Goodmans Crossover Network Half Section - how to test? - UK Vintage Radio Repair and Restoration Discussion Forum

Serthish · 1st Jun 2020, 7:28 pm

Evening all,

Digging through my pile of stuff, I've found another goody that seems too good to discard - a Goodmans Crossover Network (Half Section) Type XO-950/5000
950 and 500 cycles 15 ohms.

Question is, can I test these just with a multimeter as I don't currently have the setup required to test them with speakers?

Thanks in advance

Diabolical Artificer · 2nd Jun 2020, 8:37 am

"Question is, can I test these just with a multimeter" Apart from continuity, no, you need a a signal generator and scope at the least, you need to do a frequency sweep and measure or just visual the OP. If you haven't got these you could use free software and use your PC, recommended is Soundcard Scope, has sig gen, scope, FFT & THD measurement, which is as good as my HP3903B. Also you could use Audacity, REW, ARTA and there's quite a few others. SC S is easy to use unlike REW and ARTA which takes some setting up and are very picky with what AI you use.

Andy.

Herald1360 · 3rd Jun 2020, 2:00 pm

You can safely assume that inductors are OK if they're not open circuit. Resistors you can check with multimeter though depending on the circuit you may have to lift one end. Capacitors ditto but you'll need an ESR/capacitance meter.

Its not a complex circuit so if the components are OK individually it will almost certainly work as intended.

1st Jun 2020, 7:28 pm	#1
Serthish Triode Join Date: Jan 2020 Location: Pentraeth, Anglesey, North Wales, UK. Posts: 16	Goodmans Crossover Network Half Section - how to test? Evening all, Digging through my pile of stuff, I've found another goody that seems too good to discard - a Goodmans Crossover Network (Half Section) Type XO-950/5000 950 and 500 cycles 15 ohms. Question is, can I test these just with a multimeter as I don't currently have the setup required to test them with speakers? Thanks in advance

2nd Jun 2020, 8:37 am	#2
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,658	Re: Goodmans Crossover Network Half Section - how to test? "Question is, can I test these just with a multimeter" Apart from continuity, no, you need a a signal generator and scope at the least, you need to do a frequency sweep and measure or just visual the OP. If you haven't got these you could use free software and use your PC, recommended is Soundcard Scope, has sig gen, scope, FFT & THD measurement, which is as good as my HP3903B. Also you could use Audacity, REW, ARTA and there's quite a few others. SC S is easy to use unlike REW and ARTA which takes some setting up and are very picky with what AI you use. Andy. __________________ Curiosity hasn't killed this cat...so far.

3rd Jun 2020, 2:00 pm	#3
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Goodmans Crossover Network Half Section - how to test? You can safely assume that inductors are OK if they're not open circuit. Resistors you can check with multimeter though depending on the circuit you may have to lift one end. Capacitors ditto but you'll need an ESR/capacitance meter. Its not a complex circuit so if the components are OK individually it will almost certainly work as intended. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O