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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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Labrat101:
If you use the probe directly it is already matched to the scope 50 \$\Omega\$.
Not Bad I have seen a worse . Your scope bandwidth is 50Mhz unless you have done an upgrade .
11Mhz square is at the upper end of your scope's limitation .
 So you wont see the jitter but just that thicker line .
 Try @ 3Mhz or Less square should be more in the bandwidth and set the probe to X10 .
 But by the width of that rise is properly 4ns +-

Rule of thumb you need a scope at least 5 to 10 time the Bandwidth of the Frequency required to see.
 There are other people on this forum  better at explaining this reason .

 :popcorn:
 enjoy

mawyatt:
The frequency of a squarewave has nothing to do with the edge rise and fall time, which is essentially independent of the waveform frequency. You need a scope rise time of better than 1/5 the measured rise time according to Tektronix, which using the usual 0.35/BW 1st order model for lower BW scopes would place the required scope BW of greater than  5*(.35/tr), or >175MHz for a 10ns rise time.

https://www.mouser.com/pdfdocs/Tektronix12_things_to_consider1.pdf

The reason for this 1/5, or 5X better scope rise time mentioned by Tektronix is that the scope and DUT rise time are uncorrelated and thus follow the effective "system" rise time as the usual tr-system = sqrt[(tr-scope)^2 + (tr-DUT)^2], so a 5X better scope tr only causes a 2% measurement error if I did my math correctly.

Anyway, hope this helps.

Best,   

de_light:
Scope is unlocked to 100MHz and probe set to 10x
Waveform at 3MHz

 

radiolistener:

--- Quote from: de_light on November 07, 2020, 10:45:12 am ---First image is an 11 MHz square wave output, 5VDC p-p. Second is with dots and 1s persistence.

--- End quote ---

if someone interested, here is the same 11 MHz 5 Vpp square wave taken from PSG9080 generator through 1 meter RG58 cable.
1) 1 MOhm input mode
2) 50 Ohm input mode
3) fall edge of the first cycle after trigger and rise edge of the second cycle after trigger (delay 70 ns after trigger)
4) rise edge of the second cycle after trigger with max oscilloscope resolution (2 ns/div, delay 70 ns after trigger)

jitter is about 0.6 ns peak-to-peak

I think amplitude error is due to to oscilloscope response flatness, because I tested PSG9080 with logarithmic detector and it's response is pretty flat up to 50 MHz and my multimeter shows pretty precise amplitude at low frequency (at 1-100 kHz).

Labrat101:
Hi .   @radiolistener
That's a Nice square wave with a low jitter.  :-+
 The PSG9080 is better built .
 All the FY series suffer from same old problems. 

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