Tektronix PG506 The PG506 Calibration Generator pro

The PG506 Calibration Generator provides three modes of squarewave output, selectable dc outputs, and a variable-amplitude output with front-panel digital indication of oscilloscope deflection error. Simultaneous plus and minus low-level, fast-rise (1.0 ns) squarewaves or high amplitude (60 V), extremely clean squarewaves are available at frequencies from 10Hz through 1MHz for checking oscilloscope transient response.