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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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HP8116A *almost* working perfectly
Hello all,
I have this HP 8116A 50MHz Programmable pulse/function generator that's almost working perfectly. However, whenever the amplitude is set below EXACTLY 10.00 volts, the output puts out nothing. 9.99 volts and lower does not work at all. Any ideas? Thanks! |
#2
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HP8116A *almost* working perfectly
JW wrote in message
... Hello all, I have this HP 8116A 50MHz Programmable pulse/function generator that's almost working perfectly. However, whenever the amplitude is set below EXACTLY 10.00 volts, the output puts out nothing. 9.99 volts and lower does not work at all. Any ideas? Thanks! Different make but the symptoms surprisingly the same and rang a bell, nasty to work on IIRC Philips PM5770 pulse generator Output on 10V setting but not lower settings. Inside the screened attenuator box a secondary switch mechanism comes into action in the 10Volt position but was failing to return on spring action on lower settings. from my repair briefs file http://www.divdev.fsnet.co.uk/repair4.htm -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
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HP8116A *almost* working perfectly
JW wrote:
Hello all, I have this HP 8116A 50MHz Programmable pulse/function generator that's almost working perfectly. However, whenever the amplitude is set below EXACTLY 10.00 volts, the output puts out nothing. 9.99 volts and lower does not work at all. Any ideas? Thanks! Do you have the manual? http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL &ckey=615544&lc=eng&cc=US&nfr=-536900193.536900597 Some of the programmable generators use relays to switch pads in and out, to set the output level. They fail, from heavy usage. I had most of them go bad in an old HP 3325B over a couple year period of daily use. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#4
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HP8116A *almost* working perfectly
JW wrote:
Hello all, I have this HP 8116A 50MHz Programmable pulse/function generator that's almost working perfectly. However, whenever the amplitude is set below EXACTLY 10.00 volts, the output puts out nothing. 9.99 volts and lower does not work at all. Any ideas? Thanks! Does it have a switchable output attenuator that should switch at that level? I would look for something like that. Chris |
#5
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HP8116A *almost* working perfectly
On Fri, 17 Aug 2007 13:21:42 -0400 "Michael A. Terrell"
wrote in Message id: : JW wrote: Hello all, I have this HP 8116A 50MHz Programmable pulse/function generator that's almost working perfectly. However, whenever the amplitude is set below EXACTLY 10.00 volts, the output puts out nothing. 9.99 volts and lower does not work at all. Any ideas? Thanks! Do you have the manual? http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL &ckey=615544&lc=eng&cc=US&nfr=-536900193.536900597 Yup. Got it, but no schematics on that one... Some of the programmable generators use relays to switch pads in and out, to set the output level. They fail, from heavy usage. I had most of them go bad in an old HP 3325B over a couple year period of daily use. Thanks! That gave me the clue I needed. I found a number of reed relays and 'scoping out their coil inputs while switching between 9.99 and 10.00 volts noticed that one of them was only getting down to about 2 volts. Traced it back to a 74LS374 octal latch - it's pin 9 output was bad. The chip is located on the bottom board of the 3 stacked boards in the unit. The chip is located on the right side near the front panel when the unit is oriented facing you. Thanks again, Michael. And thanks to N Cook and Chris as well! |
#6
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HP8116A *almost* working perfectly
JW wrote:
Thanks again, Michael. And thanks to N Cook and Chris as well! You're welcome. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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