DC Power Supply Operation 3
Protection Functions
U3606A User’s and Service Guide 79
Checking the OVP operation
To check OVP operation, raise the regulated output current slowly. Watch
the voltage drawn by the load as it reaches near the trip point. Then very
gradually increase the output current using the directional keys until the
OVP circuit trips. This will disable the U3606A output, cause the CC
annunciator to flash, and the OV and Error annunciator to illuminate.
The “triP” message appears on the display after a few seconds of
inactivity.
• The OVP protection feature is always enabled by default whenever you
select constant current mode. You cannot disable the OVP protection.
• If the OVP value is set to a lesser value than the OV value, the OV value
will be adjusted to equal the OVP value.
• The OVP value is not applicable for square-wave output.
• The OVP value is limited by the range selected. Press Shift > Range to
select an appropriate range. You can only select a range when the
output is disabled (the SBY annunciator is illuminated).
Error number 510, “Voltage output over protection” will be recorded in the
error queue when the OVP circuit trips. To read and clear the error
message, see “Reading error messages” on page 114. For a complete list
of all error messages, see Chapter 9, “List of Error Messages,” starting on
page 257.
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