3-1
3 OPERATION OVERVIEW
3.1 Introduction
The Sorensen MML-4 and MML-2 multiple electronic load mainframes are used for
design, manufacturing, testing and quality assurance. The Mainframe contains four
(or two) slots for load modules. Load modules occupy either one or two slots. It
depends on the power rating of the module. The Mainframe can dissipate up to 1200
watts when it is full loaded. It contains a processor, GPIB and RS-232C connectors,
front panel keypad and display, and PASS/FAIL signals. Built-in remote control
functions allow you to control and read back current, voltage, and status. The SYNC
function of the Mainframe synchronizes each module when module current/voltage level
changes. Save/Recall feature allows you to save up to 100 files, 10 programs, and
one default setting. All of them can be saved in Mainframe EEPROM for future use.
The Mainframe contains three (or two) cooling fans, and the module contains one
cooling fan. The fan speed automatically increases or decreases as the module power
rises or falls. This feature reduces overall noise level because the fans do not always
run at the maximum speed.
Each module can operate independently in constant current (CC), constant resistance
(CR), and constant voltage (CV) modes. An individual module may have one or two
channels. Each of them has its own channel number, contains its own input
connectors, and can be turned on/off or short-circuited independently. If your
application requires a power or current capacity greater than one module can provide,
you must connect the load modules in parallel in CC or CR mode.
Each load module can be independently controlled either remotely via GPIB/RS-232C
or locally via a keypad on the front panel. Once a channel is selected or addressed, all
subsequent commands go to that channel until another channel is selected or
addressed. Operation of all models in the Mainframe is similar regardless of power
ratings.
3.2 Front Panel Description
The front panel of Mainframe includes a 16
×
2-character LCD display, 8 (4) channel
indicators, and keypads. All parameters of the Load are set through the Mainframe.
The LCD display also shows which function is being performed when you use the
keypads. Three of the keys perform two functions. The alternative function is labeled
in blue above the key. It is selected by pressing the blue SHIFT key and the function
key simultaneously.
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