Really hope I articulate this properly!
I have a piece of equipment to which an earth connected to its input. This earth has a resistance which is variable. i.e there may be 50 ohm to 500 ohm resistance between the input and earth. So, measuring at the input there would be a resistance between it and the earth.
What I want to achieve is to be able to make a black box which sits between the earth and my equipment and allows me to convert the resistance ‘on the fly’.
So, for example I know that for a certain case the input will be between 50 and 500 ohms but I want to convert this to being 90 and 900 ohms at the equipment. Each 50 ohms difference on the input of the black box will result in a 90 ohm change on the output to the equipment.
I ideally want this to be something I can change fairly easily. Ideally by dip switches although I suspect that as I don’t know how many combinations there will be this isn’t feasible. So, in addition to what the circuit will look like I guess what are the options for dictating how flexible this can be? Can it be programmable, which would be perfect! If not maybe can I change the input/output ranges with a single change of component?
I suspect I will have to set limits for both the input and output ranges. Is this something that can be accomplished by a knowledgeable novice!
Any help much appreciated!
Paul
I have a piece of equipment to which an earth connected to its input. This earth has a resistance which is variable. i.e there may be 50 ohm to 500 ohm resistance between the input and earth. So, measuring at the input there would be a resistance between it and the earth.
What I want to achieve is to be able to make a black box which sits between the earth and my equipment and allows me to convert the resistance ‘on the fly’.
So, for example I know that for a certain case the input will be between 50 and 500 ohms but I want to convert this to being 90 and 900 ohms at the equipment. Each 50 ohms difference on the input of the black box will result in a 90 ohm change on the output to the equipment.
I ideally want this to be something I can change fairly easily. Ideally by dip switches although I suspect that as I don’t know how many combinations there will be this isn’t feasible. So, in addition to what the circuit will look like I guess what are the options for dictating how flexible this can be? Can it be programmable, which would be perfect! If not maybe can I change the input/output ranges with a single change of component?
I suspect I will have to set limits for both the input and output ranges. Is this something that can be accomplished by a knowledgeable novice!
Any help much appreciated!
Paul