◇
42
4.5.2
Structural principle
Description:
1.
Multi-channel controller output port uses two-wire lead-out, can achieve single contact
inspection
2.
The contact check is similar to the DCR test. It is tested whether the two wires of the same port
are connected. Due to the limited current resistance of the line itself, the test parameters are for
reference only.
3.
When the contact is inspected, the two leads of the same port cannot be directly shorted. Can be
connected to different contacts of the same pin of the DUT; or two pins connected by resistors and
inductors (see illustration).
When the port is not used as a contact check, the two wires can be short-circuited and connected to
the DUT pin.
4.6
Structure and Use of HANDLER and SINGNAL Interface Circuit
4.6.1 Control Interface Theory
HANDLER interface and internal principle of SINGAL interface instrument. The interface signals are as
follows:
