Electronic Load

Control electronic load settings and modes

Control electronic load Nets through the Lager CLI. Electronic loads are used to simulate various load conditions for testing power supplies, batteries, and other power sources.

Syntax

lager eload [OPTIONS] NET_NAME COMMAND [ARGS]...

Global Options

Option	Description
--box BOX	Lagerbox name or IP address
--help	Show help message and exit

Commands

Command	Description
cc	Set or read constant current mode (A)
cv	Set or read constant voltage mode (V)
cr	Set or read constant resistance mode (Ω)
cp	Set or read constant power mode (W)
state	Display electronic load state

Command Reference

cc

Set or read constant current (CC) mode in amps.

lager eload NET_NAME cc [VALUE] [--box BOX]

Arguments:

• VALUE - Current value in amps (0–40 A). If omitted, reads current setting. Values outside the range are rejected.

In CC mode, the electronic load maintains a constant current draw regardless of voltage changes.

Examples:

# Set constant current to 2.5A
lager eload LOAD1 cc 2.5

# Read current CC setting
lager eload LOAD1 cc

cv

Set or read constant voltage (CV) mode in volts.

lager eload NET_NAME cv [VALUE] [--box BOX]

Arguments:

• VALUE - Voltage value in volts (0–150 V). If omitted, reads current setting. Values outside the range are rejected.

In CV mode, the electronic load adjusts current to maintain a constant voltage at its terminals.

cr

Set or read constant resistance (CR) mode in ohms.

lager eload NET_NAME cr [VALUE] [--box BOX]

Arguments:

• VALUE - Resistance value in ohms (0.03–10000 Ω). If omitted, reads current setting. Values outside the range are rejected.

In CR mode, the electronic load behaves as a fixed resistance, with current varying according to Ohm’s law (I = V/R).

cp

Set or read constant power (CP) mode in watts.

lager eload NET_NAME cp [VALUE] [--box BOX]

Arguments:

• VALUE - Power value in watts (0–200 W). If omitted, reads current setting. Values outside the range are rejected.

In CP mode, the electronic load adjusts voltage and current to maintain constant power dissipation.

state

Display the current state of the electronic load.

lager eload NET_NAME state [--box BOX]

Returns information about the current operating mode, settings, and measurements.

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Examples

# Set constant current mode to 1.5A
lager eload ELOAD1 cc 1.5 --box my-lager-box

# Set constant voltage mode to 5V
lager eload ELOAD1 cv 5.0

# Set constant resistance mode to 10 ohms
lager eload ELOAD1 cr 10.0

# Set constant power mode to 50W
lager eload ELOAD1 cp 50.0

# Check current state
lager eload ELOAD1 state

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Operating Modes

Constant Current (CC)

The load draws a fixed current regardless of voltage:

• Use for testing power supply regulation
• Ideal for battery discharge testing
• Current remains stable as voltage varies

Constant Voltage (CV)

The load maintains a fixed voltage at its terminals:

• Simulates a voltage-clamping load
• Useful for testing current-limited supplies
• Current varies to maintain voltage

Constant Resistance (CR)

The load behaves as a fixed resistor:

• Current proportional to voltage (Ohm’s law)
• Simulates resistive loads
• Natural response for many real-world loads

Constant Power (CP)

The load maintains constant power dissipation:

• P = V × I remains constant
• Current increases as voltage drops
• Simulates switching power supplies and similar loads

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Supported Hardware

Manufacturer	Model Series	Features
Rigol	DL3000	CC/CV/CR/CP modes, programmable

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Notes

• Net names refer to names assigned when setting up your testbed
• Use lager nets to see available e-load nets
• Electronic loads can dissipate significant power; ensure adequate cooling
• Always verify load ratings before applying high power levels