amp probe question

[qcrob]

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.

 

[Jerry G.]

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.
====

On Feb 7, 6:01 pm, qcrob <rob.c.armstr...@gmail.com> wrote:

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.

 

[qcrob]

Thanks for the reply.
Any suggestions on where to look for such a remote monitor?
I am trying to measure DC welding amperage around 200 amps and voltage
around 30 volts.

On Feb 7, 8:09 pm, "Jerry G." <jerry...@hotmail.com> wrote:

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.
====
On Feb 7, 6:01 pm,qcrob<rob.c.armstr...@gmail.com> wrote:



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.- Hide quoted text -

- Show quoted text -

 

[JeffM]

qcrob wrote:

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?

You are planning to put the burden down at the *meter* end. Right?

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.

The classic voltage comparator?

http://www.google.com/images?q=voltage-comparator+schematic+-digital

 

[qcrob]

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.

 

[JeffM]

qcrob wrote:

Perhaps it would help if I give a better explanation of my situation
[the rest unread by me]

Perhap is would help if you learned how to use paragraph breaks.