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50 ohm inputs for Siglent SDS1104X-E
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backyard_cnc:
My new Siglent SDS1104X-E lacked the 50ohm inputs that are required for most of the work I do in RF communications so I ordered up a pair of adapters from Amazon when I ordered the scope. They showed up today and a quick test with my tinySA ultra as a 10mhz signal generator shows that the -18dbm signal with its calculated conversion of 79.6mv p-p measures as 80mv which is significantly closer than the measurement without the impedance matching especially when the output of the tinySA is not necessarily precision calibrated!
David Hess:
The adapters just have a 50 ohm resistor in parallel with the oscilloscope input, which still has its associated input capacitance of about 15 picofarads.  They are useful to 200 or 300 MHz.
rf-loop:



All we who have old times calibrated and repaired Tektronix analog oscilloscopes are familiar with "Input Normalizer" (and there was many of them due to different inputs.  Yes purpose was different but principle same.   

This principle can use also for external 50 ohm termination (Disadvantage is attenuation..)  as well explained in this tube..  ;)
skander36:
On a Micsig scope (TO 3004) I have obtained even a slightly a better rise time with this load resistor(P57) than with it's internal 50 ohm path.
The result was 1,060 ns for internal 50 ohm and 0,993 ns with P57. With another source the result was  1.606 ns external 50 ohm(P57) and 1,879 ns for internal 50 ohm.
Aldo22:
I also bought one of these, but I think these are quite expensive for what they are.
So I made one myself for the second channel using two SMA connectors and two SMD 100Ω resistors as well as some copper shielding.
I can't measure any difference to the commercial product. Is there one?
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