6-8
TSL-710 Operation Manual
6-5 External Modulation
This product is equipped with a function for modulating the intensity of optical power
using external modulation signals. The modulations are classified as either low-
frequency or high-frequency according to the frequency band of the modulation signal.
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6-5-1 Low-frequency Modulation
Modulating the intensity of optical power is performed at relatively low frequency from
DC to 400 kHz.
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How to set
1.Set the power control mode to manual (refer to “6-3 Switching
the optical power control mode”).
2. Move to the screen for various settings from the main screen using Menu (F4key)
→ Mod. (F3 key).
3. Put cursor to “Source” in “Modulation Settings” section, and press ENTER key.
4. Set the source to Ext. with the keys, or the dial.
Modulation bandwidth is expanded and “Ext. Mod” lights up at the right side on the screen.
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5. Input the modulation signal into the BNC connector labeled “LF Mod.” inside the
cover at the bottom of the front panel.
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