I am not certain about correctly connecting scope probes to the output of differential ECL components. The board I'm looking at uses PECL (+5V Vcc, 0V Vee), and I don't have any special probes to use with my Tektronix TDS 3054. Any tips on how to do this would be greatly appreciated! I doubt that it makes any difference, but the specific devices are 100k ECL (e.g., MC100EL34, MC100EP195).