Electronics/GDS-820S

GW Instek GDS-820S [FAULTY]

• Digital storage oscilloscope (DSO)
• 2 channel
• Bandwidth: Specmanship alert -> Data sheet indicates 150MHz bandwidth but it only has Real Time sample rate: 100MS/s maximum on each channel, Equivalent Time sample rate 25GS/s E.T. maximum on each channel, so not really a 150MHz scope unless you are talking about the equivalent time sample rate on a repetitive signal. You would normally want a sample rate on a scope of about 5-10x the bandwidth. So with a recurring digital signal you can build up a realistic waveform showing timing relationships, though no good for high speed non repetivive waveforms, ie if you have a clock to time a signal against, thats fine, but don't use it on a high speed single signal line. This type of specmanship occurred a lot on scopes of this era.
• 5.7 inch mono LCD (320x240)
• FFT, 125k/CH
• RS232, USB and GPIB
• Trigger DC-30MHz for 0.5div or 5mV, 30MHz to 150MHz 1.5 div or 15mV
• Issues: Faulty needs repair. No power up. Looks like a PSU fault, cannot see any output voltage on 5v lines, haven’t measured the other lines. U2,3,4 appear to have been modified, but still not functioning. The transformer looks like it has suffered from some heating. Not sure if this occurred due the fault of during manufacture.
• Manual: TBD
• Owner: Fligg