User`s manual

33
Component
Settin
g
& Test
Connection Resistance
(Conn Res)
How good are the connections in a cable? The Connection Resistance setting specifies the
maximum resistance a connection can have and still be considered good as opposed to having
high resistance.
When learning a cable, the connections in the cable must be lower in resistance than the
Connection Resistance setting to be learned as connections. When testing a cable the
connections in the cable must be lower than the Connection Resistance setting to pass the
test.
Guidelines on Connection Resistance
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To allow for cable and tester tolerances, you generally should select a Connection
Resistance that is at least 20% or 0.2 ohms (whichever is greater) above the resistance of
the actual connections.
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Adapters that are used heavily can over time develop worn contacts that will add to the
Connection Resistance measurement. Cirris recommends that you replace worn adapters
before they affect the measured Connection Resistance and create high resistance errors.
If you must use adapters with substantial wear, you will have to increase your Connection
Resistance setting to get cables to pass.
The tester can measure the actual connection resistance and give you a suggested value for
the Connection Resistance setting.
To Have the Tester Calculate a Suggested Connection Resistance Setting:
1. Attach a sample cable.
2. To access the “calculate” function from the main menu press Create New Test, Set Learn
Settings, Set Lrn Res Thrsholds, and Calculate Conn Res.
3. The tester displays a Suggested Res value. This suggested Connection Resistance value
is 20% greater than the highest resistance seen in the sample cable.
You can derive a better Connection Resistance setting by taking into account the variances of
more sample cables. To make the calculation include subsequent cables, connect each cable,
then press Calc New Sample.
Note that you should use Calculate Conn Res. with caution as a bad sample cable may cause
the suggested value to be higher than it should be.
Zero
Resistance
Connection
Resistance
Setting
Infinite
Resistance
Selections Factory
Default
.1Ω-100KΩ, 500KΩ
1MΩ, 5MΩ
10.0Ω
HIGH RESISTANCE
GOOD
OPEN