Ground Bond Tester is to measure the contact resistance between the ground wire and the shell according to the principles of Ohm’s Law, which provides a current to the contact point as follows, current and voltage values can be tested, the resistance value can be calculated according to Ohm’s Law.
Ground Resistance Testing
Ground resistance testing is to measure contact resistance between the appliance ground wire and shell based on principles of Ohm Law, which as following, offer a current to contact point, the current and voltage values can be tested, resistance value can be calculate according to Ohm Law. lf the contact resistance of the grounding line can through harsh environment test and under condition of normal use, the appliance should be security.
Every product has its own technical specifications, according to security requirements, a constant current should be offered to contact point and the current must be maintained far a required time, if the contact point resistance is maintained in a required range within required time, operation can be processed under normal conditions, proper design and construction will protect users from the threat of accidental shock.
Although you can use a general resistance meter to test the contact resistance, resistance meter only can output a low current, which can’t meet the security requirements and get recognized. The user will often touch to the appliance, most of security inspection requires 25 amps, except CSA, requires 30 amps, alsa, current must last 60 seconds, and resistance within 1OOmO.
Far appliance user is not easy to touch, the specifications usually more broad, generally, 1O amps far current, and contact resistance within 500m0, while time is recognized as 60 seconds. in the world, there is still some specifications higher than the above criteria.
in security requirements, contact resistance of ground wire need to be tested firstly (special requirements), only contact resistance meet ruled requirements, dielectric withstand test can be processed.
Ground Resistance Tester has AC & DC output form, both can test the resistance aut correctly, but the destructive to poor contact point is significantly different duo to resistance value is calculated on
Ground Bond Tester Parameters
| Model | MT-9930A | |||
| input | lnput voltage | 220VAC±10% | ||
| lnput Frequency | 47Hz~ 63Hz | |||
| Fuse | 5A/250VAC | |||
| output | Output
Range |
Current | 10A ~ | 60A |
| Output
Accuracy |
Current | ± (2% setting value +5 dgts) | ||
| Output
Resolution |
Current | 0.01A | ||
| Output Max. Rated
Power |
360VA (6V60A) | |||
| Output
Voltage |
Max. | 6V | ||
| Output
Ripple |
Voltage | While full load <300mVp-p | ||
| Current Stability | ±1.0% | |||
| current screen | Display Range | 10A ~ | 60A | |
| Display Resolution | 0.01A | |||
| TestAccuracy | ±(0.5% display value+5 dgts) | |||
| resistance indicator | Display Range | O.OOun 600.00mn |
| Display Resolution | 0.01mn C 600.00mn 100.00mn ) ;
0.001mn ( 99.999mn 1O.OOO mn ) ; 0.1un ( 9.9999mn 1.0000mn) ; 0.01un ( 999.99un O.OO un ) ; |
|
| TestAccuracy | ± (0.5% display value+5 dgts) | |
| resistance high limit setting | Setting Range | O 600.00mn C 1 O.OOA 20.00A) ;
O 300.00mn ( 20.01A 30.00A) ; O 200.00mn ( 30.01A 40.00A) ; O 150.00mn ( 40.01A 50.00A) ; O 120.00mn ( 50.01A 60.00A) ; |
| Display Resolution | 0.01mn ( 600.00mn 100.00mn ) ;
0.001mn C 99.999mn 1o.ooomn ) ; 0.1un ( 9.9999mn 1.0000mn) ; 0.01un C 999.99un O.O oun ) ; |
|
| TestAccuracy | ± (0.5% Setting value +5 dgts) | |
| resistance lower limit setting | Setting Range | O 600.00mn ( 1O.OOA 20.00A) ;
O 300.00mn ( 20.01A 30.00A) ; O 200.00mn ( 30.01A 40.00A) ; O 150.00mn ( 40.01A 50.00A) ; O 120.00mn ( 50.01A 60.00A) ; |
| Display Resolution | 0.01mn C 600.00mn 100.00mn ) ;
0.001mn ( 99.999mn 10.000mn ) ; 0.1un ( 9.9999mn 1.0000mn ) ; 0.01un C 999.99un o.ooun ) ; |
|
| TestAccuracy | ± (0.5% setting value +5 dgts) | |
| test time | 0.5S 999.9S ( 0.0S continuous testing) | |
| Time Resolution | 0.1S | |
| Time Accuracy | ±(0.1% setting value +0.05 S) | |
| Dimension ( Width*Height*Deepth ) | 280mmx 100mmx345mm | |
| Weight | 4Kg | |
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