Tektronix P6015A probe with a P6015 compensation box? / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

Tektronix P6015A probe with a P6015 compensation box?

previous 1 2 3 next

Move Thread

LAN_403

Patrick

Mon Jan 02 2017, 05:52AM

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.

Physikfan

Mon Jan 09 2017, 01:56PM

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
TekP60159

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.

Sulaiman

Mon Jan 09 2017, 06:33PM

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.

Physikfan

Mon Jan 09 2017, 08:12PM

Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304

Hi Sulaiman

A quick answer:

For the P6015 the R4 (100k) and
for the P6015A the R8 (100k)
are determining the 1000:1 ratio
with the R100 (100M).

Patrick

Mon Jan 09 2017, 09:27PM

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.

Physikfan

Tue Jan 17 2017, 03:08PM

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.

Patrick

Tue Jan 17 2017, 05:10PM

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.

Physikfan

Wed Jan 25 2017, 03:59PM

Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304

Hi Patrick, Sulaiman and Mads Barnkob

Here are the first measurements with a 40 V square wave, 1 kHz, 1,5 us rise time, Tek calibration output of
Oscilloscope Tek 7904, 2 x 7A11

1. P6015 probe with P6015 box:
P60151kHz400x382

2. P6015A probe with P6015A box
P6015A1kHz400x421

3. P6015A probe with P6015 box
P11904781kHz400x430

I am looking forward to your comments.

johnf

Wed Jan 25 2017, 06:13PM

Registered Member #230 Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284

Yes but did you adjust the presets when you changed the probe box arrangements

Physikfan

Wed Jan 25 2017, 06:52PM

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:
P6015300nszweite400x388

2. P6015A probe with P6015A box
P6015A300ns400x438

3. P6015A probe with P6015 box
P1190475300ns400x409

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.

I am looking forward to your comments.

previous 1 2 3 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob