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Date
Re: 11713A attenuator driver modification for 15V and 5V
Doh, got the 120 ohm in wrong place, should go between output and adjust pins. I was rushing to do it before work this morning. Switch is correct, it's supposed to short out regulator for 24V. This
By Robert G8RPI · #94800 ·
FS: Price Drop....HP-Agilent & Motorola Data & Catalogs
Price drop on all remaining data books: *HP annual catalogs are in near mint condition, $10/ea:* 1994, 1995, (2) 1996, 1997, 1998, 1999, 2008/2009, HP RF uW & Test Accessories (1997/1998), Agilent RF
By Gedas · #94799 ·
Re: 11713A attenuator driver modification for 15V and 5V
Switch is drawn wrong, shorts out regulator. Draw it ot select output of reg or straight 24 V line. Jeff Kruth ____________In a message dated 3/1/2019 2:38:43 AM Eastern Standard Time,
By Jeff Kruth · #94798 ·
Re: 8753ES progress(?)
Found source module¡­ will send pics. P
By Pete Manfre <pmanfre@...> · #94797 ·
Re: 8753ES progress(?)
Moving the boards doesn¡¯t budge a thing. The inside of this unit is extremely clean and I wiped the contact fingers with a light coating of DeOxit Gold so I don¡¯t think that¡¯s an issue. Peter
By Peter Gottlieb · #94796 ·
Re: 8753ES next step
The only adjustments I¡¯ve made so far are the loading of default correction factors as described in the troubleshooting guide. There are two issues I want to track down before considering the unit
By Peter Gottlieb · #94795 ·
Re: 8753ES progress(?)
I assume you did the obvious. Flex the boards slightly, tap the motherboard, pull the boards and use a white eraser on the contacts (I tried to rub the gold off and don't believe it can be done but
By peter bunge · #94794 ·
Re: 11713A attenuator driver modification for 15V and 5V
Hi, You have to modify the schematic a bit, as it wont work now, the output must be connected somehow to the ref pin. The LM317 output pin should go direct to the coil, and the 120ohm resistor should
By Askild · #94793 ·
Re: 8753ES next step
Yes, it still sounds like your Pre Tune frequency is out of range. Don't adjust anything until you confirm this is not the case. You can pull it slightly by adjusting one of the resistors as per my
By peter bunge · #94792 ·
Re: HP8562A firmware
Thank you Askild. I will order the right parts. I replaced the 28C16 in two analyzers exactly as described by HP (life!) without any issues or error messages. After debugging one and finding the RF
By Harke Smits · #94791 ·
Re: 11713A attenuator driver modification for 15V and 5V
If you want to modify the unit, fitting a 3 position (24/15/5 volt) switch and a LM317? in series with pin 1 of the output connector would work. The switch would be a 3 position double pole (a
By Robert G8RPI · #94790 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Thanks George, You are a wealth of information. Grabbed a couple pair. Can never have too many probe sets. Thank you. Dave
By Dave Miller · #94789 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Greg, Glen, Dave,? You guys are a better source and recommendations for commercial test leads and probes than I would be.? I have always built my own passive and active probes so have never looked
By [email protected] · #94788 ·
Re: My $25 "In Poor Shape" 3468A has arrived
I picked up a set of 34132 probes for $20 off eBay, but they have fixed sheaths, so I got a pair of Pomona 6728 sheathed to unsheathed banana plug adapters.
By Glen Hoag · #94787 ·
Speaking of ohmmeters and such - need info on Meg-Chek 2801 D
The recent ohmmeter talk and such brings me to ask a somewhat OT question. I've been working on some HV stuff recently, so involving my inventory of high voltage/value resistors, and my now-favorite
By Ed Breya · #94786 ·
Re: My $25 "In Poor Shape" 3468A has arrived
The current set of probes is 34137A. The ones George mentioned have have been superseded by several models. They are priced at a modest $75 CAD. Less than what the meter cost me. Dave VE7HR
By Dave Miller · #94785 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Deoxit is great.? I have used it to clean/treat switches on my Keithley and Fluke DMMs and it works very well.
By gregdunn@... · #94784 ·
Re: My $25 "In Poor Shape" 3468A has arrived
Alex, The 3468/78 were sent to customers with just such a set of removable tips / alligator clips / spring loaded hooks.? The part number for that test lead set is? ?Hp 34118A. If you want the
By [email protected] · #94783 ·
Re: 8753ES progress(?)
I did this and hope I did it right.? It's not easy without the filter. The unit seems to be closer to operating.? I am not sure if this helped or not; I'm getting results nearly identical to my
By Peter Gottlieb · #94782 ·
8753ES next step
No joy.? I will have to look into this further and compare with other instructions.? I will be doing a complete alignment once I straighten this all out. So, it appears that my opening up the source
By Peter Gottlieb · #94781 ·