Recent content by emlombardo

I thought this was a stupid question but I am glad I asked. It is a fascinating topic and I would have liked to evaluate it more while I still had access to my university lab. Thanks for the help everyone!

Xez: The idea of only powering the transducer when sampling is a good one that I had not thought about. However, the circuit is analog and connected to an analog meter. It was designed in 1977 and the transducer replacement is the first change to the electrical system. Also, if I made any...

@NoTime: Testing the entire device would be ideal and a very practical solution but their testing is done on each individual resistor in the circuit, not on the circuit as a whole. This means that the entire 12V from the batteries will be placed across each resistor for the testing.

I know that they are axial leaded resistors. I think that they are mounted to a PCB inside of the case but I can't get that info from the manufacturer. If I remember correctly, the testing is done with the element covered in coal dust and if it smolders, it fails. If I am thinking of the...

The problem is that the resistors are part of a strain gauge bridge inside of a welded pressure transducer. I have the resistance values but the samples were sent direct to MSHA so I can't take any actual measurements. We did not manufacture the transducer and the manufacturer is actually the...

I am working on getting an MSHA approval for a device and I would like to estimate what the surface temperature of a resistor will be over time. Is there a way to calculate the surface temperature (temp change per unit time perhaps) of a known resistor if a simple DC voltage is applied...

I am not familiar with that type of circuit. I was hoping someone with some more electronics experience would check it for accuracy. Are you sure that all of the circuit junctions are correct? Also, are the characteristics of the model components that you selected comparable to their...

What type of circuit are you trying to model? You could post a screen capture of the circuit and the results if you like.

I have not done this specifically before but I might still be able to help you. I apologize if I am over-simplifying your problem. I am assuming that you are looking for a "Transfer Characteristic" for your circuit. I am also assuming that you have defined input and output nodes of your...

Configure your simulation as either a DC or parametric sweep. After running the simulation you should be able to add a trace with the output node voltage divided by the input node voltage.

Thats good news. I wonder why it wasn't there?

I confirmed that you do need the full part name (D1N3940). Your output file seems to be missing the model parameters. You can right click on the part in Capture and click on EDIT PSPICE MODEL. You should have something that looks like this: .MODEL D1N3940 D( + IS = 4E-10 +...