Precaution for Use（LYZT5500  Insulation Resistance Meter）

Thank you for purchasing High Voltage Insulation Resistance Tester. Before using the tester for the first time, to avoid possible electric shock or personal injury, please be sure:

--- Read carefully and strictly follow the safety regulations and precautions listed in this manual.

--- In any case, you should pay special attention to safety when using this instrument:

·Before the test, please make sure that the tested object is in off state or the power has been disconnected. This instrument cannot be used for testing live equipment and devices.

·Before the test, please make sure that the withstand voltage of the tested object must be above the output voltage gear, and do not use the insulation resistance tester as a withstand voltage tester.

·Before the test, please make sure that the instrument and accessories are in good condition, the instrument shell and the insulation layer of the test wire are not damaged, exposed or broken.

·During the test, do not switch gears, and it is strictly forbidden to touch the exposed conductor and the measuring circuit.

·After the test, do not discharge in an external short circuit, the tester has the function of automatic rapid discharge. After finishing the automatic discharge, the screen shows the output voltage lower than 36V, then the test line can be removed, to ensure that the equipment and components are fully discharged.

·The instrument outputs high voltage, please be sure to connect the test line first, and confirm that the connecting plug of the test line has been tightly inserted into the instrument interface port. Press the test button to test after the hand leaving the test line, otherwise there is a risk of electric shock.

·Do not use the instrument when the hands and the instrument surface are wet.

·It is strictly forbidden to use the tester in the environment of explosive gas, steam or dust.

·Do not place and store the meter in high temperature&humidity or dewy places and under direct sunlight for a long time.

·Use, disassembly, calibration, and repair of this tester must be performed by authorized personnel.

·The instrument and the manual with the safety danger mark , users must strictly follow the instructions in this manual to operate safely.

1.Introduction（LYZT5500  Insulation Resistance Meter）

LYZT5500 Series High Voltage Insulation Resistance Tester is a high performance high voltage insulation resistance tester well researched and developed by our company. The tester has complete and various insulation resistance index test functions, self-set test voltage function, and good anti-interference ability. It has obvious advantage in substation and other environments with strong induction and large distributed capacitance. The instrument is equipped with a true-color touch screen, and all test data and battery power are displayed on the same screen which is clear and obvious. The combination of the rotary switch and the button makes the operation very simple. The user does not need to memorize the operation method, and the operation method will pop up by clicking the "HELP" button on the screen, effectively guiding the user to operate the instrument. The tester is suitable for insulation resistance testing of large-scale equipment such as electrical equipment and transmission lines in large-capacity, high-voltage, and strong-inductive environments. It is a commonly used and indispensable instrument in the departments of electric power, telecommunications, meteorology, computer rooms, oil fields, electromechanical installation and maintenance, and power supply departments of industrial and mining enterprises.

The test timer of the instrument automatically records the test time and stores the test results with date and time. The touch screen can easily check the recorded historical data. The completely isolated USB interface and Bluetooth communication can safely upload the test data to the PC or mobile phone for users to analyze data. The instrument provides the test lines of double-layer insulation and shielding layer, and the high-voltage rod is equipped with replaceable alligator clips and hooks, which can be adapted to various test sites. The instrument adopts a solid double-layer shell structure, and the protection level of the case is IP65, which can prevent the intrusion of moisture and dust during transportation and storage, and prevent impact and effectively protect the instrument.

2.Product Feature（LYZT5500  Insulation Resistance Meter）

2.1 5-inch touch colorful screen, the test data is displayed on the same screen. It is very convenient to do the test operation and view history data.

2.2 Insulation resistance range: 0.005MΩ~10.0TΩ.

2.3 Output rated voltage reaches up to 7 gears (50V, 250V, 500V, 1kV, 2.5kV, 5kV, 10kV).

2.4 Max short circuit current is 5mA.

2.5 Large output power, strong anti-interference ability, and stable test capability in large distributed capacitance sites (such as long cables) and strong electromagnetic interference environments (such as substations).

2.6 Perfect measurement feature: Insulation resistance test (IR), polarization index test (PI), dielectric absorption ratio test (DAR), Step test (STEP), Ramp test (RAMP), Voltage (V).

2.7 Custom setting measurement mode: PI, DAR calculation formula can be selected to provide users with multiple choices.

2.8 Custom setting voltage mode: the test voltage and test duration can be set freely, which is convenient for special scenarios.

2.9 Voltage monitor: Automatically monitor the live voltage of the measured object. Voltage exceeding 36V will automatically prohibit the test to effectively protect the instrument and the operator.

2.10 Current monitor: Automatically displays the current of test circuit.

2.11 Temperature monitor: Automatically displays the temperature and humidity inside the tester.

2.12 Automatic discharge function, automatically and quickly releases the electric charge of the tested object after the test, with no need for an external discharge circuit.

2.13 Large capacity rechargeable lithium battery pack 14.8V 5200mAh, to ensure long-term testing work.

2.14 Large-capacity test record memory, test records can be browsed and analyzed directly in the tester, it can automatically store the real-time test data with test date and test timing, total of 1000 groups.

2.15 USB communication and upload function, the record data can be uploaded to computer for storage and analysis.

Bluetooth communication function, which can upload the test result to mobile phone.

Double shell structure, which is durable and the protection level reaches IP65 (when closed).

2.17 Double shell structure, which is durable and the protection level reaches IP65 (when closed).

3. Model Category（LYZT5500  Insulation Resistance Meter）

4. Insulation Resistance Range & Accuracy（LYZT5500  Insulation Resistance Meter）

5. Technical Specification（LYZT5500  Insulation Resistance Meter）

6. Tester Structure

7. Safety Tips

To avoid electric shock or personal injury, follow these guidelines:

7.1 Do not work alone or in explosive gas, steam or high dust environment.

7.2 Before testing, make sure that the tester voltage display is not higher than 36V.

7.3 Confirm that the tested device is in a power-off state. This instrument is not allowed to be used to test live devices.

7.4 Confirm that the withstand voltage of the tested device is within the output voltage range of the selected test gear.

7.5 After the test, do not take away the test line when the voltage is higher than 36V to ensure that the distributed capacitor electric charge is completely discharged.

7.6 Check whether the insulation of the test line is damaged, if damaged, please replace the cable.

7.7 Insert the test line into the correct port, otherwise high voltage may be output to dangerous parts.

7.8 During the test, do not touch the test line clip and the connected part of the tested device. Touching may cause electric shock accident.

7.9 When removing the test line after the test, please hold the finger protector back end of the test line clip.

8. Measurement Method

8.1. Measurement Steps

1）Non-destructive inspection of the instrument, and confirm the tester and test line are not damaged.

2）Check the battery voltage, check the battery power indicator after starting up the tester, if the power is too low, please charge first.

3）Check the storage space for test records, and check the used rate of the storage space in the lower right corner after starting up the tester. If the remaining space is small, it should be cleared in time.

4）Correct wiring connection, insert the test cable into the corresponding jack, and connect the tested device.

5）Check whether the test device is live or not, and it is strictly forbidden to test when the device is live.

6）Confirm the test voltage gear to prevent the tested device from being damaged under the selected voltage gear.

7）Set the measurement mode, can choose the calculation formula when measuring DAR and PI parameters.

8）Test and record the measurement results.

9）After the test, the instrument should be cleaned of dirt and properly stored in a ventilated and dry place.

8.2. Button & Rotary Knob Function

RAMP and STEP modes can only be selected in preset gear, and these two modes are not allowed to be selected in V gear and VS gear.

When selecting the dielectric absorption ratio (DAR) or polarization index (PI), there is a test duration requirement, and the test will be automatically stopped after the corresponding test result is collected; if the test is stopped by pressing the test button in advance during testing, the corresponding test option will be discarded and no test result will be obtained.

8.3. Test Interface

1）Normal measurement mode interface

2）Custom setting output voltage measurement mode interface

3）Step (STEP) measurement mode interface

4）Ramp (RAMP) measurement mode interface

The principle of insulation resistance measurement is that a voltage V is generated by the high voltage generator and applied to both ends of the tested resistance. By measuring the current I flowing through the resistance, the resistance value R is calculated according to ohm's law.

R=V/I

8.4. Insulation Resistance (IR) Measurement

The principle of insulation resistance measurement is that a voltage V is generated by the high voltage generator and applied to both ends of the tested resistance. By measuring the current I flowing through the resistance, the resistance value R is calculated according to ohm's law.

8.5. Polarization Index (PI) Measurement

Polarization Index (PI) refers to the ratio of insulation resistance between 10 minutes and 1 minute. The polarization index test takes 10 minutes to complete. The polarization test will be completed and saved when the insulation test is 10 minutes or longer. In the custom setting mode, the user can select the calculation formula of PI.

8.6. Dielectric Absorption Ratio (DAR) Measurement

Dielectric Absorption Ratio refers to the ratio of insulation resistance between 1 minute and 15 seconds. Dielectric absorption ratio needs to be completed within 1 minute. Therefore, for all insulation tests less than 1 minute, the measurement data will be stored as invalid data. When the insulation test time is 1 minute or longer, the absorption ratio is included in the results. In the custom setting mode, the user can select the calculation formula of DAR.

8.7. Ramp(RAMP) Measurement

Ramp test mode is an automated test process. After the test starts, the output voltage gradually rises to the selected voltage gear, and the instrument records the insulation resistance value every second during the voltage rising process. When the insulator is defective, the resistance value will decrease along with the increase of the applied voltage and time; when the insulator is not defective, the insulation resistance will basically remain unchanged during the voltage rising process.

It should be noted that when selecting a lower gear voltage and in the initial stage of voltage rising, the voltage fluctuation will be large, because the high voltage output is difficult to control in the low voltage stage, which is a normal phenomenon.

8.8. Step(SETP) Measurement

Step test mode is an automated test process. After the test starts, the output voltage gradually rises with 10% of the selected voltage gear, and the instrument records the insulation resistance value every step during the voltage rising process. When the insulator is defective, the resistance value will decrease along with the increase of the applied voltage and time; when the insulator is not defective, the insulation resistance will basically remain unchanged during the voltage rising process.

It should be noted that when selecting a lower gear voltage and in the initial stage of voltage rising, the voltage fluctuation will be large, because the high voltage output is difficult to control in the low voltage stage, which is a normal phenomenon.

8.9. Voltage(V) Measurement

This instrument has the function of measuring AC and DC voltage. When measuring insulation resistance, this function is only used to help check whether the tested circuit is live. Do not measure AC or DC voltage above 1000V to avoid damaging the tester.

When testing the voltage, turn the rotary knob to the voltage test gear "V" to enter the voltage measurement mode, connect the high voltage red test line to the LINE port, and connect the ground black line to the EARTH port. As shown in Figure below:

1	AC/DC and DC ± wiring connection indication
2	AC/DC voltage TRMS
3	AC power frequency type, automatically judge the measured power frequency, and higher frequencies are all regarded as DC systems.
4	When the initial voltage value is not 0V, click to calibrate it to 0V.
5	Bluetooth, USB, battery power indication
		When measuring DC voltage, connect the red test line to the positive pole and the black test line to the negative pole. If the connection is reversed, there will be a prompt at position 1. Please correct it immediately. Long-term reverse connection of external DC voltage will cause irreversible damage to the tester.
		Do not measure AC/DC voltage above 1000V to avoid damaging the tester.

8.10. Setting

The tester can set the date and time, and select the calculation formula.

When modifying the date and time, slide left on the screen to switch to the test record browsing page, then slide left again to enter the clock setting interface. Slide up and down to select the time, then press confirm. As shown in Figure 13.

When modifying the formula, check the calculation formula to be used. After all the settings are modified and finished, press the Accept button to save the modification and take effect and return to the previous page.

Calibration requires precision instruments and specialized skills, the content is beyond the scope of this manual.

1	Date and time setting
2	Accept and save the setting value
3	Give up the modify value and return back to test interface
4	Calibration procedure, for professional use only
5	PI formula select
6	DAR formula select
7	Bluetooth, USB, battery power indication
8	Date and time setting

9.Consult Test Record

In each measurement mode, slide the screen to the left, and the screen switches to the test record browsing page.

9.1. Normal Test Mode Record Interface

9.2. Ramp Test Record Interface

9.3. Step Test Record Interface

10. Normal Wiring Connection Method

10.1.The Insulation Resistance Test of Cable

1）Normal two-wires measurement connection mode

There is leakage current on the surface of the inner insulation layer near the end of the cable. This leakage current is also in the measurement current of the "-" terminal, which will make the measurement resistance reading value lower than the actual insulation resistance value. Non-ultra high resistance values can be measured in this way. 

2）Ultra high resistance value 3-wire measurement connection mode

Wrapping the bare metal wire with good conductivity around the periphery of the inner insulation layer, and prevent the leakage current on the surface of the measured object by connecting the safety terminal to the outer conductor of the inner insulation layer. The surface leakage current will be directed to the safety terminal in order to eliminate the surface leakage current on the measurement path between the +/- poles and improve the accuracy of the measurement reading.

3）Ultra high resistance value 3-wire insulation resistance measurement connection mode

Wrapping the bare metal wires with good conductivity around the periphery of the inner insulation layer and connecting safety terminals to the outer conductors of the inner insulation and unused wire. The surface leakage current will be directed to the safety terminal in order to eliminate the surface leakage current on the measurement path between the +/- poles, which ensures that the measured insulation resistance is the insulation resistance between the selected cable and the outer insulation resistance, while eliminating leakage paths between cables.

4）Ultra high resistance value 3-wire insulation resistance measurement connection mode

Wrapping the bare metal wires with good conductivity around the periphery of the inner insulation and connecting safety terminals to the outer conductors of the inner insulation layer. The surface leakage current will be directed to the safety terminal in order to eliminate the surface leakage current on the measurement path between the +/- poles, which ensures that the measured insulation resistance is the insulation resistance between the selected cable, while eliminating leakage paths between cables.

10.2 Transformer Insulation Resistance Test

1）The insulation resistance test between primary winding and secondary winding to ground

2）The insulation resistance test between the primary winding (grounded) and the secondary winding

3）Insulation resistance test between secondary windings

11. Bluetooth Communication

11.1. Software Introduction

This software is a mobile phone APP that only supports mobile phones with Android system 4.0 or above. It is a Bluetooth APP used to connect to this instrument and does not support other devices with Bluetooth function.

11.2. Software Installation

Use the mobile browser to scan the QR code to obtain the APP software download link. Need to obtain the corresponding permissions during installation. Please click Agree or Allow.

11.3. Software Connection

After downloading the software, open the software and turn on the mobile phone Bluetooth, find the device whose name begins with HVIR, and click Connect to operate.

12. USB Communication

Before use, install the USB driver and the data upload software of this instrument.

Log in to the official website to download the data upload software of the corresponding model.

13. Battery And Charge

When the battery power is only 1-2 grids, please charge in time. The charge indicator will flash green when charging, and stay green when fully charged.

Shutdown and confirm that the tester is in off state, and connect the charger to charge through the mains.

If the tester will not be used for a long time, please charge every 2 months.

The standard charger must be used for charging. After charging, please put away the charger so that it will be convenient to use next time.

14. Instrument Maintenance

To avoid electric shock or personal injury

Do not try to repair or maintain the instrument out of scope described in this manual.

This instrument is for maintenance by authorized personnel only.

The user shall not replace any part of the instrument without permission.

The accuracy of the instrument can be maintained for 1 year after calibration at 23℃±5℃ (operating temperature: 0℃~35℃). For operating temperatures outside the range (-20℃ to 0℃ and 35℃ to 50℃), error increases by ±0.25% per ℃.

Clean: In order to avoid the risk of electric shock or personal injury, before cleaning the instrument, you should wring out the cloth and do not let any terminal touch water. Clean the shell regularly with a mild cleaner. Do not use abrasive or solvent to clean this instrument.

Store: After use, the instrument should be stored in a dry and clean environment.

Use, disassembly, calibration, and repair of this tester must be performed by authorized personnel.