What is the difference between a differential probe and a normal probe? The ground of a normal probe is connected to the ground of an oscilloscope.probe test system If the oscilloscope does not have the function of isolating channels. The ground of all channels of the oscilloscope is connected together. At the same time, this ground is also connected to the utility ground through the power plug. Then if you want to use the oscilloscope to test two, or more signals that do not share a common ground, this probe is obviously not available, because you will be measured by the point of the "ground" are connected to a short circuit together, differential probes can be used in this case, because their ground and the oscilloscope's ground, and the ground of the other channels, is isolated.

Also, some people will remove the ground from the oscilloscope, i.e. disconnect the ground from the triple plug.RF probes This can be used to float some non-ground-referenced quantities. However, this is not recommended. The main advantages of differential probes are: bandwidth, fidelity and usability, common mode rejection, and repeatability of measurements. Today we recommend this cost-effective differential probe.

N1140A (14KVp-p, 100MHz) Differential Probe

The N1140A (100MHz X1000 X100 14KVp-p model matches any brand of oscilloscope with a precision of 1%.probe card This model of differential probe measures accurately and operates more sensitively, the following are the specifications of the N1140A differential probe:

N1140A Differential Probe Specifications

Bandwidth: 100MHz

Tolerance: ± 1%

Input impedance: 10MΩ//2 p F each side ground

Output Voltage -Swing(into 50 KΩ load): 7V

-Offset(typical): <±5Mv

-Input Impedance(typical): 50Ω(for using 1M ohm input system oscilloscope)

Power supply - external: power leads

BNC length: 90cm

Test lead length: 60cm

Weight: 500g

Dimensions (L×W×H): 84x36x245mm

Model: N1140A

Attenuation Ratio ：1:1000/100

Common Mode Rejection Ratio (CMRR)(typical): -80dB@60Hz,-50d B@100KHz

Maximum Input Differential Voltage

(Peak to Peak)

14KV@1/1000

1400V@1/100

Maximum Input Differential Voltage (Peak to Peak): 14KV@1/1000 & 1400V@1/100

Common Mode Reciprocity Ratio (CMRR): 1000V rms CATIII

Differential probes are mainly used to observe differential signals, a good differential probe must have the point: strong anti-interference ability, can effectively suppress EMI, timing positioning accurate features.

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