I am purchasing a Greenlee CMA-60 AC/DC Clamp-on Current Adapter and would like to extend the wire leads to my millivolt meter by 25 meters, think this would give me inaccurate readings? I would also like to know if anyone has an ideas on how I could have an audio beep to let me know when anything above zero millivolts is being read. Thanks.
These meters are internaly high impedanced on their signal input side. You can try using shielded wires, but since the meter must be floating ground, you may still have noise problems. Noise can cause some random variations in the readings.
What you should do is look in to meter systems that can use remote monitoring. This would be of a much more reliable solution.
Jerry G. =3D=3D=3D=3D=3D
You are planning to put the burden down at the *meter* end. Right?
The classic voltage comparator?
Perhaps it would help if I give a better explanation of my situation and what I am trying to accomplish as I have a very limited knowledge of electronics. I have to record the voltage, amperage and time durations during welding operations. I have been doing this by using a stop watch, a voltage meter, and a clamp on amp meter. This has been working fine until we get into cold weather conditions and the LCD on the meters freeze up. I simply connect the voltage leads on the welding machine and assume a voltage drop for the length of welding cable on that specific welder, and record the average readings. For the amperage, I use a basic clamp on amp probe anywhere on the positive or negative cable, and record the average readings. The voltage generally runs between 80 volts open circuit to 18-35 when welding is taking place. Amperage runs from around 0 to 120-250 welding is taking place. For both the amperage and voltage the reading bounce up and down quite a bit, but I am only looking for an approximate average anyway. The time duration is generaly weld for 70 seconds stop for 3 to 100 seconds and repeat, that is why I would like an audio signal when amperage approches zero. I am hoping to find a way to put the instruments (or some sort of data logger) in a warm vehicle with me to avoid freezing of the LCDs. I would like to add 25 meter extensions to the voltage lead wires and use the current adapter with 25 meter extension leads that will run to a separate meter to record millivolts that I can convert to an amperage reading. I really like the suggestion of using meters that have the ability of remote monitoring but dont know which brand/model or where to get them. The schematic of the classic voltage comparitor may be a bit over my head as I would just like to get an off the shelf item rather than have one made for me. I greatly appreciate any help given and hope for further suggestions.
Perhap is would help if you learned how to use paragraph breaks.
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