YSI 9300 Photometer - Manual (Page 20)

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Reading in Transmittance and Absorbance
When taking readings in Transmittance or Absorbance mode, use the  and

keys to step through the wavelengths until the required wavelength is
reached.
Timer
The photometer features a countdown timer with alarm as an aid to carrying
out test procedures. The timer can be accessed at any time by selecting
‘Timer’ from the ‘Options’ menu.
The following display will appear:
Key in the time required in minutes and seconds using the numerical keys,
then press [OK] to start the timer. The maximum time is 29 minutes and
59 seconds. Use the  and  keys to reposition the cursor and re-enter the
time if it is keyed in incorrectly.
The timer will count down, giving an audible alarm at the end of the timed
period. Press [OK] to stop the alarm.
During the timer countdown period, an ‘Options’ menu is available :
Stop
- used to abort the timing operation or to stop the alarm at
the end of the timed period
Exit - used to return to the program screen to take readings. The
timer will continue to run and give an audible alarm at the
end of the period.
Exit and Read - used to return to the program screen with the timer counting
down on screen. The instrument will automatically take a
reading at the end of the timed period and no alarm will
sound.
User Defined Tests (9500 Only)
Users may wish to develop their own test methods and store the calibration
data on the 9500. This will allow direct reading of user tests. The 9500 has
the facility to store up to 30 user-defined calibrations.
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