External Instruments
Overview
Many CH2 Custom Instructions can be used with test instruments that are external to the CH2 tester.
The two types of external instruments that can be used are measuring devices and programmable power
supplies. Varying measuring devices can measure complex components in your test and provide greater
accuracy. Power supplies allow you to power components in your test. More than one external
instrument can be connected to the CH2 test system. You can purchase external instruments from their
manufacturer or you can purchase them through Cirris. If you have an external instrument that is
currently not supported with custom instructions, call Cirris for assistance.
Limitations of External Instruments
In the picture at right an external
instrument is connected to the scanner
expansion chassis of a two-chassis
system. The CH2 tester allows you to
use an external instrument only with the
chassis to which they are connected.
Therefore in this case, the external
instrument can make measurements
with the test points of the scanner
expansion chassis, not with the test
points of the base chassis.
In this case the LCR meter cable is connected to a 320
point system. Typically LCR meters are used with low
(160 or 320) point systems to ensure accuracy of the
capacitance measurement.
scanner
expansion
chassis
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