Setting The Source Modulation Frequency - Greenlee 560XL Manuel D'instructions

XL Series Optical Power Meters (cont'd)
[l] key: This key controls two modes:
• Selects the calibration wavelength. Available wavelengths vary by model.
See the "Specifications" section for details.
• When the [l] key is held down at the desired wavelength, pressing the
[dB/dBm] key sets this wavelength as the new power-on default stored
in non-volatile memory.
CAL/OP switch: This switch, located inside the battery compartment
behind a tamper-evident label, is used when recalibrating the instrument.
Calibration is recommended every 12 months. Contact Greenlee for more
information regarding periodic recalibration.
NOTE: FOR NORMAL OPERATION, THE CAL/OP SWITCH SHOULD ALWAYS BE
SET TO THE "OP" POSITION. TAMPERING WITH THE CAL/OP SWITCH WILL
VOID CALIBRATION OF THE INSTRUMENT.
Input interface: This is the optical input connector. All 560XL Series optical
power meters are equipped with a SOC interface.

Setting the Source Modulation Frequency

All 570XL, 573XL, 577XL, and 578XL Series LED sources and 580XL Series
laser sources are shipped with the modulation frequency switch set at
1 kHz.
To change this setting, remove the batteries and set the switch shown in
the figure below to the desired position using the tip of a pencil or small
screwdriver.
The user may select among 270 Hz, 1 kHz, and 2 kHz square wave modu-
lated outputs. Replace the batteries, battery cover, and rubber instrument
cover after selecting the modulation frequency.
Note: The average modulated power output will be 3 dB less than the
average power in continuous wave (CW) mode.
Modulation frequency switch
20