3 DC Power Supply Operation
Protection Functions
82 U3606A User’s and Service Guide
Checking the OCP operation
To check OCP operation, raise the regulated output voltage slowly. Watch
the current drawn by the load as it reaches near the trip point. Then very
gradually increase the output voltage using the directional keys until the
OCP circuit trips. This will disable the U3606A output, cause the CV
annunciator to flash, and the OC and Error annunciator to illuminate.
The “triP” message appears on the display after a few seconds of
inactivity.
• The OCP protection feature is always enabled by default whenever you
select constant voltage mode. You cannot disable the OCP protection.
• If the OCP value is set to a lesser value than the OC value, the OC value
will be adjusted to equal the OCP value.
• The OCP value is not applicable for square-wave output.
• The OCP 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 511, “Current output over protection” will be recorded in the
error queue when the OCP 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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