3-21
© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
Front Panel
Operation
3-2.6 Measure Noise Function Key
To measure Noise:
1. Press the Measure Noise function key. The display reads:
0 dB PSOPH TR BAL
K1
K2
K3
K4
2. Press K2 to scroll through the weighting filters:
3K FLT
(3 kHz Flat),
PSOPHOMETRIC
,
P-NOTCH
,
or
S/N
(Signal-to-Noise).
K3 is inactive, displaying the input signal source (
TR, T1R1, PCM1,
or
PCM2
).
3. Press K1 to scroll through and select a relative dBm, dB or dBm0 reference point, or to enter
a TLP correction factor.
4. If you selected a
dBm0
reference point, scroll through the reference points until a flashing
cursor is displayed, and use the numeric keypad to enter the level.
• A valid reference point is between
-999
and
+999
dB.
5. K4 toggles between
BAL
(balanced) or
N TO G
(Noise-to-Ground) measurements or analogue
trunks. On PCM trunks, the displays shows the CHANNEL. K4 is inactive on PCM trunks and
during Signal-to-Noise measurements.
6. To measure noise other than C-Notch, use Dial/Ring mode to call the far-end Type-100 test
line. This will place a quiet termination on the line.
To measure Signal-to-Noise:
1. Call the local milliwatt number to get a 1004 Hz tone sent back. Alternately, contact someone
at the other end of the circuit and have them send 1004 Hz back.
2. Press the Measure Noise function key.
3. Press K2 repeatedly to select
S/N
. The display reads:
29 dB S/N TR BAL
K1
K2
K3
K4
If the holding tone is not present instead of the level, the display reads:
NO TONE
.
The S/N ratio measurement requires that a holding tone be present at the measuring end of the circuit.
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