Here some tiny tests with SDS7102V HW/FW 2.8.2.
Here some tests with new SDS7102V version 2.8.2.
Note: before I have made risetime test with Tektronix generator. In specs it have <1.3ns risetime but I have measured it... it is far more fast (perhaps under 1ns). It is clearly faster than this now used HP. So, this affect some amount and so these results are not directly comparable (exept if you think what itr affect... also pulse shape is littlebit different)
Risetime tests made using HP8161 pulse generator around 1.3ns specified risetime and measured around 1ns. 2meter coaxial cable and Tektronix 50 0hm feed thru terminator in scope input. (this method is not best possible but littlebit better than BNC T with terminator and this is also comparable to my other tests. Note that with this method there is not 50ohm impedance becouse oscilloscope input is not "ideal". Specially in this case there is parallel capasitance what destroy matching. And this is case also with many cheap oscilloscopes what do not have true 50ohm impedance inputs but there is just relay and 50 ohm resistor without real impedance matching for whole frequency area as is case in many expensive Tek and HP ("Agilitylend" who nearly destroy HP to level "all can do these cheap plastic boxes" and somebody who today try destroy Tek downcounting have started.)
All images, exept last one only CH1 in use.
Sweep tests and sinewaves are from Agilent 8644B signal generatorwhat have very good flatness and extremely good signal purity in this frequency area.
Same notes and connection as risetime test exept cable is around 1m.
Note: Voltage bands are I: 2mV to 100mV, II:200mV to 1V, III: 2V to 10V
![](http://i181.photobucket.com/albums/x2/aghp55/SDS7102V_linswp_1_250_50mV.png)
V/div 50mV (band I), sweep start green line and in end it go back to starting freq. Sweep is linear and sweep time is 100s. Oscilloscope 10s/div. One div is 25MHz. Oscilloscope is in peak mode.
-3dB point is around 175MHz related to 1MHz signal level.
![](http://i181.photobucket.com/albums/x2/aghp55/SDS7102V_linswp_1_250_500mV.png)
V/div 500mV (Band II), sweep start green line and in end it go back to starting freq. Sweep is linear and sweep time is 100s. Oscilloscope 10s/div. One div is 25MHz. Oscilloscope is in peak mode.
-3dB point is over 200MHz (225MHz) related to 1MHz signal level. (note shape... perhaps if better impedance matching there is less "waves" in shape and it is possible then -3dB point may move down (or up))
![](http://i181.photobucket.com/albums/x2/aghp55/SDS7102V_300MHz_500mV_persist.png)
Same settings and source level, sinewave 300MHz and infinite persistence for looking if some trig instability and/or vertical wobbler.
(freq counter max is around 320MHz and signal trig limit (single CH in use) is around 450MHz (but out of signal level specifications for trig of course)
![](http://i181.photobucket.com/albums/x2/aghp55/SDS7102V_rise_50mV.png)
Risetime Voltage band I. Signal shape is very good. Risetime (frequency response) is clearly better than specified. (<= 3.5ns)
![](http://i181.photobucket.com/albums/x2/aghp55/SDS7102V_rise_500mV.png)
Risetime Voltage band II. Signal shape is good. Risetime (frequency response) is clearly much better than specified. (<= 3.5ns) around 2.2ns in this test system. (real risetime is littlebit better but this moment I have not available better signal source. This can see if analyze image where is persistence and visible corner wobbling - also FFT tell same story)
Here now and later some more tests. Opinions are extremely important but real data is.... sometimes also good to know.
-aghp