Irradian PM203 Mode d’emploi
Handbook Ref No. MH065/Issue I
File Ref: PM203V3I.doc
1. Introduction
2. Specification
3. Operation
4. Battery Replacement
5. Calibration Description
6. Block Diagram
7. Programming via the RS232 interface
8. Environmental care, recycling and disposal
PM203 Radiometer Irradian Limited
1
The Irradian PM203 Optical Power Meter is a portable instrument
designed for accurate measurement of monochromatic light radiation in
Watts, dBm and dBr, covering the ultra violet visible and near infra red
parts of the spectrum.
The meters comprise of a hand held display unit, with microprocessor
control and a large led backlit 4½ digit liquid crystal display. The remote
detector assembly includes a multi-range amplifier and digitiser for low
noise measurements. The RS232 cable supplied allows connection to a
COM serial port on a computer for remote control and data logging.
Irradian Limited PM203 Radiometer
2
DISPLAY UNIT
Controller: 80C51 8bit micro-processor with a 3.1684MHz
clock.
Memory On board non volatile RAM for calibration
factors and set-up parameters.
Key Operation 8 switch key board with 9 LED indicators.
Power Switch Microprocessor reset at switch on.
Unit settings stored prior to shut down.
Serial Interface Three wire RS232 serial interface.
4800 baud, no parity, 1 stop bit.
Integration Time 0.33s
Conversion Scale 17 bit
Accuracy: Measurement accuracy ±1digit with a
linearity error of <1%.
Display: 4½ digit lcd display. Character height 10mm.
Display illumination: A LED back light can be switched on to
illuminate the display for readings in low
ambient light situations.
Power Supply: 9 volt PP3 battery.
Power Consumption: Shut down mode <5µA
Operating 10 - 20mA
LED back light ~20mA
Battery Life ~ 50 hours without back light use.
Irradian Limited PM203 Radiometer
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(continued):
Standard Ranges:
5 full scale decades measuring from:
0 to 19.999 nW
0 to 199.99 nW
0 to 1.9999 µW
0 to 19.999 µW
0 to 199.99 µW
Resolution 0.001 nW on range 1.
Extended Range Option:
5 full scale decades measuring from:
0 to 199.99 nW
0 to 1.9999 µW
0 to 19.999 µW
0 to 199.99 µW
0 to 1.9999 mW
Resolution 0.01 nW on range 1.
Attenuators: Other measuring ranges are available when
the optical power meter is used in conjunction
with a calibrated attenuator or integrating
sphere.
Calibration Absolute calibration is traceable to National
Standards.
±5% - 400 to 1100nm.
±7.5% - 240 to 400nm.
Irradian Limited PM203 Radiometer
4
(continued):
PM203 Optical Power Meter
DETECTOR RS232
Figure 1
4½ digit LCD display
Measurement select button
Display backlight button
λselect decrease button
Background ZERO button
λselect increase button
Mode RESET button
Display HOLD Function REF button
Auto/manual RANGE button
Power switch button
Irradian Limited PM203 Radiometer
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(continued):
Front Panel Controls:
RANGE Select auto ranging or manual range control.
UNITS Select between power in Watts (mW, µW and
nW) and dBm or relative dBr.
ZERO Initiates a zero or background measurement
routine on all five ranges.
HOLD/REF Display is held at present reading until HOLD
button is pressed again.
Select to set the reference level in dBr relative
measurements.
RESET Press to switch between 5nm λSelect and
Preset wavelengths.
λ
SELECT Use the
buttons to change the calibration
wavelength in 5nm steps throughout the range
of the detector or to select from the preset
wavelength table.
Power on / off button
Display backlight on off button.
Display backlight will switch off after a
programmable delay, factory setting 60 secs.
Connectors: 8 pin DIN type detector connector.
5 pin DIN type RS232 connector.
Temperature Range: 0 to 40°C. 80% RH.
Dimensions: 150 x 80 x 45mm.
High impact polystyrene.
Weight: 350g
Irradian Limited PM203 Radiometer
6
(continued):
LABORATORY DETECTOR, DET203PM
Amplifier PCB Photodiode
Cable
Accessory Mounting Thread
The DET203PM laboratory detector comprises of an aluminium housing,
photodiode and PCB assembly.
Detector: 100mm² silicon photodiode.
Spectral Response Ref. Figure 2
Temperature Coefficient: ~0 %/°C from 300 to 940nm
Amplifier Gain 10
8
V/A to 10
4
V/A
Current to Frequency 0 - 0.5Mhz
Linearity Error: <1% from 1nW to 100µW
Temperature Range: Operation: 0 to +40°C
Storage: -20 to +60°C
Detector Housing: Black anodised aluminium alloy housing.
Each optical accessory screws into the detector
housing on a 1.125" x 20 T.P.I.
The detector amplifier is connected to the
display unit via a multicore cable to a eight pin
DIN type connector.
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