Module re mo te s ense , digit al I/O, and analog current co ntrol terminal
2
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Modular Programmable DC Electronic Load
MDL Series
The tools you need
High per formance architecture
Equipped with a high-performance microprocessor
in every mainframe and module, the MDL Series
programmable DC electronic load utilizes a
parallel architecture that provides a high
measurement speed. Additionally, a simultaneous
load on/off operation can be performed through
the front panel, analog control terminal, or remote
SCPI command. This configuration allows the
system to control modules synchronously and
increases productivity in testing.
Mod ular d esig n
With removable module design, you can choose
suitable load modules to modify the system
according to your requirements. This design
allows for multiple channels and is ideal for
testing several units, especially power supplies
with multiple outputs. At the same time, all load
modules can be configured to work independently.
All load modules, including the high power 500
W and 600 W modules can fit in one slot. Unlike
competitor models that require two slots for high
power modules, the MDL Series offers a one-slot
form factor for all modules.
Tr ansient operation
Transient operation enables the module to
periodically switch between two load levels.
A power supply’s regulation and transient
characteristic can be evaluated by monitoring
the supply’s output voltage under varying
combinations of load levels, duty cycle, and slew
rate. The MDL Series can simulate these
conditions up to 25 kHz.
A
High Level
Low Level
Powe rful communication interfaces
The MDL Series mainframe offers all the latest
options to the user for remote communication.
Connect via GPIB, Ethernet, USB, or RS232 to
carry out data communication through SCPI and
USBTMC standard communication protocols to
control all your electronic load modules from a
PC.
Adjustable slew r ate
In constant current mode, users can control the
rate or slope of the change in current in a
transient response test. Set the slew rate to as
slow as 0.0001 A/
µ
s or as fast as 2.5 A/
µ
s
depending on the module and selected current
range.
Slew Rate
T
List mode
Not limited to just switching between two levels,
list mode lets you generate more complex
sequences of input changes with several different
levels. Up to 7 groups of list files can be saved
in the mainframe. Each list can contain up to 84
steps with a minimum width time of 20
µ
s per
step.
A
Low Voltag e Operation
The MDL series can operate at low voltages for applications such as fuel cell and solar cell testing.
T
Automatic test mode
The MDL Series can execute multiple test
sequences across all channels. Sequences can be
cascaded, and each step can be programmed
with upper and lower limit values. When applied
in automatic production testing, you can easily
judge whether the test parameters of your
devices are within the specification limits and
adjust your process according to the GO/NG
verdict.
MDL400
1.5 V
MDL505
5.4 V
MDL600
1.8 V
Typical minimum operating voltage at full scale current:
MDL200
1V
MDL252
1V
MDL302
1.4 V
MDL305
4.5 V
3
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Modular Programmable DC Electronic Load
MDL Series
Specifications
Model
Input ratings
MDL200
MDL252
MDL302
MDL305
MDL400
MDL505
MDL600
Input Voltage
Input Current
Low
High
0-80 V
0-4 A
0-40 A
200 W
1
0-80 V
0-3 A
0-20 A
250 W / 50 W
1
2
0.15 V at 3 A
1 V at 20 A
0-80 V
0-4.5 A
0-45 A
300 W / 300 W
2
0.14 V at 4.5 A
1.4 V at 45 A
0-500 V
0-3 A
0-20 A
300 W
1
0.7 V at 3 A
4.5 V at 20 A
0-80 V
0-6 A
0-60 A
400 W
1
0.15 V at 6 A
1.5 V at 60 A
0-500 V
0-3 A
0-30 A
500 W
1
0.54 V at 3 A
5.4 V at 30 A
0-80 V
0-12 A
0-120 A
600 W
1
0.18 V at 12 A
1.8 V at 120 A
Input Power
Channels
Minimum
Operating
Voltage
CV mode
Low
High
0.10 V at 4 A
1 V at 40 A
Range
Low
High
Low
High
Low
High
± (0.05 % + 0.02 % F
.S.)
± (0.05 % + 0.025 % F
.S.)
0-80 V
0-80 V
0-80 V
0-18 V
0-500 V
1 mV
10 mV
± (0.05 % + 0.02 % F
.S.)
0-80 V
0-500 V
0-80 V
Resolution
Accuracy
CC mode
± (0.05 % + 0.025 % F
.S.)
Range
Low
High
Low
High
Low
High
0-4 A
0-40 A
0-3 A
0-20 A
0-4.5 A
0-45 A
0.1 mA
1 mA
0-3 A
0-20 A
0-6 A
0-60 A
0-3 A
0-30 A
1 mA
10 mA
0-12 A
0-120 A
0.1 mA
1 mA
± (0.05 % + 0.1 % F
.S.)
± (0.1 % + 0.1 % F
.S.)
Resolution
Accuracy
CR mode
± (0.05 % + 0.05 % F
.S.)
± (0.05 % + 0.05 % F
.S.)
0.05
Ω-10 Ω
0.05
Ω-10 Ω
0.05
Ω-10 Ω
0.25
Ω-10 Ω
0.05
Ω-10 Ω
0.2
Ω-10 Ω
Range
Low
High
10
Ω-7.5
kΩ
16-bit
0.2
Ω-10 Ω
Resolution
Accuracy
CW mode
Low
High
0.01 % + 0.08
S
0.01 % + 0.0008
S
Range
Resolution
Accuracy
Transient mode (CC mode)
200 W
250 W
300 W
300 W
10 mW
± (0.2 % + 0.2 % F
.S.)
400 W
500 W
600 W
T1&T2
2
Accuracy
Slew Rate
3
Low
High
0.0001-0.25 A/
µ
s
0.001-2.5 A/
µ
s
0.0001-0.2 A/
µ
s
0.001-2 A/
µ
s
20 us-3600 s / Res: 5
µ
s-10 ms
5
µ
s+100 ppm
0.0001-0.25 A/
µ
s
0.001-2.5 A/
µ
s
0.0001-0.1 A/
µ
s 0.0001-0.25 A/
µ
s 0.0001-0.1 A/
µ
s
0.001-1 A/
µ
s
0.001-2.5 A/
µ
s
0.001-1 A/
µ
s
0.0001-0.25 A /
µ
s
0.001-2.5 A/
µ
s
1 )
MDL252: The user can allocate up to 250 W to either channel up to 300 W total (e.g. 50 W/250 W, 250 W/50 W, 150 W/150 W).
2 )
Fast pulse trains with large transitions may not be achievable.
3 )
The slew rate specifications are not warranted, but are descriptions of typical performance. The actual transition time is defined as the time for the input to change from 10% to 90%, or vice versa, of the
programmed current values. In case of very large load changes, e.g. from no load to full load, the actual transition time will be larger than the expected time. The load will automatically adjust the slew rate to fit
within the range (high or low) that is closest to the programmed value.
4
www.bkprecision.com
Modular Programmable DC Electronic Load
MDL Series
Specifications
Model
Readback voltage
MDL200
MDL252
MDL302
MDL305
MDL400
MDL505
MDL600
Range
Low
High
Low
High
0-80 V
0.1 mV
1 mV
0-80 V
0.1 mV
1 mV
0-80 V
0.1 mV
1 mV
0-18 V
0-500 V
1 mV
10 mV
± (0.025 % + 0.025 % F
.S.)
0-80 V
0.1 mV
1 mV
0-500 V
1 mV
10 mV
0-80 V
0.1 mV
1 mV
Resolution
Accuracy
Readback current
Range
Low
High
Low
High
Low
High
0-4 A
0-40 A
0.01 mA
0.1 mA
0-3 A
0-20 A
0.01 mA
0.1 mA
0-4.5 A
0-45 A
0.01 mA
0.1 mA
0-3 A
0-20 A
0.01 mA
0.1 mA
0-6 A
0-60 A
0.1 mA
1 mA
0-3 A
0-30 A
0.01 mA
0.1 mA
0-12 A
0-120 A
0.1 mA
1 mA
± (0.05 % + 0.1 % F
.S.)
± (0.1 % + 0.1 % F
.S.)
Resolution
Accuracy
Readback power
± (0.05 % + 0.05 % F
.S.)
± (0.05 % + 0.05 % F
.S.)
Range
Resolution
Accuracy
Protection range (typical)
200 W
250 W
300 W
300 W
10 mW
± (0.2 % + 0.2 % F
.S.)
400 W
500 W
600 W
OPP
OCP
OVP
OTP
General (typical)
200 W
Low
High
4.4 A
44 A
82 V
250 W
3.3 A
22 A
82 V
310 W
5A
50 A
82 V
300 W
3.3 A
22 A
510 V
185 ºF (85 ºC)
400 W
6.6 A
66 A
82 V
500 W
3.3 A
33 A
510 V
600 W
13.2 A
132 A
82 V
Short Circuit
Current (CC)
Voltage (CV)
Resistance (CR)
Input Terminal Impedance
Safety
Electromagnetic Compatibility
Dimensions
Weight
25 mΩ
300 kΩ
50 mΩ
300 kΩ
30 mΩ
300 kΩ
Low
High
4A
40 A
3A
30 A
5A
50 A
3A
20 A
0V
220 mΩ
1 MΩ
25 mΩ
300 kΩ
180 mΩ
1 MΩ
15 mΩ
300 kΩ
6A
60 A
3A
30 A
12 A
120 A
EN61010-1:2001, EU Low Voltage Directive 2006/95/EC
Meets EMC Directive 2004/108/EC, EN 61000-3-2:2006, EN 61000-3-3:1995+A1:2001+A2:2005
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