A 2-Pt.Up/Dn recalibration should be done outside on a clear sky day.
If the radiometer has any bands 1100 nm or higher, allow at least fifteen minutes for the radiometer to adjust to the outside temperature.
To perform a 2-Pt.Up/Dn MSR Calibration, do the following:

1) Bring up the MSR MAIN MENU.

MSR MAIN MENU 1 Config-Status 2 ReConfigure 7 Memory Card 3 Retrieve Data 8 MSR Program 4 Clear Data 9 Exit MENU 5 View 10 BYE Enter Selection/Command *2

2) Select #2 to display the RECONFIGURE MSR menu.

RECONFIGURE MSR 1 Date 6 Location 11 Calibrate 2 Time 7 Record 12 Power-Off 3 SS 8 Samples 13 Mode 4 Rem 9 GMT Difference 5 ID 10 IRR M Main Menu Enter Selection/Command *11

3) Select #11 to display the CALIBRATION COEFFICIENTS menu.

CALIBRATION COEFFICIENTS 1 Enter Calibration 2 Display Calibration 3 Recalibrate M Menu Enter Selection/Command *3

4) Select #3 to display the RECALIBRATION menu.

RECALIBRATION 1 IRR 2 Two-Point 3 White-Standard Up & Down M Menu Enter Selection/Command *2

5) Select option #2 to begin the MSR 2-Pt.Up/Dn recalibration reading steps. The following will appear:

MSR CALIBRATION POSITION AT 45 DEGREES ON BLACK CARD PRESS ENTER WHEN READY

6) Position the MSR 2-Pt.Up/Dn Calibration Platform (MSRCP) on a flat surface with the black side up and positioned so the shadow from the side closest to the scratch line is cast to the scratched line for a 45 degree sun angle. If you do not have a 2-Pt.Up/Dn Calibration Platform (MSRCP) you may use some other flat surface adjusted so the sun strikes the surface at 45 degrees.

Set the radiometer on the platform as shown below. If you are not using the MSRCP, be sure the bottom side of the radiometer is covered with a dark card while the radiometer is at a 45 degree sun angle.

Stand to the side and as much below the plane of the surface of the radiometer as possible, to minimize any reflections from you or your clothing on the radiometer. Press Enter, as instructed. The incoming irradiance reading is made by the up sensors. The DLC will beep after the readings are complete and the following will appear:

PLACE WHITE GLASS OVER TOP SURFACE PRESS ENTER WHEN READY

7) Place the white calibration plate over the top surface of the radiometer, as shown below. Again, stand to the side and as much below the plane of the surface of the radiometer as possible and then press Enter. The calibration plate reading is made by the up sensors and the down sensor dark millivolt readings are made by the down sensors, covered by the dark card or platform surface, at this time.

TURN RADIOMETER OVER ON BLACK CARD (45 DEGREES) PLACE WHITE GLASS OVER SURFACE PRESS ENTER WHEN READY

8) Turn the radiometer over, so the normally down-sensors (clear-glass side) are up and the normally up-sensors (white glass side) are down on the platform.

Place the white calibration plate on top, as shown below. Again, stand to the side and as much below the plane of the surface of the radiometer as possible and then press Enter.

The calibration plate reading is made by the down sensors and the up sensor dark millivolt readings are made by the up sensors, covered by the dark card or platform surface, at this time. The DLC will beep after the readings are complete and the following will appear:

Calculating...

At this point the calibration constants are calculated and placed in the Calibration Constants table.

MSR Serial# (170):

If the prompt for MSR Serial number appears (MSR5 and MSR87 radiometers) and your radiometer serial number appears in the parenthesis, just press Enter. If the correct serial number does not appear type the correct number and press Enter. This prompt will not appear for MSR16 radiometers and it is required to have previously entered the MSR16 module serial numbers in the Calibration Constants table.

RECALIBRATION 1 IRR 2 2-Pt.Up/Dn 4 WhiteStd.Up/Dn M Menu Enter Selection/Command *M

This completes the 2-Pt.Up/Dn recalibration. Enter the M option to return to the prior menus.

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