Cirris Signature 1000HN, Руководство пользователя

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Section 10: Select a Test Procedure / Hipot Testing
1000HN User’s Guide / page 44
Hipot Testing
The purpose of hipot testing is to test the effectiveness of the insulation on a cable
assembly.When you hipot test, you are making sure that there is extremely high elec-
trical resistance between points that should not be connected in the cable or harness.
Important note!
Before the analyzer performs a hipot test, it performs a connection
resistance test (sometimes called a continuity test) to make sure that all connections in
the cable are correct. If the analyzer finds any open or shorted connections during the
continuity test, it will not perform the hipot test.
Once a cable passes the continuity test, the analyzer can begin a hipot test. The ana-
lyzer applies high voltage to a group of connected pins (“nets”). The remaining pins
are tied together. In the example below, we see net number 1 being hipot tested.
Remember that each net the analyzer tests has capacitance to every other net. That
means there is a current surge as this capacitance is charged. The analyzer carefully
monitors this current surge. The amount of current tells the analyzer how much
energy is being delivered to the cable. If the current delivered is excessive, the
Typical test 0.5
Ω
100M
Ω
300V 100mS Use these settings when low
connection resistance is
important, and the cable has
little capacitance. Low
connection resistance may
require careful adapter
maintenance. The hipot test
will not work on extremely
long cables.
Stringent
test 0.5
Ω
500M
Ω
630V 10 seconds Use these settings for slow,
stringent testing when you
need low connection resis-
tance and extremely good
insulation resistance.
Maintain connector adapters
carefully! Works only with
clean adapters in low relative
humidity.
1
2
3
4 1
2
3
4
NC
1
2
3
4 1
2
3
4
NC
OPEN
This is a known-good cable
with all connections intact.
Example of the same cable
with an open connection.
The hipot test cannot be done
on this cable.
1
2
3
4 1
2
3
4
NC
+-
I
Hipot voltage
Current meter