Next: Dangers and disadvantages of Up: Low-frequency bias current for Previous: Why is using a Contents
The bias-T circuit is either separately attached to the low-impedance line connecting the pulser and the laser housing, or directly included in the pulser. Connections are different in the two cases:
In this case, the bias-T box is soldered to the top contact of the low-impedance line with the red wire. The black wire (with banana plug) must be connected to the negative pole of the external user supply. The connector labelled IN receives the control voltage (0.6...2.6V, center positive), the connector labelled MONI allows monitoring of the bias current.
The circuit included in the LDD100 pulser unit is controlled by the twisted black and yellow wires of the control cable (with the DSUB-9 plug). They correspond to the shield and center of the IN connector in the former case (positive voltage on yellow wire). This version has no monitor connection.