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GB for Virtins MI Pro for RTX6001 autoranging/autoscaling & for soundcard end users
GB for Virtins MI Pro for RTX6001 autoranging/autoscaling & for soundcard end users
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Old 18th October 2018, 06:03 PM   #471
lemon is offline lemon  Greece
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Join Date: Apr 2009
For the PSU Zo & Phase Output Test, which transformers characteristics are important, except the 1:1 ratio?
Any product example will be help.
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Old 19th October 2018, 07:04 PM   #472
VIRTINS is offline VIRTINS  Singapore
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Join Date: May 2008
GB for Virtins MI Pro for RTX6001 autoranging/autoscaling & for soundcard end users
Default Transformer for Isolation and Impedance Conversion

There is no need to keep the 1:1 ratio. Besides the isolation benefit, a transformer can provide impedance conversion in order to have the capability to pump more energy from the RTX6001 signal generator into the power supply under test. This will be useful if a perturbation current of more than 100 mA is required. Currently, without the transformer, most of the perturbation energy is consumed by the output impedance of RTX6001's signal generator itself and the max. perturbation AC current is limited to about 100mA.
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Last edited by VIRTINS; 19th October 2018 at 07:20 PM.
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Old 19th October 2018, 08:19 PM   #473
Jazid is online now Jazid  United Kingdom
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Join Date: Dec 2009
As a newbie/amateur I'd just like to say a big thank you to V/R and Virtins for this software (and of course Jens for the reason to develop it). Not only is it plainly useful as it is to me, but the continued conversations here add ever more value. Honestly I have learned at least as much as the software cost if I'd invested it in 'training'.
This is what forums should be for, so thanks guys!
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Old 20th October 2018, 12:46 PM   #474
lemon is offline lemon  Greece
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Join Date: Apr 2009
The frequency response of transformer isn't a limit factor about this measurement. Most Lundahl line-in transfo has until 70-85KHz response with ±0.5dB

Yes Jazid, you have right!

Thanks again to all for the help.
A small sample from the wonderful toy (MI-Pro & RTX) that we have
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Old 20th October 2018, 06:24 PM   #475
lemon is offline lemon  Greece
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Join Date: Apr 2009
A LT3042 Zo measurement @90mA, 2.8 mOhms floor.
I haven't used transformer, SE gen output.
Is that the limit of our measurement equipment?
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File Type: png Zo LT3042 2.8 mOhms.png (27.1 KB, 112 views)
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Old 21st October 2018, 08:59 PM   #476
VIRTINS is offline VIRTINS  Singapore
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Join Date: May 2008
GB for Virtins MI Pro for RTX6001 autoranging/autoscaling & for soundcard end users
In this case, the perturbation AC voltage across LT3042 is about 90mA x 0.1 x 2.8mohms =25 uV. Based on my previous loopback simulation, the output impedance can be measured with reasonable accuracy even at about 1 uV. The phase measurement will become inaccurate first.
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Old 22nd October 2018, 02:38 PM   #477
lemon is offline lemon  Greece
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This is fantastic (1 uV) and I am very happy about it!
I do some experiments with the LT3042 pcb to find how down can be the Zo!
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Old 27th October 2018, 11:46 AM   #478
lemon is offline lemon  Greece
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LT3045 Zo measurement with 0.9 mOhm minimum resistance output.
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Old 29th October 2018, 04:57 PM   #479
VIRTINS is offline VIRTINS  Singapore
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Join Date: May 2008
GB for Virtins MI Pro for RTX6001 autoranging/autoscaling & for soundcard end users
Thanks for sharing this. The result looks great!
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