Operation Overview
3. Operation Overview
3.1 Introduction
Chroma 6334 and 6332 multiple electronic load mainframes are suitable for design,
manufacturing, testing and quality assurance for electronic products. The Mainframe
contains four (two) slots of load modules. Each Load module occupies either one or two
slots depending 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. The built-in remote control function
enables you to control and read back the current, voltage and status. The SYNC function on
the Mainframe synchronizes each module when the module current/voltage level changes.
The 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 has three (two) cooling fans, and the module has one cooling fan. The fan
speed automatically increases or decreases when the module power rises or falls. This
feature reduces overall noise level as the fans do not always run at 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 with its own input connectors, and can be turned
on/off or short-circuited independently. If your application requires a greater power or
current capacity than one module can provide, you have to connect load modules in parallel in
CC or CR mode.
Each load module can be controlled either remotely via GPIB/RS-232C or locally via the
front panel. Once a channel is selected or addressed, all subsequent commands go to that
channel till another channel is selected or addressed. The operation of all modules in the
Mainframe is similar in spite of power ratings; meanwhile each module has a keypad to
control itself.
3.2 Front Panel Description
The Mainframe front panel includes a 16 × 2 characters LCD display, 8 (4) channel indicators,
and keypads. All parameters of Load are set through Mainframe. The LCD display also
shows which function is being performed when you use the keypads. Three of the keys have
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. Figure 3-1 shows the
front panel of Mainframe 6332.
3-1
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