Keysight E3631A, Service Manual

Page: 44 / 131

2 Quick Start
42 Keysight E3631A Service Guide
To use the power supply in track mode
The +/–25V supplies provide 0 to +/–25 V tracking outputs. In the track mode,
two voltages of the +/–25V supplies track each other to /–(0.2% of output
+ 20 mV) for convenience in varying the symmetrical voltages needed by
operational amplifiers and other circuits using balanced positive and negative
inputs.
To operate the power supply in the track mode, proceed as follows:
1 Set the +25V supply to the desired voltage as described in previous section "To
use the power supply in constant voltage mode" (see page 38 for detailed
information).
2 Enable the track mode.
The key must be depressed for at least 1 second to enable the track mode.
When the track mode is first enabled, the –25V supply will be set to the same
voltage level as the +25V supply. Once enabled, any change of the voltage
level in either the +25V supply or the –25V supply will be reflected in other
supply. The current limit is independently set for each of the +25V or the –25V
supply and is not affected by the track mode.
3 Verify that +/–25V supplies track each other properly.
You can verify that the voltage of the –25V supply tracks that of the +25V
supply /–(0.2% of 20 mV) from the front-panel display by
comparing the voltage values of the +25V supply and the –25V supply.
NOTE
In the track mode, if the CC annunciator is lit when the display is selected for the
+25V supply, choose a higher current limit for the +25V supply. If the CC
annunciator is lit when the display is selected for the –25V supply, choose a
higher current limit for the –25V supply.