At 12:54 PM 6/7/97 -0500, you wrote: >At 12:01 PM 6/7/97 -0400, you wrote: >At $995, I think the >>60MHz TDS 210 is the best deal on the market. > >What is the fastest signal you can sample or sweep accurately (<5% >distortion)? >Can you read a 60MHz sine wave in differential mode and get perfect >calibrated amplitude? Have you measured that, or is it in the specs? > >JG > >Still using a Tek 453 (with a little interpretation) in Austin TX > Both the TEK TDS 210 and the TDS 220 have 1 Gigasample/S sample rates, per channel. I don't know about the newer ones, but the earlier Fluke Scopemeters split the sample rate up between both channels. The sample rate was half its single channel rate if both channels were in use. The TEK TDS 200 series scopes display and store 2500 points with 8 bit resolution. It can store two reference waveforms. With an optional $275 (what I paid for it) module it has GPIB, RS232 and Centronics interfaces. Hardcopy looks just like the screen. TEK sells software (I think it was about $300) to interface it to your PC. I haven't tried it yet. I have not tried to measure calibration accuracy in differential mode. It does have the ability to invert either channel or mathematically subtract them. To answer your question, I took a 15KHz, 5VP-P sinewave (all I had handy), activated the differential feature, and got about 0.1VP-P, using the X10 probes that came with the scope. The scope has coarse and fine calibration (user) adjustments. The cursors are automatically corrected to reflect whatever oddball scale factor the user has set up. The scope has an easy to read black on white backlit LCD display. I use the scope in my consulting work. I've had it about 6 month, but I have not had any problems with it. I would like it to scroll like a chart recorder when displaying very low frequencies, like the more expensive ones at work. It just sweeps normally at 5S/div max sweep time.