OVP / Secure Key
This key has a double function: OVP settings in normal mode operation and
secure key in calibration mode operation (for the latter see Calibration
section).
In this section OVP functions will be described.
OVP circuit prevents the output voltage from rising above a programmed
voltage value. So the load connected to the output terminals is protected of
overvoltage situations.
Overvoltage protection circuit is activated when output voltage value becomes
equal or greater than the programmed trip level for overvoltage protection
circuit.
OVP Menu Overview
By pressing OVP / Secure key, you enter OVP menu.
Here, programmed OVP trip level will be displayed.
When you turn on the power supply, OVP trip level is OVP trip level value
saved at power_up state (state 0). This value can be changed by the user (and
saved in power_up state if wanted).
Here you can set desired OVP trip level, by using > < keys to select the digit
you want to adjust (selected digit has the cursor underneath) and knob to set the
digit to desired value.
The programming range for OVP trip level depends on the model of the power
supply (see the table bellow):
Power supply
model
OVP min value OVP max value
9120 1 V 33 V
9121 1 V 22 V
9122 1 V 63 V
9123 1 V 33 V
The OVP trip level you set is saved by pressing OVP / Secure key.
After that, you enter the OVP menu.
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