Olson Technology LP-CH-16B - Manual (Page 7)

025-370403 REV X9 Page 7 of 11
The optical power alarm LED is normally green. It turns red
on insufficient optical power. 4mW of optical output reads 4.0V at
TP.
The laser current alarm LED is normally green. It turns red
on excessive laser current. At a typical laser current of 30mA the TP
will read 0.6V.
The cooler alarm LED is normally green. It turns red when
the cooler cannot keep the laser at a constant temperature.
The RF level adjust control allows for a 4dB range of input
level adjustment.
The RF test point is calibrated to read +10dBmV @
547.25MHz for proper laser modulation with 83 channel loading.
This level will change with channel loading. It does not require
termination.
Push the laser enable switch with an alignment tool to enable
or disable the laser. The laser should be disabled whenever there is
no fiber connected. Disabling the laser will cause a local optical
power alarm, but will not cause a remote module or chassis alarm.
‘Teasing’ this switch may cause very brief remote alarms.
The optical output connector is type SC/APC, with optional
FC/APC connector available.
NOTE: The Laser Enable switch is no longer available on newer
models.
INDICATORS AND TEST POINTS FOR LP-OT-6
The laser transmitter has front panel test points for optical power and laser current. Only a high impedance
voltmeter should be used. The meter common should be connected to the module ground test point, not to chassis
ground.
If the channel loading is less than 40, you may decide not to increase the levels by the maximum possible
amount. This will provide improved distortion at the cost of S/N. The best rule of thumb is to use the maximum
possible levels for long haul links, and lower drive levels as the links get shorter.