Anritsu MS2692A teardown (26.5GHz signal analyzer)

[d-el]

My vector signal analyzer Anritsu MS2692A:


Brief specs:
- Windows 7 system
- 50Hz-26.5GHz
- 125MHz sampling bandwidth
- Rubidium reference oscillator
- 125MHz-6GHz arbitration vector generator.

I decided to open it for a visual inspection and clean off the dust.
I will note the excellent build quality. Fast, non-glitchy interface, high-end RF characteristics.

I also bought a power meter for it, but it turned out to have a faulty calibration table, more details here:
https://www.eevblog.com/forum/repair/anritsu-ma24106a-repair/msg5853977/#msg5853977

Under the shield:


The device is assembled according to the typical layout for this device. All modules are connected to the motherboard. On the left is a pulse power supply.
To the right of the power supply is a computer module (in my case, this is a Core I5 ​​with 8GB RAM).

Next, the ADC module is installed, in my case with a 125MHz capture bandwidth.


I also have a non-working Anritsu MS2690A and several MS2691A that I serviced and repaired. Therefore, the photos will be combined from all devices.

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Next,  arbitration vector generator module is installed. It has a solid-state discrete output attenuator.

Photo of the generator from my other Anritsu MS2690A:


Solid-state discrete output attenuator:

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Next, the synthesizer module is installed, followed by the YIG driver, Input Attenuator, Input filter, Intermediate filter, Frequency converter.

Photo of this from my other Anritsu MS2690A.

YIG driver:


YIG:

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Photo of this from my other Anritsu MS2690A.

Intermediate Frequency filter and input filter (below):


Assembly:

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Photo of this from my other Anritsu MS2690A.

Frequency converter, side A:


Frequency converter, side B:

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Photo of this from my other Anritsu MS2690A.

Frequency converter, zoomed:

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Photo of this from my other Anritsu MS2690A.

Power Supply, side A:


Power Supply, side B:

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Photo of this from my other Anritsu MS2691A.

Input Attenuator:

[nctnico]

Thanks for sharing! 

[TinLethax]

Thanks for a crisp and clear HD teardown! Always amazed by the RF black magic.

[rvalente]

uow, thats the kind o engineering p*rn I like!

[0837101]

Hi there!
Can you help me, please? I got a problem with MS2960A.
I brought it from calibration at laboratory, and after power on it doesn't display spectrum of input signal, only noise. It looks like RF input "disconnected" from  analyser.
I try to Auto Calibrate (Cal - SIGANA ALL) - and it's failed. What's happen? is this problem may be caused by transportation? Or may be i should "switch" something in menu?
Thanks and best regards!

[d-el]

Was the input signal determined? From a test generator? Can apply deterministic test signal, e.g. 1GHz 0dBm carrier.

Anritsu MS269x have mechanic input attenuator. Some time one or few step is blowed by extra power input signal or mechanic shock. You can manual set attenuator from little to large step by step for check.

If the test signal is not visible against the background noise at all ATT steps, that's a bad sign. Either the YIG has krack or something else has happened.

[0837101]

Thanks for your answer!
Yes, we applied 1GHz from generator. Also we tried to check signal on IF Out on 875/900MHz, but unsuccessfully. I will try your's recomendation!

[d-el]

Check signal after input attenuator, next, after input filter, next, after frequency converter, after IF filter.
I have an almost complete MS2690, I could help with identifying the problem, but there are problems with the delivery of components.