Chapter 3 Setup - THORLABS PDA10CS User Manual

InGaAs Switchable Gain Detector

Chapter 3 Setup

The detector can be set up in many different ways using our extensive line of
adapters. However, the detector should always be mounted and secured for best
operation.
1. Unpack the optical head, install a Thorlabs TR-series ½" diameter post
into one of the #8-32 (M4 on -EC version) tapped holes, located on the
bottom and side of the head, and mount into a PH-series post holder.
2. Connect the power supply 3-pin plug into the power receptacle on the
PDA10CS(-EC).
3. Plug the power supply into a 50 to 60 Hz, 100 to 120 VAC outlet (220 to
240 VAC for -EC version).
4. Attach a 50 Ω coax cable (i.e. RG-58U) to the output of the PDA. When
running cable lengths longer than 12" we recommend terminating the
opposite end of the coax with a 50 Ω resistor (Thorlabs p/n T4119) for
maximum performance. Connect the remaining end to a measurement
device such as an oscilloscope or high speed DAQ card. Caution: Many
high speed oscilloscopes have input impedances of 50 Ω. In this case,
do not install a 50 Ω terminator. The combined loads will equal 25 Ω
which could allow ~135 mA of output current. This will damage the
output driver of the PDA10CS(-EC).
5. Power the PDA10CS(-EC) on using the power switch located on the top
side of the unit.
!
The PDA10CS(-EC) was designed to allow maximum accessibility to the
photodetector by having the front surface of the diode flush with the outside
of the PDA housing. When using fiber adapters, make sure that the fiber
ferrule does not crash into the detector. Failure to do so may cause damage
to the diode and or the fiber. An easy way to accomplish this is to install a
SM1RR retaining ring [included with the PDA10CS(-EC)] inside the 1"
6. Install any desired filters, optics, adapters, or fiber adapters to the input
aperture.
7. During alignment, take appropriate precautions, such as using reduced
radiation power, or other precautions, and use proper eye and/or skin
protection as recommended by the radiation source manufacturer.
8. Apply a light source to the detector. Adjust the gain to the desired
setting.
Rev G, July 15, 2017
threaded coupler before installing the fiber adapter
Caution!
Chapter 3: Setup
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