Transient operation – HMC Electronics MDL Series BK Precision DC Electronic Load System Module User Manual
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Transient Operation
Transient operation enables the module to periodically switch between two load levels, as might
be required for testing power supplies. Transient operation can be turned on and off from the
front panel (Tran and Trig keys). Before you turn on the operation, you should set the parameters
associated with the transient operation. The parameters include: A level, A width, B level, B width,
and transient testing modes. There are three different transient testing modes: continuous, pulse,
and toggle.
Continuous Generates a respective pulse stream that toggles between two load levels.
Pulse
Generates a load change that returns to its original state after some time period.
Toggle
Generates a repetitive pulse stream that toggles between two load levels.
It is similar to continuous mode except that the transient points are controlled by
explicit triggers instead of an internal transient generator.
Continuous
In this mode, the electronic load generates a repetitive pulse stream that toggles between two
load levels. Load could switch the state between two value settings, value A and value B.
In CC mode, transient testing can be used to check the stability of the source voltage. Transient
functions have two current levels (A level, B level), which should be in the same range (high range
or low range). You can set the A/B level delay time and the rise/fall slew rate via the mainframe
keypad.
The slew rate determines the rate at which the level changes. Press Trig key, and the load will
continuously switch between the A/B levels preset. Transient loads are usually used to test the
power supply’s performance under continuous changing load conditions. Figure 25 shows the
current waveform of continuous transient operation mode.
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