Table 11. Meter readings
Circuit Type
Class B (spur) Detector Circuit
From zone + to zone – (each zone).
From zone + to ground.
From zone - to ground.
Class B (spur) Notification Appliance Circuit (each signal circuit)
From + to ground.
From - to ground.
Resistance across circuit:
⋅
In one direction.
⋅
In the opposite direction.
Class A (loop) Notification Appliance Circuit (each signal circuit)
From + to ground.
From - to ground.
From + OUT to + IN.
From - OUT to – IN.
Resistance across circuit:
In one direction.
In opposite direction.
Shielding
Shield to ground.
Shield to -.
Shield to +.
MAPNET/IDNet Loops
From MX/IDNet/MAPNET + to ground.
From MX/IDNet/MAPNET - to ground.
Note:
Measuring from MAPNET/IDNet B+ to A+, or B- to A- reads as an open circuit due to the
channel isolators in the loop.
MX Loops
From MX+ one end to MX+ other end of the loop.
From MX- one end to MX- other end of the loop.
From MX+ to MX- one end of the loop.
From MX+ to MX- other end of the loop.
Meter Reading
3.3kΩ (EOLR).
Open circuit.
Open circuit.
Open circuit.
Open circuit.
10kΩ (EOLR).
Low resistance (Load).
Open circuit.
Open circuit.
Less than 50Ω.
Less than 50Ω.
Open circuit.
Low resistance (Load).
Open circuit.
Open circuit.
Open circuit.
Open circuit.
Open circuit.
Less than 75Ω.
Open circuit, loop isolators are
open.
Open circuit.
Open circuit.
90
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