KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 1.232 (Unit Rev 0 or 1) - Manual (Page 13)

SERIES EL 063010
1-3
1.4 OPERATING MODES
The load operates in one of six modes. Each mode is subject to independent limits for maximum
load current, power, voltage and frequency. Current draw does not occur until the load is turned
ON (engaged with) the Unit Under Test (UUT).
1.4.1 CI (CONSTANT CURRENT).
The current drawn by the load from the UUT remains at a constant value defined by the user.
1.4.2 CV (CONSTANT VOLTAGE)
The current drawn by the load from the UUT varies as required to cause the UUT voltage to
decrease to the voltage defined by the user. Operation in CV mode requires sufficient source
resistance in the UUT so voltage drops in the UUT allow the desired voltage control.
1.4.3 CP (CONSTANT POWER)
The current drawn by the load from the UUT varies as required to cause a constant amount of
power defined by the user to be dissipated by the load, where power is defined as the product of
UUT voltage and current drawn by the load.
1.4.4 CR (CONSTANT RESISTANCE)
The current drawn by the load from the UUT varies as required to cause a constant resistance
(UUT voltage divided by load current) defined by the user.
1.4.5 CS (CONSTANT CONDUCTANCE)
The current drawn by the load from the UUT varies as required to cause a constant conduc-
tance (UUT current divided by load voltage) defined by the user.
1.4.6 SHORT
The current drawn by the load is the maximum possible by the load; load resistance is minimum
ON (see Table 1-2). CAUTION: There is no user adjustment of the current in the SHORT
mode—use caution!
1.4.7 OFF
No current is drawn by the load even when the load is turned ON.
1.5 FEATURES
1.5.1 LOCAL CONTROL
Three 4-digit, 7-segment LED displays and six individual LEDs on the front panel show operat-
ing status. A rotary encoder (CONTROL) allows the user to adjust the selected load parameter,
define the resolution of the rotary encoder and to select the operating mode. An illuminated
momentary pushbutton switch (LOAD) allows the user to alternately a) engage the load, allow-
ing the source or Unit Under Test (UUT) to draw current and b) disengage the load, stopping
current flow. An integral indicator within the LOAD switch changes color to show the load con-
nection status and indicate a fault condition if one exists.