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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. :)
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
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.
Registered Member #58118
Joined: Sat Dec 12 2015, 12:34AM
Location: Sanger, Texas
Posts: 14
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.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
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.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
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.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
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.
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.
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Nice Current monitors ($135) on Ebay...
