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What does it take to design a good high voltage differential probe like TDP1000
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opa627bm:
Hi all,
I been looking around for probes from Keysight , Lecory ..etc and I can't find a diff probe from them have the same or better spec as a TDP1000 from Tektronix. I know the probe amplifier ASIC is a custom build from 1995 and still being used today, but what does it take build one from modern off the shelf components? Most of the diff probe browser are very bulky compared to TDP1000 too. Wonder why things hasnt been improved after so many years.

Regards,
Li
Someone:
They call it high voltage, but its really not.
Differential mode input voltage: ±42 v (DC + pk AC); 30 Vrms
Maximum input voltage (nondestruct): ±100 V (DC + pk AC)

See the problems people have on this forum trying to do x00MHz single ended, then add high impedance, then add differential. Rather expensive to engineer and uses expensive parts.

But most of the reason is the low volume and they don't invest in a highly automated assembly line for it. Order a few 100' thousands of them and watch the price come right down.
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