Nice Current monitors ($135) on Ebay...
flyboy7777, Mon Jan 18 2016, 01:25PMJust picked one of these up on Ebay. Price really isn't bad for the quality it is.
Electrostatically shielded, BNC connector, etc.
Good up to 500KHz.
Re: Nice Current monitors ($135) on Ebay...
Mads Barnkob, Tue Jan 19 2016, 08:05AM
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.
Mads Barnkob, Tue Jan 19 2016, 08:05AM
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.
Re: Nice Current monitors ($135) on Ebay...
Thomas W, Wed Jan 20 2016, 07:00PM
I've went ahead and brought one, do a best offer for $110 or lower, I got it accepted immediately at $110
Thomas W, Wed Jan 20 2016, 07:00PM
I've went ahead and brought one, do a best offer for $110 or lower, I got it accepted immediately at $110
Re: Nice Current monitors ($135) on Ebay...
flyboy7777, Wed Jan 20 2016, 07:00PM
Unfortunately not. Hopefully I can use this thing a bit and see how it peforms. I'll post my findings.
flyboy7777, Wed Jan 20 2016, 07:00PM
Unfortunately not. Hopefully I can use this thing a bit and see how it peforms. I'll post my findings.
Re: Nice Current monitors ($135) on Ebay...
flyboy7777, Wed Jan 20 2016, 07:05PM
If anyone has a Pearson they wouldn't mind lending to me for a few days, I could post side by side results.
flyboy7777, Wed Jan 20 2016, 07:05PM
If anyone has a Pearson they wouldn't mind lending to me for a few days, I could post side by side results.
Re: Nice Current monitors ($135) on Ebay...
loneoceans, Wed Jan 20 2016, 11:25PM
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: and which might be more useful? Data here:
loneoceans, Wed Jan 20 2016, 11:25PM
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:
and which might be more useful? Data here: Re: Nice Current monitors ($135) on Ebay...
flyboy7777, Sat Jan 23 2016, 01:01AM
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)
flyboy7777, Sat Jan 23 2016, 01:01AM
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)
Re: Nice Current monitors ($135) on Ebay...
Mads Barnkob, Sat Jan 23 2016, 08:45AM
I bought one of the IPC 1mV/A, I will do some testing against my Pearson current monitors, despite they do not have quite the same ratings. I only bought this for pulse discharge measurements and he accepted 100$ 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.
Mads Barnkob, Sat Jan 23 2016, 08:45AM
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 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.
Re: Nice Current monitors ($135) on Ebay...
loneoceans, Sat Jan 23 2016, 05:18PM
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?)
loneoceans, Sat Jan 23 2016, 05:18PM
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 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?)
Re: Nice Current monitors ($135) on Ebay...
Thomas W, Sat Jan 23 2016, 08:14PM
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.
Thomas W, Sat Jan 23 2016, 08:14PM
loneoceans wrote ...
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?)
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 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.
Re: Nice Current monitors ($135) on Ebay...
loneoceans, Sat Jan 23 2016, 10:08PM
Sure I'd use a common 50 ohm input adapter on the scope - I think most lower end scopes are just high impedance inputs - but just pointing out that a 10mV/A resolution would probably be much more useful than 1mV/A for regular coiling use. :)
loneoceans, Sat Jan 23 2016, 10:08PM
Thomas W wrote ...
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.
loneoceans wrote ...
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?)
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 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.
Sure I'd use a common 50 ohm input adapter on the scope - I think most lower end scopes are just high impedance inputs - but just pointing out that a 10mV/A resolution would probably be much more useful than 1mV/A for regular coiling use. :)
Re: Nice Current monitors ($135) on Ebay...
Signification, Mon Jan 25 2016, 12:33AM
I have one I picked up from some auction long ago. It is rated only 0.1 V/A made by: Gauss Control, Inc. Also printed on it...
#855
C829154-B
NOV 12 1975
Mountain View, Ca.
Come to think of it, I do believe I posted a PIC on this forum a while back.
Signification, Mon Jan 25 2016, 12:33AM
I have one I picked up from some auction long ago. It is rated only 0.1 V/A made by: Gauss Control, Inc. Also printed on it...
#855
C829154-B
NOV 12 1975
Mountain View, Ca.
Come to think of it, I do believe I posted a PIC on this forum a while back.
Re: Nice Current monitors ($135) on Ebay...
flyboy7777, Mon Jan 25 2016, 02:34PM
Yes, my scope is only good for 10volts (20v P-P) input unless I use an attenuator on it. I use a 10x probe when I need to measure something larger than that.
Jonathan
flyboy7777, Mon Jan 25 2016, 02:34PM
Yes, my scope is only good for 10volts (20v P-P) input unless I use an attenuator on it. I use a 10x probe when I need to measure something larger than that.
Jonathan
Re: Nice Current monitors ($135) on Ebay...
Kizmo, Thu Feb 04 2016, 10:04AM
I got mine today :)
Will give it a test next weekend
Kizmo, Thu Feb 04 2016, 10:04AM
I got mine today :)
Will give it a test next weekend
Re: Nice Current monitors ($135) on Ebay...
Mads Barnkob, Thu Feb 04 2016, 04:23PM
Oh cool, I also got a mouse
edit:
Some quick testing with my small MOC bank
I put 3 current monitors in a row on the discharge cable and set it up for Pearson model 110 (0.1V/A) with -40db attenuation, Pearson model 101 (0.01V/A) with -20db attenuation and IPC CM-01-S (0.001V/A) straight through.
I just realized that I made a stupid mistake, measuring a 20kA pulse with a 5kA rated monitor is not good. Hopefully that is right at its outer internal components limits/isolation.
Despite being a 1mV/A current monitor, a attenuator is still needed for pulses over 40kA, at least for my DS1054Z scope. A much wider test is needed to determine its lower and upper limits against the much more expensive Pearsons, but I am satisfied with that almost matching result for this one-shot.
Mads Barnkob, Thu Feb 04 2016, 04:23PM
Oh cool, I also got a mouse
edit:
Some quick testing with my small MOC bank
I put 3 current monitors in a row on the discharge cable and set it up for Pearson model 110 (0.1V/A) with -40db attenuation, Pearson model 101 (0.01V/A) with -20db attenuation and IPC CM-01-S (0.001V/A) straight through.
I just realized that I made a stupid mistake, measuring a 20kA pulse with a 5kA rated monitor is not good. Hopefully that is right at its outer internal components limits/isolation.
Despite being a 1mV/A current monitor, a attenuator is still needed for pulses over 40kA, at least for my DS1054Z scope. A much wider test is needed to determine its lower and upper limits against the much more expensive Pearsons, but I am satisfied with that almost matching result for this one-shot.
Re: Nice Current monitors ($135) on Ebay...
flyboy7777, Sun Feb 07 2016, 04:08AM
Yeah, they all look pretty darn close. I'm still curious how it will perform for DRSSTC testing.
flyboy7777, Sun Feb 07 2016, 04:08AM
Yeah, they all look pretty darn close. I'm still curious how it will perform for DRSSTC testing.
Re: Nice Current monitors ($135) on Ebay...
Goodchild, Fri Feb 19 2016, 02:38PM
So I also picked one of these up out of curiosity.
What I found was lacking (other than bandwidth) was shielding and the style of termination. The first clue to me that the shielding was lacking is the difference in weight, a person 101 (which I also have) weighs in at almost twice as heavy, while being about the same size.
I also tested them side by side on a DRSSTC pushing about 1Kw. The yellow guy was showing considerable noise from the switching transitions of the nearby bridge, while the pearson 101 was nice and clean. This is impressive for the 101 considering it has a much higher bandwidth and is capable of seeing much higher frequency noise.
Goodchild, Fri Feb 19 2016, 02:38PM
So I also picked one of these up out of curiosity.
What I found was lacking (other than bandwidth) was shielding and the style of termination. The first clue to me that the shielding was lacking is the difference in weight, a person 101 (which I also have) weighs in at almost twice as heavy, while being about the same size.
I also tested them side by side on a DRSSTC pushing about 1Kw. The yellow guy was showing considerable noise from the switching transitions of the nearby bridge, while the pearson 101 was nice and clean. This is impressive for the 101 considering it has a much higher bandwidth and is capable of seeing much higher frequency noise.
Re: Nice Current monitors ($135) on Ebay...
Mads Barnkob, Sat Feb 20 2016, 08:27PM
I suspected the IPC just being shielded from aluminium, atleast the bracket holes and weldinds give that away.
The "window" in the Pearson's are merely a 1 mm slot in the shielding. I got no idea about IPC.
Pearson uses distributed load resistors along the winding of the CT, so for lefts say every 5% of the coil, a 1.xOhm resistors sits across it. I butchered a model 1330, it is fact :)
There is no doubt a difference in price/quality/precision.
Mads Barnkob, Sat Feb 20 2016, 08:27PM
Goodchild wrote ...
So I also picked one of these up out of curiosity.
What I found was lacking (other than bandwidth) was shielding and the style of termination. The first clue to me that the shielding was lacking is the difference in weight, a person 101 (which I also have) weighs in at almost twice as heavy, while being about the same size.
I also tested them side by side on a DRSSTC pushing about 1Kw. The yellow guy was showing considerable noise from the switching transitions of the nearby bridge, while the pearson 101 was nice and clean. This is impressive for the 101 considering it has a much higher bandwidth and is capable of seeing much higher frequency noise.
So I also picked one of these up out of curiosity.
What I found was lacking (other than bandwidth) was shielding and the style of termination. The first clue to me that the shielding was lacking is the difference in weight, a person 101 (which I also have) weighs in at almost twice as heavy, while being about the same size.
I also tested them side by side on a DRSSTC pushing about 1Kw. The yellow guy was showing considerable noise from the switching transitions of the nearby bridge, while the pearson 101 was nice and clean. This is impressive for the 101 considering it has a much higher bandwidth and is capable of seeing much higher frequency noise.
I suspected the IPC just being shielded from aluminium, atleast the bracket holes and weldinds give that away.
The "window" in the Pearson's are merely a 1 mm slot in the shielding. I got no idea about IPC.
Pearson uses distributed load resistors along the winding of the CT, so for lefts say every 5% of the coil, a 1.xOhm resistors sits across it. I butchered a model 1330, it is fact :)
There is no doubt a difference in price/quality/precision.
Print this page