Zeiss humphrey HFA II-i series, Руководство по обслуживанию на месте

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FA2i-026 Page 3
3.0 ‘After Calibration’ Verification Data (App H.2)
3.1 Total Working Wedge Attenuation ___________________
3.2 Your ‘After’ foveal threshold ___________________dB
3.3 White Projector Voltage Drop ___________________v
3.4 dB Spread (White) ___________________dB
3.5 Reading in FT-L for 29db ___________________FT-L
3.6 Reading in FT-L for Bowl (White) ___________________FT-L
3.7 *Blue Projector Value ___________________v
3.8 *dB Spread (Blue) ___________________dB
3.9 *Reading in FT -L for Bowl (Yellow) ___________________FT-L
* For instruments equipped with Blue/Yellow only
4.0 Worksheet (App I)
dB ratio = 10*Log(BKGDFtL / #37FtL)
Note : #37 is the same Ft-L value as the 29 dB data point on the White Light Verification Printout.
1. Using above formula & values from the BEFORE White Light Verification Data Printout,
find the OLD dB ratio: dB
2. Using above formula & values from the AFTER White Light Verification Data Printout,
find the NEW dB ratio: dB
3. Find the dB shift: dB
(OLD dB RATIO) – (NEW dB RATIO) = dB shift
Do you need to leave the calibration notice?
1. If dB shift is +/- 1dB,
DO NOT
leave the notice.
2. DO NOT
include (+) or (–) signs on the notice.
3.
If dB shift is (+), select
low
on the notice.
4.
If dB shift is (–), select
high
on the notice.
5.
If ±1dB or greater shift, leave the cal notice.
6. If ±4dB or greater shift, call your regional manager.
Leave Notice?
0
Yes
0
No