The Sorensen SL series electronic loads offer the
best value with the most exible platform. A wide
range of loads are available from 75-1800W with
both DC and AC input in benchtop, modular and
standalone form factors.
SLM Mainframe
The SLM mainframe choices include a convenient
single-bay conguration for benchtop/desktop
applications or a four bay conguration for
multichannel and ATE requirements. Either chassis
is compatible with SLM- and SLD- loads. Each
chassis contains non-volatile memory capable of
storing up to 150 module setups and nine 16-step
sequences for automated, standalone testing.
Or for more complex test sequences, the chassis
come with GPIB (optional on SLM-1) and RS-232
as standard interfaces.
SLM Family
The SLM family includes nine models of fully
programmable, single input AC or DC modular
electronic loads. DC models are offered to
test power supplies, battery chargers, battery
discharge, power supply transient response and
integration into ATE systems. AC models are ideal
to test low power inverters.
The DC models support operation in Constant
Current (CC), Constant Voltage (CV), Constant
Resistance (CR) or Constant Power (CP) mode
as well as a short simulation. Engineers have
60–500 V
1–720 A
100115230
ultimate control of current waveforms by using
either the analog input or CC dynamic mode.
An analog input (single input DC models) allows
arbitrary current waveforms up to 20kHz with an
external 0-10V signal. In dynamic mode, the pulse
generator allows fast state switching between
two programmed current levels with programmed
slew rate and dwell times.
SLD Family
The SLD family offers six models of fully
programmable, dual input modular electronic
loads. These DC modules are specically designed
for low power, high channel count testing and
provide the highest channel density available.
SLH Family
Fully programmable, high power AC or DC
electronic loads. The 500V models are for PFC
testing, power transformers and various other AC
or DC power sources. The 300V models are used
for testing of UPSs, automatic voltage regulators
(AVR), and batteries.
• High current, 60V DC models for general
purpose power supply testing
• High voltage,AC/DCmodels are intended
for inverter test,
• Power Factor Correction (PFC) circuit testing
(500V) and UPS testing (300V)
858.458.0223
sales@ProgrammablePower.com
259
Volts
Current
Figure 1 - Power Curve
SL Series
Electronic Load Selection
Often the selection of programmable power
supplies is based upon volts and amps capability.
However when selecting an electronic load,
it is important to account for volts, amps and
power. The power limit is displayed on a constant
power curve. A load must be selected so that
the operating points are within the Power Curve
(see Figure 1). For many applications in which
different power sources are tested, there may be
high voltage, low current requirements as well
as low voltage, high current requirements. A
single load may be able to handle both with good
programming resolution. In cases where a single
load may not work, the broad range of current,
power and voltage available in the SL series
allows optimum selection depending upon the
voltage, current, power required.
Applications
Low Voltage Operation
All SL series loads operate well below 1V.
However in many applications, such as fuel cell
research and microprocessor voltage regulator
modules (VRM), the voltage at the load inputs
can be 0.1 to 0.2V. This low voltage does not
allow the load transistors to fully turn-on (bottom
right corner of the power contour). To utilize the
full rated current of an electronic load, a boost
supply can be placed in series to increase the
voltage. While a xed voltage DC-DC converter
can be used as the boost supply, a programmable
power supply is preferred to keep the load
voltage at the minimum to draw full current as
the device under test ramps up in voltage.
Range 1: | Range 2:0-3A0-30A0-6A0-60A0-1A0-10A0 -1A0-10A0 -1.5A0-15 A
Resolution:0.8mA8.0mA1. 6mA16.0mA0.268mA2.68mA0.268mA2.68mA0.4mA4.0mA
Accuracy:± 0.2% of (Setting + Range)
CR Mode
Range 1:
(I > 0.02% of RATING)
Range 2:
(I > 0.2% of RATING)
CV Mode
Range:0-60V0-60V0-250V0-500V0-60V
Resolution:0.016V0.016V0.067V0.133 V0.016V
Accuracy:± 0.1% of (Setting + Range)
CP Mode
Range:0 -150W0-300W0-300W0-300W0-75 W
Resolution:0.04W0.08W0.08W0.08W0.02W
Accuracy:± 0.5% of (Setting + Range)
T High & T Low:50µs to 9.999s
Rise/Fall of Range 1:2.0-125mA/µs4-250mA/µs0.8-50mA/µs0.8-50mA/µs1.0-62.5mA/µs
Rise/Fall of Range 2:0.2-1.2A/µs0.04-2.5A/µs8.0-500mA/µs8.0-500mA/µs10-625mA/µs
Accuracy:± 10% of Setting
4 1/2 DVM:
Range:15.0V60.0V15.0V60.0V30.0V250.0V199.99V500.0V15.0V60.0V
Resolution:0.001V0.002V0.001V0.002V0.0 01V0.01V0.01V0.1V0.001V0.002V
Accuracy:± 0.05% of (Reading + Range)
Voltage (Volt)+60V+60V+60V-60V+80V+80V+60V-60V-60V-60V+60V+60V
Current (Ampere)50A5A50A5A20A20A5A5A5A5A100A5A
Power (VA)250W50W250W50W100W100W75W75W75W75W500W50W