Basic Operations
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command “PROTection:CLEar”). Then OCP on the load screen will disappear,
and the load will exit the OCP status.
Overpower protection (OPP)
The electronic load has two kinds of overpower protection: hardware overpower
protection and software overpower protection.
Hardware overpower protection: the user can set the hardware overpower
protection value, and the load power will be limited at the present power by the
hardware. The present ON/OFF status of the load cannot be changed in
hardware overpower protection.
Software overpower protection: the user can set the software overpower
protection value of the load.
Clearing overpower protection:
Check whether the power of the test object is within the rated power range of
the load or within the protection power setting range. If the power of the test
object is beyond the rated power range or protection power setting range,
disconnect the test object, and press any key on the front panel (or send the
command “PROTection:CLEar”). Then OPP on the load screen will disappear,
and the load will exit the OPP status.
Over-temperature protection (OTP)
When the temperature of the power component in the load exceeds 85℃, the
temperature protection will be enabled. In this case, the load will be
automatically OFF, and the LCD will display OTP. At the same time, the OT and
PS position in the status register will be set and kept until the load is reset.
Clearing over-temperature protection:
When the load temperature decreases to the protection temperature, press any
key on the front panel (or send the command “PROTection:CLEar”). Then OTP
on the load screen will disappear, and the load will exit the OTP status.
Out-of-range frequency protection
When the measured frequency is beyond the frequency range (45HZ to 450HZ),
“FREQ ERR” will be displayed.
Undervoltage protection
When the load is applied and current is sinking, the voltage will decrease
instantly as a result of impedance of the test unit. When the voltage is lower
than the required input voltage, loading will be stopped to protect the load and
test unit, and the UV prompt will appear on the interface. The user should
decrease the loading current or CF value to ensure normal operation.
Loading failure
Loading failure occurs in the following cases:
⚫ The input voltage is 0 during loading;
⚫ The voltage is reduced to 0 during loading;
⚫ The load hardware is abnormal;
⚫ The voltage and loading current fluctuates continuously.
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