Laser Specifications
Center wavelength: 850 nm
Pulse width: ≤ 10 ms (100 MHz), ≤ 2.5 ns (2 GHz)
Output: ≤ 6 mW
If the instrument is used in a manner not specified in this manual, the protection provided by the
instrument may be impaired. YOKOGAWA assumes no liability for the customer’s failure to comply
with these warnings and requirements.
LEDs on the Frequency Module and SENT Monitor Module
On the front panel of the frequency module (701281 (FREQ)) and SENT monitor module (720243
(SENT)) are LEDs for each channel. These LEDs allow you to check the input condition of the pulse.
ACT
OVER
ACT
OVER
LED
Green: Pulses are being received.
Red: The input voltage range has
been exceeded.
Off: Pulses are not being received.
Note
• The LEDs on the frequency module and SENT monitor module illuminates in green when pulse is
applied and red when the input voltage level is over range. It is independent of the start/stop condition of
waveform acquisition of the DL850E/DL850EV.
• When the preset of the frequency module is set to EM Pickup (electromagnetic pickup), the LED will not
illuminate in red when the range is exceeded.
For information about presets, see section 1.7, “Configuring Frequency, Revolution, Period, Duty Cycle,
Power Supply Frequency, Pulse Width, Pulse Integration, and Velocity Measurements,” in the user’s
manual.
3.3 Installing Input Modules
3-10
IM DL850E-03EN
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