KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 15)

SERIES EL 071414 1-5
1.5.9 BUILT-IN PROTECTION
• Overtemperature. Thermal management of the EL Series is accomplished by continually
monitoring the temperature of each individual power-dissipating MOSFET. If the temper-
ature of a MOSFET begins to approach a dangerous level, then its power will be
reduced and the other MOSFETs will naturally increase their share via the control loops.
If the temperature of one or more of the MOSFETs exceeds safe operating limits, this
may cause either a reduction of the load maximum current/power handling ability or a
complete inability to use the load depending on the degree of overheating.
• The user can establish limits for overvoltage or undervoltage, overcurrent, or power
which can not be exceeded at the input. If the limits are exceeded, the unit disengages
from the UUT and a fault indication is displayed (see PAR. 3.3.1 for details).
1.5.10 MASTER/SLAVE CONTROL
For configurations that require power or current in excess of the maximum available from a sin-
gle unit, additional units can be added to the system to increase power/current capability, up to a
maximum of 14 additional units.
1.6 SPECIFICATIONS
Parameters unique to different models of Series EL loads are listed in Table 1-1. Specifications
common to all Series EL models are listed in Table 1-2.
TABLE 1-2. SERIES EL SPECIFICATIONS
SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT
MODE CHARACTERISTICS
Linearity vs. programming command See Table 1-3
5 – 100%; accuracy is % of Full Scale value
(2)
Regulation
(1) See Table 1-3 5 – 100%; regulation is % of Full Scale
value
(2)
Resolution (via computer control) 14 Bits 5 – 100% of Full Scale
Current readback
(Current mode) Computer Accuracy: ±0.25%
5 – 100%; accuracy is % of Full Scale value
(2)
Computer Resolution: ±16 Bits 5 – 100% of Full Scale
Parameter readback
(Current and Voltage) Accuracy: ±0.25% (±1% for 50V models)
Accuracy is % of Full Scale value
(2)
Resolution: ±16 Bits
Temperature
coefficient:
100 ppm/°C
CONTROL CHARACTERISTICS
USB Interface Uses IEEE 488.2 and SCPI
commands and queries.
Requires driver.
RS-232 Interface Uses IEEE 488.2 and SCPI
commands and queries.
Baud rate: 38400
Parity: None
Data Bits: 8
Stop Bits: 1
Flow Control: None
GPIB Interface Uses IEEE 488.2 and SCPI
commands and queries.
Optional. GPIB address 10 = default
Ethernet Interface Uses IEEE 488.2 and SCPI
commands and queries.
Optional.