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Conversion of 500MHz TDS744A to 1GHz TDS784A

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Jay_Diddy_B:

--- Quote from: tford on January 19, 2016, 08:06:46 pm ---I would like to capture my TDS744A scope screen display image and store it on my computer for reference. What is the TDS7xx hardware/software setup you all are using to post these perfect scope screen images?
Thanks, Tom

--- End quote ---

The images were made by printing or plotting to the floppy drive in the scope.

You have to configure the plotting in the 'UTILITY' menu and then plot with the HARDCOPY key.

Regards,

Jay_Diddy_B

tford:
Got it. I'll likely have to purchase a USB 3.5" floppy disk drive for my PC, only about $15. I was hoping to use the rear scope centronics or serial connector and go directly into my PC, but those options are limited. 
Thanks,
Tom

Jwalling:

--- Quote from: tford on January 20, 2016, 11:35:13 pm ---Got it. I'll likely have to purchase a USB 3.5" floppy disk drive for my PC, only about $15. I was hoping to use the rear scope centronics or serial connector and go directly into my PC, but those options are limited. 
Thanks,
Tom

--- End quote ---

You can use the GPIB interface if you use John Miles' excellent 7470 plotter.
http://www.ke5fx.com/gpib/7470.htm

Jay

cncjerry:
Get the plotting software mentioned earlier from John Miles, www.ke5fx.com.

Also, I am starting to think the distortion we discussed a while back was caused by the poster's scope seeing the 2nd harmonic, or some of it, in 4Gsps mode and not in 2Gsps mode.

Jwalling:

--- Quote from: Jay_Diddy_B on December 15, 2014, 02:27:05 am ---Continuation ...

Having modified the hardware I used the Tektronix Field Adjustment software to calibrate the scope. The software calls for the use of a SG504 levelled signal generator. I don't have one of these. I used an Agilent E4425B RF Generator and very high quality cable. I found I had to increase the generator output by 5% when the software called for frequencies higher than 500 MHz to compensate for losses in the cable.

After a couple of false starts I was able to calibrate the scope.

[images snipped]

It looks like a successful conversion  :D :D :D

Enjoy !!!

Jay_Diddy_B

--- End quote ---

Nice job!  :-+ You inspired me to try this on a TDS754A. However, I hit a roadblock on the HF_CAL. Like you, I don't have a Tek SG504, and instead tried using a R&S SMT 03. The SMT 03 only has output to +13dBm / 1.0V. This is not enough for the calibration to continue (I didn't find this out until almost 2 hours into the cal process.  |O Now all the calibration constants are Initialized.

Do you remember the max amplitude you needed to use on your E4425B during HF_CAL?
Looking at the specs on the E4425B, it too also has a max of 13dBm. Do you have Option UNB high output which gives +17dBm?

Looks like I'll need to score an amplifier - I was looking at HP 8447D amps but they are a bit pricey!
EDIT: not only that, but the output is only +7dBm - never mind...

Anyone have any recommendations for a low cost amp with a minimal frequency range of 6MHz to 1.05GHz?

Thanks!

Jay

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