| Products > Test Equipment |
| Siglent1104X-E versus Square Waves |
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| TheDefpom:
The scopes bandwidth limit isn't set to 20MHz is it instead of Full Range? |
| tautech:
--- Quote from: TheDefpom on August 07, 2023, 05:37:50 am ---The scopes bandwidth limit isn't set to 20MHz is it instead of Full Range? --- End quote --- No or we could see that in the channel tab as a B. (BW limit engaged) First thing I checked. ;) |
| maddoxhq:
Woof, if I was confused before I'm especially confused now. My 50ohm feedthrough arrived and wanted to familiar myself with it. I also purchased some BNC jumper extensions to connect my signal generator to my scope directly. With the 50ohm feedthrough I piped a 1MHz signal directly into the scope at 1Vpp, no offset, AC coupled. I was surprised to see that it attenuated the signal to about half, 500mV. I then took a second BNC jumper and put the exact same waveform into the scope on channel 2. And I get 1Vpp. tautech, when you responded to my question about the 47ohm resistor you said this was normal, but I guess I wasn't expecting this to be true on a device that was strictly meant for impedance matching. I guess when it comes to looking at testing bandwidth on an oscilloscope and using a feedthrough. Should I just know in the back of my mind the signal is getting attenuated and adjust the signal generator so the oscilloscope "sees" 1Vpp, then try to find the .707Vpp point? I know I'll never be able to with this signal generator as it maxes out at 30MHz, but I did see the spec on the PP510's where it said that they're 100MHz on 10X setting, and 8MHz on 1X. At least I could test that. |
| tautech:
Most AWG's output is a 50 Ohm source and you need tell it the load it will see. If set to a HiZ output and you place a 50 Ohm terminator on it the output will ~halve. So typically you use 2 impedances, HiZ or 50 Ohm and you need set for either and use an appropriate network/cabling/termination for the signal transmission. Also AWG output is normally offset by half the signal amplitude so unless you set the max or min value differently and only when you do does scope AC input coupling offer any advantage. Keep playing around, you'll learn heaps about this sort of stuff. ;) |
| maddoxhq:
Lol, if I don't lose my sanity first. I honestly don't think it has a HiZ mode. I just put the output of the AWG out it's normal leads, to the oscilloscope probe, through the 50ohm terminator. Set the AWG to 1kHz, 1Vpp. Now the scope is reading 120mVpp, and the measured frequency is bouncing around between 1.14 - 1.23kHz. However the measure function sees it as 1kHz. The trigger is having a hell of a rough go at keeping stable though. |
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