grep
01-05-2002, 07:52 PM
to measure voltage you place the leads in parallel with the load.
to measure current you place the leads in series with the load.
doing either is inconvienent because there are no exposed points to make the measurements at. I have been thinking of making adapters to plug into the existing connectors then into the existing loads so that I can make measurements with a typical multimeter. I can find adapter plugs both male and female for the molex connectors for the disk drive power cables easily. Finding adapters for the motherboard is the problem. I need a source for the motherboard power connectors and the auxiliary power connectors. Actually I need 2 of each male and female, I will set one up for voltage measurement and the other up for current measurement, unless I can figure out a good way to do both with a single adapter.
The second problem is the 3.3 and 5 volt lines can carry up to 50 amps. I need to figure out how to measure up to 50 amps with a 2 amp maximum meter.
One more observation. The 5 volt line is not a single line on my system its actually 6 lines, combined they can carry up to 50 amps but I am going to assume that no single line will ever actually carry 50 amps. There is no way to forsee how much current any wire will carry, but I can hook up the adapter and then use the multimeter and if there is more current than the meter can measure, I can double the wire and each new wire in parallel will carry 1/2 the current I can keep doubling the wires untill the current drops to a level I can measure.
Grep
to measure current you place the leads in series with the load.
doing either is inconvienent because there are no exposed points to make the measurements at. I have been thinking of making adapters to plug into the existing connectors then into the existing loads so that I can make measurements with a typical multimeter. I can find adapter plugs both male and female for the molex connectors for the disk drive power cables easily. Finding adapters for the motherboard is the problem. I need a source for the motherboard power connectors and the auxiliary power connectors. Actually I need 2 of each male and female, I will set one up for voltage measurement and the other up for current measurement, unless I can figure out a good way to do both with a single adapter.
The second problem is the 3.3 and 5 volt lines can carry up to 50 amps. I need to figure out how to measure up to 50 amps with a 2 amp maximum meter.
One more observation. The 5 volt line is not a single line on my system its actually 6 lines, combined they can carry up to 50 amps but I am going to assume that no single line will ever actually carry 50 amps. There is no way to forsee how much current any wire will carry, but I can hook up the adapter and then use the multimeter and if there is more current than the meter can measure, I can double the wire and each new wire in parallel will carry 1/2 the current I can keep doubling the wires untill the current drops to a level I can measure.
Grep