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MKIII OPERATOR'S MANUAL

106

Method:

The method by which direct-sun O

and SO

values are derived from the raw photon counts at the

five operational wavelengths is outlined in sections 2 and 3 of Preliminary Data Reduction. After

corrections for dark count, deadtime, Rayleigh scattering, and instrument temperature have been

applied, the O

and SO

(MS(11) and MS(10)), values are calculated using the following formulae:

1)9(

)11(

BMS

⋅

−

←

−

⋅

−

⋅← )11(

2)8(

)10( MS

BMS

where

MS(8) is the weighted double-ratio for SO

MS(9) is the weighted double-ratio for O

A1 is the differential O

absorption coefficient for the O

ratio

B1 is the extraterrestrial constant for the O

ratio

A2 is the relative SO

to O

absorption for the SO

ratio = (2.44)

A3 is the differential O

absorption coefficient for the SO

ratio

B2 is the extraterrestrial constant for the SO

ratio

M2 is the airmass, also referred to as MU.

The method to determine the four instrument-dependent values (A1, B1, A3, B2) for a particular

instrument via the Inter-Comparison Calibration procedure is outlined below.

Many simultaneous direct-sun measurements (at least 40) are made with both the instrument to be

calibrated and a reference instrument. Measurements should be taken over a wide range of

airmass values (1.0 < mu < 3.0) for at least one full day of good observing conditions. The O

and

values (MS(11) and MS(10)) are determined from the measurements made with the reference

instrument. These values, together with the values of MS(8), MS(9), and M2 valid for the

instrument being calibrated are substituted into the above two equations which are rewritten as

follows:

MS(11) M2A1B1 MS(9) ⋅⋅+←

MS(11)] M2 MS(10) A2 [M2 A3B2 MS(8) ⋅+⋅⋅⋅+←

Two least-squares linear regression fits are applied to these equations and the resulting two pairs

of regression coefficients (B1, A1; B2, A3) are the four instrument-dependent coefficients.

As for all previous tests, consult EC or KIPP & ZONEN prior to altering any of the constants in the

instrument Constants File.

AZ: ZERO THE AZIMUTH TRACKER

The AZ command re-orients the Azimuth Tracker to its zero-step position. This routine is activated

automatically following a system reset (RE command). The operator should use this command if

there is concern that the azimuth drive has lost track of where it is for such reasons as temporary

power loss to the Tracker or other physical disturbance.

Note that the AZ routine can only be accessed if the instrument configuration (IC) is setup to

include an Azimuth Tracker System.

APPENDIX F FACTORY TESTS

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 135 136

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