MDL Series Datasheet

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The MDL Series is a multi-channel modular

programmable electronic load system. Seven

different modules of programmable DC loads

ranging in power from 200 W to 600 W

provide users the flexibility to test a wide range

of power sources from multi-output AC/DC

power supplies to batteries, fuel cells, and

photovoltaic arrays.

The mainframe has four slots that can be

configured with any assortment of the modules

up to 2400 W (up to 4800 W with mainframe

extension). The high-performance electronic load

modules of the MDL Series are capable of

operating in constant current (CC), constant

voltage (CV), constant resistance (CR), constant

power (CW), and constant impedance (CZ)

Features and Benefits

■ Power range up to 2400 W

■ Voltage range up to 500 V

■ Current range up to 120 A

■ CC/CV/CR/CW/CZ operating modes

■ Removable modules for easy system

configurability

■ Support for up to 16 channels using dual

channel modules with mainframe extension

■ Operate identical modules in parallel mode

for high current applications

■ Synchronous Load on/off function

■ Standard LAN, GPIB, USB, and RS-232

interfaces with USBTMC/SCPI protocol support

■ Analog current control and monitoring

■ Transient mode up to 25 kHz

■ List mode (sequence mode) - minimum 20 µs

step width with 84 user programmable steps

■ Adjustable slew rate in CC mode

■ 16-bit voltage and current measurement

system providing high resolution of 0.1 mV

and 0.01 mA

■ Automatic test function

■ 101 memory locations to save/recall setting

parameters

■ Remote sense

■ OVP/OCP/OPP/OTP and reverse voltage

protection

Modular Programmable DC Electronic Load

MDL Series

Data Sheet

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mode, which uses DSP technology to simulate

non-linear loads and realistic loading behavior.

Easily edit the load’s parameters such as voltage,

current, slew rate, and width via the front panel.

Increase productivity by saving your test

parameters into any one of the 101 memory

areas for quick system recall. Additionally, the

MDL Series provides 16-bit resolution as well

as numerous protection modes and a power-on

system self-test to ensure the reliability of your

testing.

For remote communication, the MDL series

provides LAN, USBTMC compliant USB,

RS232, and GPIB standard interfaces that

support SCPI command protocol.

Modules MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600

Power 200 W *250 W/

50 W

300 W/

300 W 300 W 400 W 500 W 600 W

Operating Voltage 80 V 80 V 80 V 500 V 80 V 500 V 80 V

Rated Current 40 A 20 A 45 A 20 A 60 A 30 A 120 A

No. of Channels 1 2 2 1 1 1 1

* The MDL252 is a dual-channel 250 W load module supporting a

unique flexible power configuration. 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), thus replacing many dual-channel

modules with fixed power distribution.

Technical data subject to change

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Front panel

Modular Programmable DC Electronic Load

MDL Series

Rear panel

Main frame

function keys

Numeric

keypad

Power

switch

Br ight VFD display

Mainfr ame

Adjust ment knobModule panel keys

Modules

LAN interface

Module remo te sense, digital I/O, and analog cur rent co ntrol ter minal

Load input t erminals

RS- 232 in terface

GPIB interface

Main frame

trigger I/O a nd

synchroni zati on

on/of f cont ro l

▲

Mainfr ame

extension

connector

Module

current

monitoring

terminal

USB interf ace

Cumm (A) 140 120 100 — Mme _ MDUU — ~1sz MW“ — MDLsos / — MDL252 / /‘ — Moms

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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.

The tools you need

High performance architecture

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.

Modular design

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.

Automatic test mode

The MDL series can operate at low voltages for applications such as fuel cell and solar cell testing.

Low Voltage Operation

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.

Powerful communication interfaces

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.

Transient operation

List mode

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/µs or as fast as 2.5 A/µs

depending on the module and selected current

range.

Adjustable slew rate

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 µs per

step.

Modular Programmable DC Electronic Load

MDL Series

High Level

Slew Rate

Low Level

MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600

1 V 1 V 1.4 V 4.5 V 1.5 V 5.4 V 1.8 V

Typical minimum operating voltage at full scale current:

,25 :2 Ian (I n

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Modular Programmable DC Electronic Load

MDL Series

Specifications

Model MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600

Input ratings

Input Voltage 0-80 V 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V

Input Current Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A

High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A

Input Power 200 W 250 W / 50 W 1300 W / 300 W 300 W 400 W 500 W 600 W

Channels 1 2 2 1 1 1 1

Minimum

Operating

Voltage

Low 0.10 V at 4 A 0.15 V at 3 A 0.14 V at 4.5 A 0.7 V at 3 A 0.15 V at 6 A 0.54 V at 3 A 0.18 V at 12 A

High 1 V at 40 A 1 V at 20 A 1.4 V at 45 A 4.5 V at 20 A 1.5 V at 60 A 5.4 V at 30 A 1.8 V at 120 A

CV mode

Range Low 0-18 V

High 0-80 V 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V

Resolution Low 1 mV

High 10 mV

Accuracy Low ± (0.05 % + 0.02 % F.S.) ± (0.05 % + 0.025 % F.S.) ± (0.05 % + 0.02 % F.S.)

High ± (0.05 % + 0.025 % F.S.)

CC mode

Range Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A

High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A

Resolution Low 0.1 mA 1 mA 0.1 mA

High 1 mA 10 mA 1 mA

Accuracy Low ± (0.05 % + 0.05 % F.S.) ± (0.05 % + 0.1 % F.S.)

High ± (0.05 % + 0.05 % F.S.) ± (0.1 % + 0.1 % F.S.)

CR mode

Range Low 0.05 Ω-10 Ω0.05 Ω-10 Ω0.05 Ω-10 Ω0.25 Ω-10 Ω0.05 Ω-10 Ω0.2 Ω-10 Ω0.2 Ω-10 Ω

High 10 Ω-7.5 kΩ

Resolution 16-bit

Accuracy Low 0.01 % + 0.08

High 0.01 % + 0.0008

CW mode

Range 200 W 250 W 300 W 300 W 400 W 500 W 600 W

Resolution 10 mW

Accuracy ± (0.2 % + 0.2 % F.S.)

Transient mode (CC mode)

T1&T2 220 us-3600 s / Res: 5 µs-10 ms

Accuracy 5 µs+100 ppm

Slew Rate 3Low 0.0001-0.25 A/µs 0.0001-0.2 A/µs 0.0001-0.25 A/µs 0.0001-0.1 A/µs 0.0001-0.25 A/µs 0.0001-0.1 A/µs 0.0001-0.25 A /µs

High 0.001-2.5 A/µs 0.001-2 A/µs 0.001-2.5 A/µs 0.001-1 A/µs 0.001-2.5 A/µs 0.001-1 A/µs 0.001-2.5 A/µs

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.

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Modular Programmable DC Electronic Load

MDL Series

Specifications

Model MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600

Readback voltage

Range Low 0-18 V

High 0-80 V 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V

Resolution Low 0.1 mV 0.1 mV 0.1 mV 1 mV 0.1 mV 1 mV 0.1 mV

High 1 mV 1 mV 1 mV 10 mV 1 mV 10 mV 1 mV

Accuracy ± (0.025 % + 0.025 % F.S.)

Readback current

Range Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A

High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A

Resolution Low 0.01 mA 0.01 mA 0.01 mA 0.01 mA 0.1 mA 0.01 mA 0.1 mA

High 0.1 mA 0.1 mA 0.1 mA 0.1 mA 1 mA 0.1 mA 1 mA

Accuracy Low ± (0.05 % + 0.05 % F.S.) ± (0.05 % + 0.1 % F.S.)

High ± (0.05 % + 0.05 % F.S.) ± (0.1 % + 0.1 % F.S.)

Readback power

Range 200 W 250 W 300 W 300 W 400 W 500 W 600 W

Resolution 10 mW

Accuracy ± (0.2 % + 0.2 % F.S.)

Protection range (typical)

OPP 200 W 250 W 310 W 300 W 400 W 500 W 600 W

OCP Low 4.4 A 3.3 A 5 A 3.3 A 6.6 A 3.3 A 13.2 A

High 44 A 22 A 50 A 22 A 66 A 33 A 132 A

OVP 82 V 82 V 82 V 510 V 82 V 510 V 82 V

OTP 185 ºF (85 ºC)

General (typical)

Short Circuit

Current (CC) Low 4 A 3 A 5 A 3 A 6 A 3 A 12 A

High 40 A 30 A 50 A 20 A 60 A 30 A 120 A

Voltage (CV) 0 V

Resistance (CR) 25 mΩ50 mΩ30 mΩ220 mΩ25 mΩ180 mΩ15 mΩ

Input Terminal Impedance 300 kΩ300 kΩ300 kΩ1 MΩ300 kΩ1 MΩ300 kΩ

Safety EN61010-1:2001, EU Low Voltage Directive 2006/95/EC

Electromagnetic Compatibility Meets EMC Directive 2004/108/EC, EN 61000-3-2:2006, EN 61000-3-3:1995+A1:2001+A2:2005

EN 61000-4-2/-3/-4/-5/-6/-11, EN 61326-1:2006

Dimensions 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm)

Weight 11 lbs (5 kg)

Three-Year Warranty

Number of

Slots Power Input Operating

Temperature

Storage

Temperature Humidity

4 110/220 V ±10%, 50/60 Hz 32 to 104 ºF

(0 to 40 °C)

14 to 140 ºF

(-10 to 60 °C) Indoor use, ≤95%

Model Type Dimensions (W x H x D) Weight

MDL001 Mainframe 17.5” x 7.2” x 21.6”

(445 x 183 x 549 mm) 34 lbs (15.4 kg)

MDL002 Mainframe

Extension

17.5” x 7.2” x 21.6”

(445 x 183 x 549 mm) 34 lbs (15.4 kg)

MDL200 Module 3.2” x 7.2” x 22.6”