Melles Griot 13 PDC 001/IEEE User manual

Universal
Optical Power
Meter
13 PDC OOl/IEEE
Operator's
Manual

Operator's Manual
UniversalOptical Power Meter
13 PDC OOIAEEE
April, 1995
9072-9800
1B
Copyright Melles Griot. AU rights reserved
4665 Nautilus Court South
Boulder, Co. 80301
[phone] [phone]
Fax [phone]

Introduction ............................... 1
.......................
CopyrightandManual Notice 1
.....................
TrademarkAcknowledgements 1
...........................................
Overview 2
................................
Precautions 4
..............................
Power EntrySelection 4
............... Careand Handlingof Sensor Heads
4
..................
13 PDC 001 Specifications 6
....................................
Dynamic Range 6
....................................
Spectral Range 6
.....................................
Spectral Range 6
...................................
OperatingModes 6
.......................................
LCD Display 6
.......................................
Analog Meter 6
.....................................
GPlB Interface 6
.............................
AnalogMonitorOutput 6
TIAGain(VIA) ..................................... 7
GeneralandEnvironmental ........................ 7
Dimensions ..................................... 7
Weight ......................................... 7
Temperature .................................... 7
Input Power Requirements ...................... 7
Tilt Specifications ............................... 7
Analog Meter MovementAccuracy .............. 7
..................
DetectorAssembly Specifications 8
........................
Theory of Operation 9
FunctionalDescriptionof Switchesand
.............................
connectors I I

FrontPanel ....................................... 11
MeterZero ..................................... 11
NULL
.......................................... 11
Range
......................................... 11
Setup
.......................................... 11
....................
LEFTIRIGHT Arrow Key (a) 12
UPArrowKey(-)
............................... 12
DOWNArrow Key
C) .......................... 12
Rear Panel
........................................ 12
.....
CalibratedPhotodetectorHeadConnector 12
...... ....................
IEEE-488Connector : 12
...................
A.C. InputPower Connector 12
A.C. Power Selector
........................... 12
................. BNCAnalog Output Connector 12
System Operation - Front Panel Keys ...... 13
Introduction ....................................... 13
FactoryDefaultPower-Up
......................... 13
......
UnitSerial Number. Revision. andErrors 13
...... Connected DetectorStatus & Information 14
Default Power-Up MainDisplay
................... 15
................
Additional ExternalAttenuation 15
ExternalFilterStatus
........................... 16
NULL
.......................................... 16
IEEE-488Status
............................... 17
Analog MeterType
............................ 18
.....
Rear PanelBNC Output Transfer Function 18
......................... WavelengthIndication 19
ElectricalBandwidth Filter Indication
........... 19

..........
Display MeasurementUnits Indicator 20
Display MeasurementType lndicato ........... 20
................................
Range Indicator 20
..............................
IndicatorUpdates 21
................... .......
Range Control .. 22
..............................
Overrangecondition 22
.............................
Underrangecondition 22
..................................
RangeSelection 23
........................
FrontPanelRangeKey 23
.................
SelectingAuto or FixedRange 24
.........................
Fixed RangeSelection 24
.........
MinimumandMaximumFixedRanges 26
.............
FixedRangeFrequency Response 26
Setup ..................................... 27
................................
MainSetup Screen 27
..................................
Display Menu 28
........................
Wavelength Reference 31
..........................
OpticalFilterINIOUT 32
..............
Additional Beam PathAttenuation 32
...............
Electrical(A.C.) BandwidthLimit 33
........
Saving & Recalling13PDC 001 setups
34
....................
Analog MeterDisplayMode 36
...................
Display BacklightingControl 38
Display LCDForeground/Background ..... 38
................................
Control
.........
IEEE488 Communication Parameters 39
...........................
Status & Information 40
.......................
IEEE-488 Operation 42
iii

...............................
IEEE-488 Overview 42
...........................
Command structures 42
..............
On-Screen Troubleshooting Help 43
.......................
13 PDC 001 Commands 44
................
9.1.4. SCPl Status Commands 45
9.1.5.
MeasurementCommands .............. 46
......
9.1.6. Configuration Control Commands 47
........
9.1.7. User DefinedSensor Calibration 50
9.1.8.
Triggered Operation .................... 52
9.1.9. Data Buffer Retrieval .................... 52
13 PDC 001 ErrorCodes ................... 54
Suggestions on Power Measurement
...... 56
Appendices ............................... 58
Warranty Statement ............................... 58
Calibration Services ............................... 58
Service and Repairs ............................... 58
Sales Service and Technical Support Centers ..... 61

I. Introduction
1 .I Copyrightand Manual Notice
This manual describesthe operation of theMelles GriotUniversal
OpticalPower Meter System. Melles Griotreserves the right to
make changesto this manual and to the equipment described herein
without notice. MellesGriot has made considerable effortsto
ensurethat the information in this manual is accurateand complete.
However, Melles Griot
will not be liablefor any technicalor
editorialerrors or omissionsmade herein orforincidental, special,
orconsequentialdamages of any nature resulting fiomthe
hrnishing of this manual, or operation and performance of
equipment in connectionwith this manual.
0 Copyright 1995 by MellesGriot, Inc.. All RightsReserved.
I .2 TrademarkAcknowledgements
MELLES GRIOTQ is a registered trademark ofMelles Griot, Inc.
inthe United StatesofAmerica and certain other countries. In
France,
Germany, Italy, Belgium, TheNetherlands, and
Luxembourg,MEUESGRIOTQis a registered trademark of
Melles Griot
B.V.
All other product names and company names aretrademarksand
registered trademarks of other manufhcturers.
m81l5 -9072-98001B pg. 1

1.3 Overview
IWlZURATlNO WHERE ~DRA'lW~ IPHm
51 ISPDHWI
91 1SPMOD6 EU 13PDH003
GE 13POHlOl
0E 1SPDHlO6 GI 13PDHIOQ
(4
amDcooa
--
mR -
VII)
--.
1.3.0.1 -- 13 PDC 001 Control Unit and Detector Assemblies
The Melles Griot 13
Universal OpticalPower Meteris a
versatile, microprocessordriven controlunit that operates
in
conjunctionwith a variety of detectorassembliesasillustrated in
figure 1.3.O. 1. The control unit supportsdetectors with
responsivitiesbetween 300 and 2000 nrn and can measurepower
levelsfrom
5 picowattsto 2 watts. The associated detector
assemblies
are equipped with a cableresident programmable
memory that storescalibrationcoefficients necessary to achievethe
absoluteaccuracy from assemblyto assembly. When the detector
cable isattached tothe controlunit, the calibrationdata is
automaticallyread by themicroprocessor
and all power
measurementsare adjusted forthe unique response characteristics
of an individual detectorassembly. Themeter provides setupmenus
and data readout through a 64 x 192 pixel, electro-luminescent

backlit Liquid CrystalDisplay (LCD) and six fiontpanel selection
buttons.
The instrumentmeasures and computessignalAverage,
true
RMS, AC coupled true RMS, Peak, and Peak-to-Peak.
Measurementsmay be displayed in units of watts,
dBm, or detector
current.
An illuminated needle meter providesinstantaneous
feedbackof percent modulation or percent deviation of signal
average. Thisfeatureis valuable fortuning lasersand for optimizing
thethroughput of fiber coupled systems. The 13PDC 001 comes
equipped with a calibrated analog outputand
also has an optional
IEEE 488.2 communications/controlinMce. All functions and
data are programmablethroughthis interface. TheUniversal
OpticalPower Meter is packaged in a compact enclosurethat easily
tilts and holdsbetween -20 degrees and +20 degreestothe
horizontal. The unit
has provisionsfor input power operationfiom
90-125VAC and 200-24OVAC.
Sixprimary detectorconfigurationsare available. Silicon
(400-
1 100 nrn) and germanium detectors(800-1800 nm) are
availablein one of three calibrated configurations,a bare detector
assembly, with a 50mm integrating sphere, and with a 152mm
integratingsphere. Thebare detector assembliesare provided
with
ND 3 attenuatingfiltersforuse at high optical power levels or at
high opticalpower densities. The calibrationdata includes
coefficientsboth with and without the attenuator. These detector
assemblieshave a particularly convenientfeaturethat permits
storageof theattenuatorwhen not in use. Also, the detector
assembliesarecompatible
with the popular 13DMA seriesmodular
mounting accessoriesfor photodiodes. Fiy,the
13 PDA seriesof
accessoriesprovides compatibility
with the more common fiber
opticconnectors. These accessoriesare compatiblewith
all of the
13PDH seriesdetectorand integrating sphereassemblies.

13PDCOOl POWER METER w/ IEEE
Corrections for the fusevalues
We regret that the fusevalues were printed in error. Pleasemake the
followingcorrectionsto the manual.
mELLES 6110i 9072-98001Rev B
1001120VAC
Fuses
0.25A,
5x20mrn, SB,
111, 218.250,
2201240VAC
Fuses
0.125A,
5x20mm7SB,
111, 218.125,
QTY
2 ea.

2 Precautions
2.1 Power EntrySelection
The 13 PDC001 will accept A.C. power inputsat 'standard
voltages' of
1 10 or 220 V (50 or 60 Hz). Before applyh~! AC
power to the instrument:
1) Install the correct hsesforthe linevoltage being used. Two 250
mA, and two 500 mA hsesare supplied with the instrument. The
250 mA fusesare foruse with 220-240 VAC operation, and the
500 mA fusesare foruse with 90-120 VAC operation.
2) Ver@that the power entry selection switchon the rear panel of
theunit ispositioned to match your power. The selector switchis
set by using a coin or screwdriverto align the correct voltage
reading
(" 110v" or "220~") below the arrowprinted on the selector
switchhousing.
2.2 Care and Handlingof Sensor Heads
The followingprecautions shouldbe observed when handling and
using the
13 PDH detectorheads.
The post mountable silicon and germanium detectorheads
(13 PDH
00 1 and 101) come equipped with an attenuatingfilter. When
inserted in fiont of the detector, thesefiltersnot only help prevent
detectorsaturation,but
also prevent dirt and dust fiom
accumulating on the detectorface
and degradingthe detector's
measurement accuracy. Itis suggested that the attenuatingfilterbe
used whenever possible. Ifthepower level ofthebeam under test
requiresthe filterbe removed, it isrecommended that the filterbe
attachedto the rear side of the detectorhousing for safe storage.
After the measurement iscomplete, make sureto reattach the filter
to the entrance side of the detectorassembly. This
will help keep
the detectorhce clean. Ifdust accumulateson the detectorface
use filtered, dry
air to cleanit before reattaching the filter Never
touchthe detectorface
with any object as permanent damagemay

occur. Fingerprintsand residuefiomcleaningfluids will seriously
degradethe system's
NEP.
Caremust also be used when hading the 50 mm and 152 mm
integratingsphereldetectorcombinations (13 PDH 003, 103,005,
and 105). The spectralcalibrationof theintegrating spherescan be
degraded
if the sphereis dented as a result of being dropped, or if
objectsor contaminantsgetinside ofthe sphere. It isrecommended
that theintegratingsphere's input port cover be used when the
sphereisnot being used for a power measurement.
IIIBLLES -9072-98001B pg. 5

3. 13 PDC 001 Specifications
Dynamic Range
10-l2 W to over 2 W (with ND filter).
Spectral Range
300 nm to 2000 nm (selectable in 1 nm increments).
(Allowable range determined by calibrated head installed)
Operating Modes
The 13 PDC 001 will displayreadings in units of watts, dBm, and
detector current. The instrument
will compute signal Average, true
RMS,
AC coupled true RMS, Peak, or Peak-to-Peak. Section
8.1.1 describesthese operatingmodes in detail.
(Power ranges only available with calibrated head installed)
LCD Display
64 x 192 pixel, EL backlit.
Power is displayed
in 4 digits. Other operationalinformation is
displayed
as required.
Analog Meter
Selectable, percent deviationor percent modulation.
GPlB Interface
EEE 488.2, SCPIcommand syntax.
Analog MonitorOutput
Level: +1 volt nominal
&5 volt maximum (over-range)
Impedance: lh
ScaleFactor: Displayed on LCD screen
(The scale factor is a fimction of wavelength calibration)

TIA Gain (VIA)
Analog Output Bandwidth
1 0l0 30 Hz
lo9 loo HZ
lo8 300 Hz
1 o7 1m
1 o6 30 kHz
lo5 10 k~z
lo4 30~*
I o3 OW*
* (The displayed data in these rangesis limited to 25KHz by
the ADC input filterbandwidth.)
The above bandwidths correspond to a given feedback nsistance in the 13
PDC 001 input transimpedance amplifier. The actual bandwidth for any
given power setting is dependent on the calibrationfactor (in amps per
watt) ofthe detector attached to the 13 PDC 001
Generaland Environmental
Dimensions
191- (7.5") W x 1331nm (5.25") H x 108mm(4.2S1') D.
Weight
< 2.5 Kg (5.5 lbs).
Temperature
0 to 55 "C storage; 10 to 40 "Coperating.
InputPower Requirements
90-120 VAC or 200-240 VAC 50160 Hz,
selectedby rear panel switch.
Tilt Specifications
a0 degreefiomhorizontal.
Analog Meter MovementAccuracy
The needle movement onthe analog meter is +5% of fill scale
reading,
in either "% Modulation"or "% Deviation"mode.

3. I DetectorAssembly Specifications
CMULS -9072-98001B pg. 8
Attenuation
NEP (Watts RMS)
NoAttenuation
Attenuation
Power
Density
at Detector (uwld)
Display Resolution
Display Bandwidth
(Mi-)
NIST Calibration
A-9'
5nW-2W
~PW
5nW
100
4 digits
lOW5lcI-IZ
NoAtten:
f 3%
Atten: f 4%
da
250pW
da
da
da
2nW
da
n/a
1OuW-1W
lOnW
lOuW
100
4
digits
10Hz/25kHz
f 5%
4
digits
10Hz/25ktIz
NoAtten:
f 5%
Atten:
f 10%
4
digits
lOHz125kHz
f 5%
da
0.5uW
da
da
da
4uW
da
da
4 digits
lOHz/25kHz
f lCP!
4
digits
lOIW2SlrHz
f1W

4. Theory of Operation
The figurebelow showsthe 13 PDC 001functionalblock diagram.
Operator control of the unit isthroughthe eightfiont panel keys
and the optionalIEEE-488 interface. The output of the unit
consistsof the
LCD display, the analog monitor output, and the
optionalIEEE-488 interface.
Thecurrent &om a photodiode operatingin the photoconductive
mode provides the input signal. Thephotodiode isoperatedwith
zero reverse bias to eliminate any dark leakage current. Theinput
currentis convertedto avoltageusing a standardTIA
(trans-irnpedence amplifier) with eight
gain ranges fiom ld to 10"
voltsper ampere.
4.0.0.1 -- 1 3 PDC 001 Functional Block Diagram
maLLS -9072-98001B pg.9

Thebandwidth of the output is limited by the TIA and thefollowing
filteramplifier. Thisfilter amplifieris used to implement the user
optional
30Hz band limit. The band limited signal isthen scaled by
a multiplyingDAC (Digital to Analog Converter) to produce a
1.0
volt kll scale signalat theoutput BNC connector.
The output signalis
then passed through atwo pole, 25 Wk
anti-aliassingfilter amplifierbeforebeing digitid by the ADC
(AnalogtoDigital Converter). TheADC convertsat 48 thousand
samplesper second. The output of the ADC istransferred tothe
microprocessor memory using
DMA (Direct Memory Access).
Once signal
data iscollected it isprocessed in blocks of 1024
samples forupdating the analog meter and in blocks of 16,384
samplesforupdating theLCD display. Using calibration
informationand operator inputs the microprocessorgeneratesthe
desired displayinformationand drives theLCD and analog meter.
The unit has the capabilityof ofBethg or
nulling an input signal
which can be equalto the
fbll scale signal in any given range. When
'TKJLL'' is selectedthe unit measuresthe minimum signaland using
a DAC subtractsthe correct amount of current atthe input to zero
that signal. Becausethenulling takes place atthe input of the
TIA
rather than in the post processing, no accuracy islost as a result.
Thelast functionontheblock diagram isthe optional
IEEE-488.2
interface. The IEEE interfaceprovides all the hnctionswhich are
availabletotheuser from the fiontpanel plus addition data transfer
modes.
RIBUES -9072-98001B pg. 10

5. Functional Description of
Switches and connectors
5.1 Front Panel
5.1 .I MeterZero
Thiskey zerosthe analogmeter to the center of the % Deviation
scalewhen in the
% Deviationmode. Thiskey has no effect on any
offset
NULL value (section 4.1.2) appliedtotheinput signal level,
and
has no effect onthe meterwhen operating the analog meter in
the
"% Modulation" mode.
5.1.2 NULL
The NULL key establishesorremoves an offset value to the input
signal.
When a null is set, the minimum input signalvalue is
electronicallysubtractedin hardware hmthe input signal.
Subsequentdisplay readings and the analog output (rear panel
BNC
connector, section 4.2.4) are based on that value as a new "zero
reference". This key
will have an effect on the analog meter in
eitherthe
"% Modulation" or "% Deviation" mode sinceit
establishes(or removes) a zero referencepoint with respect to the
input signal.
5.1.3 Range
The RANGE key allows theuser to select autoormanual range
mode. The key is activewhen the
"main" displayispresent (section
9, and is not activeunless that screenis displayed. See section 6
forfurtherdiscussion of ranges.
5.1.4 Setup
Pressingthe SETUP key when the "main"display
is present will
causethe instrumentto displaya setupmenu, with a list of setup
options. Pressing this key &omthe setupmenu (or
any menu below
the setup menu)
will alwaysreturn theinstrumentback tothe
"main" display screen. Instrument setupis discussed beginning with
section
6 of this manual.
maLES -9072-98001B pg. 1 1