Keysight (Agilent/HP) 8011A

Frequency range 0.1 Hz to 20 MHz. Positive, negative, or symmetrical output signals. Pulse width adjustable from 25 ns to 100 ms. Maximum output voltage 16 V, controllable via built-in attenuator. Input impedance switchable to 50 ohms or high impedance. PULSE GENERATOR 0.1 Hz - 20 MHz