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Author Topic: Help needed to identify HP card  (Read 434 times)

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Offline dreamthTopic starter

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  • Country: ro
Help needed to identify HP card
« on: August 05, 2025, 10:50:31 pm »
Please help me identify which HP equipment is   this card from.It contains two LDR and two diodes inside polystyrene foam  under the metalic hood which makes me think it should be some kind of oscillator.I have two identical ones and every card in the equipment came in two pieces, like for two completely separate channels.
https://imgur.com/a/NlhYm3k
https://postimg.cc/8fW5G6XB
https://i.postimg.cc/NFCr181V/IMG-20250806-011047.jpg
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Offline gslick

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Re: Help needed to identify HP card
« Reply #1 on: August 06, 2025, 02:57:28 am »
From the 07130-61300 part number on the PCB, and if it likely came from a dual channel instrument, maybe it came from an HP 7130A two-pen strip chart recorder. Those date from around the late 1970s.
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Offline dreamthTopic starter

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  • Country: ro
Re: Help needed to identify HP card
« Reply #2 on: August 06, 2025, 05:20:40 am »
Thank you very much! I found the service manual!
https://imgur.com/a/Xemd377
« Last Edit: August 06, 2025, 06:16:18 am by dreamth »
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