22 • General Operation
NEW FOCUS, Inc.
The front-panel current readout does not reflect the modulation input.
You can calculate the actual current by adding the current shown on
the front-panel display to the modulation input.
Reading an Input Signal
You can monitor an input signal using the DC-coupled
Detector Input
connector on the back of the laser controller. The input is connected to
a 10-bit analog-to-digital converter. This general-purpose input allows
you to collect data from another instrument, such as a photodetector,
during a wavelength scan. The signal from this input can only be read
using computer control (see page 33); it will not be displayed on the
front panel.
Connect the line for the input signal to the BNC connector on the back
of the laser controller. Make sure the signal conforms to the following
specifications:
Detector Input Guidelines
Connector Type
BNC
Voltage Range
0 V to +5 V
Input Frequency
DC–10 kHz
Impedance
51 k
Ω
64X7 rev E.fm Page 22 Tuesday, April 3, 2001 4:16 PM
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