Vernier VSP-EM User manual

Vernier Emissions
Spectrometer
(Order Code: VSP-EM)
The Vernier Emissions Spectrometer is a
portable spectrometer designed to measure
emissions from a wide variety of light sources.
What is Included with the Vernier Emission Spectrometer?
Spectrometer
USB cable
Software Requirements
Logger Pro®3 (version 3.8.6.2 or newer) software is required if you are using a
computer. LabQuest App version 2.2.1, or newer, is required if you are using
LabQuest 2. LabQuest App 1.7.1, or newer, is required if you are using the original
LabQuest. Visit www.vernier.com/downloads to update your software.
NOTE: Vernier products are designed for educational use. Our products are not
designed nor are they recommended for any industrial, medical, or commercial
process such as life support, patient diagnosis, control of a manufacturing process, or
industrial testing of any kind.
Safety
No user-serviceable parts are in this device. Do not attempt to open or modify this
device. Contact Vernier for all repairs and service.
Handle the device with care. This instrument can be damaged if it is dropped.
Do not use this instrument for clinical or diagnostic procedures.
Using the Vernier Emissions Spectrometer with Your Computer
Getting Started
1. Ensure Logger Pro software (version 3.8.6.2 or newer) is installed on your
computer before using the Vernier Emissions Spectrometer.
2. Connect the Vernier Emissions Spectrometer to your computer with the supplied
USB cable.
3. Start Logger Pro software on your computer.
Measuring Emission Spectra
You may use your spectrometer to measure the emission spectrum of a light source
such as an LED or a gas discharge tube. To do so, you may wish to purchase an
optical fiber assembly (www.vernier.com/VSP-EM) though this is not required.
Measure Intensity of Light Emissions
Intensity is reported in relative units with a range of 0–1. Note: The spectrometer is
not calibrated for measuring absolute intensity.
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Aim the sensor opening or the tip of the optical fiber cable at a light source.
Click . Click to end data collection.
If the spectrum saturates, displaying flat and wide peaks near 1.0, increase the
distance between the light source and the sensor or tip of the optical fiber cable. You
can also adjust data-collection parameters by choosing Set Up Sensors ►
Spectrometer from the Experiment menu. Reduce the Sample Time until peaks are
less than 1.0
Under some circumstances, you may want to intentionally saturate some peaks in
order to display weaker features. For example, in viewing a hydrogen spectrum, you
may safely saturate the red 656 nm line in order to see the blue lines near 400 nm.
Changing the Settings in Logger Pro 3
Spectrometer Dialog Box
The Spectrometer dialog box lists all the settings for the device. To display this box
choose Set Up Sensors ►Spectrometer from the Experiment menu.
For most experiments, the default settings work well.
There are four parameters listed in the dialog box.
Sample Time: this is similar to the shutter speed of a camera. Logger Pro has a
stored sample time. You may need to change the sample time manually.
Wavelength Smoothing: the number of adjacent readings on either side of a
given value that is used to calculate an average value. Large values will broaden
sharp peaks.
Samples to Average: the number of scans taken to calculate an average scan. Use
a value more than 1 to reduce noise.
Wavelength Range: the range is determined by the type of spectrometer in use.
By clicking on the picture of the spectrometer in this dialog box, you will gain
access to four options: calibrate, configure data collection, go to the support web
page, and units of measure. Click on an item to select it.
Overlaying Data on the Same Graph
You may wish to bring data from another Logger Pro 3 file into a current file. This
is easily done. Using the example of testing the fluorescent lighting in a classroom
for the presence of mercury, follow these steps in Logger Pro.
1. Measure the emission spectrum of a fluorescent lamp.
2. Open the File menu and choose Import From ►Logger Pro file.
3. From the Experiment folder, open Sample Data ►Physics ►Gas Discharge
Spectra ►Mercury.
4. Place your cursor anywhere on the Logger Pro graph screen and double-click. In
the Graph Options dialog box, click the Options tab.
5. In the Y-axis Columns box, open Run 1 and select the check box next to
Intensity. Click .

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Measuring an Emission Spectrum with a LabQuest
You may use your spectrometer to measure the emission spectrum of a light source
such as an LED or a gas discharge tube. To do so, you may wish to purchase an
optical fiber assembly (www.vernier.com/VSP-EM) though this is not required.
Measure Intensity of Light Emissions
Intensity is reported in relative units with a range of 0–1. Note: The spectrometer is
not calibrated for measuring absolute intensity.
Aim the sensor opening or the tip of the optical fiber cable at a light source. Start
data collection. Tap the red Stop button to end data collection.
If the spectrum saturates, displaying flat and wide peaks near 1.0, increase the
distance between the light source and the sensor or tip of the optical fiber cable. You
can also adjust data-collection parameters by tapping Sensors and choosing Data
Collection. Reduce the Sample Time until peaks are less than 1.0.
Sample Experiments
There are several experiments available for use with the Vernier Emissions
Spectrometer. Visit our web site (www.vernier.com/vsp-em) for more information.
Specifications
Dimensions 10.1 cm × 7.0 cm × 4.5 cm
Power supply USB powered
Detector Linear CCD
Wavelength range 350 nm–900 nm
Wavelength reporting interval 1 nm
Optical resolution* 3 nm
Typical wavelength accuracy† ±2 nm
*as determined by the full width of half maximum of Hydrogen 434 nm peak
†as determined by Hydrogen peaks. For best accuracy use an optical fiber.
Warranty
Vernier warrants this product to be free from defects in materials and workmanship
for a period of five years from the date of shipment to the customer. This warranty
does not cover damage to the product caused by abuse or improper use.
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Vernier Software & Technology
13979 S. W. Millikan Way Beaverton, OR 97005-2886
Toll Free [phone] [phone] FAX [phone]
[email protected] www.vernier.com
Rev. 1/2/2014
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