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MSO5000 Bode Plot Capability: Is it Good Enough? [Many tips about a 1st scope]

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balnazzar:

--- Quote from: Warpspeed on October 01, 2022, 11:28:53 pm ---Things such as frequency range, noise floor and dynamic range are pretty obvious, and many measuring instruments these days have some excellent features. If you are studying just analog type circuits, amplifiers, filters, servo systems etc... that is all pretty straightforward.

These days switching power supplies are a significant area of interest, and Bode plots are just about a must have, if you wish to maintain your sanity.
Switching supplies are are very Bode plotter unfriendly by being significant producers of wideband noise by the power components.

Trying to resolve a sine wave of a couple of millivolts submerged in hundreds of millivolts of spikes and ripple is something very simple equipment is just not capable of doing.  Its all very well the software being able to plot a nice smooth gain curve over 100db dynamic range, but unless millivolt or microvolt level signals can be resolved beneath huge levels of noise, the pretty plot on the screen is just not going to happen.

--- End quote ---

That's the point. I'll be studying the frequency response of amplifiers, filters, servo systems, etc, for a time. The next step forward would be power supplies. I'd like to have an instrument that scales up well, or at least acceptably..

If that's not possible with my budget, ok, but at least it has to be really good with the basic analog stuff.

balnazzar:

--- Quote from: balnazzar on October 02, 2022, 11:13:18 am ---
--- Quote from: nctnico on October 01, 2022, 11:16:03 pm ---No. But depending on your location, a GW Instek GDS1054B could be a good alternative to buy a decent 4 channel oscilloscope (options can be enabled for free using a key generator available on this forum). For example: https://eleshop.eu/gw-instek-gds-1054b.html

--- End quote ---

Interesting. Mh. How does it compare to the Siglent? Snappier UI?

The screen looks smaller than Siglent's, but it's still 7". Probably it's the scope body that's larger.. I'm seeing that people on this forum adapted a 8" screen, but it's far from being straightforward.

Tell me, is that Eleshop a reliable vendor? Thanks!

--- End quote ---

Addendum: How is the software?

nctnico:

--- Quote from: balnazzar on October 02, 2022, 11:13:18 am ---
--- Quote from: nctnico on October 01, 2022, 11:16:03 pm ---No. But depending on your location, a GW Instek GDS1054B could be a good alternative to buy a decent 4 channel oscilloscope (options can be enabled for free using a key generator available on this forum). For example: https://eleshop.eu/gw-instek-gds-1054b.html

--- End quote ---

Interesting. Mh. How does it compare to the Siglent? Snappier UI?

The screen looks smaller than Siglent's, but it's still 7". Probably it's the scope body that's larger.. I'm seeing that people on this forum adapted a 8" screen, but it's far from being straightforward.

Tell me, is that Eleshop a reliable vendor? Thanks!

--- End quote ---
IMHO Eleshop is a reliable vendor. I have bought some test equipment from them (and returned one as well because it didn't meet my expectations). The firmware for the GDS1054B is mature. If you do run into a problem, the service department from GW Instek is responsive and they will fix bugs (if you happen to find one). Personally I find GW Instek's UI easier to use compared to Keysight. The key difference is that GW Instek has a horizontal and vertical row of buttons which makes navigating through the menus much easier. The seperate 'select' button prevents you from turning the rotary encoder while pressing it and selecting a different menu item than the one you wanted to select (which typically happens to me when the rotary encoder and select button are integrated in one).

mawyatt:

--- Quote from: Fungus on October 02, 2022, 01:11:02 am ---

--- Quote from: mawyatt on October 01, 2022, 08:26:01 pm ---Having considerable 1st hand experience with the Bode function in the Siglent 2000X+

--- End quote ---

When did the 2000X series come into it? That's way over budget.

--- End quote ---

Maybe you should read the entire post and include what this was responding too!!

Here's the prior comment by nctnico:

"Have you considered getting a specific device for doing bode plots? What kind of frequency range are you after? Any amplitude & dynamic range requirements? The analog discovery is mentioned often as a tool for doing bode plots. From a comparison between various oscilloscopes made by one of the forum members, it seems Siglent's bode plot is rather slow so may not be ideal for doing a lot of bode plots in a short time."

So nctnico brought Siglent into the discussion, and we responded to such.

Regarding relevance, think 2N3055 covered that pretty well!!

Best,

2N3055:

--- Quote from: nctnico on October 02, 2022, 01:14:37 pm ---
--- Quote from: balnazzar on October 02, 2022, 11:13:18 am ---
--- Quote from: nctnico on October 01, 2022, 11:16:03 pm ---No. But depending on your location, a GW Instek GDS1054B could be a good alternative to buy a decent 4 channel oscilloscope (options can be enabled for free using a key generator available on this forum). For example: https://eleshop.eu/gw-instek-gds-1054b.html

--- End quote ---

Interesting. Mh. How does it compare to the Siglent? Snappier UI?

The screen looks smaller than Siglent's, but it's still 7". Probably it's the scope body that's larger.. I'm seeing that people on this forum adapted a 8" screen, but it's far from being straightforward.

Tell me, is that Eleshop a reliable vendor? Thanks!

--- End quote ---
IMHO Eleshop is a reliable vendor. I have bought some test equipment from them (and returned one as well because it didn't meet my expectations). The firmware for the GDS1054B is mature. If you do run into a problem, the service department from GW Instek is responsive and they will fix bugs (if you happen to find one). Personally I find GW Instek's UI easier to use compared to Keysight. The key difference is that GW Instek has a horizontal and vertical row of buttons which makes navigating through the menus much easier. The seperate 'select' button prevents you from turning the rotary encoder while pressing it and selecting a different menu item than the one you wanted to select (which typically happens to me when the rotary encoder and select button are integrated in one).

--- End quote ---
Little GW Instek 1000 has bode plotting?

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