What is the result of connecting Probe1 and 2 and Reference1 and 2 as shown? Ref

Question

What is the result of connecting Probe1 and 2 and Reference1 and 2 as shown? Ref1 and Ref2 will create a short circuit to earth and pull down the power supply. The currents in Ref1 and Ref2 will be opposing and cancel each other out. Ref1 and Ref2 have created an earth reference between Z2 and Z4. Ref1 and Ref2 will draw current from the circuit and cause the RCD to trip. Ref1 and Ref2 should only ever be connected to the 0V terminal. Ref1 and Ref2 will cause the oscilloscope chassis to float to the power supply voltage.

Explanation / Answer

In the above mention circuitry, there exists a CRO(Cathode Ray Oscilloscope) and an RPS (Regulated Power Supply).

The above shown CRO is a dual trace CRO. We can see from the figure that a 5V supply is given to the circuit between the terminals of Z1 and Z2.

Now let's come to the main case, is there anything wrong by making the reference 1 and reference 2 of channel 1 and channel 2 a short circuit?

Generally, the probes of a channel of a CRO can be considered as the two terminals of a voltmeter. So what does it does? It measures the potential difference between the given terminals(the current through an ideal voltmeter is 0 Amps). So does is the CRO here. For the above circuit. Channel 1 reads the voltage across the impedance Z2 and channel 2 reads the voltage across the impedance Z4 but the reading of channel 2 voltage will be negative because the potential at node Z2 and Z4 is higher than that of Z4 and Z6 node.

In short what the reference terminal does is make the point at which it is connected as the reference voltage and reads the voltage from that potential to the connected probe potential.

therefore the answer would be C. Reference1 and reference2 has created an earth reference between Z2 - Z4.

For any queries please comment below (SP).

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