Function and Features
Copyright © ITECH Electronic Co., Ltd. 35
3.20 External Signal Control Interface
Besides the RS232 communication interface, the rear panel is also equipped
with a DB-9 COM interface, which is the external signal control interface used in
auto test. The pin definitions are as follows.
Pins of Plug
The auto test runs last step.
The auto test starts to run.
During the auto test, the input is
turned on.
Output the failure signal of the
auto test.
The auto test runs next step.
The auto test outputs via signal.
The warning tone signal of auto
test outputs.
You can control the auto test process and test results by transmitting
input/output signals through external signal control interface. Different pins of
the interface control different functions. Detailed instructions are listed on the
above table.
Under external analog quantity control mode, you can switch CC mode through
pin 1 of the interface and switch CV mode through pin 6.
3.21 Auto test function
The IT8800 series electronic load delivers strong auto test functions, which can
analog several tests. A total of 10 groups of test files can be edited, and each
group test file has 10 steps. Therefore, a maximum of 100 steps can be edited
and saved in EEPROM.
NOTE
In the following editing procedures, "Y indicates selected status. To cancel selected
status, press numeric key of corresponding step again.
Edit test files following steps below:
Operation steps
1. Press [Shift] + [6] keys.
PROGRAM
Run Recall Edit
2. Operate
key and move to Edit. Press [Enter] key to enter editing
test files.
EDIT PROGRAM
Active Sequence=0987654321
3. Press numeric key to select test step and press [Enter] key. Active
Sequence= 09876543YY (indicating that 1/2 step has been selected).
EDIT PROGRAM
Active Sequence=09876543YY
4. Select whether pause is necessary for these two steps. If step 2 is to be
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