KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 39)

SERIES EL 071414
3-3
3.4 SELECTING THE MODE AND SETPOINT
To select a mode and setpoint for the controlled parameter (current, power, voltage, resistance
or conductance) prior to drawing current from the UUT, verify that the LOAD pushbutton indica-
tor is green (steady) and proceed as follows:
1. Depress and hold the CONTROL knob for 3 seconds. The LOAD pushbutton indicator goes
from green to off. Release the CONTROL knob. Rotating the CONTROL knob sequentially
selects the operating mode in the order: CV, CI, CP, CR, CS, SHORT and OFF (see Table 3-
1). To set the selected mode, press and hold CONTROL knob for 3 seconds; LOAD pushbut-
ton indicator goes from off to green.
2. After the operating mode is selected, set the CONTROL resolution by momentarily depress-
ing the CONTROL knob (CONTROL knob must be depressed twice the first time it is used
after a mode selection). This causes one digit in the selected mode parameter display
(AMPS, VOLTS, KW) to blink while showing the setpoint. The blinking digit indicates the
CONTROL resolution setting for one click of rotation. Momentarily depressing the CON-
TROL knob again shifts the resolution selection to the next digit.
3. Rotate the CONTROL (clockwise to increase or counterclockwise to decrease) to adjust the
parameter setpoint. Once the setpoint is selected, the setpoint remains displayed momen-
tarily and then the display returns to displaying the measured parameter value.
TABLE 3-1. MODE SELECTION AND ADJUSTMENTS
MODE
INDICATOR
MODE
SELECTED
ADJUSTMENT
Only CI on
(solid)
CI mode
(Constant Current).
CONTROL sets constant current level in Amperes as viewed on AMPS display.
Only CR on
(solid
CR mode
(Resistance)
CONTROL sets resistance in Ohms as viewed on KW display.
Only CR on
(blinking)
CS mode
(Conductance)
CONTROL sets conductance in Siemens (= I in Amps / E in Volts) as viewed on KW
display.
Only CV on
(solid)
CV mode
(Voltage)
CONTROL sets voltage in Volts as viewed on VOLTS display.
Only CP on
(solid)
CP mode
(Constant Power)
CONTROL sets constant power level in kilowatts as viewed on KW display.
CI, CR, CV and
CP all blinking
Short mode
(lowest ON resis-
tance possible).
Short mode; maximum current, no adjustment. USE CAUTION before selecting this
mode.
CI, CR, CV and
CP all off
Off Modes off, no adjustment. Load will not engage, no setpoints are active and load will
not conduct current. When modes are off, pressing LOAD switch causes LOAD indica-
tor to blink green, then rotate CONTROL to show model and serial number. on front
panel displays (see PAR. 3.7).