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File /5086-7934__8753 EYO.pdf uploaded
#file-notice
Group Notification
The following files and folders have been uploaded to the Files area of the [email protected] group. By: Yves Tardif <yves_tardif@...> Description: |
Re: HP 8447x Series Amplifiers Power Switch
Thanks for your advice. I actually found a couple new switches and ordered them.
By the way, according to a Keysight post (https://edadocs.software.keysight.com/kkbopen/part-number-for-s1-on-the-8477a-588266906.html), the correct switch p/n is 3101-1395 not 3101-1248. -- Whitham D. Reeve Anchorage, Alaska USA --- |
Re: HP 8447x Series Amplifiers Power Switch
The switch is an HP 3101-1248 Illuminated AC DPST switch 10.5A 28VDC 125/250VAC. The OAK 53-55480-121 was often used.? It is a riveted design. Normally I would recommend disassembling a switch to clean and lubricate each part as needed. If you have a lite touch you can drill the rivets and replace them with screws and nuts. If you choose the less invasive option, use a contact cleaner without lubricants or general electronics cleaner also without lubricants. Either option should not damage the switch or degrade it in anyway. But should is not won't. If you need absolute certainty, disassemble the switch.? On Wed, Nov 29, 2023, 5:56?AM WReeve <whitreeve@...> wrote: I'm looking for some advice on the 8447x power switches and how to fix them so they operate smoothly. |
N5181A Sig Gen Intermittent Power Switch
Greetings to all readers!
This 6GHz sig gen is functioning properly in every way, except for apparently intermittent operation of the ON-OFF button and associated electronics.? When the button is pressed, sometimes the sig gen starts immediately, whilst on other occasions the amber and green LEDs oscillate "...green-amber-green-amber..." and so-on at about 2 Hz until the machine eventually does start.? The length of time the LEDs spend oscillating in this way is unpredictable, from just a couple of seconds to, say, two minutes.? In the end the sig gen does eventually start, but obviously something is amiss and should be attended to. I believe that the occurrence of this intermittency is more frequent when the atmospheric humidity on the day is greater than usual and, in that I am located in sub-tropical Brisbane, Australia, this effect is becoming more bothersome at this time of the year.? (I am not having any problems with any of the other soft-touch buttons on the front panel.) Page 1-57 of the Service Manual mentions these green and amber LEDs, but does not reveal much more. My intuition is that some dirt has built up in the high impedance electronics associated with the operation of the ON-OFF button and that as soon as the touch of the button is detected, either the 'switch off' sequence is also initiated, or some sort of high impedance short to somewhere is also detected, aborting the switch-on process. Has anyone had this type of problem before?? Can anyone please suggest a solution?? All replies will be greatly appreciated!? Thanks in anticipation.... --Doug Friend, VK4OE. |
HP8753ES and speed
Will an HP8753ES with the built in S-parameter test set slow down calculations compared to using an HP8753ES with opt 011 and the Transmission/Reflection test set (HP85044A)?
Our present analyzer is an HP8753ES - 011 --- It does not have a?built-in or attached S parameter test set - it only uses a Transmission/Reflection test set ( HP 85044A). We measure the properties of resonances in our cavity, up to 3 GHz,in?the "thru" mode ( i.e. transmission mode) - We need the peak frequency?and the coupled Q of each resonance. Our unit displays them on the screen when we select the correct display?mode. More importantly, we use a Labview-based program and GPIB commands to?interrogate the Network Analyzer and have the pairs of peak frequency?and Q numbers for each resonance sent to our control computer.?In doing this, speed is very important to us. Our present system can?measure the f and Q of 6 peaks in 3 seconds. I have a few question relating to what performance we might expect if we?used an HP8753ES with a built-in S-parameter test set:
Thanks for suggestions or help ! |
HP 8447x Series Amplifiers Power Switch
I'm looking for some advice on the 8447x power switches and how to fix them so they operate smoothly.
All these amplifiers use a similar push-button latching power switch and they all seem to have the same problem related to their age - sticky motion when turning on or off. I know I could try using chemicals but I'm hoping someone has specific experience with these amplifiers and what chemicals to use, how to apply and so on. Also, I'm concerned about the long-term effect of the wrong chemicals. Thanks --- Whitham D. Reeve Anchorage, Alaska USA --- |
Re: HP 3400A Upgrade PCBs Available
I've had a good look at the differences between the Rev C & D boards and the pdf manual I bought.
Errors I found in the manual; Parts list, R601 should be 105k (was 174k) and R604 should be 174k (was 105k). The circuit diagram, component layout & boards are correct. Circuit diagram; C10, missing '+' symbol R615, decimal point missing from 61.9R Differences between A6 Rev C and Rev D; R608 was 22.1k, now 21k R609 was 22.1k, now 21k R610 was 2k, now 1.87k R611 was 2k, now 1.87k R616 was 1.21k, now 1.02k R625 was 1M, deleted R627 was 1k, now 500R R629 was 100k, deleted U602 was 1826-0310, now 1826-1381 (LT1012) I haven't been able to verify all the diodes & capacitors, CR601 is not readable and some tantalum capacitors are facing the wrong way (both on my Rev C and Hal's Rev D). I've now completed the Rev D design in KiCAD, I used the Rev C board for location measurements, then adjusted the traces for the Rev D design. Most parts should be obtainable, the 2N4384 transistors seem to be obsolete, but I do have some BCY59X low noise NPN in my spares to try instead, the 1901-0518 Schottky diode I need to find some data for, Molex test point pins have been salvaged from some scrap SA plug-ins. David |
Re: Adding front panel output to 8340B
Physical space might become a problem (depending where you put the attenuator.? HP has a service note covering rear to front "upgrade" that describes changes to a resistor on the ADC board.? You could implement a relay to switch a resistor in parallel with the existing resistor and retain the calibration. (The rear output has more attenuation due to coax length)
I did not do that because I only use the rear output with my 8510 which does not care about the small change in output. Cheers! Bruce |
1741A - Calibration Frequency at 1.6Hz
Greetings, first post.....
I have a 1741A and a couple frequency counters.? Just futzing around while reading the manuals I decide to plug the 1741A calibration posts to the counter. The documented frequency of the 1741A is 1400 Hz. The counters tell me another story, both agreeing to something? like 1611.x Hz, each using the internal clocks as opposed to a shared external time base. On their internal tests the counters are spot-on. There is a volt peak-to-peak adjustment in the 1741A but not a frequency adjustment, even then a +-14% offset just does not make sense. With a slow DMM the output is measured at 0.495v, which seems sort of normal since it is a 50% duty cycle square wave. So, I am thinking that there is something going on inside the scope, i.e. some component(s) on it's way out. Has anyone seen this in a 174x or similar scope? Is this frequency used internally for measurement results and if so what? Any suggestions would be welcome. Cheers, Bert |
Re: 4195A restoration adventure*
¿ªÔÆÌåÓýHi Ruben, ? ??????????????? I would be tempted to look for octal D-flipflop, octal buffer tri-sate first. ? On the image I put the curve corresponding to that of the Spectrum analyzer (image Spectrum), it is certain that the PLL integrator will create a delay, and the shape will be a more or less symmetrical sawtooth depending on the charge pump. So, the waveform I drew will tend to shift to the right if there is more delay in the PLL loop. ? The image on the right would be output J12 of the SUM LOOP PLL. ? Good luck, without an electrical schematic, it won't be easy. ? ? ? De?: [email protected] <[email protected]> De la part de RubenRubio ? Yves, you got point |
Re: 4195A restoration adventure*
¿ªÔÆÌåÓýsorry for the error, sentence to be corrected::? ¡°and this problem would NOT affect other frequencies higher than 266.66... MHz since the MSB is already at 1 normally.¡± ? ? De?: [email protected] <[email protected]> De la part de Yves Tardif ? Hi, ? Just a quick comment that may have nothing to do with your problem. ? You say "The output signal from A18 (rear LOCAL BNC named J2) has to vary between 233.33 and 413.33 MHz. But it starts at 266.x MHz." ? If you look at the image below, it is perhaps just a coincidence, but the fact that the MSB would always be fixed at 1 for example (some defective register), the start freq would then be 266.66... instead of 233.33 ... and this problem will only affect other frequencies higher than 266.66... MHz since the MSB is already at 1 normally. So, in the faulty location, there would be no detection and probably PLL unlock. ? ? Yves ? ? De?: [email protected] <[email protected]> De la part de RubenRubio ? I have retraced my steps to check the signals passing from the upper unit to the lower unit. |
Re: 4195A restoration adventure*
¿ªÔÆÌåÓýHi, ? Just a quick comment that may have nothing to do with your problem. ? You say "The output signal from A18 (rear LOCAL BNC named J2) has to vary between 233.33 and 413.33 MHz. But it starts at 266.x MHz." ? If you look at the image below, it is perhaps just a coincidence, but the fact that the MSB would always be fixed at 1 for example (some defective register), the start freq would then be 266.66... instead of 233.33 ... and this problem will only affect other frequencies higher than 266.66... MHz since the MSB is already at 1 normally. So, in the faulty location, there would be no detection and probably PLL unlock. ? ? Yves ? ? De?: [email protected] <[email protected]> De la part de RubenRubio ? I have retraced my steps to check the signals passing from the upper unit to the lower unit. |
Re: YTO 5086-7080, label interpretation?
Don't worry about those numbers. There's an oscillator and an amplifier stage. The "I" is the desired emitter current, determined by the "R" which are selected to optimize the stage performance for that particular YTO and its transistors. The "R" values are the actual resistors on the support board - you can read them out, and you could estimate the currents too, for diagnosis of problems, but you shouldn't need to. They have nothing to do with the coil currents.
Ed |
Re: Looking for Dual Banana Plug test cables
¿ªÔÆÌåÓýTrue.? I understand there is Star Quad cable for even better balance, at least at audio frequencies.? Never used it myself, though.? Good luck!? ? ? ?Jim? Sent from my T-Mobile 4G LTE Device -------- Original message -------- From: Tom Haynes <tomhaynes.net@...> Date: 11/26/23 12:24 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] Looking for Dual Banana Plug test cables That would produce a shielded dual banana plug cable but it wouldn't be balanced. A balanced shielded cable has 2 twisted signal wires and a shield wire or outer braid. On Sun, Nov 26, 2023, 4:24?PM Jim Ford <james.ford@...> wrote:
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YTO 5086-7080, label interpretation?
On a recent hamfest I acquired a HP YTO 5086-7080. I want to check it out to see if it still works. Google told me this YTO is used in a HP 8558B SA. Also delivered me some manuals for that SA model. |
HP5340A Repair Suspect A22 U9 Schmitt trigger, type 5086-709
Hi Folks, My HP5340A has stopped working at the input to A22 first 2 digits input selector. The U9 Schmitt trigger in a gold can seems to be loading it's input. It is driven by a EECL logic switch which has no output, so I've swapped it with U3 which is an identical switch with the same result, hence my suspicion that is is the next IC that is loading the output. I then tried to simulate an EECL input to U23 output. I think I have damaged this.
My question is are these chips available at a realistic price anywhere or have I now got an HP5340A shelf queen? Any advice would be gratefully received. Thanks. Chris Hayes. Norfolk, UK. |