Author Topic: Conversion of 500MHz TDS744A to 1GHz TDS784A  (Read 51305 times)

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Offline nctnico

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #100 on: December 18, 2019, 02:03:56 pm »
You can attach some switches and just try every combination. Perhaps you need a different combination. It is also possible that a monochrome display (I assume the TDS540C has a monochrome display) isn't supported so there is no known model number for your configuration.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Galen

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #101 on: December 20, 2019, 06:31:48 am »
Thanks nctnico. I will need a few days to try this as time tied up these days.
The TDS580C published with the FW5.2 as stated in the tek document, so maybe the FW5.0 doesn't have the ID code for TDS580C.
But anyway, I will have a try.
Delighted when problem fixed
 

Offline Alfons

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #102 on: December 27, 2019, 03:49:49 pm »
Here is a plot that shows the frequency response of my Tek744A-784A.
The device triggers cleanly up to over 1.5GHz, the signal also looks quite good, but the frequency response is already absolutely in the basement. The -3dBm is pretty close to 1GHz. The device is not calibrated. First Picture shows 1.5GHz in ET-Sampling, last Pikture shows 1.5GHz in Real-Time-Sampling.

« Last Edit: December 27, 2019, 04:34:24 pm by Alfons »
 
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Offline Galen

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #103 on: January 07, 2020, 05:52:53 am »
Thanks nctnico. I will need a few days to try this as time tied up these days.
The TDS580C published with the FW5.2 as stated in the tek document, so maybe the FW5.0 doesn't have the ID code for TDS580C.
But anyway, I will have a try.
After I upgraded the firmware, the banner shows 'TDS580C'.  so shorting R1064 is right for TDS580C.
Delighted when problem fixed
 
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Offline Galen

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #104 on: January 11, 2020, 05:06:42 am »
Has anybody tried TDS520C or 724C upgrade?
Delighted when problem fixed
 

Offline madao

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #105 on: January 11, 2020, 07:15:53 am »
2 ch and 1 Ghz exists, but only color display model. It is called as  TDS782.   (Firmware 5.2e support also  TDS782C. )

I have a   TDS724C aquisition board as good spare part, but i wouldn't try, it is not worth.

« Last Edit: January 11, 2020, 07:20:40 am by madao »
 

Offline Galen

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #106 on: January 11, 2020, 11:57:50 am »
Thanks Matt.  I may try it someday.  but not now.
Delighted when problem fixed
 

Offline olle

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #107 on: June 04, 2020, 09:04:56 am »
Since I just noted that one of the (TDS754/784/...) acquisition board resistor configurations sets the scope to be a TDS794 (2 GHz BW on 1 channel), I wonder if anyone has tried that one out, and if so - did it work or brick the unit?

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Offline Jay_Diddy_B

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #108 on: June 04, 2020, 12:09:31 pm »
Olle and the group,

Welcome to the forum!!

I have just been checking the specification of the TDS794x family, The 794 is 50 \$\Omega\$ only, which means it, (almost certainly) has different input section to the other 700 series family.

I have not seen the inside of the 794 so I don't know for certain.

Regards,
Jay_Diddy_B
 

Offline olle

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Re: Conversion of 500MHz TDS744A to 1GHz TDS784A
« Reply #109 on: June 04, 2020, 12:28:32 pm »
Thanks a lot for that piece of enlightenment. It means that I'll stay with my 754C-to-784C conversion for now.

 :D

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