Thanks, post editedNick wrote:Its max input voltage is 400Vp BTW.
Oh, the thread probably doesn't come across how I intended. I agree completely about the relative cost. I was trying to highlight that the UNI-T scope had a remarkable level of performance for a tiny fraction of the cost of the TDS. I did say that the TDS was still >£5KNick wrote:Not that I mind what scope you get, but you are comparing one scope that the cost of a pair of probes for is more than the cost of the entire other scope (which includes probes, not a great pair, but very usable)
Here's how I read it:
Bandwidth - UTD is lower at 25MHz but this is high enough for audio use - high enough to display any likely oscillation (which I can't do with my analog scope)
Sample rate - UTD is lower at 250MS/s, but this is entirely appropriate for a 25MHz bandwidth and is high enough for audio
Record length - UTD is comfortably better here.
Vertical resolution - UTD is 8-bit, one bit lower than TDS - but 8-bit should be enough. For FFT we should use an audio test set or other equipment that filters out the fundamental and passes the residual onto the scope
Vertical sensitivity - UTD is very close to the TDS, and certainly good enough
Max input voltage - UTD score here with 400Vp cf 150V RMS (212Vp)
Timebase - UTD bottom limit is 20ns/div cf 2ns/div for the TDS. 20ns/div is entirely appropriate for a 25MHz bandwidth - a 25MHz waveform will occupy 2 divisions. So for audio work this isn't a limitation
Display - UTD has a lower resolution display. But it is very usable and helps the scope to be easily portable
Adding everything up and taking into account the remarkably low cost of the UTD it seems like a real bargain. I could stick with my analog CRT scope but for one thing - the FFT. This is such a useful feature that I will have to upgrade. The ability to display oscillation is another big factor in favor of the digital scope.
