Products > Test Equipment
Two Tone Test with Scope and SA
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David Hess:
The results are actually so good that I wondered if non-linearity in the source was cancelling non-linearity in the DSO but the SA results rule that out.

8 bit linearity is not particularly demanding of an oscilloscope front end (1 part in 200 or 0.5%, see below) and other errors tend to limit performance to below 8 bits anyway.  (1) Older DSOs tend to include over-ranging so the display only encompasses a range of say 200 counts or 50 points per division for 8 vertical divisions.  This leaves some leeway to align the waveform with the position control and do math on a displayed waveform which is slightly larger than the display without truncation.

(1) Linearity gets worse at higher frequencies, but this particular case is almost ideal.
egonotto:
Hallo,

several measures:

RTA4004 with 1MOhm (I forget switch to 50Ohm)
Picoscope 4262 with 50 Ohm
Picoscope 5243A with 50 Ohm

Best regards
egonotto
tautech:

--- Quote from: mawyatt on July 31, 2020, 06:45:25 pm ---Could I impose on you to do a couple of these tests with the 10 bit ADC mode?

--- End quote ---
10 bit mode with 10 KHz and 10 MHz 2 tone tests. AWG output now 0 dB.
Envelopes are always fun to get solid triggering on so holdoff added as/if required and done previously.  ;)

Again, SDS2104X Plus and SDG2042X.



jjoonathan:
Here's a SDG6022X into a RTO1024 oscilloscope and FSP spectrum analyzer.


mawyatt:

--- Quote from: PeDre on July 31, 2020, 07:52:46 pm ---I'm not sure I did everything right. I combined the two signals from the generator with a T-piece and terminated them with 50 Ohm on the oscilloscope. For now only a test with 100 kHz.

Is MaxHold correct for FFT?

Generator Rigol DG4162
Oscilloscope R&S RTB2004
Spectrum Analyzer Rigol DSA815 (with extern 20 dB Attenuator)

--- End quote ---

Think you want to resistively combine the two sources for the tones unless you can combine them internally like the Siglent. A resistive "T" should work, think this has 16.7 series ohms on each leg to maintain 50 ohms on all three ports.

Don't think you need to use the FFT max hold feature.

Best,
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