Gain Adjustment; Chapter 5 Troubleshooting - THORLABS PDA10CS User Manual

InGaAs Switchable Gain Detector
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4.6. Gain Adjustment

The PDA10CS(-EC) includes a low noise, low offset, high gain transimpedance
amplifier that allows gain adjustment over a 70dB range. The gain is adjusted by
rotating the gain control knob, located on the top side of the unit. There are 8
gain positions incremented in 10dB steps. It is important to note that the
bandwidth will decrease as the gain increases. See the specifications table in
Chapter 6 to choose the best gain vs. bandwidth for a given input signal.

Chapter 5 Troubleshooting

Problem
There is no signal response.
Output Voltage will not increase.
Detector Output is skewed.
Page 6
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Verify that the power is switched on and all
connections are secure.
Verify the proper terminating resistor is installed if
using a Voltage measurement device.
Verify that the optical signal wavelength is within the
specified wavelength range.
Verify that the optical signal is illuminating the
detector active area.
Check to make sure the detector is not saturated.
Refer to the Output Voltage spec. in the
Specifications table.
Install a 1" Lens Tube (SM1L10) to the thread
coulpler (SM1T1) to baffle any external light sources
to see if this improves the response.
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Suggested Solutions
Chapter 5: Troubleshooting
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13058-D02