User manual

22
DC Electronic Loads
8500 Series
Features & Benefits
■ Constant current (CC), resistance (CR),
voltage (CV), and power (CP) operation
■ Wide voltage and current range, 0 to
500 V, 0 to 240 A (5000 W max)
■ Low minimum operating voltage of
< 0.1 V and minimum input resistance of
5 mΩ (model 8518) allow the load to sink
high current at low voltages, required for
fuel and solar cell applications
■ Selected models operate up to 500 V,
suitable for high voltage applications
■ Built-in transient generator
■ Short circuit test
■ Built-in high resolution (0.1 mA/1 mV)
voltage and current meter (models 8500
& 8502)
■ Bright, easy to read display (VFD
technology)
■ Overcurrent/overvoltage/overpower/
overtemperature protection
■ RS232 & USB to TTL serial converter
cable and application software included
■ List mode operation for increased
throughput
■ Battery testing mode to provide A*hr
rating of battery (cut off voltage level is
adjustable)
■ Flexible triggering: create trigger
events by front panel keystroke, back
panel TTL signal, or software
■ Remote voltage sensing to compensate
for the effect of voltage drop in wires
■ Store 25 instrument setups
■ Thermostatically-controlled fans
■ All models are rack mountable. Compact
300 W and 600 W models are ideal for
bench use
Low Voltage Operation
The 8500 series can operate well below 1 V,
which is important for low voltage application
such as fuel cell and solar cell testing. All
models can regulate (provide a stable input)
down to 0.1 V. Due to a particularly low input
resistance, model 8518 can operate at full
scale current of 240 A at 1.2 V (see image).
Typical minimum operating voltage at full scale current
8500 8502 8510 8512 8514 8518 8520 8522 8524 8526
1.05 V 3 V 1.8 V 3 V 1.92 V 1.2 V 10.8 V 3.6 V 1.56 V 1.8 V
Low voltage operation graph
High resolution, easy to read display
Numeric keypad Function keys Front panel
load input terminals
The 8500 Series programmable DC electronic
loads can be used for testing and evaluating
a variety of DC power sources. Their wide
operating ranges of up to 500 V and 240 A,
flexible operating modes and excellent
measurement accuracy make the 8500 series
well suited for characterizing DC power
supplies, DC-DC converters, batteries, fuel
cells, and solar cells.
The loads can operate in CC, CV, CR, or CP
mode while voltage/current or
resistance/power values are measured and
displayed in real time. Load terminals are
isolated and floating. Extensive protection,
including overtemperature, overpower,
overvoltage, overcurrent and reverse
polarity will help protect your valuable
prototype.
These DC loads are easy to use. All parame-
ters can be set quickly and precisely from the
front panel, or programmed via RS232 or USB
interfaces.
Current
Voltage