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5-27
© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
Ring to Tip
A typical Ring-to-Tip measurement when on-hook might be -48 V DC. If the contact side goes off-hook,
a lower reading (less than -45 V DC) will be expected as current is drawn through the loop and voltage
drops occur.
Tip-to-Ground
In the Tip-to-Ground voltage measurement, an idle state (both sides on-hook) should give a 0 V DC
measurement. This is the proper indication for a Loop Start trunk in the idle state.
When the battery side goes off-hook, a typical measurement of Tip-to-Ground voltage would be -48 V
DC. This indicates a battery reversal. If these or similar readings are not obtained, this indicates trouble
in the loop line signalling circuitry.
3. Press K4 under
EXIT
to return to the main display.
5-6.2 E&M Measurements
To conduct E&M measurements:
1. Select E&M in the Trunk Type setup. (Refer to
Section 3-1.2, Trunk Type Operation,
for
setup.)
2. Calibrate the 930i (Refer to
Section 5-6.1.1
.)
3. Conduct a voltage test. (Refer to
Section 5-6.1.3.
)
The following table shows the range and accuracy of the E&M 2-wire and 4-wire DC voltage
measurements:
Range
Accuracy
M-to-Ground and E-to-Ground:
+0.0 to -100.0
±
3 volt
Option Menu #:
6
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Summary of Contents for 930i
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