User`s guide

Agilent 4155C/4156C Users Guide Vol.2, Edition 6 7-17
Measurement Units and Functions
Measurement Units
VSU - Voltage Source Unit
Figure 7-6 shows a simplified VSU circuit diagram.
Figure 7-6 Simplified VSU Circuit Diagram
VSU can force up to ±20 V with 1 mV resolution.
Only range available is 20 V range, so output range is automatically set to 20 V.
Current compliance is automatically set to ±100 mA.