Electronics > Beginners

Please share you're experience with BK Precision 4010A

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tautech:

--- Quote from: Electro Fan on June 14, 2019, 04:26:19 am ---(Just not sure why you raised this... it is good of you to be up front in helping users stay alert... but looking for some more insight.  Thx)

--- End quote ---
In reply to some assertions over repairability.

--- Quote from: bdunham7 on June 13, 2019, 05:54:50 am ---The Siglent that Tautech posted is also vastly superior in every conceivable way, except for the repairability issue.   

--- End quote ---
As I said, thanks to this forum we have a great resource to hunt out info to fix these things even though it's intended to be only at module level replacement like for most modern equipment.
So while we don't have schematics we have plenty of pics and threads from others that unfortunate learner errors that might damage equipment with reverse voltages that exceed output stage specification*.
While signal levels are not at high levels like mains it's very likely only output stages can be damaged like has happened in this thread:
https://www.eevblog.com/forum/testgear/siglent-sdg1032x-help-needed/


--- Quote ---1. What's the downside of turning on the OVP? 
--- End quote ---
Dunno, I'll leave some homework for you to do by looking up the Texas Instruments THS3095 datasheet.


--- Quote ---(If there is none, I'm guessing it would be on by default.)
--- End quote ---
It's not.


--- Quote ---2. What is an example of the most typical failure mode scenario that this is intended to prevent?
--- End quote ---
As above*.


--- Quote ---3. How is the Siglent approach to OVP any different than say Agilent/Keysight?
--- End quote ---
Dunno, do they have it ?

GerryR:
Here's an example of an output protection circuit from an old Krohn-Hite 1000A function generator with the explanation of how it works, that might be of interest to you.  It is out of their Operating and Service Manual for the unit.

Electro Fan:
Roger that.  It sounds vaguely similar to an audio tube amplifier circuit in which a resistor is sacrificed in an effort to save a tube or other parts of the circuit.

I kinda sorta understand the notion of OVP (and OCP) but what I’m still trying to get my head around is what causes the need to protect a function generator against reverse voltage?  For example, typically a FG might be hooked to scope inputs - not much chance for reverse voltage there... ?  Maybe this protection is just in case the FG is powering or driving a DUT and something goes wrong?  I guess this discussion has taught me to be a tad more cautious with FGs - might be a good heads up to keep the gozindas and the gozoutas going in the right directions.

robsims:
The shipping company in my country can not login after they have created an account on Siglent's website to purchase the SDG810. Think their website has a problem. I going  to purchase the SDG810 via them.

Anyone knows where they sell the SDG810 in the $230 (my budget)  price range?

 

GerryR:

--- Quote from: Electro Fan on June 14, 2019, 12:20:11 pm ---Roger that.  It sounds vaguely similar to an audio tube amplifier circuit in which a resistor is sacrificed in an effort to save a tube or other parts of the circuit.

I kinda sorta understand the notion of OVP (and OCP) but what I’m still trying to get my head around is what causes the need to protect a function generator against reverse voltage?  For example, typically a FG might be hooked to scope inputs - not much chance for reverse voltage there... ?  Maybe this protection is just in case the FG is powering or driving a DUT and something goes wrong?  I guess this discussion has taught me to be a tad more cautious with FGs - might be a good heads up to keep the gozindas and the gozoutas going in the right directions.

--- End quote ---


You basically hit it; if the device you are testing has a problem, or you grab the wrong point in the circuit with the FG probe, or you have the probe hooked to something in your circuit, and it pops off and falls on a high voltage trace, or the like, you don't want to fry your FG.  Most FG are even protected against a direct short across the output(s), at least for a time, to help protect the output against an inadvertent short.  A lot easier on the pocketbook that way!  ;D





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