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Re: 3456A Voltmeter
So what's a fair price for the 3456A without a known state of calibration? I'm still looking at the 3478A's as well or maybe even the 3468A. Something really intriguing about the 3456A however. I did order one of the fluke 8050A's just because. Found one that was powered on and appeared very clean. Doubt I'll have it before x-mas however. Can one really have too many meters ?
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Thanks, Jeff On 12/20/2012 9:42 PM, David C. Partridge wrote:
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Re: 3456A Voltmeter
Normal behaviour. They have VERY high input impedance on the low voltage ranges, so any stray charge can cause a reading.
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Dave -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Michael Hong Sent: 20 December 2012 23:23 To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] 3456A Voltmeter Hi everyone, I just bought two 3456As from the same dealer off eBay. Both of them have the same problem. When they are turned on, the number drift from low mV number and goes up to -8.nnnnn for one meter and the other meter to -6.nnnn. And then float around there. When I short the leads at Ohm or Volt setting, they show the near zero and when disconnected, go to their the number again. I expect they stay at very low mV or zero without any input. What seems be the problem? Thank you. [Non-text portions of this message have been removed] ------------------------------------ Yahoo! Groups Links |
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Parts to repair an HP 6434B 40V 25A power supply
James Newton
Just purchased this thing from eBay and the seller shipped it without ANY padding on the bottom of the box. I know they are pretty well built, but that's just crazy... He refunded the purchase price, so I got what's left for the shipping.
Right handle sheared off the case, the ends are bent so I doubt I can drill out the bolts and re-mount it. HP Part # 5020-5512 And the left (voltage) meter was pushed back into the case after the handle wiggled over to that side and got pushed up against the box. The meter /may/ be ok, but the little black plastic bezel that holds the meter in is cracked. HP part # 4040-0296. And the (-) binder clip is sheared off. No problem repairing that. I can probably live without the handle. Any ideas where I can get a new bezel or mount that meter? Very strange mounting system. Hope someone here has seen it and knows what I'm talking about. By way of introduction: I've been in firmware most of my life, I ran the MIT PIClist mailing list for years and still archive it at PICList.com. I make and sell some open source stepper drivers now and so I'm getting more into electronics. I have a 1662C 'scope and a 1653B analyzer that I love. Can't beat the old stuff. |
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Re: JFET type? used in 8558B SA
vk5xgh
Symon, I have emailed you the file but have been unable to upload to the group files section, here for all others is the link to an excel file of unknown origin which contains the info for 1855-0062 and many others
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Regards Greg vk5xgh --- In hp_agilent_equipment@..., "kennedysymon" <torview@...> wrote:
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Re: HP-608A Repair
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----- Original Message -----
From: "Bob Albert" <bob91343@...> To: <hp_agilent_equipment@...> Sent: Thursday, December 20, 2012 5:15 PM Subject: Re: [hp_agilent_equipment] HP-608A Repair Richard, Perhaps you and I could get that beast going. Between us we have the resources, for the most part, and it would be fun. Trouble is, I think it's too far away. Bob I didn't pay any attention to where he is. For the most part they are not difficult to work on although they can have some mysterious problems. At the moment I am in the midst of retiring. I ran out my disability insurance and there is no point in going back to a job I dislike. I have been fully vested in the pension system for several years now so I may as well collect it. I have SS and Medicare so shouldn't do too badly. Anyway, I hope so. -- Richard Knoppow Los Angeles WB6KBL dickburk@... |
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Re: HP-608A Repair
Bob Albert
Richard,
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Perhaps you and I could get that beast going. Between us we have the resources, for the most part, and it would be fun. Trouble is, I think it's too far away. Bob --- On Thu, 12/20/12, Richard Knoppow <dickburk@...> wrote:
From: Richard Knoppow <dickburk@...> |
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Re: 3456A Voltmeter
It is probably not a problem. The input impedance on the low voltage DC ranges is very high (over 10000 MEG ohms), so even 1 pico ampere of bias current would produce over 10mV of apparent input voltage with open terminals.
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Try shunting a 10 MEG ohm resistor across the input and see what the DC voltage reading is. --John Gord --- In hp_agilent_equipment@..., Michael Hong <mcllhns@...> wrote:
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Re: HP-608A Repair
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----- Original Message -----
From: "Dennis Klipa" <klipadk@...> To: <hp_agilent_equipment@...> Sent: Thursday, December 20, 2012 3:37 PM Subject: Re: [hp_agilent_equipment] HP-608A Repair Richard and Dave,These are not too difficult to work on. The handbook procedure is fairly complete. There are some tricks if the dial does not come in to calibration. Most of the problems are from tubes, either in the power supply or the 6CL6 tubes used in the modulator/level control circuit. I don't know how available the pencil tubes are these days. I also suspect that the electrolytic caps should all be replaced as routine. Its possible one of the custom cap makers, like Hayseed Hamfest can help. Depending on what you want to do with it its a very good generator. -- Richard Knoppow Los Angeles WB6KBL dickburk@... |
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Re: 3456A Voltmeter
J. Forster
Input offset current.
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-John ============ Hi everyone, |
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Re: HP-608A Repair
Richard and Dave,
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Thanks for the leads. I did find that it is the HP 608D with the crystal calibrator option. I also found a photo of a 608D without the crystal calibrator. I am still looking for someone who might repair these things, notwithstanding the question of whether it is worth the expense. Best Regards, Dennis, N8ERF On Thu, Dec 20, 2012 at 2:58 PM, Richard Knoppow <dickburk@...>wrote:
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3456A Voltmeter
Hi everyone,
I just bought two 3456As from the same dealer off eBay. Both of them have the same problem. When they are turned on, the number drift from low mV number and goes up to -8.nnnnn for one meter and the other meter to -6.nnnn. And then float around there. When I short the leads at Ohm or Volt setting, they show the near zero and when disconnected, go to their the number again. I expect they stay at very low mV or zero without any input. What seems be the problem? Thank you. |
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Re: JFET type? used in 8558B SA
Geoff
Priority International is a scam, I send all small packages up to 4# First Class International for a lot less and delivery is typically 3-4 days to the majority of EU. I do not ship to Italy.
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----- Original Message -----
From: Dennis Czelusniak To: hp_agilent_equipment@... Sent: Thursday, December 20, 2012 4:31 PM Subject: Re: [hp_agilent_equipment] Re: JFET type? used in 8558B SA Ask ebay seller to ship USPS priority in small USPS box. He will still be making money on shipping and you should not be charged any extra. From: erich_schlecht <schlechtca@...> To: hp_agilent_equipment@... Sent: Thursday, December 20, 2012 4:13 PM Subject: [hp_agilent_equipment] Re: JFET type? used in 8558B SA Symon, I just looked and the ebay guy is the same as Global test, and they want a ridiculous amount to ship overseas. ($45!) Erich --- In hp_agilent_equipment@..., "erich_schlecht" <schlechtca@...> wrote: > > Symon, > > Four possibilities - > > 1. Already mentioned, try Agilent > > 2. There's a guy on Ebay selling them, item 251023608740 > > 3. Commercial vendors: > Talon-- > Global test -- > Tucker -- > > 4. Substitute a (relatively) commonly available 2N4416, which has similar specs to the numbers Vladan gave. > > Good luck! > > Erich > > > > --- In hp_agilent_equipment@..., "kennedysymon" <torview@> wrote: > > > > Does anyone please know of an available equivalent for the HP JFET P/N 1855-0062 or what its characteristics are? > > My web searches have failed > > Thanks, Symon G4DND > > > ------------------------------------ Yahoo! Groups Links ------------------------------------------------------------------------------ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1430 / Virus Database: 2637/5473 - Release Date: 12/20/12 |
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Re: N-type and SMA handling and user guide
Hi Brooke and Painovt,
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Thanks for the feedback and usefull links. The biggest single issue I have with a bunch of my Engineers is how to communicate they need to respect and be responsibility of handling, cleaning and storage of precision machined connectors. How true. "Bad connectors result in bad measurements" The HP document and the Microwaves101 helps. Merry Christmas and a happy new year to everyone. Regards Gerald VK3GJM --- In hp_agilent_equipment@..., Brooke Clarke <brooke@...> wrote:
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Re: JFET type? used in 8558B SA
kennedysymon
Jim, Ed, David, Vladan, Erich & Dennis,
All info gratefully noted. ... As for that ebay seller wanting $45 for int shipping - who are they kidding? I've got family in Cleveland OH., so can ask them to ship there and the family send on to me... I've also had direct mail from Joel who has kindly offered to sell me some. With all the help on here I know a lot more than I did and I reckon my problem is virtually solved! Thanks guys, Symon |
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Re: JFET type? used in 8558B SA
Ask ebay seller to ship USPS priority in small USPS box. He will still be making money on shipping and you should not be charged any extra.
From: erich_schlecht <schlechtca@...> To: hp_agilent_equipment@... Sent: Thursday, December 20, 2012 4:13 PM Subject: [hp_agilent_equipment] Re: JFET type? used in 8558B SA Symon, I just looked and the ebay guy is the same as Global test, and they want a ridiculous amount to ship overseas. ($45!) Erich --- In hp_agilent_equipment@..., "erich_schlecht" <schlechtca@...> wrote:
------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
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Re: JFET type? used in 8558B SA
Symon,
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I just looked and the ebay guy is the same as Global test, and they want a ridiculous amount to ship overseas. ($45!) Erich --- In hp_agilent_equipment@..., "erich_schlecht" <schlechtca@...> wrote:
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Re: JFET type? used in 8558B SA
Symon,
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Four possibilities - 1. Already mentioned, try Agilent 2. There's a guy on Ebay selling them, item 251023608740 3. Commercial vendors: Talon-- Global test -- Tucker -- 4. Substitute a (relatively) commonly available 2N4416, which has similar specs to the numbers Vladan gave. Good luck! Erich --- In hp_agilent_equipment@..., "kennedysymon" <torview@...> wrote:
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List of HP 70000 modules
David Kirkby
If you own or know of the HP 70000 series modular measurement system,
you will know it consists of a display unit, with modules which plug in, and can be configured to do various things - spectrum analyzer for example. If you have more modules, you just add another mainframe. Does anyone have a list of the modules available for this? I found a partial attempt of this at I just did a few searches on eBay, on terms I thought might be used, and see these listed. Can anyone add any more? These are in numerical order. 700001A MAINFRAME 70004A COLOR MAINFRAME DISPLAY 70100A Power Meter 70205A GRAPHICS DISPLAY 70300A Tracking Generator 20 Hz to 2.9 GHz 70301A Microwave Tracking Generator. 70310-60016 40V Power Supply Pack Precision Frequency Reference 70000 70310A Precision Freq ref Frequency Reference 70311A Clock Source Module 70340A Microwave Synthesizer, 1 GHz to 20 GHz 70420A Baseband Phase Noise Test Set 70600A Preselector Module, 0-22GHz, for MMS System 70611A MMS Module Attenuator / Switch Driver 70612A K52 MMS INTERFACE POWER AMPLIFIER 70612A K53 MMS INTERFACE MIXER MODULE 70612C K51 MMS INTERFACE TEST PORT MUX 70612C K54 MMS STIMULUS RESPONSE MATRIX 70620A Pre-Amplifier Plug-In 2-22GHz 70700A Digitizer Module 70800B MSIB CABLE 1 METER ~ HP 70000 SERIES 70810B Lightwave Receiver Module 1200nm to 1600nm 70820A Microwave Transition Analyzer, DC - 40 GHz 70842A Error Detector Plug-in, 100Mb/s to 3Gb/s Telecom Test Module 70842B Error Detector Plug-In Option H50 .05-3Gbit/s 70846A Error Detector, 50 Mb/s to 1 Gb/s, Plug-In 70900A Local Oscillator Module provides a swept LO signal of 3.0 to 6.6 GHz 70902A IF Section Plug-In 10Hz-300kHz 70903A 100kHz - 3MHz IF Module 70905A 50 kHz TO 22 GHz RF SECTION 70905B RF Section 50 kHz - 22 GHz 70907A EXT MIXER FOR 70000 SPECTRUM ANALYZER 70909A 100Hz - 26.5GHz RF plugin. Dave, G8WRB |
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Re: JFET type? used in 8558B SA
Hi Symon,
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There is no standard part number for this FET, but it was made by several manufacturers including TI, Motorola and Siliconix. N-ch, depletion mode Abs. max power rating: 300mW Gfs: 2-6 millimho at Vds=20V BVGDS: 30V min. Idss: 3-10 mA Vp/Vgs (threshold): 2-6V Igss: 1nA max. Css: 6pF max. Crss: 2 pF max Good luck, Vladan --- In hp_agilent_equipment@..., "kennedysymon" <torview@...> wrote:
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David C. Partridge
ve2zaz
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