Author Topic: Yet another fast edge pulse generator  (Read 28483 times)

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Offline capt bullshot

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Re: Yet another fast edge pulse generator
« Reply #100 on: July 22, 2017, 09:39:13 PM »
Today mine arrived. I guess my TDS580 wins the prize for the most ringing display
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #101 on: July 23, 2017, 05:24:24 AM »
Your pulse generator arrived today in Germany, thanks for the fast shipment.

One question.
When I run your software on my PC, (Win7), I get weird selection numbers for the voltage selection.
Is it the software or anything I am missing?
See attachments
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Offline Leo Bodnar

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Re: Yet another fast edge pulse generator
« Reply #102 on: July 23, 2017, 05:28:34 AM »
Your pulse generator arrived today in Germany, thanks for the fast shipment.

One question.
When I run your software on my PC, (Win7), I get weird selection numbers for the voltage selection.
Is it the software or anything I am missing?
See attachments
It looks like a decimal dot/comma confusion. 
Temporary bugfix: for now assume it is in microvolts :D
I will try to change my locale and see if I can replicate and fix this.
Leo

Offline Berni

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Re: Yet another fast edge pulse generator
« Reply #103 on: July 23, 2017, 05:44:34 AM »
Aww so it doesn't have a secret 2kV output range in select European places? Would be pretty impressive with that rise time. ;D

I'm on vacation so Il know if I got mine once I get back home.
 

Online rx8pilot

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Re: Yet another fast edge pulse generator
« Reply #104 on: July 23, 2017, 06:50:38 AM »
Today mine arrived. I guess my TDS580 wins the prize for the most ringing display

It will be interesting to learn what contributes to the different responses seen on various scopes.
Thank you EEVBlog for all the support in the Keysight Test to Impress Giveaway voting!
 

Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #105 on: July 23, 2017, 07:21:02 AM »
OK, I will wait for you to figure out the decimal point.

Here are my measurements on my slowest scope.
This is an Agilent branded DSO-X-2002A, 70 MHz

« Last Edit: July 23, 2017, 10:07:15 PM by HighVoltage »
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #106 on: July 23, 2017, 09:50:17 PM »
OK, tested on my Agilent MSO-X-3104A, 1 GHz scope

Rise time 440 ps

The software is running on an older XP
This time I get good numbers like 1000 but if I select a different number, like 1400, the signal is not changing at all.
« Last Edit: July 23, 2017, 10:09:50 PM by HighVoltage »
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #107 on: July 23, 2017, 10:06:06 PM »
Now tested on my Agilent MSO 7045B 500 MHz scope

Rise Time 1.03 ns
No overshoot, may be the scope is too slow!

This time Software running on a Lenovo Laptop with Win7 Pro and all works as expected
« Last Edit: July 23, 2017, 10:07:52 PM by HighVoltage »
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Offline Leo Bodnar

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Re: Yet another fast edge pulse generator
« Reply #108 on: July 23, 2017, 10:08:34 PM »
Now tested on my Agilent MSO 7045B 500 MHz scope
Rise Time 1.03 ns
No overshoot, may be the scope is too slow!
Don't forget to terminate input to 50R if you want fastest and cleanest risetime.
Leo

Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #109 on: July 23, 2017, 10:21:24 PM »
Now my last scope for this test, a Keysight MSO-X-6004A, 6 GHz, 50 Ohm
Rise time is 88 ps
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #110 on: July 23, 2017, 10:43:57 PM »
Now tested on my Agilent MSO 7045B 500 MHz scope
Rise Time 1.03 ns
No overshoot, may be the scope is too slow!
Don't forget to terminate input to 50R if you want fastest and cleanest risetime.
Leo

You are right, I forgot the 50 Ohm setting.
Here again the same scope, 50 Ohm turned ON
Rise time 630 ps
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #111 on: July 23, 2017, 10:52:31 PM »
Just for fun I tested your pulse generator on a 20 year old Fluke PM3394B, 200 MHz
50 Ohm input
1.84 ns rise time


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Offline Leo Bodnar

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Re: Yet another fast edge pulse generator
« Reply #112 on: July 23, 2017, 11:07:19 PM »
Now my last scope for this test, a Keysight MSO-X-6004A, 6 GHz, 50 Ohm
Rise time is 88 ps
Assuming total system risetime Tsystem2 = Tscope2 + Tpulser2
It checks out reasonably well:
Tsystem = 88ps, Tpulser = 50ps
From there Tscope = 72ps
MSO-X-6004A specification lists 75ps risetime.

Pleasant UI on that Fluke.
« Last Edit: July 23, 2017, 11:14:20 PM by Leo Bodnar »
 

Offline Berni

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Re: Yet another fast edge pulse generator
« Reply #113 on: July 24, 2017, 02:45:32 AM »
Neat to see some CROs join in even if they are hybrids.

Oh and do all your scopes have names like that?
 

Offline capt bullshot

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Re: Yet another fast edge pulse generator
« Reply #114 on: July 24, 2017, 10:59:54 PM »
Found some time and tried the Wavewhatever MX104 @work
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #115 on: July 25, 2017, 02:30:26 AM »
Neat to see some CROs join in even if they are hybrids.

Oh and do all your scopes have names like that?

Only on my high voltage bench, Scope-1 to Scope-6 because I am switching the RS232 connection manually to one PC input for data acquisition.
 
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Online WastelandTek

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Re: Yet another fast edge pulse generator
« Reply #116 on: July 25, 2017, 02:48:12 AM »
Found some time and tried the Wavewhatever MX104 @work

now that is pretty
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Online H.O

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Re: Yet another fast edge pulse generator
« Reply #117 on: July 25, 2017, 04:23:48 AM »
Received mine today, thank you Leo!
Here's my Rigol DS4000 series:
 

Offline Gixy

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Re: Yet another fast edge pulse generator
« Reply #118 on: July 25, 2017, 08:18:01 PM »
Hi Leo,
News from order 20535?
 

Offline Leo Bodnar

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Re: Yet another fast edge pulse generator
« Reply #119 on: July 25, 2017, 09:06:46 PM »
Hi Leo,
News from order 20535?
Hi Denis,
Shipped on the 20th of July with Airmail.
Thanks
Leo

Offline TheAmmoniacal

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Re: Yet another fast edge pulse generator
« Reply #120 on: July 25, 2017, 09:22:28 PM »
Mine has arrived, all good. Thanks.

Will have a look at the output on my scopes when I get home from vacation.
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Offline Gixy

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Re: Yet another fast edge pulse generator
« Reply #121 on: July 25, 2017, 09:53:45 PM »
Should be there today hopefully. Thks Leo
 

Offline capt bullshot

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Re: Yet another fast edge pulse generator
« Reply #122 on: July 25, 2017, 11:38:58 PM »
Today we had a demo of some Tek stuff here.
I managed to get screenshots from the new MSO58 2GHz flagship. This has a frickin large screen - with lots of space for ringing. I believe my TDS580 (see somewhere above) isn't that bad in terms of Tek-ringing. I do still like more the clean edge of the LeCroy.
(first two pictures)

Then there was the fabulous fiber optic isolated probe with 500MHz bandwith - the signal looks a bit different (third picture)
Fforgot to adjust the timebase for the rise time display to work, too many people around distracting me.
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Offline HighVoltage

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Re: Yet another fast edge pulse generator
« Reply #123 on: July 26, 2017, 12:40:39 AM »
Do I see this right, the Tektronix 2GHz MSO58 has 213 ps rise time with this 50ps pulse generator ?

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Offline capt bullshot

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Re: Yet another fast edge pulse generator
« Reply #124 on: July 26, 2017, 02:18:11 AM »
Do I see this right, the Tektronix 2GHz MSO58 has 213 ps rise time with this 50ps pulse generator ?

Thtat's what I've seen. The specification (taken from Tek website) is:
Bandwidth (calculated rise time)   350 MHz (1,15 ns), 500 MHz (800 ps), 1 GHz (400 ps), 2 GHz (225 ps)

They must have different frontends for the 2GHz models, since many specs are different between 2GHz and less than 2GHz models.
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