Table of Contents
Advertisement
6.
Set the multi-meter to DC VOLTS. The meter should display 3 decimal places. Note that on
the Fluke multi-meter the yellow button must be held while turning on the meter in order to
display three decimal places.
7.
Allow the lamp to warm up for about 10 minutes. Periodically adjust the voltage to maintain a
stable level of 12.000 +/- 0.003 volts.
NOTE: The external tungsten-halogen lamp should be operated at a constant ambient
temperature. For this reason, it is recommended to perform the stability check on a dry day
when the winds are calm.
Computer Set-up:
1.
Press Home to interrupt the Brewer schedule and return control to the Main Menu screen.
2.
Issue the o3hg commands. The o3 will insure that the Brewer is in the ozone mode, and
after a 5 minute lamp warm-up, the HG will perform a wavelength calibration.
3.
Type the command sequence pnb1qshg and press Enter.
-
pn turns on the printer
-
b1 turns on the HG lamp
-
qs initiates a "Quick Scan" of the UV lamp
hg does a mercury line wavelength calibration
-
4.
When prompted to do so, enter the following:
-
the 3 digit lamp number.
-
press Return when prompted to confirm detector distance is 5 cm.
-
if the voltmeter is stable at 12.000 volts, press delete to bypass lamp warm-up delay.
5.
The software will then initiate the four commands in sequence and print the results.
The "quick scan" print-out lists the following:
-
time, in decimal hours from UT midnight
-
measurement wavelength, in nm.
-
step position of micrometer from zero
-
intensity of reading
-
percent change from initial qs measurement
Subsequent Lamps:
1.
After the "quick scan" has finished, the UV lamp power supply can be turned off and the
VERY HOT lamp can be removed from the socket. The lamp should be allowed to cool
adequately prior to storing back in the case.
2.
Repeat steps 3 and 4 for each lamp to be scanned.
CAUTION! These lamps have a limited life expectancy. Do not leave the lamps on for an
extended period.
56
MKIV OPERATOR'S MANUAL
Advertisement
Table of Contents
