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Re: Maintaining good Firmware EPROM, PROM, EEPROM etc.
Good Day, I have allowed myself a Bagero II programmer from Batronix many moons ago and I am very happy with it. Very stable software, which also supports Linux and MAC OS. See
By magnustoelle · #95045 ·
Re: Maintaining good Firmware EPROM, PROM, EEPROM etc.
And those of us that tweaked the 300 baud modems to 400 and 425.... Commodore 64, usually. Free speed increase. Couldn't believe it at 14yo.
By Colby Burkett · #95044 ·
Re: My $25 "In Poor Shape" 3468A has arrived
George asked for status of manual or auto and you didn't tell him as far as I know. I'm not sure whether manual mode and auto zero off are the same thing...
By John Griessen · #95043 ·
Re: HP8563 HV supply repair
Heh. My lab has an entire two-door metal cabinet dedicated to chemicals. Flux, de-fluxer, half a dozen lubricants, three or four de-greasers, conformal coating, Rubber ReNu, tin plating solution, a
By Dave McGuire · #95042 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Understood. The only front-panel actions I take are the ones you told me to take.? I select ADC and I turn off Auto Zero (SHIFT, INT TRIG).? And, for ADC measurements, I short U102.40 to U102.10.
By Jeff Anderson · #95041 ·
Re: Maintaining good Firmware EPROM, PROM, EEPROM etc.
Well, I wouldn't say "replaced"; it Ymodem was available but didn't catch on all that much. I used it, as did many people I knew, but it never became ubiquitous. There was also Xmodem-1K, which was
By Dave McGuire · #95040 ·
Re: Maintaining good Firmware EPROM, PROM, EEPROM etc.
X-Modem !? Wow now that's something I have not heard of in many decades. Do you remember when it was replaced by Y-Modem, then by the killer Z-Modem ? I thought I died & went to heaven when Z-Modem
By Gedas · #95039 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Jeff, You have not stated if the meter is in manual mode or auto mode in any of these tests.? That information is very important.? I cannot assume anything. GH
By [email protected] · #95038 ·
Re: My $25 "In Poor Shape" 3468A has arrived
(One more note...) I'm puzzled why the gain of U101 doesn't change in ADC-mode as the measured current goes above 300 mA (i.e. as the ADC Input goes above 10V). As a guess, I wondered if the gain
By Jeff Anderson · #95037 ·
Re: hp8640B strange output
I've got a few, NOS Raymond
By Raymond Domp Frank · #95036 ·
Re: HP8563 HV supply repair
Hello, Yup, just what I¡¯m planning - and also the comment I dreaded; likely arcing in the HV transformer... Regards, Staffan wrote:
By Staffan · #95035 ·
Re: HP8563 HV supply repair
Hello, As you explained the whole system is operating at low input and low HT. You have probably an arcing/failure at high/nominal HV. I suggest a test of each component at the service voltage to find
By jfphp · #95034 ·
Re: HP8563 HV supply repair
Hi. Looking at that schematic, it'd also be well worth checking the bridge rectifier on the "CRT SUPPLY" board, that develops the feedback signal for the regulator.? I can't quite read the component
By Dave_G0WBX · #95033 ·
Re: hp8640B strange output
Hi Ulf, Can you give some more details on this? Photos maybe schematics. What part did you use for the amplifier? Thanks. Szabolcs ulf_r_k via Groups.Io <ulf_r_k@...> ezt ¨ªrta
By Szabolcs Szigeti · #95032 ·
Re: HP5335A bottom cover
Is it possible the cover was replaced at some stage in the past and the American UNC thread was mated with a Metric screw or vice versa. That might explain the difficulty. Glad to hear you got it out
By nigel adams · #95031 ·
Re: HP8563 HV supply repair
Hello, Thanks. Didn¡¯t think an electronics lab would need so many chemicals. Will see what I can find. Don¡¯t dissolve the goop, but it seemed to be somewhat easier to remove from the board. Any
By Staffan · #95030 ·
Re: hp8640B strange output
One thing to check is the Final amplifier. If that one diesor gets deteriorated the ALC could play some tricks. Those are unobtanium, but can be replaced with a modern SOT-89 typefor a few bucks. I
By Ulf Kylenfall · #95029 ·
Re: I'm officially lost now with this 8753ES
Sorry, my mistake. I was thinking of the cavity oscillator adjustment procedure which looks for spurs around 3 GHz. Vladan
By pianovt · #95028 ·
Re: I'm officially lost now with this 8753ES
Peter, is this a typo? The cavity oscillator should be just below 3 GHz. Vladan
By pianovt · #95027 ·
Re: Maintaining good Firmware EPROM, PROM, EEPROM etc.
There is some connection with Stag... at least there are Stag copyrights in the Advin U84's code. -Chuck Harris Dave McGuire wrote:
By Chuck Harris · #95026 ·