Products > Test Equipment

Has anybody enabled Tracking Gen on Agilent N9340B?

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nexus:
Roger. Thank you for this info!
Will have an update in the coming weeks once I get the analyzer in hand and have a poke around.

nexus:
Good news. My n9344c came in the mail today. It's seen some love in the field but nothing drastic from the outside.

I bought a new AC/DC 15 volt adapter straight from Keysight so attached the plug pack to my AC6801 ac supply (for safety when attaching unknown analyzer). Plugged in the N9344C and immediately the plug pack went into protect mode, trying to start up every few seconds but cutting out.

So power problem straight away. Measured resistance across barrel jack and under 2 ohms center to shield. Definite problem.

So begin teardown to digital motherboard where barrel jack is mounted. Nothing looks burnt, but there is basically a short on DC input.

Ok, so whip out the thermal camera and hook up programmable psu to barrel jack. 2 volts, 0.1 amps and keep increasing in 0.1 amp steps. At 0.3 amps, the culprit tantalum cap begins to get warm. Found ya!

Took the failed tant off (thank god it didn't explode and ruin the board). Reassembled temporarily and plugged in. Analyzer powers on and sweeps with no errors! Do a firmware update, no problem. It's working with no issues to be seen. Need to test with signal gen but will first clean (a little crusty on the inside too) and replace removed tant. Bought the serial header so we will definitely try to get that preamp option enabled!

Mallocated:
Good skills.  If you still have the case open, any chance you could post some photos of the GPS module and any identifiers?  Wondering if it's Agilent branded or an off-the-shelf product. I've fitted a generic GPS module to my N9342C and got it working with a firmware modification, but the instrument timebase calibration from GPS PPS output is still no go.  Thanks. 

Mallocated:
This might help with troubleshooting the DC input and protection circuit....

nexus:
No problem. Here are some pics. There is only one marking on the board under a sticker, hopefully it can be identified.

I know agilent had some good block diagrams for their equipment back in the day. Nice to have an actual schematic too! Is that snip out of a service manual for an N93XX somewhere online?

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