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Just got in a TinyPFA. Hopefully I can get some more data on the GPSDO and other OCXOs that I have. Any setups for the TinyPFA that can help with the learning curve would be appreciated. ed

I'm at the stage now where I'm going to need to improve the test setup. This means using a sig gen with lower harmonic distortion and also using external levelling using a thermocouple power meter.

Thanks. I'm not sure what device will be most vulnerable when connecting the probe tip to +/- 50V DC. There will be a large transient generated via the 150pF input blocking capacitor and it might

Did HP ever produce the troubleshooting guide for the 3336A/B/C that was promised in the service manual dated October 1979? -- Joe White KW4YW

I've downloaded and deleted these. As mentioned in my other message, as soon as we straighten out the file size disparity I will zip and re-upload them. I've also created a subdirectory for the

Signature modes, etc are all "standard EPROM stuff" and is really muddying the waters here. Any reasonable device programmer will handle all of this automatically, i.e. when you select a specific

The following files and folders have been uploaded to the Files area of the [email protected] group. * /3852A-Firmware/3852A-ROM-upgrade-v4.2-Sep89.pdf (

FYI, I've deleted those files but I have them here, I'll re-upload them as a zip file when we straighten this out. A 27512 is a 64KB device! -Dave -- Dave McGuire, AK4HZ New

Waitaminute. The files Rick just uploaded (which I am in the process of cleaning up and repackaging) are all 32KB images. What's up with this? ra$ ls -lh total 649K -rw-r--r-- 1 mcguire mcguire

This confirms my findings. The issue is that the V4.22 Rom images are all 32k to fit into 27c256 but U57 and U58 need to be 64k. V4.21 are all 64k.

Hi Rick, this appears to be the same document, though an earlier revision, that has been floating around for a long time. Why is it split into two parts? -Dave -- Dave McGuire,

The following files and folders have been uploaded to the Files area of the [email protected] group. * /HP3852A ROM kit Ver 4_200 Part 1.pdf (

The following files and folders have been uploaded to the Files area of the [email protected] group. * /HP3852A ROM kit Ver 4_200 Part 2.pdf (

The following files and folders have been uploaded to the Files area of the [email protected] group. * /Hp 3852a v4.22 Rom set rick/U57_Rev422.hex (

I'm considering using one for a project at the museum. A work project, not an exhibit; it will be doing real work in the restoration area. They are great little machines for automating real-world

At the end I want to have a good image of V4.22 posted in the file section so people can use it in the future without issues.? I don't think a lot of people will ever update these units but why not

Here is the unit running on the V4.21 with 27C512 chips on all positions (the images provided are all the same size 64k). No error messages with V4.21.? But cannot boot on V4.22. Maciej

Here is the HP? modification instruction : Here is the difference between the 27C512 and 27C256. Notice the extra address line A15.? HP makes us connect that pin to the RP4 which is probably the

Dave In my opinion the issue is that some of the roms after 4.0 became 27c512 . That is why there is a need for added modifications via wires to the U57 and U58. The roms in version v4.22 are all 32k

I've been able to solder wire-wrap wire to SOT-23 packages with the aid of a magnifying headband. Recently I replaced burnt-out diodes in my HP 400D AC Voltmeter with BAT62's. Dave