Billy Mayo
Member
At work I have to test circuit boards
The circuit I'm testing is a servo current amp with also Gates 7400 family
The problem is that when I put my DVM fluke 87 meter on a input or output node of a GATE , it will cause a short
My manager said because the circuit is a current circuit and I'm trying to measure voltage
He said also that the DVM fluke 87 meter has an internal ground that is inside the meter not the black probe going to the circuit boards ground , which is causing the short to the current circuit when probing the logic Gates inputs and outputs
He claims that I have to use a Bench plug in DVM meter and use a 2 prong adapter plug to make the meter floating when testing on current circuits
Is this true? and what does he mean?
I thought a Fluke DVM meter was floating from ground because it ran on batteries and it didn't ground anything
The Logic GATE are very sensitive when probing the inputs, the gate will trips it's output from just a probe , What is causing this type of problem?
Is the Fluke 87 meter causing a parallel High impedance load on the gates input? to trip for output?
My manager said that there is high current ( not really high ) but that a current circuit needs a separate ground or isolated ground, but what kind of DVM meter do I use for this?
The circuit I'm testing is a servo current amp with also Gates 7400 family
The problem is that when I put my DVM fluke 87 meter on a input or output node of a GATE , it will cause a short
My manager said because the circuit is a current circuit and I'm trying to measure voltage
He said also that the DVM fluke 87 meter has an internal ground that is inside the meter not the black probe going to the circuit boards ground , which is causing the short to the current circuit when probing the logic Gates inputs and outputs
He claims that I have to use a Bench plug in DVM meter and use a 2 prong adapter plug to make the meter floating when testing on current circuits
Is this true? and what does he mean?
I thought a Fluke DVM meter was floating from ground because it ran on batteries and it didn't ground anything
The Logic GATE are very sensitive when probing the inputs, the gate will trips it's output from just a probe , What is causing this type of problem?
Is the Fluke 87 meter causing a parallel High impedance load on the gates input? to trip for output?
My manager said that there is high current ( not really high ) but that a current circuit needs a separate ground or isolated ground, but what kind of DVM meter do I use for this?