HYPEX SMPS-400 Ripple

Kv3audio · 14th December 2011, 04:12 PM

Hello.

I am wondering if the ripple at the output of HYPEX-SMPS400 power supply is normal.

Oscilloscope pictures showing SMPS loaded at different loads.

Is this normal?

firechief · 14th December 2011, 04:21 PM

Tell us a little about your measurment technique. Is this a USB scope that I am looking at? Are you AC coupled or DC? What are you using for a scope probe and is it grounded?
What voltages is the power putting out, and how do you have it loaded for each of the screen shots? This looks like measurment error to me.

Kv3audio · 14th December 2011, 04:31 PM

Quote:

Originally Posted by firechief

Tell us a little about your measurment technique. Is this a USB scope that I am looking at? Are you AC coupled or DC? What are you using for a scope probe and is it grounded?
What voltages is the power putting out, and how do you have it loaded for each of the screen shots? This looks like measurment error to me.

I have taken these days ago.

Scope is 100MHZ digital Oscilloscope not a USB type.

DC Coupled.

Scope probe? x100

SMPS output without load is +-43VDC

Image 54 is 3.3Ax 81VDC
Image 57 9A x73VDC

Other cannot remember indeed. but max load was in image 57

Measure technique, scope probe connected directly at the output of the SMPS.

Scope is connected via Isolation transformer

Kv3audio · 21st December 2011, 10:35 AM

Still cannot determine if these measures are correct for HYPEX-SMPS400

Th3 uN1Qu3 · 21st December 2011, 04:44 PM

Quote:

Originally Posted by Kv3audio

Scope is connected via Isolation transformer

This is wrong. The scope must always be grounded to get proper measurements. Feed the power supply thru the isolation transformer and put the scope into a grounded outlet.

Tazzz · 23rd December 2011, 07:31 AM

Not really the scope can float but you have to remember leakage currents and the safety aspect of what potential is ground for the scope. To measure ripple its better to solder on a coax and use ac coupling on the scope the resolution of 10v/div is not great with 8bit adcs

14th December 2011, 04:21 PM	#2
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	Tell us a little about your measurment technique. Is this a USB scope that I am looking at? Are you AC coupled or DC? What are you using for a scope probe and is it grounded? What voltages is the power putting out, and how do you have it loaded for each of the screen shots? This looks like measurment error to me. __________________ "You can keep your insurance baby nothing is guaranteed" -Tom Petty

21st December 2011, 10:35 AM	#4
Kv3audio diyAudio Member Join Date: Sep 2011	HYPEX-SMPS400 Still cannot determine if these measures are correct for HYPEX-SMPS400

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23rd December 2011, 07:31 AM	#6
Tazzz diyAudio Member Join Date: Jun 2007	Not really the scope can float but you have to remember leakage currents and the safety aspect of what potential is ground for the scope. To measure ripple its better to solder on a coax and use ac coupling on the scope the resolution of 10v/div is not great with 8bit adcs

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