HMC Electronics MDL Series BK Precision DC Electronic Load System Module - Manual (Page 41)

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Constant Power (CW) Mode
In this mode, the electronic load will consume a constant power. When input voltage increases,
the input current will decrease, while power (P = V*I) will remain the same.
Figure 20 - Constant Power Mode
Ranges
When working in CW mode, you can press the Setup key to enter the RANGE menu. Two
overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Power can be edited in either of
the two ranges. Low range will supply higher accuracy and better resolution when you set lower
power. If any value you set is outside the maximum value of the LOW RANGE, you should select
HIGH RANGE. If the electronic load is in remote control mode, you can use the POW:RANG
command to switch power range.
Immediate power level
Set the power level via the front panel. If the load is in CW mode, the new power level setting
immediately changes the input. If the load is not in CW mode, the power level setting will be saved
for use until mode is switched to CW mode.
Transient power level
A/B transient power level can be set via the front panel or by remote operation. The electronic
load can continuously toggle between the two levels when transient operation is turned on.
Constant Impedance (CZ) Mode
In this mode, the electronic load uses an A/D converter to sample and a built-in DSP calculation to
simulate the transient current wave of the tested components.
Circuit principle is as follows:
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440