DC resistance tester details
I. Overview
The DC resistance measurement of the winding is one of the routine tests of the transformer. Its purpose is mainly to check the connection between the windings, between the windings and the leads, or whether the mechanical characteristics are good and whether the resistance between the windings of each phase is balanced, etc., to ensure the transformer Safe operation.
The company developed and produced a series of transformer DC resistance tester using 32-bit ARM core as the core of the processing, control the whole machine, auto-complete self-calibration, steady flow judgment, data processing, resistance display and other functions, can measure various types Transformer and transformer DC resistance. The instrument can work directly with the internal battery, which greatly facilitates the use of field workers.
Second, security measures
Be sure to read this manual carefully before using this instrument.
The operator of the instrument should have general knowledge of the use of general electrical equipment or instruments.
This instrument can be used indoors or outdoors, but it should be avoided in places such as rain, corrosive gas, excessive dust, high temperature, and direct sunlight.
The instrument should avoid severe vibration.
Maintenance, care, and adjustment of the instrument should be performed by professionals.
After the test is complete, turn off the power and remove the test line.
To measure a no-load regulator transformer, be sure to switch gears after the discharge indicator stops.
During the test, it is forbidden to move the test clip and the power supply line.
Third, performance characteristics and technical indicators
Output current and range: Output current: 0-3A, range: 1mW-50KW.
Current range current range
3A1mW-2W0.1A10W-60W
1A50mW-6W20mA50W-300W
0.5A5W-12W5mA200W-1.2KW
Note: Please use the automatic test function beyond the above range.
Test accuracy: 0.2% The highest resolution: 0.1mW.
The instrument adopts 65K true color LCD display, Chinese menu prompts, easy to operate.
With large capacity storage, it can store 2000 test records,
Operating power: AC220V±10, or internal battery.
Operating temperature: 10 °C ~ 40 °C.
Operating Humidity: The ambient humidity is <80%RH.
Instrument weight: 3.
Fourth, the system introduced
AC220 power socket with switch and fuse compartment
Ground post: Ground terminal
I+ I-: Output Current Terminal
V+ V-: sampling voltage terminal
"", "", "3", "4" select keys, "3" reuse "save" function.
Confirmation button: Confirm the current selection. In the test state, press the confirmation button to print the data.
Cancel button: Press this button to return the menu to the previous level.
Reset key: After the test is completed or the work is interrupted, press this key to return to the initial state.
“Charge†the internal battery charge indicator of the instrument. When the AC220 is plugged in, the “charge†light is on, indicating that the instrument battery is charged. The boot main menu and the current selection menu display the battery level "Bat: 98%" as shown in FIG. 2 and FIG. When the power is below 40%, the number turns red, prompting for charging.
Remove the specially equipped special test line, where the red and black test clamps are respectively clamped to the two sampling ends of the tested product, and the frictional contact point is strongly rubbed. The other end of the test line is connected to the instrument's connection terminal. (Note that the red and black colors correspond, and the thick wire connects the current terminal, and the thin wire connects the voltage terminal)
Boot, the screen shown in Figure 1
The instrument enters the main menu after self-test, as shown in Figure 2
figure 2
Press "", "", "5" and "4" keys to cycle through the output currents. When measuring the same voltage transformer windings of the same voltage level, the same current should be selected for testing to avoid test errors. After selecting the output current, press “OK†to enter the test state, as shown in the figure below; after the value is stable, press “3†to save and press “OK†to print the current data.
image 3
Instrument test results shown in Figure 4
Note: Inductive loads must be tested before discharging the test line or testing
Figure 4
After the measurement is finished, press "Cancel" to return to the previous menu. After the instrument is discharged, as shown in Figure 4, the menu of Figure 3 is returned.
Figure 4
Parameter settings: Select this menu, as shown in Figure 5:
1. Winding material: After selecting this item, press "","" to select winding material: copper-aluminum.
2. Winding temperature: refers to the current temperature of the winding. After selecting this item, press "", "" to input the winding temperature.
3. Convert temperature: select this item, the instrument will automatically convert the test data to this input temperature
4. Brightness adjustment: After selecting this item, press ""," to adjust the screen brightness to meet the display requirements in various environments.
Browsing history: Select this menu, as shown in Figure 6:
Figure 6
Press "","" to browse the record, press "OK" to print the current data. "003" indicates the total number of data storage, "001" indicates that the current data is the latest data. The time below indicates the test date and time at that time.
Adjust the clock: Select this menu, as shown in Figure 7:
Press “3†and “4†to move the cursor and select the desired item. Press “ â€, “ †to adjust the current date and time. If you need to save after the modification is completed, press "OK" to exit without saving. Press "Cancel" to exit.
Figure 7
Six, matters needing attention
The ground terminal of the instrument must be well grounded before use.
If you experience a sudden power failure during the test, do not remove the test lead immediately. Do not dismantle the instrument until it has discharged.
For on-load tap-changer testing, one power supply can be completed. The instrument program design allows the tap changer to fall to the next tap after a certain tap test, and the instrument will enter the next tap measurement.
For a no-load regulator transformer, after a certain tap test is completed, the system must be discharged by pressing the cancel or reset key. After the discharge is completed, the switch can be switched to perform the next measurement.
The internal battery of the instrument must be charged and discharged once every three months. To extend battery life
When the test is not working due to a lack of battery, immediately turn off the power and charge it.
Seven, common problems and solutions
The following table
Analysis of common faults
Boot no display power outlet fuse damage
Looseness of the internal plug of the instrument
3) Computer board failure
"Overrange or line is not connected" 1) Instrument power failure 2) A/D board failure
3) The test wire is in poor contact or has not formed a loop
Eight, packing list
Straight resistance meter host platform
Special test cable sets
Three-core power cord
Fuse bar
Only
Operation Manual
Nine, after-sale service
Within 12 months from the date of purchase, the instrument is free of charge for repair and replacement of product quality problems, and provides warranty and technical service for life. If the instrument is found to be abnormal or faulty, please contact the company in time to arrange the most convenient solution for you. 
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