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Re: HP-182C repair
Hello again Erich,
On 9/28/09, erich_schlecht <schlechtca@...> wrote: I may not be much help -- my 182T might be different than the 182C you have.the tube is the same I think. Two pins coming from the top have wires going to the horizontal deflectionyes, that's what I see on the horizontal plates too. I see from the schematic, I'll try troubleshoot the two align circuits. yes, I know, what I get is a curved and distorted trace, just like the one I get with manual turning the horizontal knob. hmmm if that's the case it would be inside the unit, I moved it a lot and tried in different positions just to probe various boards. By the way, the bad focusing gets even worse when the unit is laid on a side. Also turning the scale flooding trimmer for maximum illumination shows a strange bright "spider-web" like pattern on the lower right corner of the CRT. I believe this shouldn't happen. thanks again and best regards. Frank |
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Power sensor calibration system
ruben_rock
Hi all,
My lab was audited recently by an ISO auditors. I have some old units with me in which i use to calibrate the older version of sensors but now after getting audited by these people , i learnt that i have been making calibrations with wrong instruments. I would be much obliged if i can get some suggestion on the instruments that i should have for the calibration of power sensors. I need to suggest some instruments and i would appreciate getting some info through this group. If i wish to clean the connectors be it the sma or the N type..can i use an alcohol based solution? Appreciate the help and reply. I wish to also get a suggestion on how to make accurate frequency measurements using a microwave counter. I have been using A HP5351 unit to do it till it got faulty and ever since, i have been using the 8563E to make my microwave freq measurements. Am i doing it right? How do i calculate the freq uncertainty using the analyzer with an external GPS unit? Rgds Ruben |
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Re: Options for CISPR 25 EMI Test Instrument ?
Hi Mark,
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For conducted emissions tests, you will probably use a LISN. The most important piece of equipment you will need is a 11947A to protect the analyzer from tarnsients. Without it, you will very likely damage the analyzer. Vladan --- In hp_agilent_equipment@..., "mark@..." <mark@...> wrote:
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Re: HP8568B Error Correction Routine failure
It could be either. There is a good way to check. Set up the analyzer like John said to view the calibrator. Then, use the "shift-q" (that's a small "q") function which will disable the IF step gain switching.
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Now push the "atten" key and step the attenuation up, 10 dB at a time. (20,30, etc.) Every time you do that, the calibrator peak should drop by 10 dB. If the drop is significantly different from 10dB, the problem is with the attenuator. Vladan --- In hp_agilent_equipment@..., STEVE REEVES <steve_reeves@...> wrote:
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Re: HP8568B Error Correction Routine failure
STEVE REEVES
Looks like a bad 20 dB element in the RF step attenuator ( It has 3 sections: 10, 20 and 40 dB for a total of 70 dB).
Steve ________________________________ From: John Miles <jmiles@...> To: hp_agilent_equipment@... Sent: Sunday, September 27, 2009 6:45:26 PM Subject: RE: [hp_agilent_equipment] Re: HP8568B Error Correction Routine failure ? It does :-(Because the error is small, it really sounds to me like an IF gain problem rather than a bad attenuator element. I would try to go through the IF calibration procedure in the display section service manual, and look for signs of the problem there. For instance, assume the 8568's attenuator has 10, 20, and 30 dB sections. (I'm not sure what they actually are, offhand.) For RF ATTEN settings that require a 20-dB pad to be switched in, a corresponding 20-dB amplifier stage has to be enabled to keep the reference level constant. If the gain of that stage is a couple dB off, that would explain what you're seeing. Ideally you could rule out the RF attenuator by observing the amplitude at the input to the IF section with another receiver or analyzer as you go through the 10 dB steps. (Another way to do that is to substitute the output of a calibrated signal generator for the RF section's IF output.) -- john, KE5FX |
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Re: HP8568B Error Correction Routine failure
STEVE REEVES
Did you try adjusting the front panel AMPLITUDE CAL on the RF section for -10.00 dBm on the display while viewing recall 8 ? Does it have enough adjustment range above and below - 10 dBm?
Steve ________________________________ From: John Miles <jmiles@...> To: hp_agilent_equipment@... Sent: Sunday, September 27, 2009 3:29:37 PM Subject: RE: [hp_agilent_equipment] HP8568B Error Correction Routine failure ? No, it doesn't have anything to do with the 2nd LO. There's a gain-adjustment stage that isn't responding properly somewhere -- either in the IF amp section, or in the RF attenuator itself. Try putting the calibrator onscreen (CF 20 MHz, SPAN 100 kHz, REF LEVEL -10 dBm) and hitting the up and down arrows to step the RF ATTEN setting from 10 to 70 dB. The calibrator's amplitude shouldn't vary more than a dB at any point. If it does, then that is probably what's causing the self-cal to fail. If it remains steady at all RF attenuator settings, look for the problem in the IF gain-step control circuits in the display section. -- john, KE5FX -----Original Message----- [Non-text portions of this message have been removed] |
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Re: replacement for transistor 1854-0232
Hello,
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The following web site () show that the 1854-0232 is a 2N3440. Good luck. Victor --- On Sun, 9/27/09, fredschneider2001 <fredschneider@...> wrote:
From: fredschneider2001 <fredschneider@...> Subject: [hp_agilent_equipment] replacement for transistor 1854-0232 To: hp_agilent_equipment@... Date: Sunday, September 27, 2009, 7:15 PM ? Does someone has the equivalent for the 1854-0232 transistor. It is in the 178V powersupply of a 5326 nixie counter. Now my nixie are at 217V and I do not like that thought ;-) This is the last fault in this counter. The rest I solved. I have some cross reference lists but this one is not in there. Fred [Non-text portions of this message have been removed] |
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Options for CISPR 25 EMI Test Instrument ?
I need to do CISPR 25 conducted emissions tests and
would like to leverage the equipment I have. That list includes HP 8590A(with HPIB opt) and 8568B. These are the most modern spectrum analyzers I own. Neither of these have the EMI test options (H51 and 462 respectively) but I'm doubtful that the 8590A option was ever intended to be used for CISPR tests anyway. Is the 8590A capable of doing those tests? If so, where would I acquire the software to enable that? If it can but there is no software, any recommendations of language and template to leverage to write it? And if so, where do I find the procedure for adjusting the 8590A for impulse bandwidths? Last, what other instruments would I need to complement? Next, if I'm barking up the proverbial wrong tree with the 8590A, my next hope would be to use the 8568B. But, as it is not already an option 462 where do I find the procedure to make it so? I also understand that to do these tests per original HP system, I need a 85650A Quasi-Peak Detector, an appropriate computer platform and some software akin to, if not the HP 85864(?) or 85869(?) to automate the needed tests. Does anyone have leads for a reasonably priced source for those? I might consider acquiring an 859XB and the appropriate personality card(s) or other brands or (considering CISPR 25 only tests 150 KHz to 108 MHz) lower frequency range instruments to do these tests if anyone has a reasonable suggestion. TIA, Mark Hawk |
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replacement for transistor 1854-0232
Does someone has the equivalent for the 1854-0232 transistor. It is in the 178V powersupply of a 5326 nixie counter. Now my nixie are at 217V and I do not like that thought ;-) This is the last fault in this counter. The rest I solved. I have some cross reference lists but this one is not in there.
Fred |
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Re: HP8568B Error Correction Routine failure
John Miles
It does :-(Because the error is small, it really sounds to me like an IF gain problem rather than a bad attenuator element. I would try to go through the IF calibration procedure in the display section service manual, and look for signs of the problem there. For instance, assume the 8568's attenuator has 10, 20, and 30 dB sections. (I'm not sure what they actually are, offhand.) For RF ATTEN settings that require a 20-dB pad to be switched in, a corresponding 20-dB amplifier stage has to be enabled to keep the reference level constant. If the gain of that stage is a couple dB off, that would explain what you're seeing. Ideally you could rule out the RF attenuator by observing the amplitude at the input to the IF section with another receiver or analyzer as you go through the 10 dB steps. (Another way to do that is to substitute the output of a calibrated signal generator for the RF section's IF output.) -- john, KE5FX |
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Re: HP-182C repair
I may not be much help -- my 182T might be different than the 182C you have.
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In mine, the tube has three pins/wires coming out of the bottom; they are the vertical deflection and mesh (focus) pins and go to a board below the tube. The two vertical wires go to a gray cable and down to the plug in board in the rear. Two pins coming from the top have wires going to the horizontal deflection amp on the right side (looking at the front). When the beam is centered, those two have zero volts between them, when the beam is on the side they are about 48 Volts. Three pins coming out the side are the flood (graticule illuminator), not related to your problem. They also go to the board below the tube. There are two compensation circuits, trace align and y-align that go to metal rings around the tube. If either of those circuits were not working (especially the trace align) you might have a problem. They don't use the vertical plates, they are magnetic coils. By the way, you can get a horizontal line (rather than just a dot) by injecting a signal of 100 to 500 Hz or so into the external input. That might help. The only other thing I can think of is that something magnetic (or accidentally magnetized) is near your unit. It would have to be really strong, though! Erich --- In hp_agilent_equipment@..., francesco messineo <francesco.messineo@...> wrote:
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Re: HP8568B Error Correction Routine failure
--- In hp_agilent_equipment@..., "John Miles" <jmiles@...> wrote:
It does :-( CF 20 MHz SPAN 100 kHz RBW 1 kHz VBW 1 kHz REF LEVEL -10dBm ATTEN 10 dB --> Peak at -10.60 dBm ATTEN 20 dB --> Peak at - 7.70 dBm(out screen) ATTEN 30 dB --> Peak at - 7.00 dBm(out screen) ATTEN 40 dB --> Peak at -10.90 dBm ATTEN 50 dB --> Peak at -10.90 dBm ATTEN 60 dB --> Peak at - 7.70 dBm(out screen) ATTEN 70 dB --> Peak at - 7.70 dBm(out screen) Can I do anything to fix the problem ? Art IK7JWY |
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Re: HP8568B Error Correction Routine failure
John Miles
No, it doesn't have anything to do with the 2nd LO. There's a
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gain-adjustment stage that isn't responding properly somewhere -- either in the IF amp section, or in the RF attenuator itself. Try putting the calibrator onscreen (CF 20 MHz, SPAN 100 kHz, REF LEVEL -10 dBm) and hitting the up and down arrows to step the RF ATTEN setting from 10 to 70 dB. The calibrator's amplitude shouldn't vary more than a dB at any point. If it does, then that is probably what's causing the self-cal to fail. If it remains steady at all RF attenuator settings, look for the problem in the IF gain-step control circuits in the display section. -- john, KE5FX -----Original Message----- |
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Re: HP8568B Error Correction Routine failure
Jim Popwell Jr
it looks as if the analyzer is telling you to adjust the 2nd local
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oscillator amplitude down a little to bring it into a range where the autocal routine can handle it... check the 2nd lo cal section in your manual jim On Sep 27, 2009, at 11:46 AM, ik7jwy wrote:
HI, |
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HP8568B Error Correction Routine failure
HI,
yesterday I discovered this trouble on my HP8568B spectrum analyzer. When I put ON the S.A. everything works fine , the two red leds INSTR CHECK light for a while, then come back OFF. No error message on the display. I perform the two routines RECALL REG 8 and RECALL REG 9 and everything continues to sounds good. But, when I go to the Error Correction Routine (SHIFT+W) then I see the failure. At the end of the routine I see on the display this message "ADJUST AMPTD CAL", instead of "COOR'D", and all the parameters (RBW, REF Level and so on) don't come back to the Preset. You can see here what happens: If I start again the routine, at the end I get the same result. Any idea ? Thanks. Art IK7JWY |
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Re: HP-182C repair
Hello Erich,
first of all thanks for the answer! On 9/27/09, erich_schlecht <schlechtca@...> wrote: Frank,yes, it happened on some other scopes, but I did check all the high-voltage resistors and they seem in the correct tolerance range. Also focus, cathode, grid voltages look normal. You may have tried this, but it sounds like the signals are feeding backAll low voltage supply are dead stable while I move all controls. I checked also the vertical plate voltage with no plugin on the connections on the lateral slide of the mainframe (green and white wires). They always both remain at 0V no matter how I set controls. Of course when connecting the multimeter probe to those contacts I see a little vertical deflection due to noise coupled with the plates. Distortion is always there. I'm not saying it's not the CRT, just that it doesn't really sound like itI really whish it isn't the CRT, that's probably the only thing not worth fixing in a mainframe like this :/ Thanks again, I guess I need more hints now. I don't really know where to poke around looking for electronic faults. Frank IZ8DWF |
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Re: HP-182C repair
Frank,
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These things often have several to many bad resistors in the high-voltage sections, which includes the deflection amplifiers, focusing and intensity section and power supplies. You may have tried this, but it sounds like the signals are feeding back through the power supplies, maybe the 100 volt? Have you checked these voltages, especially while adjusting the controls that cause the symptoms. I would start with the horizontal control causing a curved trace. Check the voltages on the power supplies as you move the control. Also see if the vertical plate voltages change as you rotate the horizontal control. I'm not saying it's not the CRT, just that it doesn't really sound like it to me, and it's worth trying the other cheap things first. Erich --- In hp_agilent_equipment@..., francesco messineo <francesco.messineo@...> wrote:
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