Working perfectly. Guaranteed by 6 months right of return, and 1 year repair/exchange warranty if back up unit still available.
TDS 400, 500, 600 often have electrolytic capacitors leaked at this age.
Regardless of whether they function well and pass the tests, they must be recapped and washed like this unit listed or it's a ticking timebomb.
Once you see Acq++ fail, chances are the electrolyte has eaten into the board traces and it's gone for good.
I recapped all SMD electrolytic capacitors on Acq and main board and washed them throughly so you won't regret buying it after running it for a couple of months.
You can return in 6 months for ANY REASON as long as you pay for shipping both ways.
If it fails with a year of purchase, I can repair or replace it for free and will pay for all associated shipping costs. If I cannot fix it, I'll gladly refund.
This has built-in GPIB interface for communication to computer. Passes all self-tests (including Signal Path Compensation, SPC).
Specs (copied from http://www.testequipmentconnection.com/1080/Tektronix_TDS540.php):
Bandwidth: dc to 500 MHz
Sweep speed: 20 s/div to 100 ps/div
Vertical Sensitivity: 1 mV/div to 10 V/div
4 input channels
Sample rate: 1 GSa/s
Sweep speed: 5 s/div to 500 ps/div
BNC(f) input connectors
1 megohm or 50 ohm input impedance