Ocean Optics HG-1 Mercury Argon - Manual (Page 3)

HG-1-CAL Installation and Operation Instructions
008-00000-STD-01-20100412 3
Alternately, you can use a 9-volt battery (not included) to power the HG-1. Open the battery
hatch of the HG-1 and install the 9-volt battery, and then proceed to Step 2.
2. Connect a fiber to the SMA 905 Connector on the HG-1. If your spectrometer does not have
an entrance slit, use a 50 m diameter (or smaller) fiber. Larger fibers and slits result in
reduced optical resolution.
Note
If the spectrometer does not have a slit and your experiment requires you to use fibers
of varying diameters, you will need to perform a wavelength calibration after
changing fibers. You should perform a wavelength calibration each time you unscrew
the fiber from the spectrometer and change fiber size.
3. Move the On/Off switch on the HG-1 (next to the SMA 905 Connector) to the On position.
The red LED will illuminate to indicate that the HG-1 is powered on.
You have now configured the HG-1 for use.
Calibrating With the Light Source
The information in this section explains how to calibrate your spectrometer’s wavelength using the
HG-1 light source.
About the Wavelength Calibration
You are going to be solving the following equation, which shows that the relationship between pixel
number and wavelength is a third-order polynomial.

p
= I + C
1
p + C
2
p 2 + C
3
p 3
Where  = the wavelength of pixel p,
I = the wavelength of pixel 0,
C
1
= the first coefficient (nm/pixel),
C
2
= the second coefficient (nm/pixel 2 )
C
3
= the third coefficient (nm/pixel 3 )
You will be calculating the value for I and the three Cs.
Calibration Requirements for Ocean Optics
Spectrometers
To re-calibrate the wavelength of your Ocean Optics spectrometer using the HG-1, you will need the
following items: