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Overview
1.2 Recommended Starter System
The Multi-Cal-System starter system is an eight-channel system for calibrating PGA308 and PGA309
sensor modules automatically. The starter system allows you to verify that the Multi-Cal-System meets
your specific application requirements. You can expand the capacity of your system later by adding slave
boards. Each slave board adds another eight channels, for a maximum system capability of 64 channels
(one master and seven slave boards). Table 1 describes the recommended starter system and lists the
quantities of each board required.
Table 1. Recommended Starter System
Quantity
Name
Comments
1
Multi-Cal-Master EVM
This basic board gives you eight channels.
You may choose to build your own cable
because of cable length requirements. The
construction of the cable is given in the
Multi-Cal System Cable user's guide
(SBOU092).
2
Multi-Cal-Interface cable
You may choose to build your own cable
because of cable length requirements. The
construction of the cable is given in the
Multi-Cal System Cable user's guide
(SBOU092).
1
1
2
Multi-Cal-Power cable
Multi-Cal-Interface EVM
Multi-Cal-Test EVM(1)
Depending on the mechanical requirements of
your specific system, you may develop your
own interface board.
Two Multi-Cal-Test EVMs allow you to check
two channels. This option is typically enough
for initial evaluation of the system. Eight units
would allow you to fully test all eight channels
of the starter system.
(1)
The Multi-Cal-Test EVM board uses the PGA308. The equivalent PGA309 test board does not exist at
the time of this writing; it is currently under development.
There are also several additional pieces of test equipment required; Table 2 summarizes this equipment.
Table 2. Additional Test Equipment Required
Name
Comments
This is power for the multiplexers on the Multi-Cal-Master board. This
supply can range from ±12 V to ±16 V. Choose a low-noise linear
supply for best performance. This supply also powers slave boards if
you expand the system in the future. Keep in mind the current output
capability.
±15V Supply
Current requirement for Master = 150 mA
Current for each Slave = 150 mA
Example: For eight channels and one master = 150 mA
Example: For 64 channels (one master and seven slaves) = 8 x 150
mA = 1.2 A
This supply can range from 5V to 40V, depending on your sensor
module requirements. This power will be directly connected to the
sensor modules. Choose a low-noise linear supply for best
performance. Keep in mind the current output capability. All sensor
modules are powered simultaneously, so multiply the number of
channels by the expected device current to determine the
requirements.
Loop or DUT Power Supply
Example: For eight current loop modules: Assume that maximum
current = 25mA (overcurrent range); 8 x 25 mA = 20 0mA
Example: For 64 current loop modules: 64 x 25 mA = 1.6 A
Must allow for software control through RS-232 or IEEE488.
Suggested instrument is the Agilent 34401A.
Precision Digital Multimeter
GPIB-USB-HS
This controller is not required if you are using RS-232 control. This
item is a National Instruments IEEE488 controller. It allows you to
connect your computer to the precision multimeter for automatic
control.
7
SBOU087A–August 2010–Revised April 2011
Multi-Cal-System Evaluation Module
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