Hello All. I have a question for a DC/AC voltage divider.

Why at the voltage range specs they stated AC up to 1KHz sinusoidal?

 

A voltage divider does not convert AC to DC. I suspect that you are talking about a AC adapter.

Specs tell you what a device does under what circumstances. If it says the AC in should be a max of 1KHz. that means it will work up to that frequency with no guarantee of what happens if the frequency is higher.

Bob

 

Thank Bob.

No this is a HV divider. Resistor divider for DC input with ratio 1000:1. So for 100KV input you will have 100 V output to safely connect to an oscilloscope for example.

For AC input (capacitive divider) instead of saying up to 100KV input they have up to 1Khz. I am guessing this limit is due to the caps reactance but I am not sure.

 

hi,
As it is a specialised HV, high ratio divider, it may include some inductive component in its construction, so it will be frequency limited.
E

 

The reason for all of the details about frequency is that it is a very high resistance device, and the capacitance of the assembly is enough to affect the accuracy at higher frequencies. It is the capacitive reactance that will affect the output more as the frequency increases. So that is why there is a frequency limit specified. It will function above those limits but the accuracy will not be as specified.
This is a very basic electrical principle and it is important to understand these very fundamental relationships to see what things mean.

 

This HV probe is built for a meter but I also have some for scopes. Inside the probe there are resistors that divide the voltage by 1000:1. At the input to the meter and of the scope there is a capacitor. The Rs and C form a RC filter that removes high frequencies. In your case they think that AC readings above 1khz are not accurate.

The capacitors in the cables and in the meter short out high frequencies.