Compliance HT-3000PR AC/DC Hipot/Ground Continuity Tester
The New product of our Hipot Line Tester, the HT-PR serie Hipot Tester now with adjustable ground continuity test in range of 0.08-1.5 Ω, Auto-offset for test leads up to 1.0 Ω,
Performs 0-2000 AC or 0-2800 DC Hipot Test.
Neutral/Hot to Ground Leakage current test up to 20 mA AC or 5 mA DC.
Front Panel Controls, Indicators and Connectors
![Compliance-HT-PR-FrontPanel]()
| ITEM |
NAME |
FUNCTION |
| 1 |
RESET Button / Red Indicator |
When lit, indicates that the HT-PR tester is unarmed. This button must be pushed before the TEST button is functional. When the RESET button is pressed, the red RESET indicator goes out and the yellow TEST indicator is lit. PRESSING THE RESET BUTTON AT ANY TIME STOPS THE TEST.
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| 2 |
TEST Button / Yellow Indicator |
When lit, indicates that the HT-PR tester is ready to test the connected equipment. The yellow TEST indicator goes out when the TEST button is pressed.
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| 3 |
Ground OK / Ground Open LED's |
Indicates result of Ground Continuity test between grounding pin of the line cord and exposed metal parts of the equipment under test. If the ground path resistance it is higher than the indicated on the ground setting, or if the leads are not properly connected, the red Ground Open LED will light, the internal buzzer will sound, and the test will be terminated. If the ground circuit resistance is acceptable, the green continuity LED will light and the test will continue. If the Ground Check switch is defeated by the operator, both LED's will be lit for the duration of the test.
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| 4 |
Excess Leakage LED |
Indicates failure of leakage current test. If leakage current between the primary circuit and ground is higher than the preset value, the red LED will light, the internal buzzer will sound, and the test will be terminated.
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| 5 |
Full Voltage LED |
If full voltage is successfully reached, the Full Voltage LED will light and the high voltage duration timer starts.
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| 6 |
Hipot Fail LED |
Indicates failure of high voltage test. If arcing or a flashover of the insulation system between primary parts and ground is encountered, the red breakdown LED will light, the internal buzzer will sound, and the test will be terminated.
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| 7 |
Hipot Pass LED |
At the end of the preset high voltage duration time, if no failures are encountered, the green light will light and the test will terminate.
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| 8 |
Voltage Meter |
Provides visual indication to the operator of the actual output voltage of the HT-PR tester. Used to set the test voltage level during the setup procedure.
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| 9 |
Ramp Bar Graph LED’s |
Individual LED’s light in sequence from left to right as the test voltage ramps from zero to full voltage. LED’s turn off (ramp back down) at end of test.
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| 10 |
Return Lead Receptacle |
Grounded banana plug receptacle. The 18 AWG Test Return Lead provided is connected here.
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| 11 |
High Voltage Device Receptacle |
NEMA 5-15R orange receptacle. For connection of the equipment under test. See items 11a and 11b for slots description.
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| 11a |
High Voltage Output |
On the NEMA plug, the two top vertical slots are tie together, the high voltage to perform the Dielectric Withstand test comes true these two slots.
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| 11b |
Ground Continuity Measurement Point |
On the NEMA plug, the bottom round slot is the ground continuity measured point. Ground continuity test circuit is measured from this slot (Item 11b) to the Return Lead Receptacle (Item 10).
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| 12 |
High Voltage Test Jack |
Red High Voltage jack. For connection of high voltage test lead for testing insulating materials, etc. This option is only available on HT-3000PR model.
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| 13 |
AC/DC Switch |
Selects AC or DC output. Changing switch setting does not change output until the next time the Reset button is pushed. This option is only available on HT-3000PR model.
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Rear Panel Controls, Indicators and Connectors
![Compliance-HT-PR-RearPanel]()
| ITEM |
NAME |
FUNCTION |
| 1 |
Ground Check Switch |
Enables or disables the Ground Continuity test.
Turn ON for use with three-wire (grounded) power supply cords.
Turn OFF for use with two-wire power supply cords.
(When ON, conducts Ground Continuity test between the chassis and the grounding pin of the line cord of the equipment being tested. When OFF, Ground Continuity test is bypassed for testing of double-insulated equipment and other types of equipment without a grounding pin in the line cord.)
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| 2 |
Directions |
Provides directions for tester operation to test personnel.
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| 3 |
Ramp Time Adjustment |
Used to adjust the amount of time used to increase the high voltage from zero volts to the required level. See "High Voltage Ramp Time" on Adjustment section for correct procedure.
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| 4 |
Test Time Adjustment |
Used to adjust high voltage test duration. See "Adjustment of the High Voltage Test Duration" section for this procedure.
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| 5 |
Leakage Limit Adjustment |
Used to adjust the trip level for the excessive leakage current test. See "Leakage Current Level" on Adjustment section for more information.
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| 6 |
Voltage Adjust |
Used to adjust the High Voltage output. See "High Voltage Level" on the Adjustment section for correct procedure.
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| 7 |
Calibration Resistor |
(Optional)
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| 8 |
Appliance Inlet / Fuse holder / Power Switch |
Use supplied cord set to connect tester to appropriate source of supply. Replace line fuse. Turn Tester ON/OFF.
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| 9 |
Fuse replacement warning / Rating of supply |
Specifies replacement fuse and required supply voltage.
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| 10 |
Ground Resistance Setting Adjustment |
Used to adjust the Ground Continuity pass/fail point setting. See “Ground Continuity” on the Adjustment section for more information
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| 11 |
Ground Offset Button |
This button can perform two different functions. Pressing and holding it for 1 second, the HT-PR will measure and display on the front display the Ground Continuity resistance of the EUT under test. Pressing and holding the button for 5 seconds will compensate the resistance of the test cables of fixture, see “Ground Continuity Offset Adjustment” and “Ground Continuity Resistance Measurement” sections for more details.
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An Introduction to Dielectric Withstand Testing with the HT-PR
The continuity test/dielectric withstand test is a production line test which is recognized by safety agencies worldwide as a valid criterion of safe assembly of end-use equipment. The test ensures that the primary circuit power and ground conductors were properly wired and connected for safe operation. It also applies a high-voltage potential between power and ground conductors to make sure that no unintentional leakage or arcing paths exist between power and ground. The test consists of a ground continuity check, a leakage current check and a high voltage check. It is non-destructive to the equipment under test, and can be accomplished in a short time.
The purpose of dielectric testing: Dielectric testing is a simple, non-destructive method of verifying the adequacy of electrical insulation to withstand the sort of transients that can occur during transient (surge) events. In addition, the dielectric test can verify that the insulation in question has an adequate amount of performance "headroom". This is necessary to ensure that the insulation does not fail because of degradation of the insulation due to aging, moisture, wear due to vibration, etc.
The method of dielectric testing: A high voltage (typically 1000 Volts or higher) is applied between two conductors that are "supposed" to be electrically insulated from each other. If the two conductors (an insulated "live" wire, and a metal enclosure, for example) are completely isolated from each other, then the application of a large voltage difference between the two conductors will not allow current to flow between the conductors. The insulation will "withstand" the application of a large voltage potential between the two conductors - hence the term "dielectric withstand test". In general, there are two results of the test that are considered a failure of the insulation: (1) excessive current flow during the test due to low insulation resistance of the insulating material which separates the two conductors, and (2) an abrupt dielectric breakdown due to electrical arcing or discharge, either through the insulation material, over the surface of the insulation material, or a discharge through air.
The determination of a suitable test voltage: If the test voltage is too low, the insulation material in question will not be adequately stressed during the test. This could cause inadequate insulation to pass the test, and be considered acceptable. On the other hand, if the test voltage is too high, then the test could cause permanent damage to an insulation material that is otherwise adequate for the application. A general "rule of thumb" that is used for the testing of mains wiring which operates at voltages of 120-240Vac is 1000V plus two times the operating voltage. Using this rule, 120V wiring would be tested using a voltage of 1240Vac.
Duration of the test: Generally, the test voltage is applied for one minute, in order to adequately stress the insulation. Many standards allow the test duration to be reduced to 1 second for production-line testing in order to accommodate large-volume production testing. In this case, standards quite often require that the test voltage be increased by 20% in order to ensure that the shorter test duration of one second will adequately test the insulation in question.