LDC-3700 Series
113
C H A P T E R
5
C
ALIBRATION
AND
T
ROUBLESHOOTING
This chapter describes calibration of your LDC−3700B Series Laser Diode Controller. Descriptions
of the required test instruments, calibration conditions, and the detailed procedures for calibration of
the instrument’s Temperature Controller and the Laser Diode Current Source are included. A
troubleshooting guide is also offered for some of the more common failure symptoms. This chapter
is divided into three major sections, Local (front panel) calibration, remote (through the GPIB
Interface) calibration, and a troubleshooting guide.
ILX Lightwave Corporation provides in−house and on−site calibration services for ILX instruments.
Most ILX instruments require yearly calibration to ensure performance to published specifications.
ILX factory calibrations employ NIST traceable measurement instrumentation, and our calibration
engineers and technicians use automated test equipment to accurately and efficiently capture and
record calibration data. An original certificate of calibration authenticity is provided with all instrument
calibrations, and a detailed report showing any pre−calibration out−of−tolerance conditions is
available upon request. Calibration turn−times are normally five business days or less. On−site
calibrations can be performed around your production schedule, night or day, seven days a week.
Please contact ILX Customer Support (see page xi for contact information) for additional calibration
information.
Calibration Overview
There are several calibrations to completely calibrate the LDC−3700B Laser Diode Controller. The
Temperature Controller calibration consists of calibrating the temperature sensors and the TE
module bipolar current source and TEC voltage measurement. The TEC voltage calibration can
only be done remotely. The Laser Diode Current Source calibration consists of calibrating the
current source in both ranges and both modes (low and high bandwidth), calibrating the PD monitor
feedback ammeter, and calibrating the forward voltage measurement. The current limits are
calibrated internally by the instrument as part of the calibration process.
Your LDC−3700B Series Controller can be calibrated with the case closed. Calibrate the instrument
every 12 months or whenever performance verification indicates that calibration is necessary, such
as differences between set point and measurement display values which exceed the accuracy
specification. Calibrate the instrument under laboratory conditions. ILX recommends calibration at
23 °C, ±1.0 °C. When necessary, however, the LDC−3700B Series Laser Diode Controller can be
calibrated at its intended use temperature if this is within the specified operating temperature range
of 0−50
°
C.
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