The HP 8011A is a 20 Mhz pulse source that can be externally and manually triggered. The Agilent / HP 8012B 50 MHz Pulse Source is a versatile and reliable low-cost pulse generators. It provides a suitable solution to almost all digital logic testing problems. The simple and logical operation, which is achieved by a clearly designed front panel, guarantees rapid familiarization; the risk of setting up incompatible parameters is minimized. This instrument features normal and complement output modes and a switchable internal 50 Ohm source. These features and performance emphasize the cost effectiveness of these models for many applications.