Ground compensation Cable TP-GCC150

Features

1.5 m long cable provides ample length for connecting differential WiFiScope to the test subject and ground
Includes three different size alligator clips (TP-AC80I, TP-AC10I, TP-AC5) to accommodate different ground connection needs
2 mm banana plug on the instrument side and 4 mm banana plug on the alligator clip side for secure and simple connections
Alligator clips support different voltage and current ratings: 1000 V, 60 V, and 60 V with various current capacities (32 A, 10 A, and 5 A)
Ensures accurate measurements by grounding the differential WiFiScope and eliminating floating voltages
Clips are double isolated for safe operation during measurements

The Ground compensation Cable TP-GCC150 consists of a special ground compensation cable, together with three corresponding ground clips in different sizes.

The 1.5 m long ground compensation cable has a 2 mm banana plug at one end, that plugs into the small banana socket at the rear of differential WiFiScope. The other end has a 4 mm banana plug that connects to an alligator clip that can be connected to the ground of the test subject.

Three different size alligator clips are included:

Alligator Clip TP-AC80I – Black
Alligator Clip TP-AC10I – Black
Alligator Clip TP-AC5 – Black

When using the the ground compensation cable
The ground compensation cable between the differential WiFiScope and test subject is required when the differential WiFiScope is connected to the mains adapter and/or the USB cable, and the test subject is not grounded.

When is the ground compensation not required
The ground compensation cable between the differential WiFiScope and test subject is not required when:

When the differential WiFiScope is equipped with option SafeGround and an input is switched to single ended (SafeGround is enabled)
When the differential WiFiScope operates on battery power only
When the input range of the differential WiFiScope is set to 20 V or higher
Why ground compensation?
Mains power supplies usually have noise filtering capacitors between the mains input and the output. When a device is powered by such power supply and it is not grounded, the device will float relative to the ground. This floating voltage can get as high as the mains voltage. This is however not dangerous because the current that can flow is very small.

When measuring with a differential WiFiScope, this floating voltage can affect your measurements because of the high input impedance of the differential WiFiScope, which is 1 MOhm.

When the differential WiFiScope is only battery powered, your measurements will not be affected, because the differential WiFiScope will also float on the floating voltage of the test subject.

When the differential WiFiScope is connected to the USB or connected to the mains, the floating voltage will cause a high common mode voltage at the input of the differential WiFiScope. The inputs of the differential WiFiScope will then clip and you will get strange measurement readings.

The common mode range of the differential WiFiScope is 2 V (input range 200 mV to 800 mV), 20 V (input range 2 V to 8 V) or 200 V (input range 20V to 80V). So if you measure in the 200mV range and the floating voltage becomes greater than 2 V, the input channel of the differential WiFiScope will clip and you will measure strange readings. If you measure in the 20 V range (or higher) you will suffer much less from the floating voltage because these are usually smaller than 200 V.

When the differential WiFiScope ground is connected to the ground of the test subject, they will both get the same ground level, so there will be no (high) common mode voltage due to floating. You will get no measurement errors then.

Specifications

The table below shows detailed specifications of the Ground compensation Cable TP-GCC150.

Ground compensation Cable TP-GCC150
Cable
Length	150 cm
Connectors
Instrument side	2 mm banana plug
Alligator clip side	4 mm banaba plug
Weight	25 g

Alligator clips	Alligator Clip TP-AC80I – Black	Alligator Clip TP-AC10I – Black	Alligator Clip TP-AC5 – Black
Connector	4 mm shrouded banana socket	4 mm shrouded banana socket	4 mm banana socket
Rated voltage	1000 V	60 V	60 V
Rated current	32 A	10 A	5 A
Safety	double isolated
Dimensions
Length	82 mm	58 mm	60 mm
Width	13 mm	13 mm	9 mm
Height	34 mm	27 mm	14 mm
Clamping range	22 mm	12 mm	10 mm
Weight	13 g	8 g	3 g
Color	black	black	black