Constant voltage (cv) mode – HMC Electronics MDL Series BK Precision DC Electronic Load System Module User Manual
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Between the 10% and 90% region, the slew rate can be measured by observing the steepest slope
portion. In case of very large load changes, e.g. from no load to full load, the actual transition time
will be larger than the expected (measured) time. For this reason, the firmware allows the user to
program slew rate values outside of the specified slew rate ranges. The minimum transition time
for all programmable slew rates is also limited in cases where the transition from one setting to
another is very small, due to bandwidth limitations of the load.
Constant Voltage (CV) Mode
In this mode, the electronic load will attempt to sink enough current to control the source voltage
to the programmed value.
Figure 18 - Constant Voltage Mode
Ranges
When working in CV mode, you can press the Setup key to enter the RANGE menu. Two
overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Voltage can be edited in either
of the two ranges. Low range will supply higher accuracy and better resolution when you set lower
current. 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 VOLT:RANG
command to switch voltage range.
Voltage Level
Set the voltage level on front panel or by sending SCPI command VOLT <n>. If the load is in CV
mode, the new setting immediately changes the input. If the electronic load is not in CV mode, the
set voltage level will be saved in the instrument for use until the mode is switched to CV mode.
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