Author Topic: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values  (Read 661 times)

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Offline piotekp90

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HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
« on: October 09, 2018, 09:31:22 am »
Hi,
Does anybody know the inductance of the L500, L501, L502, L503 inductors in the A9 output board in HP 6812A ac power supply?
I have this power supply but I see that this inductors have cracked cores and I would like to replace it.
 

Offline Chris56000

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Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
« Reply #1 on: October 09, 2018, 09:52:43 am »
Hi!

I wouldn't have thought they'd be much more than 40–100uH each about 3A rating – there's full component–level circuit diagrams in the service manual by the way!

Post clear pictures of the chokes please – it might help us identify replacement core kits you can use to repair them!

Chris Williams

PS!

Have you got one of those little cheap and cheerful Component Testers,?
It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 

Offline piotekp90

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Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
« Reply #2 on: October 10, 2018, 11:54:23 am »
At the beginning I have checked the service manual and schematic but there is no information about the choke value. If I put the part number on Keysight website I recive an information that this is obsolete part (without any more information about the choke).

I measured the chokes and they have around 100uH.
 

Offline piotekp90

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Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
« Reply #3 on: October 12, 2018, 07:54:53 am »
I have received informatin from Keysignt about this inductors:)



E CORE; 12.6 MM WIDE; 20.5 MM HIGH; 29.2 MM LONG; 1 SECT; FR MATL; 12 PINS; RECT. HOLE. BOBBIN-COIL FORM E CORE; 12.6 MM WIDE; 20.5 MM HIGH; 29.2 MM LENGTH; RECTANGLE HOLE SHAPE; 1 SECTION; APPLICATION : M 42/20; MATERIAL: REINFORCED NYLON 6/6 TO UL94VO; NO. OF PINS: 12 (2X6)

Inductance: 93-101uH @5V ocv. 100kHz 1.2 to 5.6
 


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