KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 14)

1-4 SERIES EL 071414
1.5.2 REMOTE CONTROL
Remote control of the Series EL Electronic Load is accomplished from a remote device using
SCPI commands and either RS-232 or USB protocols. GPIB (G suffix) or LAN (E suffix) proto-
cols are available as an option. The RS-232 and USB ports cannot be turned off, therefore the
Series EL can always be controlled via these ports. Digital commands expand the control avail-
able from the front panel, and include damping when required for square wave or pulse type
requirements, overvoltage, undervoltage, overcurrent and overpower protections.
1.5.3 ANALOG PROGRAMMING
Two analog control ports are provided. A hazardous input external control and an isolated input
analog control. The hazardous input provides for a fast transient capability of 20 microseconds.
The isolated analog control input has a transient capability of 60 microseconds. The transient
capability is affected by damping of the EL. Refer to PAR. 3.17 for details.
1.5.4 DIGITAL CALIBRATION
Internal adjustments of the Series EL Electronic Load are automatic. Calibration can be per-
formed remotely via one of the remote interfaces.
1.5.5 DAMPING
Typical operation for an electronic load involves the flow of high currents. The combination of
high, rapidly changing currents and the inductance associated with connections to the load via
lead wires can cause unexpected results, such as very high voltage spikes, oscillation or severe
ringing (damped oscillations) at the source. To help reduce these issues, the Series EL offers
multiple forms and degrees of damping, allowing the best measurements possible. See PAR.
3.14 for details.
1.5.6 RAMPS
Three independently adjustable ramps allow the user to ease the transition when changing to 1)
a more positive state, 2) a more negative state, and 3) reaching operating mode setpoint after
engaging the load. See PAR. 3.15 for details.
1.5.7 INPUT CUTOFF
The input cutoff feature allows the user to determine a minimum input voltage required for
engaging the load. This feature also allows the user to adjust the time the unit will wait for input
voltage to recover if it falls below the minimum. See PAR’s B.11 and B.13 for details.
1.5.8 TRANSIENTS
The EL Load allows the user to inject a transient into the unit under test. Transients are avail-
able in voltage, current, conductance or resistance modes, and can be single or repeating.
User-controllable transient parameters are maximum value, time duration, pulse-width and (for
repeating transients), the period. See PAR. B.100 for details.