User Manual

68 Part 003609A revision 01 December 16, 2002
Amosphere NPM Installation Procedures (WCS)
ii Observe the voltage reading on the multimeter. The voltage should be less
than 0.5mV from 0.
If the voltage is greater than ±0.5mV, there may be a grounding problem. See
the documentation that ships with your power supply for troubleshooting
procedures. Do not power on the NPM until the problem has been resolved.
6 Test the voltage potential between the +24V and return (–) pins:
i Flip CB 11 on the radio rack to the ON (up) position.
ii Connect the black multimeter probe (–) to pin A3 (–).
iii Connect the red multimeter probe (+) to pin A1 (+24V).
iv Observe the voltage reading on the multimeter. The voltage should be
between +24V and +28V.
If the voltage is not between +24V and +28V, there may be a problem with the
main power supply. See the documentation that ships with your power supply
for troubleshooting procedures. Do not power on the NPM until the problem
has been resolved.
7 Test the voltage potential between the +24V and ground pins:
i Ensure that CB 11 on the radio rack is in the ON (up) position.
ii Connect the black multimeter probe (–) to pin A2 (ground).
iii Connect the red multimeter probe (+) the pin A1 (+24V).
iv Observe the voltage reading on the multimeter. The voltage should be
between +24V and +28V.
v If the voltage is not between +24V and +28V, there may be a problem with the
ground or the main power supply. See the documentation that ships with your
power supply for troubleshooting procedures. Do not power on the NPM until
the problem has been resolved.
8 Test the voltage potential between the ground and return pins while the circuit is
powered on:
i Ensure that CB 11 on the radio rack is in the ON (up) position.
ii Connect the black multimeter probe (–) to pin A2 (ground).
iii Connect the red multimeter probe (+) the pin A3 (–).
iv Observe the voltage reading on the multimeter. The voltage should be less
than ±0.5mV.
If the voltage is not between +24V and +28V, there may be a problem with the
grounding or the main power supply. See the documentation that ships with
your power supply for troubleshooting procedures. Do not power on the NPM
until the problem has been resolved.
9 If all the tests described in steps 5–8 passed, then the NPM is properly grounded
and the main power supply is operating correctly.