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16-10-200716-10-2007
mounted on a Tripod assembly and is levelled by means of adjustments on each tripod leg.
Between the Spectrophotometer and the Tracker is a control cable which carries positioning
commands from the Brewer electronics. The positioning commands are input to a motor driver,
which provides drive for a stepper motor. As the motor rotates, it turns a stainless steel vertical
shaft which, in a friction contact, rotates an aluminum plate fixed to the rotational body of the
tracker. The Tracker is fitted with an optical sensor which is used as a reference point, and a
'Safety Switch' which removes power to the motor in the event that a failure occurs in the reference
sensing system. The Tracker is fitted with its own power supply and power switch.
Table 2.5
Specifications for the Azimuth Tracker
Resolution
Accuracy (24 hours)
Max. slew rate
Max. angular excursion
Payload capabilities:
Max. static torque
Max. balanced weight
Operating temperature
range
Dimensions
Chassis Enclosure:
Height:
Power requirements:
2.3
COMPUTER EQUIPMENT
With the many different Computers available on the world market, it is not possible to qualify all of
them for use in a Brewer Spectrophotometer System.
For this reason KIPP & ZONEN recommends that the Computer equipment be purchased from
KIPP & ZONEN as part of the System, so that a total integration and test can be done prior to
delivery.
In the event that KIPP & ZONEN is not to be the supplier of the computer, then a few points must be
considered:
the computer must be IBM compatible.
•
•
DOS based computers are most reliable, and good success has also been
experienced with Windows 3.1.
problems have been experienced with Brewer / Computer communications using
•
some makes and models of Windows '95, Windows '98 and Windows NT computers.
speeds to 266 MHz in themselves have not posed serious problems.
•
while the Brewer operating software requires only a few MBytes of space, it is
•
recommended that a hard drive of at least 100 MBytes be used.
a 3.5" drive will be required.
•
•
the Brewer System requires one 25 pin serial port (9 pin needs adapter).
it is recommended that a dot matrix printer be attached to the computer (at least
•
during installation), so a printer port will be required.
±0.02° .
± 0.2°
3.91° /sec
o
o
-60
to +420
14.9 Nm
50 kg
o
o
-40
to +40
C
30.5 by 30.5 by 35.6 cm
91.4 cm, with tripod
45.7 cm (18 inch) without
tripod
120 V AC 60 Hz @ 0.5 A
240 V AC 50 Hz @ 0.25 A
MKIV OPERATOR'S MANUAL
2. SYSTEM DESCRIPTION
21
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