Farnell E30/2 calibration - UK Vintage Radio Repair and Restoration Discussion Forum

MrBungle · 4th Oct 2017, 8:53 pm

I’ve got at least three different copies of the manual for my Farnell E30/2 power supply. Unfortunately none of them contain calibration information. Can anyone shed any light as to what the trimmers inside these actually do? There are 5 of them inside it!

ColinTheAmpMan1 · 6th Oct 2017, 12:37 pm

Have you tried comparing it with the manuals/circuit diagrams of the L-series power supplies? I wouldn't mind betting that the calibration method is similar. I have a couple of L-series power-supplies and unfortunately, the current calibration requires a variable resistor which can cope with the maximum current. It can get rather warm!
Colin.

MrBungle · 6th Oct 2017, 1:32 pm

I did actually look at that and unfortunately it's quite different as it has a hard current limit. I've resorted to building the DC side of it in LTspice and playing with the resistor values. I think I've nearly got it

mhennessy · 6th Oct 2017, 6:14 pm

Assuming you have the transistorised version rather than the later op-amp version:

T1 sets the maximum output voltage when in 30V mode.

T2 sets the maximum output voltage when in 15V mode. Do T1 first.

T3 sets the current limit.

T4 sets the current meter calibration.

T5 sets the voltmeter calibration.

Simples

MrBungle · 6th Oct 2017, 7:18 pm

That is the one indeed. Thank you very much for that - much appreciated!

MrBungle · 6th Oct 2017, 8:59 pm

Confirmed correct. All in calibration now. Thanks again

mhennessy · 6th Oct 2017, 9:22 pm

Excellent

4th Oct 2017, 8:53 pm	#1
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Farnell E30/2 calibration I’ve got at least three different copies of the manual for my Farnell E30/2 power supply. Unfortunately none of them contain calibration information. Can anyone shed any light as to what the trimmers inside these actually do? There are 5 of them inside it!

6th Oct 2017, 12:37 pm	#2
ColinTheAmpMan1 Octode Join Date: Jan 2012 Location: Wimbledon, London, UK. Posts: 1,465	Re: Farnell E30/2 calibration Have you tried comparing it with the manuals/circuit diagrams of the L-series power supplies? I wouldn't mind betting that the calibration method is similar. I have a couple of L-series power-supplies and unfortunately, the current calibration requires a variable resistor which can cope with the maximum current. It can get rather warm! Colin.

6th Oct 2017, 1:32 pm	#3
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Farnell E30/2 calibration I did actually look at that and unfortunately it's quite different as it has a hard current limit. I've resorted to building the DC side of it in LTspice and playing with the resistor values. I think I've nearly got it

6th Oct 2017, 6:14 pm	#4
mhennessy Dekatron Join Date: Jul 2007 Location: Evesham, Worcestershire, UK. Posts: 4,244	Re: Farnell E30/2 calibration Assuming you have the transistorised version rather than the later op-amp version: T1 sets the maximum output voltage when in 30V mode. T2 sets the maximum output voltage when in 15V mode. Do T1 first. T3 sets the current limit. T4 sets the current meter calibration. T5 sets the voltmeter calibration. Simples

6th Oct 2017, 7:18 pm	#5
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Farnell E30/2 calibration That is the one indeed. Thank you very much for that - much appreciated!

6th Oct 2017, 8:59 pm	#6
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Farnell E30/2 calibration Confirmed correct. All in calibration now. Thanks again

6th Oct 2017, 9:22 pm	#7
mhennessy Dekatron Join Date: Jul 2007 Location: Evesham, Worcestershire, UK. Posts: 4,244	Re: Farnell E30/2 calibration Excellent