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MKIII OPERATOR’S MANUAL

103

Method:

Type SL. The test runs through the same temperature and foreoptic positioning procedures

described in HG, then waits the obligatory five minutes for the quartz-halogen lamp to warm up.

The program then conducts seven measurement runs over the dark-count channel and the five

operational wavelength channels. Each run cycles the slitmask through 20 oscillations,

accumulating the photon counts in the BASIC one-dimensional F() array (described under

Preliminary Data Reduction). These raw counts are printed in the following format:

Brewer Temp = 27 C ( 3.56 V)

C.U.T.

ZEN

DRK

SL0

20:54:25

65.63

2.384

1102112

1052861

1066768

956627

820941

SL0

20:55:02

65.67

2.388

1101966

1054190

1067478

957870

821186

SL0

20:55:40

65.72

2.392

1102630

1053024

1067318

958662

821366

SL0

20:56:18

65.76

2.395

1101330

1054009

1068002

957890

821567

SL0

20:57:02

65.81

2.4

1101960

1053736

1068197

957257

820730

SL0

20:57:46

65.86

2.404

1102690

1052931

1067378

959002

821232

SL0

20:58:24

65.9

2.408

1102507

1053022

1067047

958135

822097

The SL0 indicates that the Standard Lamp test was performed with Filter Wheel #2 in position 0 (ie

no neutral-density attenuation). CY is the number of slit-mask oscillations over which the counts

were accumulated. ZEN and MU are the current solar-zenith angle and airmass respectively (these

are irrelevant to the SL test and are presented for operator information only). The next six columns

are the photon count totals for the dark channel and the five operational channels. When all seven

measurement runs are complete the program corrects the raw photon counts for dark count,

deadtime, and temperature-dependence, then prints a series of summary statistics:

20:56:22 Feb 21/85 65.763 2.395 27 C DEG SL 0

Mean1

mean5

MS(4)

MS(5)

MS(6)

MS(7)

MS(8)

MS(9)

1102170

821302

-623

-426

-488

-694

596

418

+ 483

+ 445

+ 3

+ 5

+ 4

+ 15

+ 9

The first line shows the time, date, solar-zenith angle, airmass, instrument temperature and test

identification. The second line of data displays the mean corrected count for channels 1 and 5, the

single-ratios MS(4) through MS(7), and the double-ratios MS(8) (the SO

ratio), and MS(9) (the O

ratio). The derivation and interpretation of these values is detailed under Preliminary Data

Reduction.

The third line of data shows the standard deviation for each of the quantities in the line above

(there is no ASCII symbol for '±', hence the leading '+' sign).

The single-ratios MS(4) through MS(7) should remain reasonably constant from test to test; the

allowable drifts in the SO

(MS(8)) and O

(MS(9)) double-ratios are about ±1.5%.

THERMAL TESTS

The Thermal Tests consist of a battery of diagnostics which determine the extent to which the

spectrophotometer's performance is affected by temperature.

Measurements are made with the quartz-halogen (standard) lamp. Light intensity measurements

are taken at a number of points which span the temperature range -10 to +40 °C. The wavelength

setting must be recalibrated (via the HG command) at each new temperature before the standard-

lamp intensities are measured. These intensity data are analyzed to yield the absolute temperature

coefficients for each of the five operational wavelengths; the negative of each coefficient is stored

in the instrument Constants File for subsequent use during data reduction.

During the course of the Thermal Tests all of the Brewer electromechanical subsystems should be

thoroughly exercised, and any malfunction corrected.

The PRFILE.BAT program is used to process the data and determine the temperature coefficients

for the brewer.

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 135 136

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