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4hv.org :: Forums :: Tesla Coils
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Nice Current monitors ($135) on Ebay...

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flyboy7777
Mon Jan 18 2016, 01:25PM Print
flyboy7777 Registered Member #58118 Joined: Sat Dec 12 2015, 12:34AM
Location: Sanger, Texas
Posts: 14
Just picked one of these up on Ebay. Price really isn't bad for the quality it is.
Link2
Electrostatically shielded, BNC connector, etc.
Good up to 500KHz.
L1600
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Mads Barnkob
Tue Jan 19 2016, 08:05AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Do you have any Pearson current monitors to test it up against? Looking at the data sheets for Pearsons 0.001V/A products, this one lands somewhere around the middle at a much reduced frequency range.

From the rating I would be most interested in seeing comparison from high current pulse discharges.
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Thomas W
Wed Jan 20 2016, 07:00PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
I've went ahead and brought one, do a best offer for $110 or lower, I got it accepted immediately at $110
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flyboy7777
Wed Jan 20 2016, 07:00PM
flyboy7777 Registered Member #58118 Joined: Sat Dec 12 2015, 12:34AM
Location: Sanger, Texas
Posts: 14
Unfortunately not. Hopefully I can use this thing a bit and see how it peforms. I'll post my findings.
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flyboy7777
Wed Jan 20 2016, 07:05PM
flyboy7777 Registered Member #58118 Joined: Sat Dec 12 2015, 12:34AM
Location: Sanger, Texas
Posts: 14
If anyone has a Pearson they wouldn't mind lending to me for a few days, I could post side by side results.
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loneoceans
Wed Jan 20 2016, 11:25PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
It was pointed out to me that this was 1mV/A, which means even a large 500A current will only look like 0.5V on a scope! So just something to keep in mind. I can see this being useful for pulse discharges, though!

May I point out that there are other current probes on ebay as well, e.g: Link2 and Link2 which might be more useful? Data here: Link2
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flyboy7777
Sat Jan 23 2016, 01:01AM
flyboy7777 Registered Member #58118 Joined: Sat Dec 12 2015, 12:34AM
Location: Sanger, Texas
Posts: 14
I had actually thought about buying the one that's .01V/A before I got this one, but that would limit me to 1000 amps maximum with my scope... Unless I build or buy a /10 adapter. (Assuming my math is correct)
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Mads Barnkob
Sat Jan 23 2016, 08:45AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
flyboy7777 wrote ...

I had actually thought about buying the one that's .01V/A before I got this one, but that would limit me to 1000 amps maximum with my scope... Unless I build or buy a /10 adapter. (Assuming my math is correct)

I bought one of the IPC 1mV/A, I will do some testing against my Pearson current monitors, despite they do not have quite the same ratings. I only bought this for pulse discharge measurements and he accepted 100$ offer because I described the high import taxes :)

A while back I bought two old Kay attenuators for exactly reducing signal strength by a adjustable ratio. A Kay 432D (0-101db) and a 1/432 (0-22.1db). Got both at 48 Euro.
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loneoceans
Sat Jan 23 2016, 05:18PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
flyboy7777 wrote ...

I had actually thought about buying the one that's .01V/A before I got this one, but that would limit me to 1000 amps maximum with my scope... Unless I build or buy a /10 adapter. (Assuming my math is correct)

Hm for 10mV/A, that's just 10V at 1kA. How would that limit you to 1000A max? And if so, how would you use the scope to measure anything else (coil related, like gate voltages?)
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Thomas W
Sat Jan 23 2016, 08:14PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
loneoceans wrote ...

flyboy7777 wrote ...

I had actually thought about buying the one that's .01V/A before I got this one, but that would limit me to 1000 amps maximum with my scope... Unless I build or buy a /10 adapter. (Assuming my math is correct)

Hm for 10mV/A, that's just 10V at 1kA. How would that limit you to 1000A max? And if so, how would you use the scope to measure anything else (coil related, like gate voltages?)

Into a 50 Ohm load, often oscilloscopes will limit your voltage for a 50 Ohm load, for example my LeCroy scope only allows up to 5V @ 50Ohm input.
unless you use an external 50Ohm load, of course. I believe that's what Flyboy was referring too.
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