Disregard my post above as it has become obvious to me from Ed's post about exceeding the lower limits of the spectrum analyzer that source impedance is important when running low frequencies

Thanks Chuck and Jim, These are very valuable points, specially around DC block and co-ax cables. Any comments /suggestion about using fast acting lowest current pico fuses (sub miniature ) as an

Not sure why the 100 Hz low end, but I  did take my 8566A down that low a couple months ago just to see what it would do.   Lots of 1/f noise!  I would use my Stanford Research Systems SR780 FFT

Good points, Chuck.It's a good habit to discharge coax cables that have been lying or hanging around for a while before connecting them to ESD sensitive equipment.  Obviously if you have just been

You also have to worry about plain old component failure. RF amplifiers are typically capacitor-coupled, and relatively safe DC-wise - unless the output cap shorts out, for instance. Then the DC from

My 2215 stopped working. At first I thought it was the power switch but that isn't the case. The manual shows an inductor off the power circuit board but mine doesn't have that. It has an FET

Here is a thought, for example a HP 8566 which can go down to 100 Hz. I assume they choose that number as that is the lowest it can go for certified performance, but I wonder if they choose that

I worked on the 420x firmware. I don't remember the mechanical details except that the connector for the Option CX board (which I did) is not on the bottom at all; Option CX is vertically mounted in

Often, a DC block isn't insurance at all. Every DC block I have met is simply a series capacitor, usually about 0.1uf... those for lower frequency SA's, can be several uf, so as to not degrade the

Unless you have a need to go into the LF region, a DC blocking accessory is cheap insurance.

Most obvious when compared to letter scopes: B has: Parallel port DC OUT on different location Cal switch and GND terminal are the same Ethernet port EXT Trig connector on 4 CH scopes C has:

Great answer, thanks

Can the supply be run while removed and disconnected from the analyzer? A cap could have failed after being installed and used for a few minutes. I'd wonder what the voltages are without the

For transistors and 2 leg components etc definitely work from the component side. way too much trouble otherwise. Cutting leads may be a good idea before pulling or maybe tacking to existing leads.

I agree with you, and that's why I feel helpless about this situation. All voltages measured ok after I replaced those caps and the power supply was disconnected from the equipment..

I recently purchased a TDS3034 with a case that is in worse condition than anticipated: The rims on the feet assemblies and the rear cover are damaged, the front part is OK. I've decided to start

Does anyone know if the processor board located in the bottom of the 4205 CRT Display easily slides out through the rear? Also, are the ROMs located on this processor circuit board? Unfortunately,

DC is just 0 Hz - there's no need to worry about the DC level if it's within the power input rating. If an SA is rated for operation to 0 Hz (DC-coupled), then it is typically for a wide bandwidth

I don't see how loading down the 300 VDC supply to 245 would in anyway increase the 100 volt supply by 45 volts. I think you'd better look for an unwanted leakage path between the 100 and 300 volt

David Holland wrote on 5/27/2019 7:16 PM: <Gory details snipped> Hello, David and the group-- My thanks go to all who responded, and I hope that all of the good advice reaches the archives to help