Author Topic: Conversion of 500MHz TDS744A to 1GHz TDS784A  (Read 32643 times)

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Offline David Hess

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #75 on: September 23, 2016, 06:11:31 am »
Speaking of FastFrame... What sort of use case is it for? There's no example in the manual and I never could really think of a situation where it would be useful. (Obviously it is useful, or it wouldn't be a feature!)

It allows capturing only the relevant parts of a signal around the trigger points and usually produces a much higher waveform acquisition rate without the disadvantages of DPO mode.
 

Offline rx8pilot

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #76 on: September 23, 2016, 06:14:10 am »
To my surprise - the voice control on the Keysight scope is an awesome feature that I use all the time. When my hands are delicately trying to probe two tiny points - the voice control can save my ass. Start, stop, scaling, and more. Super handy and works with a normal voice and all the fans on my bench going full blast too. I would give up touch screen before voice control.
Factory400 - the worlds smallest factory. http://www.youtube.com/c/Factory400
 

Offline snoopy

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #77 on: September 23, 2016, 10:01:31 am »

The first one were the 54645A and the 54645D (MSO version of the 54645A).

Can't remember what the waveform rate was for the original but I believe it was somewhere in the 250k wfms/s region. The important bit however was that it was not just one large number at a specific setting (as with InstaVu/DPO), it reached high update rates in almost any setting.

Hmmm - you need to be more specific regarding wfrms/s because when dave reviewed an older HP 54622 (2000 vintage) with MegaZoom it says something about 25 million vectors per second ??? Go to 8:40 where dave tests the actual update rate - a measily 520 wfrms/s at best  :--

« Last Edit: September 23, 2016, 10:10:54 am by snoopy »
 

Online MarkL

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #78 on: September 23, 2016, 12:03:53 pm »
Hmmm - you need to be more specific regarding wfrms/s because when dave reviewed an older HP 54622 (2000 vintage) with MegaZoom it says something about 25 million vectors per second ??? Go to 8:40 where dave tests the actual update rate - a measily 520 wfrms/s at best  :--
Different meaning of vectors; from the 54645A manual:

Quote
Using Vectors

One of the most fundamental choices you must make about your display is whether to draw vectors (connect the dots)  between the samples, or simply let the samples fill in the waveform. To some degree, this is a matter of personal preference, but it also depends on the waveform.

· You will probably operate the oscilloscope most often with vectors on. Having vectors on slows the display of the oscilloscope, thus works better for slower sweep speeds, peak detect, or average displays, and signals with stable triggers.

· Having vectors off works better for fast sweep speeds, normal displays, or unstable triggers. Complex analog signals like video and eye diagrams show more intensity information with vectors off. Turn vectors off when the maximum display rate is required, or when highly complex or multi-valued waveforms are displayed.
 

Offline Daxxin

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #79 on: December 13, 2017, 10:04:46 pm »
Did the modification removing R1064 and 4 caps , but no difference with the banner
 

Offline Jwalling

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #80 on: December 13, 2017, 10:21:58 pm »
Not surprising. R1064 should be installed. The other three should be removed.  ;)
Jay

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Offline Vlad_01

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #81 on: March 09, 2018, 03:08:49 pm »
TDS744  (without "A")
firmware v.1.0e
Options 13, 1F,1M, 2F

All combinations of resistors are tried, no result.
It looks like I should change the firmware.
On what to change and where to look the instruction?
What is the difference between TDS744 and TDS744A?



There were 3 lintels - R1061, R1062 & R1064.
All 16 combinations are checked, no result.

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http://www103.zippyshare.com/v/c8iduaXp/file.html
« Last Edit: March 10, 2018, 10:36:38 am by Vlad_01 »
 


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