OPERATION 
27 
CH1/CH2 Tracking Series Mode 
 
Background 
Tracking series operation doubles the Voltage 
capacity of the GPD-3303 series by internally 
connecting CH1 (Master) and CH2 (Slave) in serial 
and combining the output to a single channel. CH1 
(Master) controls the combined Voltage output 
level. 
The following describes two type of configurations 
depending on the common ground usage. 
Tracking series without common terminal 
 
Connection 
Output rating 
0 ~ 60V/0 ~ 3A 
 
1.  Press the SER/INDEP key 
to activate the tracking 
series mode. The key LED 
turns on. 
 
    GPD-3303 Series User Manual 
28 
 
2.  Connect the load to the front panel terminals, 
CH1+ & CH2− (Single supply). 
 
 
Note: this diagram shows non-European terminals. 
 
3.  Press the CH2 key (LED 
turns on) and then use the 
Current knob to set the CH2 
output current to the 
maximum level (3.0A). 
By default, the Voltage and 
Current knob work in the 
coarse mode. To activate the 
fine mode, press the knob to 
turn the FINE LED on. 
 
 
(Fine control) 
 
 
 
•  Coarse: 0.1V or 0.1A @ rotation click 
•  Fine: the smallest digit @ rotation click 
 
4.  Press the CH1 key (LED 
turns on) and then use the 
Voltage and Current knob 
to set the output voltage 
and current level. 
 
   
 
5.  To turn on the output, press 
the output key. The key LED 
turns on. 
 
 
6.  Refer to the CH1 (Master) meter and indicator 
for the output setting level and CV/CC status.