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Probe selection

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Siva kumar
Posts: 1
Joined: June 8th, 2017, 10:10 pm
Country: India

Probe selection

Post by Siva kumar » June 8th, 2017, 10:30 pm

Hi ,

I am having an Tektronix osciloscope TBS1102 , i tried to measure the signals in the SMPS using that and probe TPP0101(300V) ,At once i touched the ground terminal (which is Pin 2 of the IC in attached schematics ) MCB got tripped .Please guide me whether i am using the right probe or do i need to change the probe.

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David N
Tektronix Applications
Tektronix Applications
Posts: 558
Joined: July 31st, 2008, 8:26 am

Re: Probe selection

Post by David N » June 12th, 2017, 3:13 pm

If you are using the standard probes that came with the TBS1102, when you attach the probe ground lead to the IC pin 2, you are actually connecting pin 2 to earth ground. If your design is not tying pin 2 to earth ground, then you should consider using a HV differential probe. Such as the P5200A or P5205A.

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