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Re: HP 8662A Power up - overvoltage shutdown
Hi all Tony, the simplest explanation for your problem is that the -40VDC supply has an insufficient load on it. What is the voltage, taken with a hand held DMM across R37, the 1R2 current sense
By george edmonds · #126598 ·
Re: Frequency range of HP 5352B frequency counter
wrote: As far as I can see from the manual, the input connector on the 46 GHz option is 3.5 mm, not 2.4 mm, which does surprise me. I bought the counter from eBay and had it delivered to a friend who
By Dr. David Kirkby, Kirkby Microwave Ltd · #126597 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi Gerhard, Look for service manual for the 8663A. You should find the schematic for A7A1 in service manual 4. The 8662 and 8663 use many of the same boards. Regards, Askild [email protected]> wrote:
By Askild · #126596 ·
33120A ref clock input (Re: [HP-Agilent-Keysight-equipment] 53181A 3 GHz prescaler from China)
This is a clock board for the 33220A (I have one of these in my 33220A): /g/HP-Agilent-Keysight-equipment/message/96733 Probably not the same as for a 33120A¡­ Gr¨¹?e, Carsten
By Carsten Bormann · #126595 ·
Re: Frequency range of HP 5352B frequency counter
Am 25.05.2022 um 08:56 schrieb Lothar baier: I changed the connector with PLANAR CROWN connectors. _._,_._
By DF6NA Rainer · #126594 ·
Info Need on a RF FET for a Agilent E4438C signal generator
I am rapiring a E4438C generator. There is a FET shorted in the output of chain of the 4Ghz path. The FET is called M11X1005. I can see traces of it existing but no data. The SHF-0189Z can be used but
By Peter Hansen · #126593 ·
Re: 53181A 3 GHz prescaler from China
Now what I want is a clone of the external clocking interface for the HP33120A. It's rather complex due to creating an internal 40MHz reference.
By Adrian Godwin · #126592 ·
Re: 53181A 3 GHz prescaler from China
Mine also came from the guy in Poland : he is on eevblog. It works well and avoids the problem with self-oscillation in some prescalers (due to being a clone of the HP design ).
By Adrian Godwin · #126591 ·
Re: HP P532A Frequency Meter Manual
Hi John unfortunately the 12.6 to 18 Ghz wave guide parts are not that easy to find at low cost as not used by radio amateurs The Frequency Meter is put in series with a RF signal generator and a
By Paul Bicknell · #126590 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi. If it is (as I think you said) a switching power supply, then usually only one output rail is regulated closely by the main switching regulation loop. The other rails rely on either close coupling
By Dave_G0WBX · #126589 ·
Re: Frequency range of HP 5352B frequency counter
The biggest problem you run into now in regards to upgrading a 5352B to 46GHz is finding the connector and the front/dress panel for the option 05 units. Option 05 did not only change the connector
By Lothar baier <Lothar@...> · #126588 ·
Re: HP 8662A Power up - overvoltage shutdown
OMG. Yesterday afternoon I did not know that A7A1 existed. Yesterday evening, I needed yet another signal generator and had to turn to my 8662A. That one had an easy live in the last years because of
By Gerhard_DK4XP · #126587 ·
Re: HP 8662A Power up - overvoltage shutdown
Good chance you have an open electrolytic filter capacitor on the PSU motherboard. From what I've seen, the supply tries valiantly to run in the presence of the resulting ripple, and it *almost*
By John Miles · #126586 ·
Re: HP 3465A offset when input shorted
Low leakage (< a few pA) given the input impedance for the low DC volt ranges. A 2N4117A/PN4117A diode connected FET perhaps? 40V breakdown and 50 mA max gate current. Horowitz/Hill in the Art of
By Orin Eman · #126585 ·
Re: Frequency range of HP 5352B frequency counter
It depends , the 46GHz option changed the input connector , the regular 5352 just as the 5351 used a 3.5mm male connector which will work to 40GHz with degraded specs which doesn¡¯t matter for a
By Lothar baier <Lothar@...> · #126584 ·
Re: Frequency range of HP 5352B frequency counter
Hi Lothar, I was refereeing to Dave's question of upgrading a 40GHz 5352B to a 46GHz 5352B option 5. And this is according to the posts I linked only connector and cable change. But as also described
By Askild · #126583 ·
Re: Frequency range of HP 5352B frequency counter
Actually not , there were also some component changes on the A12 board between the 51 and 52 Counters , you can look at the schematics of the board to figure it out Sent: Tuesday, May 24, 2022 1:46 AM
By Lothar baier <Lothar@...> · #126582 ·
Re: 53181A 3 GHz prescaler from China
I¡¯ve upgraded my 53181 with an eBay prescaler and oven timebase. I believe I got them from a fellow in Poland. No problems at all. For the timebase I calibrated it to a rubidium standard as
By Jeremy B · #126581 ·
Re: HP P532A Frequency Meter Manual
These are "waveguide flanges". Waveguide is a common, very efficient way to move microwave energy around. See the Wikipedia article about it for an introduction. The size of a waveguide, and thus the
By Dave McGuire · #126580 ·
HP P532A Frequency Meter Manual
I recently acquired an HP P532A frequency meter. I know it's a resonant cavity device that goes from 12.6 GHz to 18 GHz but I don't how or what to hookup to the two flanges to get it to work. I've
By johnasolecki@... · #126579 ·