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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Sulaiman wrote ...
I'm fairly certain that the P6015A used a CFC 'freon' which came under the ozone depleting category, so was discontinued.
Maybe that was it instead of SF6, but as you and I have discussed they got rid of it, and rolled out the P6015A. with the only difference seeming to be the oil.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hallo Patrick, Sulaiman and Mads Barnkob
The two compensating boxes are different:
P6015
P6015A
Please, are there some comments?
Experiments with the following combinations 1. P6015 probe with a P6015 box 2. P6015A probe with a P6015A box 3. P6015A probe with a P6015 box measuring a 100V square-wave pulse are in preparation.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
As the waveforms from my P6015 look about right, I've never twiddled the compensation controls so the following is guesswork;
. a lot of the compensation network is to nullify the effect of the low impedance cable between the high impedance probe and scope . have you noticed how a 100 MOhm resistor into a 1 MOhm 'scope gives 1000:1 ratio ?
I would do exactly what you are doing, use the probe and box that you have and hope for the best, if you can eliminate slow rise- and fall-time, ringing, sag ... etc. when compared to a known good 'scope probe the exact division ratio is not so important, you can just scale the reading by a constant factor, at least you will be able to see the actual waveforms.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I think you'll find my threads here on the forum will give you the answers you want, and a better device. Then look at the NorthStar HV probes.
Also, what are you wanting to measure ? You may not need a super high band width, I found my flybacks have a surprisingly easy to measure output.
The only reason you need to understand their compensation circuit is because of how they choose to build the HV section. If you figure out your own HV "top-end", its much simpler. My compensation circuit only has a single variable capacitor. I have that circuit posted too.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick, Sulaiman and Mads Barnkob
For these experiments with the combinations
1. P6015 probe with P6015 box 2. P6015A probe with P6015A box 3. P6015A probe with P6015 box
I would like to use either the Tektronix pulse generator 106 with 120 V amplitude and rise times of 100 ns or the Tektronix PG 506 with 60 V amplitude and rise times of also 100ns.
Does anyone have any better suggestions?
Ad. Patrick
I have read your very interesting stuff of 2010 and 2011.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Physikfan wrote ...
I would like to use either the Tektronix pulse generator 106 with 120 V amplitude and rise times of 100 ns or the Tektronix PG 506 with 60 V amplitude and rise times of also 100ns.
Does anyone have any better suggestions?
Ad. Patrick
I have read your very interesting stuff of 2010 and 2011.
I didnt know such pulse generators existed, but yes use them see what happens. Next ill see if i can find more info from those years I didnt publish. honestly i think you can build better probes with HV resistors for your purposes depending on your application and need.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick, Sulaiman, Mads Barnkob and johnf
No, I have checked three different combinations:
1. a pure P6015 probe and box 2. a pure P6015A probe and box and 3. a separate P6015A probe with a separate P6015 compensating box.
It is important for me to be able to use these combinations at different locations.
Here are other measurements with a 60 V square wave, 300ns rise time, Tek PG506 calibration unit, oscilloscope Tek 7904, 2 x 7A11.
1. P6015 probe with P6015 box:
2. P6015A probe with P6015A box
3. P6015A probe with P6015 box
I think that according to the fast rise time of these square pulses you cannot get the ratio of 1000:1. My next step will be to try to raise the voltage dividing ratio.
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