Kippzonen Brewer MkIII Manual do Utilizador descarregar pdf (Página 103)

MKIII OPERATOR'S MANUAL

100

Position 7 allows simultaneous observation through slits 3 and 5. Dark count-corrected counts are

stored in the BASIC F() array (refer to the Preliminary Data Reduction document for details). The

following algorithm is used to derive a value for instrument deadtime:

Assume Poisson statistics:

⋅−

⋅=

eNN

⋅=

log

where:

is the true count-rate (counts/sec),

N is the observed count-rate,

τ is the deadtime (sec). (The BASIC variable T1 is used for τ .)

1. As a first approximation set the true (unknown) count-rates equal to the observed count-

rates:

FF ←

2. Compute an estimate for deadtime:

log

⋅

←

3. Revise the estimates for the true count-rates:

⋅

⋅←

eFF

⋅

⋅←

eFF

4. Iterate steps 2 and 3 until the value for T1 converges.

Deadtime measurements are made at both high and moderate light intensity levels by using two

different neutral-density filter settings (positions 0, 1 for Filterwheel #2); five measurements are

taken at the higher intensity, ten at the lower intensity.

Method:

The command DT is issued.

Following the usual five minute lamp warm-up, and a further 10 minutes for test to run, results will

be printed in a format similar to the following:

FILTER #1/1 AND FILTER #2/0

GMT

DEADTIME

191054

4.94288936E-08

191119

4.81299056E-08

191143

4.93662915E-08

191208

4.91343971E-08

191233

4.84666031E-08

48.705 ± .6

APPENDIX F FACTORY TESTS

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 135 136

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