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Si Biased Detector Chapter 4: Operation
Page 8 13052-D05
The output bias voltage will be dependent on the load resistor as described below.
The A23 battery voltage characteristics show that the charge level is almost
depleted as the voltage drops below 10 V. For this calculation we assume 9.6 V
since V
BAT
= low battery voltage – one diode drop (0.6 V) = ~9 V. The detector will
continue to operate until the battery charge is completely drained, however these
numbers provide a reference point at which the battery should be replaced.
∗
: 9 , 50 , 1050
4.11. Battery Replacement
Thorlabs delivers each DET with an A23 12 V battery installed. This battery is
readily available at most retail stores, as well as through
Thorlabs. Please note that due to slight physical
variations of the positive terminal from manufacturer to
manufacturer, Thorlabs only recommends using an
Energizer battery in our DET series of photodetectors.
The battery supplied will deliver about 40 hours with a
1 mA load, roughly equivalent to a continuous 1.5 mW
light source at peak wavelength. The supply current
when the unit is on and no light is applied is very small
and should not significantly degrade the battery. The
battery can be replaced with a DET1B power adapter
when the detector is being used in applications where
a small increase in the signal noise due to noise in the
line voltage is permissable or the finite lifetime of a
battery is not acceptable.
Locate the battery cap directly above the output BNC. Unthread the cap and
remove the battery. Install the new battery into the cap, negative side in, and thread
back into the DET. Be careful not to cross thread the cap into the housing. The
DET includes a protection diode to prevent damage if the battery is installed
backwards. The battery direction is located on the housing.
Detector
Body
A23 Battery
Positive
Negative
Cap