GW Instek PSM-Series User Manual - Manual (Page 26)

PSM-SERIES PROGRAMMABLE POWER SUPPLY
USER MANUAL
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6. MAINTENANCE
The following instructions are executed by qualified personnel only. To
avoid electrical shock, do no perform any servicing other than the operating
instructions unless you are qualified to do so.
6-1. Fuse Replacement
If the fuse blows, the display will not light and the power supply will not
operate. The fuse should not normally open unless a problem has
developed in the unit. Try to determine and correct the cause of the blown
fuse, then replace only with a fuse of the correct rating and type.
WARNING. For continued fire protection. Replace fuse
only with 250V fuse of the specific type and rating, and
disconnect power cord before replacing fuse.
6-2. Line Voltage Conversion
The primary winding of the power transformer is tapped to permit
operation from 100, 120, 220, or 230VAC, 50/60 Hz line voltage.
Conversion from one line voltage to another is done by change AC
selects switch.
The rear panel identifies the line voltage to which the unit was factory
set. To convert to a different line voltage, perform the following
procedure:
WARNING
PSM-SERIES PROGRAMMABLE POWER SUPPLY
USER MANUAL
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(1) Make sure the power cord is unplugged.
(2) Change the AC selects switch to the desired line voltage position.
A change in line voltage may also require a corresponding change of
fuse value. Install the correct fuse value as listed on rear panel.
6-3. Measurement Techniques
For an accurate and convenient measurement, please set up the instrument
according to the following:
1) Setup:
Figure 6-1