SPECIFICATIONS This manual includes instructions for the T921, T922 and T922R portable oscilloscopes. The T922 is a 15 MHz, dual trace, oscilloscope and the T921 is a 15 MHz, single trace oscilloscope. The Vertical Amplifier, either single trace or dual trace, provides calibrated deflection factors from 2 mV to 10 V/div. The Time Base provides stable triggering over the full bandwidth of the Vertical Amplifier(s) and provides calibrated sweep rates from 0.5 s/div to 0.2 //s/div. A variable X1 to X10 magnifier extends the maximum sweep rate to 20 ns/div. The T992R is a rackmount verison of the T922 oscilloscope which takes 5-1/4 inches of rack space. Features added to the rackmount version include: single sweep; rear panel outputs for Sweep Gate, Sweep Ramp, and Vertical Signal; internally selectable Z Axis polarity; user selection of the CHOP or ALT dual trace modes; and switch-selectable front-panel or rear-panel inputs for CH 1, CH 2, and EXT TRIG signals.