Scientech H410 Vector - Manual (Page 23)

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E. Press the ON/SELECT button. The attenuation factor is now active and the indicator will return to the
last operational state.
F. Press and hold the OFF/CANCEL until the display blanks to save the setting.
G. Press the ON/SELECT button to turn the H410 back on.
Attenuation factors can also be used to enable the H410 to display the correct reading when HD and HDX
calorimeters are used with wavelengths other than their calibration wavelength. See the discussion at the
beginning of this section for details.
10. Time Out:
Note: You must save all settings by pressing and holding the OFF/CANCEL button until the
display blanks. If the H410 is turned off, by using the ON/OFF slide switch, before settings
are saved they will be lost.
Note: The time out default is 10 minutes.
The time out feature conserves battery power by putting the H410 to sleep if there is no input from a detector
after a selected period of time. To awaken the H410 once it is in the sleep mode press the ON/SELECT button.
To enter into the time out mode:
A. Press the MODE button to start a menu cycle of J, W, CAL, tO and cd.
B. Press the ON/SELECT button when the tO annunciator appears. The current time out setting will be
displayed and SET will flash.
C. Press the RANGE (count up) and MODE (count down) buttons to change the desired number of
minutes, from 1 to 9999.
D. Press the ON/SELECT button. The time out setting is now active and the indicator will return to the last
operational state.
E. Press and hold the OFF/CANCEL until the display blanks to save the setting.
F. Press the ON/SELECT button to turn the H410 back on.
C
ORRECTING
A
STRAL
 S
ERIES
HD C
ALORIMETERS
O
PERATING
P
ARAMETERS
FOR
U
SE AT
D
IFFERENT
W
AVELENGTHS
:
NOTE: Due to variability in the manufacturing process the absorption characteristics of the HD and P
model detectors can vary in the UV region (190 to 400nm). Scientech recommends optical
calibration at 266nm if the detector is to be used in the UV region instead of relying on an
absorption rate in the chart at the end of this manual.
Scientech calorimeters in general have a flat response to all wavelengths within their specified spectral
response. HD and HDX calorimeters are an exception to that rule and are calibrated at a specific wavelength
by adjusting the calorimeter’s gain circuitry for that wavelength. The calibration wavelength is recorded in the
Operating Parameters section at the front of the manual and on the detector’s serial tag. When a HD or HDX
calorimeter is used at a wavelength other than the calibration wavelength, the indicator’s displayed value can be
adjusted to compensate for the absorption rate at the new wavelength by using an attenuation factor. The
attenuation factor is calculated as follows:
1. Find the absorption rate from the chart at the end of this manual for the calibration wavelength of your
calorimeter.
2. Find the absorption rate for the wavelength where you will be working.
3. Determine the attenuation factor using the following formula:
absorption rate of calibration wavelength = attenuation factor
absorption rate of the new wavelength
The attenuation factor can be entered into the H410 as described in step 9.