Fluke 990DSL, Руководство пользователя

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POTS Testing and Fault Location
The POTS Toolbox
4
4-9
Voltage Test
The Voltage test gives you a “snapshot” measurement of AC and DC voltages
on each leg of a pair. The test can identify hazardous voltage, an idle or busy
POTS line, a Special Service circuit “footprint”, or a cross-to-battery fault.
Setting Up a Voltage Test
To set up a Voltage test, select the test on the POTS Toolbox and press
D
(
Setups
)
.
Refer to Table 4-2 for Voltage test setup parameters.
Table 4-2. Voltage Test Setup Parameters
Parameter Settings (default in bold)
ACV Hazard. Volt Threshold
≥
50 VAC (Range = 40 to 120)
ACV Pass Thresholds - TR:
TG & RG:
≤
3 VAC (Range = 1 to 30)
≤
25 VAC (Range = 1 to 30)
DCV Hazard. Voltage Threshold
≥
190 VDC (Range = 70 to 200)
DCV Pass Threshold
≤
3 VDC (Range = 1 to 20)
DCV Test Impedance 100 K
e
(Std. Telephony impedance)
1 M
e
(Compatible with 965DSP
™
)
10 M
e
(Compatible with DVMs)
DCV Idle POTS Voltage Range High side = -60 to -44 VDC
Low side = 4 to -4 VDC
(Range = 0 to
±
99 VDC)
(Absolute value of Low
<
High)
DCV Busy POTS Voltage Range High side = -44 to -26 VDC
Low side = -4 to -25 VDC
(Range = 0 to
±
99 VDC)