A: 1μΩ~0.5Ω Measuring Accuracy ±0.2% (full scale) Display Mode 128×64 Dot Matrix Display Resistance Display is 4 1/2 digits Maximum Resolution 0.1μΩ Power Supply AC 220V±22V, 50Hz±2 Hz Fuse 5A Maximum Power Consumption 600W When the test current is 40A Operating Environment Ambient Temperature: 0°~40° Relative Humidity: ≤80%. Volume 400╳200╳425(mm) Weight 12kg with accessories Characteristics: ① Intelligent instrument controlled by microcomputer, test results can be stored; ② AC power supply, portable design, easy to use and carry; ③ Adoption of advanced constant-current power supply technology greatly reduces the volume, weight and power consumption of the instrument, which further shortens the measurement time and ensures the measurement data to be more stable and reliable. The instrument is suitable for measuring and analyzing the inductive and low resistance of all kinds of power transformers and transformer windings. Instrument Notes 1. Be sure to reset before measuring the inverted tap of the unloaded regulator transformer, and switch the tap changer after the end of the discharge, the end of the discharge beep and the disappearance of the prompt message. 2. 3. After the end of the test, press the "reset" button, be sure to wait for the discharge indicator off, prompting the disappearance of the message before turning off the power supply, remove the wire. 4. Please do not disconnect the power or test clamp during the test. 5. Please connect the ground wire before turning on the power, and remove the ground wire last after the test.
Edit paragraph instrument routine maintenance
1. Three months because the instrument itself can not meet the technical requirements, can be replaced unconditionally. 2. Free maintenance within one year, lifelong maintenance and technical services. 3. If there is a quality problem with the instrument, we will propose a maintenance program on the same day and go to the site to deal with the problem in time. Alternative instruments can also be provided to meet the user's use. 4. 4. Provide free on-site technical support and general knowledge training in the use of the instrument. 5. Please contact us in time to provide you with services when the instrument fails. Attachment 1: Panel printer paper change method The printer equipped with the instrument has been installed in the factory paper roll, when the paper roll in the printer is used up, you need to install a new paper roll, the specific installation process is as follows: (1) Remove the front cover of the printer. (2) Remove the entire printer from the instrument panel, gently remove the entire printer from the instrument panel by clamping the movable tongues on both sides of the printer inward with your fingers, and note that before removing the printer, be sure to confirm that the power to the printer has been turned off. (3) Remove the paper spool from the printer. (4)Slip the new paper roll onto the paper spool and fit the paper spool into the printer's guide slot without dropping out. (5) Cut the print paper head into a cone shape. (6) Turn on the printer's power, press the SEL key, so that the SEL indicator light off, and then press the LF key, so that the head of the rotation, this time by hand to feed the paper head into the head of the bottom of the paper inlet, the paper will be quickly into the head, until the head from the head is exposed to the front as a stop. The paper should be exposed for a certain length, and then press the SEL or LF key to stop feeding. Turn off the power, cover the front cover of the printer, and put the head of the paper through the exit of the front cover. (7) Attach the whole printer back to the instrument panel.
How to use the DC Resistance Tester:
A: DC power supply test: Close the main power switch, the corresponding indicator light, press the "start-stop" key, you can test. Test is complete, press the "reset button", the instrument shows "is discharging", such as the instrument returns to the interface of the power on, close the main power switch, the corresponding indicator light off, and then convert the test clip, to test again. B. AC power supply test: Connect the AC220V power supply, "charging" indicator light, close the main power switch, the corresponding indicator light, press the "start-stop" key, you can test. Test is completed, press the "reset button", the instrument displays "being discharged", and so the instrument returns to the interface of the power on, close the main power switch, the corresponding indicator light is off, and then convert the test clip, to test again. Note: After the test is completed, you must press the "reset button" and wait for the instrument to return to the power-on interface before you can turn off the power for the next test
Edit this section of the instrument panel specific operation methods
◇This machine **** set the "Selection", The machine is equipped with three buttons: "Select", "OK" and "Reset "***. 1, resistance measurement After powering on the instrument or pressing the reset button, the instrument enters the initial state (1). At this time, the cursor pointer to "resistance", directly press the "OK" key to enter the state (2), showing changes in charging current and measurement time, charging is completed automatically enter the state (3), showing the resistance value, measurement current and measurement time, at this time every time you press the "OK" key. At this time, every time you press the "OK" key, it will store a measurement result (the model with printer prints out the measurement result at the same time). Press the "Reset" key to exit the resistance measurement and enter the state (4), which displays the discharge current. After the end of the discharge, automatically return to the initial state (1), complete a resistance measurement. 2, the number of settings Input device number to help find the memory data, in the initial state (1), point the cursor pointer to the "Settings" and press "OK" key to enter the state (5), display the current device number. Then press the "OK" key to enter the state (6), prompted to enter the new device number, at this time, press the "Select" key can make the current input bit from '0' to ' 9', then from '0' to '9', then from '0' to '9', then from '0' to '9'. 9', and then from 'A' to 'Z' cyclic display, to find the desired number or letter after pressing the "OK" key that is, enter one, and then press the same Press "OK" key after finding the desired number or letter, that is, input one, then input the next one in the same way, after inputting six digits, go back to the state (5), and display the newly input device number. Press the "reset" key to return to the initial state (1). In the initial state (1), move the cursor to "memory" and press "OK" to enter the state (7), which shows the total number of records in the current memory, and then press "Select" to enter the state (8), which shows the total number of records in the current memory, and then press "Select" to enter the state (9), which shows the total number of records in the current memory. The MM value starts from 1 for each new device number entered and is totalized again. Pressing the "Select" and "OK" keys at the same time will clear all data in the memory, and pressing the "Reset" key will exit the intrinsic operation and return to state (1). The memory can store up to 120 measurements, the oldest record will be overwritten after exceeding 120 times. The memory contents can be kept for a long time without loss under power failure conditions.
Edit this paragraph DC resistance tester features:
1, attached to the rechargeable battery pack, field testing without AC power supply, easy to use. 2, the output charging current up to 2A, fast test speed. 3, resistance measurement range of 1μΩ-2KΩ, wide range. 4, the use of foreign imports of high-quality components, software design multiple anti-interference program, high accuracy and repeatability of measurement results. 5、Liquid crystal display mode, adapt to a variety of different working environments.
Edit paragraph DC resistance tester parameters:
1, the use of conditions: ambient temperature: 0 ℃ ~ 40 ℃ Relative humidity: ≤ 85% RH 2, the measurement range: 1mΩ ~ 20mΩ; 20 ~ 200mΩ; 0.2 ~ 2 Ω; 2 ~ 20 Ω; 20 ~ 200 Ω; 200 Ω ~ 2k Ω 3, the accuracy of the measurement: 0.2 level 4, resolution: 1μ Ω 5, constant current source: 2A (1uΩ ~ 2Ω); 0.2A (2Ω ~ 200Ω); 0.02A (20Ω ~ 2000Ω) 6, the operating voltage DC 11V ~ 14V AC 220V.[1] 7, power consumption: ≤ 15W 8, external dimensions: 335 × 275 × 175mm 9, weight: 2.8kg
Edit this section YZZ-10 DC Resistance Tester
I. Overview
This DC resistance tester adopts microcontroller control, large screen Chinese character LCD display, with printout function (and 232 interface). Eight gears of the instrument
are calibrated by the software, and the accuracy is up to one ten-thousandth. It can change gears automatically. The machine is small in size, light in weight, power saving, stable and reliable test data. Is to replace the DC single, double-arm bridge high-precision replacement products. It is the ideal instrument to measure the resistance of various inductive loads such as power transformer and low voltage switch contact resistance, wire and cable or weld interface resistance.
II. Working Principle
There is a DC constant current source in this instrument. During the measurement, the machine feeds a constant current to the test piece, which produces a corresponding voltage drop on the body under test, and this voltage value is taken back to the machine, which is amplified and sampled to calculate the resistance value. (R=U/I)
Three. Technical specifications
1, the use of conditions: ambient temperature: -15 ℃ ~ 40 ℃ relative temperature: ≤ 85% RH 2, the measurement range: 1K file: 1 --- 999.9Ω; 1Ω file: 0.1 --- 999.9mΩ 3, the measurement accuracy: 0.2% ± 5 words 4, resolution: 1μΩ 5, constant current source: 1A/5ma (2A/10ma) 6, can be AC (AC220V) work can also be DC work Power consumption: ≤ 15W (25W) 7, external dimensions: 330 × 300 × 160mm 8, Weight: 3.8kg 2KΩ
Edit ZGY-10D type inductive load DC resistance tester (10A)
Application range:
ZGY-10D Ltd.
ZGY-10D Type DC Resistance Tester for Inductive Load (10A) DC Resistance Tester for Transformer DC Resistance Tester DC Resistance Tester DC Resistance Tester for Inductive Load DC Resistance Tester Digital DC Resistance Tester Shanghai DC Resistance Tester DC Resistance Tester for Three-channel DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Instrument DC Resistance Tester DC Resistance Quick Tester DC Low Resistance Tester
Overview of ZGY-10D DC Resistance Tester for Inductive Load
The DC resistance tester for inductive loads is based on a high-speed micro-controller as the core, and adopts a high-speed A/D converter and a program-controlled current source technology, which achieves an unprecedented measurement effect and a highly automated measurement function with high precision, wide measurement range, stable data, good repeatability, strong anti-interference ability, and good protection function. High precision, wide measurement range, stable data, good repeatability, strong anti-interference ability, and perfect protection function. Charging and discharging speed is fast and so on. The instrument. Small size, light weight, easy to carry, is a new generation of transformer DC resistance test products. Second, ZGY-10D inductive load DC resistance tester main functions and features 1, the use of high-speed 16-bit A/D converter, measurement data stability, repeatability. 2, automatic program-controlled current source technology, current source **** set up 1000 current stalls, automatically controlled by the internal microcontroller according to the measured resistance, so as to achieve a wider measurement range and the best measurement state, without having to manually switch the current shift. 3, fast response time, in the measurement state can be directly converted to tap changer, the instrument will automatically prompt, the new resistance value will soon be displayed. 4, highly intelligent design, function setting clever advanced, can automatically determine the test line false connection, broken wire and other faults. 5, perfect protection function, can reliably protect the impact of reverse potential on the instrument, with automatic discharge indication function. 6、Measuring current and measuring time can be displayed. 7, intelligent power management technology, can effectively reduce the internal heating of the instrument. 8、It can store 120 times of measurement data, and will not be lost after power failure. 9, all Chinese menus and operation tips, intuitive and convenient. Third, ZGY-10D inductive load DC resistance tester main technical indicators 1, the main technical indicators are shown in the table below: Measuring range: 1mΩ-2KΩ Output current: 0-10A Measuring accuracy: 0.2% ± 2 words 2, the highest resolution: 1uΩ 3, the operating power supply: AC220V ± 10% 4, the ambient temperature: -10 ∽ 40 ° C. 5, Volume: 370 × 245 × 130mm (10A type). 130mm (10A type) 6, Manufacturer: Shanghai Shujia Electric Co. 7, Weight: 7Kg (10A type)
Edit ZGY-40 Inductive Load DC Resistance Tester (40A)
Application range:
ZGY-40-Shanghai Shujia Electric Co. >ZGY-40 DC Resistance Tester for Inductive Load(40A) Instruction Manual DC Resistance Tester for Transformer DC Resistance Tester DC Resistance Tester DC Resistance Tester for Inductive Load DC Resistance Tester Digital DC Resistance Tester Shanghai DC Resistance Tester Three-channel DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Instrument DC Resistance Rapid Tester DC Low Resistance Tester
I. Overview
The DC resistance tester, high-speed micro-controller as the core, the use of high-frequency modulation of high-power power supply, high-speed A/D converter and program-controlled current source technology, to achieve up to 100A high-current output, to achieve an unprecedented measurement effect and a high degree of automation of the measurement function, has a high degree of accuracy, wide measurement range, data stability, good repeatability, strong anti-interference ability, perfect protection function, fast charging and discharging speed and so on. Characteristics. The instrument is small in size, light in weight, easy to carry, and is the latest generation of transformer DC resistance testing products. DC resistance measurement of new ideas!
The main functions and features:
1. Adopting high-speed 16-bit A/D converter, stable measurement data, good repeatability. 2. 2. Automatic programmable current source technology, both manually select the typical value of the output current can also be automatically controlled by the internal micro-controller output current, the current source internal *** set 2000 current stalls, in the automatic state, by the internal micro-controller according to the measured resistance automatically control, so as to achieve a relatively wide range of measurements and the best measurement state. 3. real-time dynamic display, fast response speed, can be directly converted in the measurement state of the tap changer, the instrument will be automatically prompted, the new resistance value will soon be displayed, no need to restart. 4. highly intelligent design, clever and advanced function settings, can automatically determine the test line false connection, broken line and other faults. 5. perfect protection function, can reliably protect the impact of reverse potential on the instrument, with automatic discharge indication function. 6. Measuring current and measuring time can be displayed. 7. intelligent power management technology, can effectively reduce the instrument internal heating. 8. 250 times of measurement data can be stored, power-down is not lost. 9. all Chinese menus and operation prompts, intuitive and convenient. 10. 10. Built-in micro-printer, can print the measurement results and memory records. 11. No power down calendar, clock function.
Three, the main technical indicators:
1. The main technical indicators are shown in the following table: Model Measuring range Output current Measuring accuracy Volume ( mm ) Weight kg
20A 500mW~50W 0~20A 0.2%±2 words 380×250×130 7.5
30A 500mW~40W 0~30A 0.2%±2 words 380×250×130 7.5
40A 200mW~25W 0~40A 0.2%±2 words 380×250×140 8
50A 200mW~20W 0~50A 0.2%±2 words 380×250×140 8
100A 100mW~10W 0~ 100A 0.2%±2 words 400×270×160 9
2. the highest resolution: 0.1mW 3. power supply: AC220V±10% 4. ambient temperature: -10 ~ 40 ° C 5. manufacturer: Shanghai Shujia Electric Co. Application:
ZGY-3 DC Resistance Tester(3A) DC Resistance Tester for Transformer DC Resistance Tester DC Resistance Tester for Inductive Load DC Resistance Tester Digital DC Resistance Tester Shanghai DC Resistance Tester Three-channel DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Tester DC Resistance Quick Tester DC Low Resistance Tester
One, ZGY-3 DC Resistance Tester Overview
This is a DC resistance tester for inductive loads. Resistance Tester Overview
ZGY-3 DC resistance tester, high-speed micro-controller as the core, built-in rechargeable battery and charging circuit, using high-speed A/D converter and multi-range programmable current source technology, to achieve a wide range of resistance measurements, to achieve an unprecedented measurement effect and a high degree of automation measurement function, with high precision, wide measurement range, data stability, good repeatability, strong anti-interference ability, protection function. High precision, wide measurement range, stable data, good repeatability, strong anti-interference ability, perfect protection function, fast charging and discharging speed and so on. Especially suitable for the field without power conditions and transformers and other large resistance winding measurement. The instrument is small in size, light in weight, easy to carry, and is the latest product of transformer DC resistance test. ZGY-3 DC resistance tester main functions and features: 1. ZGY-3 DC resistance tester adopts high-speed 16-bit A/D converter, stable measurement data and good repeatability. 2. 2.ZGY-3 DC resistance tester has built-in rechargeable battery and fast charging circuit, with charging indication and over-charging protection function. 3.ZGY-3 DC resistance tester automatic program-controlled current source technology, both manually select the typical value of the output current can also be automatically controlled by the internal micro-controller output current, the current source internal *** set 3000 current gears, in the automatic state, by the internal micro-controller according to the resistance under test automatic control, so as to achieve a wider range of measurements and optimal measurement state. 4.ZGY-3 DC resistance tester real-time dynamic display, fast response speed, can be directly converted in the measurement state of the tap changer, the instrument will be automatically prompted, the new resistance value will soon be displayed, no need to restart. 5.ZGY-3 DC resistance tester is highly intelligent design, function setting clever and advanced, can automatically determine the test line false connection, broken line and other faults. 6.ZGY-3 DC resistance tester has perfect protection function, which can reliably protect the impact of reverse potential on the instrument, and has automatic discharge indication function. 7.ZGY-3 DC resistance tester can display the measurement current and measurement time. 8.ZGY-3 DC resistance tester can store 250 times measurement data, no loss of power. 9.ZGY-3 DC resistance tester all Chinese menus and operation tips, intuitive and convenient. 10.Manufacturer: Shanghai Shujia Electric Co.
Three, ZGY-3 DC resistance tester main technical indicators:
1. The main technical indicators are shown in the following table: Model Measuring range Output current Measuring accuracy Volume (mm) Weight
1 1mW~20kW 0~1A 0.2%±2 words 280×210×110 4kg
2 Type 1mW~10kW 0~3A 0.2%±2 words 280×210×110 4 kg
3 Type 1mW~5kW 0~5A 0.2%±2 words 280×210×110 4 kg
2. Maximum resolution: 1mW 3. Operating power: AC220V±10%, or built-in batteries 4. Time: 3A type about 2 hours of continuous work 5. Ambient temperature: -10 ~ 40 ° C
Fourth, ZGY-3 DC resistance tester key settings
ZGY-3 DC resistance tester tester * * * * set six keys, it is described as follows: 1. Cursor movement keys "▲", "▼", "?" In the menu selection state, used to move the cursor to select the desired menu item, in the parameter setting state, used to make the current input bit plus 1, minus 1, right shift. 2. "Cancel" key: In the state of menu selection and measurement, it is used to cancel the current operation and go back to the superior menu. Under the parameter input state, it is used to cancel the current input bit until it exits the input state. 3. "OK" key: Used to confirm the current selection or confirm the current input data. 4. "Reset" key: In any state, press this key will make the machine reset back to the initial state.