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To begin discussing Power Control in this device, it is necessary to first understand the design of its power supplies

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Since this device is used not only for relay testing but also for testing instruments such as transformers

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its power sources have a high burden capability. Depending on the design,

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if the equipment under test does not require a high burden, the device’s power is dissipated in the existing MOSFETs and appears as heat.

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Therefore, the amplifier burden must be managed based on the connected load in order to prevent temperature rise.

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Note that when we talk about the device’s burden, we are referring to the positive and negative voltage limits of the amplifier.

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To better understand this, consider a current source capable of injecting 32 A of current and 22 V peak

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If the connected load has an impedance of 100 milliohms, injecting 5 A requires only 0.5 V.

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Therefore, the remaining 21.5 V appears across the MOSFETs, and based on the power dissipation formula, we can say: P = 21.5 × 5 = 107.5 watts.

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This amount of power is dissipated in the MOSFETs and results in increased temperature.

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Therefore, the lower the upper and lower voltage limits are, the less power is dissipated on the MOSFET

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On the other hand, if the voltage is too low, the current injection may not be performed correctly

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Thus, there is an optimal point where the temperature remains low and the upper/lower voltage levels are just sufficient to deliver the requested current.

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This adjustment can be done in two ways: automatic and manual. The automatic mode is available only on devices from model 205 - 8 and above

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By enabling the Power Control option, the adjustment is performed automatically.

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However, because the system must constantly monitor for current spikes at every moment,

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it carries out this process conservatively. After enabling this option and starting the test,

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you will see the Power Control percentage displayed.

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The second method is the manual mode, which is available on all devices, including models 105 and 205

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For this method, after designing the test plan,

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the software automatically identifies the highest voltage and current values present in the test plan during the Hardware Check step

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and uses them to optimize the Power Control

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In the highlighted section, the percentage of the amplifier’s voltage

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relative to its nominal value is reduced and adjusted as much as possible to minimize it. The user can also manually modify this value.

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Ultimately, an optimal value for Power Control is obtained and applied in the software. After running the test

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you will see that the calculated value is used during the test for managing the device burden.