GW Instek GPS-x303 Series - Manual (Page 15)

MULTI-OUTPUT POWER SUPPLY
USER MANUAL
24
D. Set output on by adjusting VR702 so that the CH3 meter also reads
rating amps (invalid for GPS-3303).
E. Connect a variable load (load must be rated to handle a power of at least
30W) across the output terminals and connect the multimeter to read the
output current, then adjust the load on the multimeter to show an output
current at 3.25A for GPS-3303&4302, 1.20A for GPS-4303 and 2.75A
for GPS-4251.
F. Slowly adjust VR402 clockwise until the output voltage (read from the
multimeter) drops 5mV to 6mV (start current limit point).
G. Connect a variable load across the output terminals and connect the
multimeter to read the output current, then adjust the load on the
multimeter to show an output current at 3.15A for GPS-3303&4302,
1.10A for GPS-4303, and 2.65A for GPS-4251.
H. Adjust VR402 until the 3A (GPS-3303&4302), 2.5A(GPS-4251) and 1A
(GPS-4303) OVERLOAD indicator light.
(5) CH4 Supply Adjustment
A. Connect the multimeter across the output terminals of the CH4 SUPPLY
to read output voltage and adjust VR603 to obtain a reading of
8~15V(GPS-4302/4303/4251) on the multimeter.
B. Set the supply VOLTAGE control to maximum (fully clockwise), set
output off by adjusting the trimmer potentiometer VR803 from the CH4
voltage indicator circuit board (located on the meter or A/D converter
board) for a reading of rate voltage on the CH4.
C. Turn VR601 on the main master circuit board (located on the right side
of the supply) fully counterclockwise.
D. Set output on by adjusting VR902 so that the CH4 meter also reads
rating amps.
E. Connect a variable load (load must be rated to handle a power of at least
30W) across the output terminals and connect the multimeter to read the
output current, then adjust the load on the multimeter to show an output
current at 1.20A.
MULTI-OUTPUT POWER SUPPLY
USER MANUAL
25
F. Slowly adjust VR602 clockwise until the output voltage (read from the
multimeter) drops to 5mV~6mV (start current limit point).
G. Connect a variable load across the output terminals and connect the
multimeter to read the output current, then adjust the load on the
multimeter to show an output current at 1.10A.
H. Adjust VR602 until the 1.10A OVERLOAD indicator first lights.
6-4. Cleaning
To clean the power supply, use a soft cloth dampened in a solution of mild
detergent and water. Do not spray cleaner directly onto the instrument, since it
may leak into the cabinet and cause damage. Do not use chemicals containing
benzine, benzene, toluene, xylene, acetone, or similar solvents. Do not use
abrasive cleaners on any portion of the instrument.