With the toggle switch in the 1. 5 V position, E C L compatible logic levels into 50 OHm are available. The base line is -0. 5 V, and the pulse top is - 1. 5 V.

2.2. 11 POS OUT
The positive output connector and controls pro- vide an adjustable positive output level with NORMAL or COMPLEMENTARY pulse oper- ation. An AMPLITUDE control allows the pulse top level to vary from +O. 5 V to +5 V. The AMPLITUDE control is an attenuator that should operate into 50 Ohm in order to provide the 10:1 amplitude control.

A NORM/COMPL toggle switch provides either NORMAL or COMPLEMENTARY pulse oper- ation. In the NORMAL pulse mode, the output pulse is at a high level for the duration of the pulse width and has a base line of about 0 V. In the COMPLEMENTARY mode, the pulse is near 0 V for the duration of the pulse width and at the adjustable high level at all other times. In the COMPLEMENTARY mode, duty factors larger than 90% can be obtained.