Bode plot with an external generator
A Bode plot from any generator, so scopes without one of their own get Bode too.
Add-on video
What it does
Three ways. Follow: set your generator to sweep by itself, and the scope catches the sweep's start, reads the frequency in every capture and places each point by it. LAN: the scope steps a Rigol DG, Siglent SDG or Keysight 33500 over the network, point by point. Script: at each point the scope waits for your script to set any generator and say Ready.
So the DHO800 and the DHO914 and DHO924, which have no generator, get a Bode plot too. On our MHO934, following its own generator's 1 kHz to 1 MHz sweep, all 40 points came within 0.09 dB and 0.12 degree of flat.
How to use it
- In the Bode window, Gen offers Follow, LAN or Script.
- Follow: match the window's Start, Stop, scale and sweep time to the generator's sweep, and Run.
- LAN: pick the maker and type the generator's address.
- Script: Run, and let your script answer :NOVAos:BODeplot:SCRipt:STATe? at each point.
On Rigol's firmware
DHO800: not offered · DHO900: not offered · MHO900: not offered.
Where it stands
Built, and run on our MHO934 in Follow and Script modes (the videos). Running all three from the scopes' screens, and a network generator on our bench, are next.
A paid add-on; none is for sale yet. Everyone named on its request page keeps it free. Core and add-ons.