(SOLD) HP 3589A 10Hz-150MHz Network analyzer - Page 1
Forum section: electronics / general

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 09, 2019, 08:35:51 am
content: For sale is a HP spectrum/network analyzer, goes from 10Hz to 150MHz, tested and working and very good condition. Great for filters and frequency response of capacitors and inductors.-This unit has the ovenized oscillator option-Screen green is very bright-50Ohm and 1MOhm inputs-data readable by GPIBDifficult to find this unit in Europe, very useful for low frequency work where most spectrum analyzers don’t reach.I include a USB stick with:-operating and service manuals-Schematics of all boards (this is not found online)Pictures show some tests, and a 5KHz 4th order buterworth filter response and response of a 150uH inductor.

author: Zucca
author_rank: Unknown
timestamp: December 09, 2019, 08:53:10 am
content: Nice one! Unfortunately I need the money for something else.

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: December 09, 2019, 10:43:28 am
content: Damn... I would love to have that. You don't happen to accept monthly installment deposits?

author: toastedcrumpets
author_rank: Regular Contributor
timestamp: December 09, 2019, 11:16:14 am
content: Can I ask, why are these low-frequency analysers so expensive? Its like the audio analyzers, thousands for even really old units. Can't they be replaced with a Sig-gen and oscilloscope? Do they have particularly high drive currents/voltages or something?

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 09, 2019, 11:57:00 am
content: Quote from: toastedcrumpets on December 09, 2019, 11:16:14 amI don't think this unit is that expensive considered that it is tested, in good condition and here in Europe. Bring it from the US and pay taxes+shipping, and there they are not that cheap either. Again a Omicron Bode 100 is limited to 50MHz and costs 4000€+, although the omicron has the s-parameters, this one needs an accesory for that.QuoteFor just audio get a good PC audio spec analyzer, its nonsense to buy an old spec analyzer for audio use.QuoteNo. This is a network analyzer, not only a spec analyzer. The phase information, accuracy, flatness in response and low noise that you get with this unit can't be obtained with an oscilloscope. Just the Log-sweep is not doable with an oscilloscope.

author: Pitrsek
author_rank: Regular Contributor
timestamp: December 09, 2019, 12:09:42 pm
content: Can you measure feedback loop stability with it(with injection via transformer)? From a quick glance it seems that signal generator is coupled to one of the detectors.

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 09, 2019, 12:22:06 pm
content: Yes, the source is internally coupled. The HP 35665A has both CHA and CHB available although limited to 100kHZ. Not sure if by separately analysing the coupling transformer and the feedback network output significant results could be obtained...

author: Sighound36
author_rank: Frequent Contributor
timestamp: December 13, 2019, 02:59:32 pm
content: Hi MastertechDoes this unit have a FFT sweep?

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 13, 2019, 04:39:10 pm
content: Quote from: Sighound36 on December 13, 2019, 02:59:32 pmGood point that I forgot to mention.Yes for spans less than 40kHz, see attached. This unit uses digital IF filters and for normal spectrum measurements it does oversweep which results in much faster results.However since sweep time increases with decreasing resolution bandwidth this unit does FFT analysis for small spans.

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 13, 2019, 04:54:49 pm
content: Here is a pic of a narrowband measurement, 100kHz modulated waveform, very fast update indeed.

author: Sighound36
author_rank: Frequent Contributor
timestamp: December 13, 2019, 05:06:50 pm
content: Thank you Mastertechoddly enough apart from the impedance measurements it was audio I was looking to use this for as my SA's start much higher up the frequency spectrum.So for looking at the sub 120Khz region this maybe a good option?

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 13, 2019, 05:14:11 pm
content: Unfortunately there are not many spec analyzers that can go below 10-100kHz let alone network analyzers, although this band is very useful sometimes.For just spec analysis below 100kHz there is the HP 3561A which is of the "dynamic" kind but it is much more limited than this one, no network analysis and no RF range.

author: Sighound36
author_rank: Frequent Contributor
timestamp: December 13, 2019, 05:57:08 pm
content: I agree that was the conclusion I came to, with the 3561A but it is limited to 100Khz.One of these available 3561A in the UK, but as you say the unit you have is pretty rare can I ask what you replaced it with?

author: philipz
author_rank: Contributor
timestamp: December 14, 2019, 07:44:12 pm
content: Here is the full specification of device

author: Saskia
author_rank: Super Contributor
timestamp: December 17, 2019, 08:36:59 pm
content: I just might be crazy enough to be interested. Where are you located ?

author: Saskia
author_rank: Super Contributor
timestamp: December 17, 2019, 10:03:54 pm
content: no offense or insult intended. I need the lower frequency range, but shipping might be a major pain in the rear. Which is why I am asking about your whereabouts.

author: krasnopol
author_rank: Contributor
timestamp: December 10, 2021, 11:28:14 am
content: Hi, I own a 3589A with some problems on the A11 input card. Would it be possible to send me the schematics ? I own the 3588A schematics scanned by Atkek but the A11 board is different. Best regards.

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 10, 2021, 11:35:58 am
content: Hi, I also have the 3588 schematics, and I believe that except for the logic board, the rest of the boards are the same.The most probable cause of fault in that board are the relays, I too had a faulty one. That said overall is not that difficult to troubleshoot that board, given that you make you own extension cable so you can power it without it being plugged.

author: krasnopol
author_rank: Contributor
timestamp: December 10, 2021, 06:57:10 pm
content: Hi, I disagree about the boards. I have both A11 boards for the my 3589A and a 3588A sold as spare and there is a subtle difference between them : the 3589A one has a separate 1 Mohm attenuator which is not included in the 3588A one.When I put the 3588A board in my 3589A, the full tests display an error about the 1 Mohm attenuator (it is advertized as six times 0 dB) but no error about the 50 ohms one (advertized as 0 dB, 10 db... 50 dB). And there is another FAIL test : receiver autorange. In level measurements, all is OK in the 50 ohms mode but values are totally wrong above 0.4 Vrms in the 1 Mohm mode.My 3589A original board doesn't work at all in 50 ohms mode. Levels increase with the frequency but are very very low so I suspect a problem with a capacitor. In 1 Mohm mode, things are better. But there are three other FAIL tests : receiver 2nd IF, receiver adc and post divider.Any idea about my 3589A A11 problem ?

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 16, 2021, 03:19:04 pm
content: I recall that A11 was the same for the 88 and for 89, I also had both equipments at one time. It has a 1Mohm input buffer, and both equipments are the same specwise in that sense. Attached schematicAnyway, I believe I had a bad relay in one A11.But if the spectrum you get is not even, low below a certain frequency and correct after that, then probably you have a bad A12, I'd say this board fails a lot in this equipment and most errors you get will be due to this board. I tried to troubleshoot a faulty A12 in my 3589 and even replaced most components on it and wasn't able to repair it. The mixer I couldn't find so this one remains a possible culprit. I remember that using cold spray on the board improved things and even removed the initial auto cal error at startup.Eventually I found a good A12 board on ebay and was able to fix it.

author: krasnopol
author_rank: Contributor
timestamp: December 22, 2021, 10:54:53 am
content: Hi,I have done some experiments in the network measurement mode. With 50 ohms input, signal is very low at low frequency and it increase gradually with frequency, as if the signal travels within a very small capacity. All seem to be a defective relay within A11 which remains open. I have just received two connectors in order to build an extender board for A11.Regards.Edmond

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 22, 2021, 11:57:42 am
content: That points to a fault in A12 anyway. An open relay does not behave like a capacitor for such low frequencies (150MHz...)I did the same, solder 2 connectors with a lot of wires to connect the boards outside.Anyway for A11 you can take the signal out of the output cable on top directly, to test the whole board, so you don't really need an extender.

author: krasnopol
author_rank: Contributor
timestamp: December 22, 2021, 12:33:35 pm
content: I have change the A12 with another one and I have exactly the same results. Moreover, when I do a logarithmic sweep, the level increase linearly from -85 dBm at 100 kHz to -45 dBm at 10 Mhz. This is exactly 20 dB/decade, like a small serie capacitor.Regards.Edmond

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 22, 2021, 01:48:33 pm
content: If that is the case you are lucky cause repairing the A11 is simple...