Products > Test Equipment
Conversion of 500MHz TDS744A to 1GHz TDS784A
tford:
After reading the TDS744A to TDS784A conversion thread, I purchased a used TDS7444 in good condition. It appears to fully operational. Gave it a cleaning and removed the 4 capacitors (C1266, 67, 68, 69) and jumper R1064. The results were the addition of option 1G, (1GSPS Ch1, 1 GSPS CH2). The bandwidth did increase to 1 GHZ for all 4 channels, but no TDS784A 4 GSPS conversion. Any ideas of what I can do to complete the conversion? Also, I have FV:v1.1e instead of v1.0.1e.
Thanks
nctnico:
Perhaps the jumper is wrong one. Option 1G limits the samplerate to 1Gs/s instead of 2Gs/s (for export purposes) so this is BAD!
tford:
I checked my R1064 removal, all was good. I then removed all resistor jumpers, attached small wires to the R1061 through R1064 pcb pads and ran the wires out the board to a dip switch. With R1064 shorted and R1061,62,63 open, my power on self test screen displayed a TDS784 and the sample rate jumped to 4GSPS. Yeah! With all jumpers open, no TDS scope model was displayed on power up. Possibly the firmware version is set up to read the jumpers differently.
nctnico:
So the setting is the other way around: R1064 must stay!
tford:
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
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