Re: Looking for 54300A operating and service manual
Apologies, I dropped the right hand end of the schematic off
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I will rescan and post the corrected version later
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Peter
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Re: Looking for 54300A operating and service manual
Take a look at the .pdf file in?
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Files -? A temporary directory for photographs and help relating to emails and posting? - 54300A
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This is the schematic for the input card - it may have what you need
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Peter
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Re: HP 3403C True RMS Voltmeter display fault
Hello Arnaud,
I think there's a few things you may do to locate the source of the problem.
1 - Try operating the 3403C in DC, linear mode. This will bypass all the RMS to DC converter and the LOG circuitry, and will let you measure different DC voltages, positive or negative, and see what value is displayed. Is it always +1 ? This will be a first indication.
2 - Check the voltages which are fed to the LD110 and LD111 : power supplies and reference voltage, and check the clock input.
3 - With a known voltage at the 3403 input (for example +0.5 VDC), check the input voltage on pin 15 of the LD111.
And of course, please let me know !
Sincerely,
Jo?l Setton
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Re: Looking for 54300A operating and service manual
I am specifically looking to use the 54003A input modules
standalone so am looking for the pinout.
There are 6 pins plus a 50 ohm coaxial output.? As there is a
LM308 in there next to the hybrid I could identify the +V and -V
pins, know two are NC and one a ground, so just wonder:
1)? What is the other pin
2)? What are the + and - voltages? (12? 15? or what?)
That's about it.
Peter
On 2/21/2025 9:14 AM, Peter Brown via
groups.io wrote:
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I think that I have it on fiche
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Probe multiplexer Op Svc October 1985 rev 1
Paper part number 54300-90901
Fiche part number 54300-90801
Serial PFX 2510A
2 fiches, includes block diagrams and schematics
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Any particular part of it?
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Peter
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Re: Looking for 54300A operating and service manual
Now, I have read the entire post - I will check to see if there a diagram of the pinout
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Peter
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Re: Looking for 54300A operating and service manual
I think that I have it on fiche
?
Probe multiplexer Op Svc October 1985 rev 1
Paper part number 54300-90901
Fiche part number 54300-90801
Serial PFX 2510A
2 fiches, includes block diagrams and schematics
?
Any particular part of it?
?
Peter
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Re: HP 3403C True RMS Voltmeter display fault
I kept looking up on the LDs chips, on the Tek groups and here with a thread on the 8558. It uses the same duo for the AD converter of its frequency display it seems, with a very similar failure as it was stuck on "+1".? At this point i'll probably blindly replace the pair as they seem to have a high failure rate with time. They seem particularly vunerable to overload, i'll check the power.
I still don't totally understand how the digital section work but I don't think I need to for now.?
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Re: Vintage parts for sale
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From: HP-Agilent-Keysight-equipment@groups.io On Behalf Of jerzy przezdziecki via groups.io
Sent: Friday, February 21, 2025 1:51 PM
To: HP-Agilent-Keysight-equipment@groups.io
Subject: Re: [HP-Agilent-Keysight-equipment] Vintage parts for sale? Hi, I am closing down my father’s long-standing workshop, which specialized in tube and radio technology using components available in the 1970s and 1980s. There are hundreds of germanium diodes, transistors, ceramic tubular capacitors, styroflex capacitors and power resistors—both new and desoldered. There’s a large quantity of these components. If anyone is interested, I can send photos and a detailed description. Best Jurek
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Agilent E5071C Low power both ports, Vernier Leveler E5071-62083, Component IGC1-4213 replacement
In the process of fixing 9 pcs E5071C, I have noted that at least three of them have low output power on both channels (-26 dBm on two, -31 dBm on the third).? I confirmed that the faulty component was the Vernier Leveler and then took this apart to take a look.? It seems like it's always the expensive components that burn out, so I decided to remove IGC1-4213 and bridge the contacts on either side of the component.? Sure enough, the output power went up from -26 dBm to about -9 dBm.? Some limited information about this part is available on the Keysight.? Looks like it's a 11 dB gain power amplifier, so the numbers check out and it looks like this is the failed component.? ?Assuming that they drive it at 9 dBm gain, that would give me the right power at my port (0 dBm nominally).?
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Replacements components appear to be hard to find and expensive (around $500), which is a pretty good indication that failures on this component are common place.? The Keysight page indicates that they sell parts (1GC1-8213) in lots of 10 pcs, so I've put in an inquiry.
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My questions:
1)? Is it possible to get a IGC1-4213 data sheet?
2)? There are some similar component numbers (IGC1-4214, IGC1-8213).? How does one tell which components are compatible and which are not?? Data sheets seem to be unavailable and every time I ask Keysight a question they respond that they're happy to fix it for me, just send them a check for 6K USD.
3)? Of the 9 units, there are two components that have failed and knocked out about 6 of the units.? In other words, two failure mechanisms keep repeating themselves.? Keysight has got to know this.? Why don't they have a service bulletin or something?? Why don't they offer a reasonable repair service for these components which appear to have been designed to fail?? Just a rant I suppose, but I'm not too impressed.? On the plus side, it makes my job easier because once I figure out the failure I just have to apply the same solution over and over again.
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Re: Vintage parts for sale
Hi, I am closing down my father’s long-standing workshop, which specialized in tube and radio technology using components available in the 1970s and 1980s. There are hundreds of germanium diodes, transistors, ceramic tubular capacitors, styroflex capacitors and power resistors—both new and desoldered. There’s a large quantity of these components. If anyone is interested, I can send photos and a detailed description. Best Jurek
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Er, yes. Thanks for that suggestion. I'm afraid such micro-surgery is a bit beyond me at my age!
I think maybe these tests would be better suited to a scalar network analyzer - or just a spectrum analyzer with tracking generator. Esp one of the old analog storage analyzers in fact (giving my age away again).
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Re: VNA Reference Impedance Renormalization
Hi.
Just me, or is there a bit of an inconsistency on page one of
that PDF?
Between the text descriptions and the illustration below,
regarding how to measure Low, Medium and High impedance DUT's.?? I
think the order of the text descriptions and the illustrations are
different.
Also, the first illustration surely is a S11 measurement, not
S21.
Yes, No??? If no, why, in detail please.
73.
Dave 'KBV.
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Re: HP8648A - attenuator glitches
Digging a little deeper into the Service Manual, the output attenuator assy (& Reverse Power Protection- RPP) are quite different between the 1GHz -A and the -B, -C & -D higher frequency models.
For the -A 1GHz model, the attenuator & RPP module is A7 with p/n 08647-61803.
For the -B, C, & D models, the attenuator is A11 with p/n 33222-60011 while the separate RPP module has p/n? 08648-60025.
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Both the -A (1GHz) and B,C,D (2, 3 & 4 GHz) models are shown in the Service Manual drawings as "130dB attenuators in 10dB steps".
The B,C,D models use the 33222 attenuator which uses plungers & O-rings but the -A version possibly uses a simpler attenuator construction (ie no O-rings or plungers) and incorporates the RPP circuitry, so it has a different p/n.?
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UPDATE: it seems the 10dB increments also 'glitch' at the 50 & 60dB settings. I can't hear any mechanical clicks when the attenuator encoder is changed (with the covers on), so do I have a dicky/dirty/ encoder ?? (I'd still like to know how the sub-decade attenuator levels are achieved !? ?The plot thickens.
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Kit
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I suspect what you have there are RF/IF transformer(s)?with tuned primary and untuned secondary.?
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If there is a tap on the primary, the center pin of the three pin side, it is used to feed supply voltage to
the active device.?
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I would remove one side of the primary dog bone cap and take a low frequency?
measure of the primary and secondary inductance values. Get this from a S11 shunt measurement.
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Then while taking? a measurement of the primary inductance (S11), place a short circuit on the secondary side
and re measure the shift in the primary L value, again from S11. The primary L value should decrease and this?
shift in L provides the coupling coefficient. This value obtained from SQRT [(1-L_primary_sc/L_primary_oc)]. Again,
primary L is the measurement, shunt mode, S11.... while the secondary is OC and then SC.?
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Given all this one can ascertain the frequency response analytically with the dog bone C value provided and?
an assumption on the secondary termination Z.?
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Re: Looking for 54300A operating and service manual
Thanks, but that is the operating and programming manual which, as I stated, does not have the information I seek.
Peter
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On 2/20/2025 8:40 PM, scm325 via groups.io wrote:
--------------------------------------------------------------------------------
*From:* HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io> on behalf of Peter Gottlieb via groups.io <hpnpilot@...>
*Sent:* Thursday, February 20, 2025 2:17 PM
*To:* HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io>
*Subject:* [HP-Agilent-Keysight-equipment] Looking for 54300A operating and service manual
Nothing on Keysight, no luck with a web search.? I have the operating
and programming manual but it doesn't help.
What I'm really after is the pinout for the plug in modules as I would
like to use them stand-alone.
Peter
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Re: Looking for 54300A operating and service manual
Sorry about that didn't read Peters entire post.
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From: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io> on behalf of scm325 <Highpwr@...>
Sent: Thursday, February 20, 2025 5:40 PM
To: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io>
Subject: Re: [HP-Agilent-Keysight-equipment] Looking for 54300A operating and service manual
?
From: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io> on behalf of Peter Gottlieb via groups.io <hpnpilot@...>
Sent: Thursday, February 20, 2025 2:17 PM
To: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io>
Subject: [HP-Agilent-Keysight-equipment] Looking for 54300A operating and service manual
?
Nothing on Keysight, no luck with a web search.? I have the operating
and programming manual but it doesn't help.
What I'm really after is the pinout for the plug in modules as I would
like to use them stand-alone.
Peter
|
Re: Looking for 54300A operating and service manual
toggle quoted message
Show quoted text
From: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io> on behalf of Peter Gottlieb via groups.io <hpnpilot@...>
Sent: Thursday, February 20, 2025 2:17 PM
To: HP-Agilent-Keysight-equipment@groups.io <HP-Agilent-Keysight-equipment@groups.io>
Subject: [HP-Agilent-Keysight-equipment] Looking for 54300A operating and service manual
?
Nothing on Keysight, no luck with a web search.? I have the operating
and programming manual but it doesn't help.
What I'm really after is the pinout for the plug in modules as I would
like to use them stand-alone.
Peter
|
Looking for 54300A operating and service manual
Nothing on Keysight, no luck with a web search.? I have the operating and programming manual but it doesn't help.
What I'm really after is the pinout for the plug in modules as I would like to use them stand-alone.
Peter
|
Re: Test Set Program Development Tool DEV_PL on 3.5" floppy
USB floppy drives do not implement a full floppy controller. I’ve never seen one that can handle other than 512 byte sectors, and or sector counts other than those used on MS-DOS 720K and 1.44MB formats. Even there, there is an issue with coercivity on media and head width that create problems with actually using 720K formats.
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As such, you’re going to need a laptop or desktop with an actual internal floppy. (A laptop that uses an external floppy with a 26+ pin cable rather than USB will likely work as well).
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HP 3403C True RMS Voltmeter display fault
Hello,
This is my first post here, thanks for allowing me in. I've had the chance to pick up an HP3403C True RMS voltmeter, serial 1452A03359, with options 0011 (Autoranging) and 006 (dB display).
I bought it with its condition unknown. I know some of the parts inside are absolutely not replaceable but for the price it was a bet I wanted to make.
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So it came in the mail. It must have spent the last few years of its existence in a cellar as it had some slight facia corrosion damage, and absolute STINKS of mold. I have cleaned it thoroughly but it still smells a bit inside.??
The display is stuck on displaying +1V, blinking. If I set the speed to fast it blinks a bit faster. Sometimes it'll display rubbish until the next power off/on again. It seems to react to the switches as the comma moves with the ranges and the dB display also lights up. I have checked the power supply lines (following the procedure), they're good and I can't see much ripple on my oscillo. I'll replace the capacitors of the power supply but only when I know it works as to avoid unnecessary spending.
I have removed all the boards in it (converter and options) only leaving the motherboard, PSU and the display unit and it is still stuck. I therefore believe the issue is not converter related but display related. The display is basically a 3.1/2 digit DVM built around a LD110 (digital processor), LD111 (analog processor) and an SN74LS47N decoder for the displays. , and
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I'm quite the beginner and lack some diagnostics knowledge. The display is also a rather convoluted assembly. Considering the high humidity storage it went through I suppose solder corrosion is not out of the question. I have already cleaned what I could (the boards were all perfect thought) and the gold plated connectors (also perfect) with isoprop.?
What would be your recommendations on what to try next?
Thanks everyone,
Arnaud.
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Jinxie
Kit