Min/Max Marker Reset; Additional Measurement Settings - THORLABS PM200 Operation Manual

PM200
power ranges; also there might be a zero shift in the bar graph representation.
In logarithmic (dBm) representation the unit cannot display negative values. In
this case the display will show 'nan' (Not A Number).
Photodiode sensors emit small current levels, even when no photons hit the
active area – the so called dark current, that is temperature dependent and in the
region of some nA for silicon and InGaAs sensors and up to some µA for
germanium sensors.
Thermopile sensors need to be zeroed when thermal differences between active
area (thermal disk) and the sensor heat sink appear when no light hits the active
area or when the heat sink gets hot under light exposure. The zero value will be
negative when the heat sink is hotter than the active area and positive, when the
active area is hotter than the heat sink. When both heat sink and active area are at
room temperature a zero voltage of some µV is normal.
3.9

Min/Max Marker Reset

In the main display, two markers (green and red in numeric view, green and
yellow in needle view) display the minimum and maximum measured power
values. The

3.10 Additional Measurement Settings

The measurement settings page can beached via the settings page
then press .
There are listed various sensor dependent configuration items:
Common for all sensors:
wave length correction
attenuation
measurement units
ranging
line filter for anti-aliasing
Photo diode sensors: bandwidth
Pyroelectric sensors: trigger level
Thermal Sensors: accelerator (speed-up circuitry) settings
Also, in this panel the following settings can be made:
Beam characteristic parameters for calculating the power or energy density
Configuration of the PM200 for customer built sensors
Long-term logging control
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icon resets these two markers.
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