6. OPERATIONS
6-1 INDEPENDENT OPERATION
(1) The (+) terminal or the(-) terminal is to be connected always to the GND.
Terminal(GND) with short circuit bar as an accessory should be connected as shown in
Fig6-1.
When positive output polarity is required.
- GND +
SHORT CIRCUIT BAR
(2) Connect the AC Power cord to the power source of the specified voltage, and turn on
the power switch.
(3) To set the load voltage,slowly turn the voltage adjusting knob (5) caorse clockwise
with no load ,while watching the amperemeter.
The knob (5) is for coarse adjustment,and the knob(4) is for fine adjustment.
(4) Load current setting is used for limiting the current applied to a device to be tested at
a specified power or to protect the device from the over current.
To set the current, connect the (+) and (-) terminala by a thick lead wire.
Slowly turn the current adjustment knob (3) , and set the current while watching the
amperemeter indication.
At this time,set the voltage adjustment knob (5) full counter clockwise and set the
white mark of the FINE adjustment knob (4) at middle.
The minimum current that can be set is as follows.
GP-4303D/A : Approx. 200mA ~ 3A GP-4185D/A : Approx. 350mA ~ 5A
After setting a limiting current,remove the short circuit wire.
Then set the voltage to a required voltage level.
(5) After completing the above procedure,watch the polarity of a device to be applied
and use the instrument.
If the voltmeter indication becomes less than the sset level for a defect of a device to
be tested or for any other reason, the overcurrent protection circuit is activated,
resulting in switching into the constant current operation from the constant voltage
operation.
When the instrument is to be used in the constant voltage operating condition,set the
current adjustment knob full clockwise.
In this case the short circuit current is 3A +10% for the GP-503, 5A +10% for the
GP-305/505,and 10A + 5% for the GP-3010.
Fig. 6-1
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