ITech IT6600C Series User Manual page 44

This chapter describes the functions and features of the power supply.
4.1 Source Mode/ Load Mode Switch
The IT6600 series integrates bidirectional power supply and regenerative load
functional characteristics in one unit for continuous supply and absorption of
current. It not only can realize the function of power source, but also capable of
sink to load current, that realize the fast and continuous seamless switching
between output and sink current , to effectively avoid voltage or current
overshoot.
The switching mechanism between source mode and load mode is determined
solely by the set voltage value of the power supply and the actual value at the
power output terminal.

Source Mode: When the set voltage value of the IT6600 is higher than the
actual voltage of the externally connected product under test, the IT6600
will operate in Source mode.

Load Mode: When the set voltage value of the IT6600 is lower than the
actual voltage of the externally connected product under test, the IT6600
will operate in load mode.
4.1.1 Only load mode
This series supports setting the power supply to only load mode and can be
tested with load in CR, CC, and CW modes. The usage of this function is as
follows:
1. Press the composite keys [Shift] + [V-set] (Config) on the front panel to
enter the config menu.
2. Press the up/down key or rotate the knob to find Priority Mode menu.
i.
ii.
3. Press [Esc] to return to the main interface.
Users can set the constant current value (Is), constant resistance value (Rs),
and constant power value (Ps) in load mode.
The power supply works in the mode that yields the minimum sink current
value (calculated value). In constant resistance mode, the instrument's sink
current is determined by I=U/Rs, while in constant power mode, the sink
current is determined by I=Ps/U. Here, U represents the output voltage of
the Device Under Test (DUT).
4. Set the DUT (power supply) to output 100V, 50A.
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Chapter4 Power Supply Function
Press the up/down key to move the cursor to the Mode function setting
and press the [Enter] key to confirm. Rotate the knob to set CC priority,
and press the [Enter] key to confirm.
Press the up/down key to move the cursor to the Only Load function
setting and press the [Enter] key to confirm. Rotate the knob to select
On, and press the [Enter] key to confirm.
If Is = -10A, Rs = 5Ω (sink current is 100/5 = 20A), and Ps = 3000W
(sink current is 3000/100 = 30A), the actual sink current is 10A. In this
case, the instrument is working in CC mode.
If Is = -10A, Rs = 20Ω (sink current is 100/20 = 5A), and Ps = 3000W
(sink current is 3000/100 = 30A), the actual sink current is 5A. In this
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Power Supply Function
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