Microtops II Sunphotometer

MICROTOPS II is a 5 channel hand-held sunphotometer for measuring aerosol optical thickness easily, accurately and dependably. Direct solar radiation at 5 discrete wavelengths is measured and stored. MICROTOPS II features an accuracy comparable to much larger and more expensive instruments. Optional GPS receiver facilitates field operation. Choose five of eight available WMO wavelength filters or specify up to five custom wavelengths.

For more information on the Garmin GPS please visit www.garmin.com/products/gps12/

Field Carrying Case Now Available!!!

A new carrying case for the MICROTOPS II has just arrived. It provides excellent protection and toting convenience, perfect if you’re traveling by car, ship, plane, or you’re in the field. Check out some of the features below:

	Well padded, durable construction
	Adjustable shoulder strap
	Pouch for notepad, pencils, etc.
	Velcro strap to attach fellow GPS carrying case
	MICROTOPS II is fully operable while inside case

Applications

	Weather stations
	Scientific and educational studies
	Pollution monitoring
	Health care
	Material testing
	Photobiology
	Environmental monitoring

Features

	High accuracy. Highest grade filters are embedded into a solid cast aluminum housing which assures accurate, stable optical alignment. Low noise electronics and a 20 bit A/D converter allow high linearity, resolution and dynamic range.
	Ease of use. No computer knowledge is necessary to make measurements. Just aim the meter at the sun, align the image of the sun with the cross-hairs and push the button. In few seconds the measurement will be completed and the result stored in memory.
	Portability. A small hand-held device is all you need to perform measurements. No additional computer is necessary.
	Instantaneous results. The Aerosol optical thickness calculation algorithms are programmed in the MICROTOPS II and the final results of all stored scans can be conveniently viewed on the LCD. The raw data is also stored to allow retrospective adjustments of algorithms.
	Non-volatile memory. The raw data collected by the MICROTOPS II, as well as calculated results are stored in non-volatile memory. Each data point is annotated with date, time, site coordinates, solar angle, altitude, pressure and temperature.
	Low cost. By implementing the latest technology, instrument cost has been brought well below that of comparable sunphotometers, without sacrificing accuracy or features.
	Computer interface. Connection to a PC through a serial interface (RS232) enables transfer of collected data. MICROTOPS Organizer, a Windows-based software automates data retrieval and archiving.

Specifications

Optical channels	340 ± 0.3 nm, 2 nm FWHM 380 ± 0.4 nm, 4 nm FWHM 440 ± 1.5 nm, 10 nm FWHM 500 ± 1.5 nm, 10 nm FWHM 675 ± 1.5 nm, 10 nm FWHM 870 ± 1.5 nm, 10 nm FWHM 936 ± 1.5 nm, 10 nm FWHM 1020 ± 1.5 nm, 10 nm FWHM
Stray light	340nm: 1E-6 λ<650nm; 1E-5 λ<1.0μm 380nm: 1E-6 λ<650nm; 1E-5 λ<1.0μm 440nm: 1E-5 λ<1.0μm 500nm: 1E-6 λ<1.1μm; 1E-5 λ<1.2μm 675nm: 1E-6 λ<1.1μm; 1E-5 λ<1.2μm 870nm: 1E-6 λ<1.1μm; 1E-5 λ<1.2μm 936nm: 1E-6 λ<1.1μm; 1E-5 λ<1.2μm 1020nm: 1E-6 λ<1.1nm; 1E-5 λ<1.2μm
Resolution	0.1W/m²
Dynamic range	>300,000
Viewing angle	2.5°
Precision	1-2%
Nonlinearity	max 0.002% FS
Operating environment	0 to 50°C, no precipitation
Computer interface	RS-232C
Power source	4xAA Alkaline batteries
Weight	21 oz (600 grams)
Size	4"W x 8"H x 1.7"D (10x20x4.3 cm)

Ordering

Standard

	Microtops II Sunphotometer with 5 (selected) channels
	Barometric pressure sensor
	Hard-shell carrying case
	Serial port cable
	Instruction manual

Optional

	Choice of filters include: 340, 380, 440, 500, 675, 870, 936 and 1020 nm
	Water vapor column with 936 and either one or both 870 &1020 nm
	GPS receiver for automatic location setup
	Field carrying case
	MICROTOPS data organizer software for Windows
	Tripod adapter

MICROTOPS II SUNPHOTOMETER DATA FORMAT
(Some data columns omitted for clarity)

S/N	DATE	TIME	LAT.	LONG.	ALT.	PRES.	SZA	S380	S500	S870	S936	S1020	AOT 380	AOT 500	AOT 870	AOT 936	AOT 1020	WATER
4084	4/5/99	19:13:33	40.05	-75.13	20	1020	44.77	1072.36	636.33	699.46	941.37	1122.79	0.109	0.082	0.025	0.029	0.033	0.51
4084	4/5/99	19:13:44	40.05	-75.13	20	1020	44.79	1067.19	636.77	694.67	941.11	1122.96	0.113	0.081	0.03	0.032	0.033	0.5
4084	4/5/99	19:13:56	40.05	-75.13	20	1020	44.82	1065	635.86	692.83	935.15	1118.74	0.114	0.082	0.032	0.034	0.036	0.51
4084	4/5/99	19:14:08	40.05	-75.13	20	1020	44.85	1066.42	635.58	695.7	941.08	1120.86	0.113	0.083	0.029	0.032	0.034	0.5
4084	4/5/99	19:14:20	40.05	-75.13	20	1020	44.88	1068.81	635.88	694.49	942.81	1122.33	0.111	0.082	0.03	0.032	0.033	0.5