Varian ProStar 325 UV-Vis, Руководство по обслуживанию

Страница: 73 / 149

ProStar325 Service Manual
Publication date 8 May 2003
73
4 Electronics
4.1 Introduction
The electronics system in the ProStar 325 detector provides the
interface between the optical measurement system, including any
accessories. Communications is either through an external host
computer connected via Ethernet or Pocket PC communicating
through a standard IrDa interface running as a Star workstation.
The instrument electronics control all necessary parameters of
the optical system to enable a photometric reading to be made at
a specified wavelength. Results are then transmitted to the host
computer for analysis.
The power supplies for the detector are delivered from two main
OEM power modules and from the main Processor PWB. All
processing of digital and analogue signals (including accessory
signals) are also handled by this PWB
Mains supply for the instrument enters through a Corcom filter
network and varistor combination, which help to suppress
transient disturbances. Overcurrent protection fuses 1FS1 and
1FS2 are mounted on the rear panel. The fuses are T3.15AH250V
and are contained in the input module.
The two OEM supplies are universal mains switchmode supplies
with an input range of 85 – 264VAC at 50–60Hz +/-1Hz.
4.2 OEM power supplies
The two main power supplies in the detector supply the following
voltages;
Power Supply #1: +24V, 65W
Power Supply #2: +5V, +/-12V, 40W
4.2.1 Low voltage power supplies
The +24V power supply is used to feed the switch mode supply
circuits for the two lamps and supply the grating drive motor
circuit.
The +5V supply is used to generate the +2.5V and +3.3V
necessary for all the digital logic circuits.
The +12V and -12V are used to generate the +9V and -9V used for
the analog circuit supply.
StockCheck.com