WTH-CS/BT-1000V
www.watchfuleyesolutions.com Portable Surge Protective Device Tester

Has the surge protective device (SPD) in the system been broken down?
Can the SPD which has been used for years continue to be used?
If the system voltage is 380V, is the voltage of SPD selected correctly or not?
What’s the actual break-over voltage that caused by surge?
Portable Surge Protective Device Tester
Model: WTH-CS/BT-1000V
Ordering Code: US128002
Ⅰ. Testing methods for voltage-limiting type SPDs:
Choose FUNCTION 1, press TEST button, Break-over Voltage and Leakage Current will display on the screen.
Ⅱ. Testing methods for switch-type SPDs:
Choose FUNCTION 6, press TEST button, Breakdown Voltage will display on the screen.

WTH-CS/BT-1000V Portable SPD Tester applies to the measurement of the parameters of the voltage-limiting type and switch-type SPDs. These data are used for evaluating the operating characteristics of the SPDs and the product selection to cooperate with the construction site.

Main Features of WTH-CS/BT-1000V SPD Tester:
1. Portable and convenient use with batteries, rechargeable batteries or external power supply; suitable for office and onsite measurements
2. Easy, rapid and precise measurement by pressing one button for testing and immediate display SPD data features
3. While MOV testing, a buzzer will sound if the deviation of break-over voltage exceeds the default value by ± 5%.
4. While MOV testing, a buzzer will sound if the leakage current exceeds 20 μA.
5. Applied to testing both MOV-type and GDT- type SPDs
6. Precise test the break-over voltage under the constant current 1mA
7. Precise test the leakage current under 75% of the break-over voltage
8. The voltage of the tester can be boosted up to 1000V DC
9.Convenient multimeter calibration methods

Technical Specification of WTH-CS/BT-1000V:
Range of break-over voltage for testing Un(U1mA): 0~1000V
Range of leakage current for testing: 0~25μA, ±2.5%, ±0.5μA
FUNCTION 1 testing mode: for testing voltage-limiting type SPDs, break-over voltage and leakage current will display in about 2.5 seconds.
Range of breakdown voltage for testing: 0~1000V, ±2.5%, ±5V(120-1000V)
FUNCTION 6 testing mode: for testing switch-type SPDs, boost the DC voltage step by step at a rate of 100V/second for a precise measurement of breakdown voltage.
Minimum resolution of the break-over Voltage: 1V
Minimum resolution of the leakage current: 0.1μA
Operation temperature: 14°F ~ +122°F (-10°C ~ +50°C)
Power supplies: four AA1.2V rechargeable batteries, four AA1.5V batteries or 5V2.5A external power transformers
Weight: 570g/1.26 lb (Without accessories)
Dimensions: 245mm×120mm×50mm(9.65in×4.72in ×1.97in)

For more product information, please visit Watchful Eye at

WTH-CS/BT-1000V
www.watchfuleyesolutions.com Portable Surge Protective Device Tester

WTH-CS/BT-1000V Surge Protective Device Tester
Contents 1
Model & Ordering Code 2
Main Features 2
Technical Specification 3
Testing Data for Reference 3
Dimensions 3
Introduction of the SPD Tester 4
Safety Instructions 5
Power Supply of the SPD Tester 5
Test Error 5
Testing Banana Plugs and Testing Pens 5
Testing Preparation and Testing Mode Selection 5
FUNCTION SELECTION Buttons 6
TESTING MODE AND PROCEDURE:
Ⅰ. Rapid Test of Voltage-limiting(MOV-Type) SPDs 7
Ⅱ. Accurate Break-Over Voltage Test and Calibration Mode 8
Ⅲ. Precise Leakage Current Test of MOV and Leakage Current Calibration 9
Ⅳ. Precise Leakage Current Test under the Fine-Turning Ad Voltage Mode 10
Ⅴ. Rapid Test of switch-type(GDT- type) SPDs 11
Ⅵ. Precise Test of GDT and Break-down Voltage Calibration 11
Ⅶ. Calibration Steps of the Tester 12

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Has the surge protective device (SPD) in the system been broken down?
Can the SPD which has been used for years continue to be used?
If the system voltage is 380V, is the voltage of SPD selected correctly or not?
What’s the actual break-over voltage that caused by surge?
Portable Surge Protective Device Tester
Model: WTH-CS/BT-1000V
Ordering Code: US128002

Ⅰ. Rapid testing methods for voltage-limiting type(MOV-type) SPDs:
Choose FUNCTION 1, press TEST button, Break-over Voltage and Leakage Current will display on the screen.
Ⅱ. Rapid Testing methods for switch-type(GDT-type) SPDs:
Choose FUNCTION 6, press the testing button, “Breakdown Voltage” will display on the screen.
WTH-CS/BT-1000V Portable SPD Tester applies to the measurement of the parameters of the voltage-limiting type and switch-type SPDs. These data are used for evaluating the operating characteristics of the SPDs and the product selection to cooperate with the construction site.

Main Features of WTH-CS/BT-1000V SPD Tester:
1. Portable and convenient use with batteries, rechargeable batteries or external power supply; suitable for office and onsite measurements
2. Easy, rapid and precise measurement by pressing one button for testing and immediate display SPD data features
3. While MOV testing, a buzzer will sound if the deviation of break-over voltage exceeds the default value by ± 5%.
4. While MOV testing, a buzzer will sound if the leakage current exceeds 20 μA.
5. Applied to testing both MOV-type and GDT- type SPDs
6. Precise break-over voltage test under the constant current 1mA
7. Precise leakage current test under 75% of the break-over voltage
8. The voltage of the tester can be boosted up to 1000V DC
9.Convenient multimeter calibration methods

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Technical Specification of WTH-CS/BT-1000V:
Range of break-over voltage for testing Un(U1mA): 0~1000V
Range of leakage current for testing: 0~25μA, ±2.5%, ±0.5μA
FUNCTION 1 testing mode: for testing voltage-limiting type SPDs, break-over voltage and leakage current will display in about 2.5 seconds.
Range of breakdown voltage for testing: 0~1000V, ±2.5%, ±5V(120-1000V)
FUNCTION 6 testing mode: for testing switch-type SPDs, boost the DC voltage step by step at a rate of 100V/second for an accurate measurement of breakdown voltage.
Minimum resolution of the break-over Voltage: 1V
Minimum resolution of the leakage current: 0.1μA
Operation temperature: 32°F ~ +122°F (0°C ~ +50°C)
Power supplies: four AA1.2V rechargeable batteries, four AA1.5V batteries or 5V2.5A external power transformers
Weight: 570g/1.26 lb (Without accessories)
Dimensions: 245mm×120mm×50mm(9.65in×4.72in ×1.97in)

Data for Reference:
The breakover voltage of surge protective device refers to the value of the voltage which is tested when 1mA current flows through the surge protective device while the testing voltage is boosted.
Since only the value of Uc is marked on the label of a surge protection product, the breakover voltages of the products specified in corresponding with the Uc values by different manufacturers during actual production maybe vary. The following are the parameters of "Watchful Eye" surge protective devices for reference.

Power Supply System UC U1mA Surge Arrester Testing
110V、120/208V 150V 257-298V WTH-40/C/R/1P-150
220/380V 275V 447-518V WTH-40/C/R/1P-275
220/380V、277/480V 385V 590-683V WTH-40/C/R/1P-385
347/600V 550V 780-903V WTH-40/C/R/1P-550

Dimensions:

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Introduction of the SPD tester

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Safety Instructions
1. USE EXTREME CAUTION In the testing process, the voltage boosts up to above 1000V, and the maximum current is 1mA. DO NOT touch the exposed part of the test banana plug or the test pens.
2. DO NOT press the TEST button when the tester isn’t connected to a tested sample. Doing so can damage the tester.
3. ALWAYS turn off the power supply promptly during the long standby mode prompting.
4. ALWAYS do the testing strictly according to the operation instructions. Non-qualified persons are not allowed to do the calibration or open the tester without professional guidance.

Power Supply of the SPD Tester
There are two power supply modes:
1. Connect to 5V2.5ADC external power supply, plug in the power supply, the initial value "0" will display on the screen, that is the standby mode.
2. Install 4 AA batteries or rechargeable batteries, press the red button on the right side to turn on the battery power supply switch, the voltage of the batteries will display on the screen first, and then display the initial value "0", that is the standby mode.

Note:
1. If the voltage is lower than 4.5V, the upper left corner of the screen will display "Lobat".
2. If the standby time exceeds 300 seconds(every 300 seconds interval), the tester will emit a continuous sound of "Beep.Beep" to remind you of shutting down to save energy, avoiding running out of batteries due to long-time standby.

Test Error
If the test error is in the unacceptable range, calibrate to the common voltage segments and critical leakage current, e.g., if a calibration for the 500V voltage segment is applied in a 300V voltage segment test, it will result in errors.

Test Banana Plugs and Test Pens
1. There are two test banana plug jacks on the top of the tester, insert the red and black test banana plugs into the corresponding colored jacks.
2. The test pens include a clip type and a probe type. The other ends of the two test banana plugs can be put on test clips or test probes according to the test requirements (e.g., use the clip-type test pens for testing SPD modules without bases).
3. Take out the SPD module to be tested
4. Clamp the two poles of the voltage-limiting(MOV-type) SPD with the test clips.

Test Preparation and Selection of Testing Modes
Set the mode button according to the tested SPD sample type.
Note:
if a default value of break-over voltage is set, test an SPD with FUNCTION 1 testing method, a long BUZZER will sound If the deviation of the tested value exceeds the default value by ± 5%.
Take WTH-40/C/R/1P-385 as the tested sample of voltage-limiting(MOV-type) SPD
Take WTH-65/G/1P-255 as the tested sample of switch-type(GDT-type) SPD

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FUNCTION SELECTION
FOR VOLTAGE-LIMITING SPDS (MOV-TYPE)
1 Standard Test: the break-over voltage and the leakage current are displayed. A buzzer will sound if the deviation exceeds the default value by ± 5%.
2 Precise test to verify the current outputs (1mA) and test the break-over voltage: the constant current(1mA) outputs and the break-over voltage will be continuously displayed.
3 Precise test for the leakage current: the break-over voltage is displayed first, then the 75% value of the break-over voltage and the leakage current will be alternately displayed.
4 Customized test the leakage current by positive deviation: the 75% value of the break-over voltage and leakage current will be alternately displayed. Press the TEST button to boost the voltage in increments of +1Ad (1Ad=0.293V); then the value of leakage current under the boosted voltage will be alternately displayed with the Ad value.
5 Customized test for leakage current by negative deviation: the 75% value of break-over voltage and leakage current displays alternately. Press the TEST button to reduce the voltage in negative increments of -1Ad (1Ad=0.293V), then the value of leakage current under the boosted voltage will be alternately displayed with the Ad value.

FOR SWITCH-TYPE SPDS (GDT-TYPE)
6 Standard Test: boost the voltage at a rate of 100V/sec, and the voltage boosting progress bar is displayed. Finally, the breakdown voltage of the Switch-type SPD will be displayed.
7 Precise Test: boost the voltage at a rate of 100V/sec, and the voltage boosting progress bar is displayed; next, the breakdown voltage of the Switch-type SPD will be displayed; hold the TEST button to boost the voltage rapidly again at a rate of 100V/sec until it reaches the point that differs by 100Ad (1Ad=0.293V) from the value previously tested. Then lower the voltage boosting speed to 2Ad/sec. The highest voltage value finally shown in the DISPLAY is the breakdown voltage of the Switch-type SPD.

THE DEFAULT VALUE OF BREAK-OVER VOLTAGE FOR MOV-TYPE SPDS
8 Set the default value of the break-over voltage: when the default value of the break-over voltage blinks in the DISPLAY,
※ Press TEST button to increase the value; hold the TEST button to increase the value rapidly.
※ Press FUNCTION SELECT button to save the value. Then the tester will return to testing standby status with 1 in the display.

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Ⅰ. Rapid Test of MOV-Type SPDs
1. Function Selection Choose FUNCTION 1
2. Testing
Press TEST button, release the button when a BEEP sounds.
3. Read the testing data
The screen displays the break-over voltage and the leakage current under 75% of the break-over voltage of the tested MOV-type SPD; the whole process takes about 2.5 seconds.
4. Continue to test
1) According to the features of the MOV, it is normal that data inconsistency may occur between the first test and the second test, this characteristic of MOVs can be judged by the data from several more tests.
2) When the leakage current displays on the screen, press the TEST button; you’ll hear a "Beep". After the first test is completed, the second test will start automatically.
3) Also, when the screen returns to the "0" standby mode, press the TEST button to start the second test.
4. Exit to the standby mode
When the leakage current displays on the screen, in 1 second without any key operation, the screen will be cleared to "0" and will exit the test to return to standby mode.

Test with The Default Value of Break-over Voltage

1. Function Selection
Choose FUNCTION 8
2. Set the default value of the break-over voltage: when the default value of the break-over voltage blinks in the DISPLAY
※ Press TEST button to increase the value; hold the TEST button to increase the value rapidly.
※ Press FUNCTION SELECT button to save the value. Then the tester will return to testing standby status with 1 in the display.
3. Standard test with a default value of break-over voltage
The break-over voltage and leakage current displays, a long BUZZER will sound If the deviation of the tested value exceeds the default value by ± 5%.

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Ⅱ. Precise Test and Calibration Mode of Break-Over Voltage
1. Function Selection
Choose FUNCTION 2
2. Test
Press TEST button, release the button when a BEEP sounds.
3. Read the test data
Test the precise value of the break-over voltage until the screen continually displays the tested break-over voltage of the MOV-type SPD, read the test data.
4. Verify the current value of 1mA
1) Choose a multimeter "Fluke 87V" or any other multimeter with an accuracy of 0.1μA. Connect the multimeter in series with the MOV type SPD and the test pens, and verify the constant current output of 1mA.
2) The description of the MOV leakage current is given by the tested voltage value when the constant current is 1mA. According to this characteristic, the more accurate the 1mA constant current outputs, the more accurate the testing data of the break-over voltage will show on the display.
5. The calibration of the break-over voltage
1) Choose a multimeter "Fluke 87V" or any other multimeter with the accuracy of 0.1V.
2) Connect the multimeter probes in parallel with the SPD and the test pens.
3) In this mode, while maintaining the constant current of 1mA outputs, the tester continually displays the break-over voltage value.
4) Open the tester and adjust the tester R3 (Potentiometer) to make the tester display the same value as the multimeter. At this point, the calibration of the break-over voltage is completed.
6. Exit to the standby mode
In the state of displaying the break-over voltage, press the TEST button. When you hear a "Beep". Release the TEST button and the screen will be cleared to "0". Then exit the test to return to the standby mode.

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Ⅲ. Precise Test and Calibration of MOV Leakage Current
1. Function Selection
Choose FUNCTION 3
2. Testing
Press TEST button, release the button when a BEEP sounds.
3. Read the test data
The screen displays the break-over voltage of the tested MOV-type SPD, and then followed by the display of the leakage current under 75% of the break-over voltage every 1 second.
4. Precise testing of leakage current
In this mode, the constant voltage is 75% of the break-over voltage outputs. Read the accurate leakage current value of the MOV type SPD.
5. The calibration of 75% of the break-over voltage value
The characteristics of MOV and the error of 75% of the break-over voltage may have a great influence on the accuracy of the leakage current.
1) Choose a multimeter "Fluke 87V" or any other multimeter with an accuracy of 0.1V.
2) Connect the multimeter probes in parallel with the SPD and the test pens.
3) In this mode, the constant voltage is 75% of the break-over voltage outputs. The tester screen continually and alternately displays 75% of the break-over voltage value and the leakage current value as well.
4) Open the tester and adjust the tester R14(Potentiometer) to make the multimeter display the same value as that the tester. At this point, the calibration of 75% of the break-over voltage is completed.
6. The calibration of leakage current
1) Choose a multimeter "Fluke 87V" or any other multimeter with the accuracy of 0.1μA.
2) Connect the multimeter probes in series with the SPD and the test pens.
3) In this mode, the constant voltage is 75% of the break-over voltage outputs. The tester screen continually and alternately displays 75% of the break-over voltage value and the leakage current value as well.
4) Open the tester and adjust the tester R17(Potentiometer) to make the multimeter display the same value as the tester. At this point, the calibration of the leakage current is completed.
7. Exit to the standby mode
In the alternate display mode, press the TEST button, release the button when hearing a sound of "Beep". The screen will be cleared to "0" and exit the test to return to the standby mode.

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Ⅳ. Leakage Current Test under the Mode of Fine-Turning "Ad" Voltage

Note: 1Ad=0.293V

1. Function Selection
Choose FUNCTION 4 or 5
2. Testing
Press TEST button, release the button when a BEEP sounds.
3. Read the test data
The screen displays the break-over voltage of the tested MOV-type SPD. This is followed by the screen displaying the leakage current under 75% of the break-over voltage every 1 second.
4. The precise testing of leakage current
In this mode, the constant voltage is 75% of the break-over voltage outputs. Read the leakage current value of the MOV type SPD.
5. Enter the fine-turning voltage testing mode under 75% of the break-over voltage
In the alternate display mode, press the TEST button continually until hearing a sound of "Beep". Release the TEST button, and the screen alternately displays "0" and the leakage current, it enters the fine-turning voltage testing mode.
6. Leakage current testing under the Fine-turning testing "Ad" voltage mode
"0" represents 0Ad, which is the default base value of 75% of the break-over voltage. In this mode, adjust the constant voltage value based on the accuracy of 1Ad=0.293V.
1) Set the mode button to A position and press the TEST button. When hearing a sound of "Beep", each time reduce 1Ad voltage based on 75% of the break-over voltage value. The screen displays the adjusted "Ad" value, and the tester will accurately display the fine-turning constant voltage of the leakage current value.
2) Set the mode button to B position and press the TEST button. When hearing a sound of "Beep", each time boost 1Ad voltage based on 75% of the break-over voltage value. The screen displays the adjusted "Ad" value, and the tester will accurately display the fine-tuning constant voltage of the leakage current value.
7. More instructions of this function
1) According to the characteristics of MOV, the tested leakage current value will be inconsistent under 76%, 75% or 74% of the break-over voltage.
2) This function can test different leakage current values under different voltages more accurately
8. Exit to standby mode
In the test mode of adjusting "Ad" voltage, press the TEST button continually until hearing a sound of "Beep". Release the TEST button and the screen will be cleared to "0" and exit the test to return to standby mode.

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Ⅴ. GDT Test and Calibration
1. Function Selection
Choose FUNCTION 6
2. Testing
Press TEST button, release the button when a BEEP sounds.
3. Read the test data
The voltage is boosted at a rate of 100V/s. The screen will then display the breakdown voltage of the tested GDT-type SPD.
4. Exit to the standby mode
In about 1 second without any key operation, the screen will be cleared to "0". At this point, exit the test to the standby mode.

VI Precise Testing and Calibration of Breakdown Voltage
1. Function Selection
Choose FUNCTION 7
2.Slow boosting and calibration with a multimeter
Press the TEST button, and release the TEST button when a BEEP sounds.
3. Read the testing data
The voltage is boosted at the speed of 100V/s. The screen will display the breakdown voltage of the tested GDT-type SPD. Boost the voltage at the same rate again. When the voltage reaches close to the breakdown point of 100Ad, slow down boosting the voltage at a rate less than 1V/second. The screen will keep displaying the corresponding voltage values until the SPD is broken down, after which the breakdown voltage will display on the screen.
3. Calibration Mode of Breakdown Voltage
1) Choose a multimeter "Fluke 87V" or any other multimeter with the accuracy of 0.1V.
2) Connect the multimeter probes in parallel with the SPD and the test pens.
3) In this slow boosting mode, voltage will be boosted at the speed of less than 1V/second. Compare the voltage displayed on the tester screen with the measured voltage from the multimeter.
4) Open the back cover of the tester and adjust the tester R4(Potentiometer) to make the tester display the same value as the multimeter. The calibration of the breakdown voltage is then completed.
5. Exit to the standby mode
The screen will be cleared to "0" and you can exit the test to the standby mode in about 1 second without any key operation.

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ⅥI. Calibration Steps of the Tester
Opened the back cover of the tester with a screwdriver, find the potentiometer R3, R14, R17 and R4 in corresponding to the calibration functions.
Step 1. Calibrate the constant current of 1mA
Choose FUNCTION 2 to calibrate the stability of 1mA current(at current mode of a mutimeter)
Step 2. Calibrate the break-over voltage with R3
Choose FUNCTION 2 to calibrate the break-over voltage of MOV(at voltage mode of a mutimeter)
Step 3. Calibrate 75% of the break–over voltage with R14
Choose FUNCTION 2 to calibrate the 75% of break-over voltage(at voltage mode of a mutimeter)
Step 4. Calibrate the leakage current with R17
Choose FUNCTION 3 to calibrate the leakage current of MOV under 75% of break-over voltage (at voltage mode of a mutimeter)
Step 5. Calibrate the breakdown voltage with R4
Choose FUNCTION 7 to calibrate the breakdown voltage of GDT(at voltage mode of a mutimeter)

Note: R3, R14, R17 and R4 indicate potentiometers
(Open the back cover of an SPD tester with a screwdriver, the blue components in the following picture refer to potentiometers R3, R14, R17 and R4)



For more product information, please visit Watchful Eye at