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Calibration

Overview

User

Calibrations|Optical

and

Electrical

T

able

3-2.

Optical

and

Electrical

Channel

User

Calibration

Summary

Calibration

What

is

calibrated

Measurements

Aected

Recommended

Interval

K

ey

Path

O/E

User

W

avelength

Calibration

The

photodetector

responsivity

Channels

aected:

optical.

All

optical

channel

measurements

at

user

wavelengths.

Annual

re-calibration

of

user

dened

non-factory

wavelengths

4

Optical

Channel

Setup

5

FFFFFFFFFFFFFFFFFFFFFFFFFF

Calibrate

FFFFFFFFFFFFFFFFFFFFF

O/E

Cal

Plug-in

V

ertical

Calibration

V

ertical

oset

and

vertical

scale

accurac

y

for

both

electrical

and

optical

channels.

Channels

aected:

optical

&

electrical.

An

y

optical

or

electrical

vertical

measurements

such

as

V

p

to

p

,

e

ye

height,

extinction

ratio

,

and

the

optical

power

meter

P

erform

after

an

y

power

c

ycle

or

once

every

10

hours

during

continuous

use

or

if

operating

temperature

changes

b

y

more

than

2

C

.

4

Utility

5

FFFFFFFFFFFFFFFFFFFFFFFFFF

Calibrate

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

Calibrate

Plug-in

Oset

Zero

Calibration

V

ertical

oset

is

calibrated

for

the

optical

channel

only

.

This

calibration

doesn't

include

vertical

scale

accurac

y

.

Channels

aected:

optical.

An

y

optical

vertical

measurements

including:

V

p

to

p

,

e

ye

height,

and

extinction

ratio

.

P

erform

a

plug-in

vertical

calibration

in

order

to

meet

published

specications.

Because

the

oset

zero

calibration

performs

only

the

oset

portion

of

the

plug-in

vertical

calibration,

it

should

only

be

used

before

fast

non-critical

measurements.

4

Optical

Channel

Setup

5

FFFFFFFFFFFFFFFFFFFFFFFFFF

Calibrate

FFFFFFFFFFFFFFFFFFFFFFFF

Offset

0

Dark

Calibration

Dark

calibration

measures

the

channel

oset

signal

without

an

y

light

present

and

this

value

is

used

in

the

extinction

ratio

algorithm.

Channels

aected:

optical

&

electrical.

Extinction

ratio

.

Before

extinction

ratio

measurements

if

the

vertical

scale

or

oset

has

changed

since

the

last

dark

calibration

or

after

a

plug-in

vertical

calibration

is

performed.

4

Shift

5 ,

4

Meas

eye

5

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

Extinction

ratio

FFFFFFFFFFFFFFFFFFFFFFFF

Dark

Cal

3-8

Summary of Contents for 83481A

Page 1: ...User s Guide HP 83481A Optical Electrical Plug In Module ...

Page 2: ... in connection with the furnishing performance or use of this material Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and subparagraphs c 1 and c 2 of the Commercial Computer Software Restricted Rights claus...

Page 3: ... from the factory Hewlett Packard further certi es that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members iii ...

Page 4: ... instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the instrument or software or rmware will be uninterrupted or error free Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unau...

Page 5: ...ood CO 80112 303 649 5000 Georgia Hewlett Packard Company 2000 South Park Place Atlanta GA 30339 404 955 1500 Illinois Hewlett Packard Company 5201 Tollview Drive Rolling Meadows IL 60008 708 342 2000 New Jersey Hewlett Packard Company 150 Green Pond Road Rockaway NJ 07866 201 586 5400 Texas Hewlett Packard Company 930 East Campbell Road Richardson TX 75081 214 231 6101 EUROPEAN FIELD OPERATIONS H...

Page 6: ...00 South Service Road Trans Canada Highway Kirkland Quebec H9J 2X8 Canada 514 697 4232 China China Hewlett Packard Company 38 Bei San Huan X1 Road Shuang Yu Shu Hai Dian District Beijing China 86 1 256 6888 Japan Yokogawa Hewlett Packard Ltd 1 27 15 Yabe Sagamihara Kanagawa 229 Japan 81 427 59 1311 Singapore Hewlett Packard Singapore Ltd Pte Ltd Alexandra P O Box 87 singapore 9115 65 271 9444 Taiw...

Page 7: ...the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met WAR NING The warning sign denotes a life threatening hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met Instruction...

Page 8: ...G If this instrument is not used as speci ed the protection provided by the equipment could be impaired This instrument must be used in a normal condition in which all means for protection are intact only CA UTION Before this instrument is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source Failure to set the ac power input to the correct voltag...

Page 9: ...s 1 17 Cleaning lightwave adapters 1 18 Cleaning lensed connections 1 18 Storage 1 19 Making connections 1 20 Summary 1 21 Inspection 1 21 Optical performance testing 1 22 2 Channel Setup Menu Displaying the Channel Setup Menus 2 5 NNNNNNNNNNNNNNNNNNNNNNN Display 2 5 NNNNNNNNNNNNNNNNN Scale 2 6 NNNNNNNNNNNNNNNNNNNN Offset 2 7 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN...

Page 10: ...nel Skew Calibration 3 15 Probe Calibration 3 16 External Scale 3 18 Complete Calibration Summary 3 20 4 Speci cations and Characteristics Speci cations 4 3 Vertical speci cations 4 4 Environmental speci cations 4 8 Power requirements 4 8 Weight 4 8 Characteristics 4 9 Trigger input characteristics 4 9 Declaration of Conformity 4 10 5 In Case of Di culty If You Have Problems 5 3 If the mainframe d...

Page 11: ... 1 Current Frame 1Temp condition 3 5 3 2 Plug in calibration menu 3 10 3 3 O set Zero Calibration 3 13 3 4 Dark calibration menu 3 15 3 5 Electrical Channel Calibrate Menu 3 17 3 6 External Scale Menu 3 19 Tables 3 1 Factory Calibration Summary 3 4 3 2 Optical and Electrical Channel User Calibration Summary 3 8 3 3 Miscellaneous User Calibration Summary 3 9 3 4 Complete Calibration Summary 3 20 Co...

Page 12: ...Contents ...

Page 13: ...1 The Instrument at a Glance ...

Page 14: ...instrument is properly earth grounded to prevent buildup of static charge The HP 83481A optical electrical plug in module incorporates two measurement channels one optical and one electrical The electrical channel has two selectable bandwidth settings In the lower bandwidth modes of 12 4 GHz oscilloscope noise performance is excellent while the 20 GHz mode allows greater delity for high speed sign...

Page 15: ...ry repeatable HP microwave switch The switch removes the potential variability and the time wasted by manually inserting and removing the lter when alternating between high delity waveform characterization and SONET SDH compliance testing The electrical measurement channel may be used to perform measurements on tributary electrical signals to evaluate receiver performance in transceiver testing fo...

Page 16: ...th order lter response 155 Mb s and 622 Mb s Option 050 Fifth order lter response 155 Mb s and 622 Mb s Option 052 Two 2 155 Mb s lters one fourth order one fth order Option 062 Two 2 622 Mb s lters one fourth order one fth order Optionalaccessories HP 54006A 6 GHz divider probe HP 54008A 22 ns delay line HP 54118A 500 MHz to 18 GHz trigger HP 10086A ECL terminator Connectiondevices SMA f f adapte...

Page 17: ...ress the blue front panel Shift key and the front panel key next to the desired function Throughout this manual front panel keys are indicated by a box around the key label for example 4Timebase5 Softkeys are indicated by shading on the key label for example NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Mask Align The softkeys displayed depend on the front panel key pressed and which menu is selected Shifted f...

Page 18: ... highlighted A choices softkey will be indicated throughout this manual as NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Sweep Triggered Freerun Triggered When some softkeys such as NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate probe are pressed the rst time a measurement will be made and the result will be provided Some softkeys such as NNNNNNNNNNNNNNNNNNNN O...

Page 19: ...measurement channel has user selectable bandwidths of 12 4 or 20 GHz Optical channel has 2 85 GHz un ltered bandwidth 3 5 mm m connectors on electrical measurement channel and trigger channel One probe power connector One auxiliary power connector Optical channel has an HP universal adapter for 9 125 m single mode ber input NOTE If you wish to use the HP 83481A optical plug in module in an HP 5475...

Page 20: ...or the mainframe The plug in module scales the input signal sets the bandwidth of the system and allows the o set to be adjusted so the signal can be viewed The output of the plug in module is an analog signal that is applied to the ADCs on the acquisition boards inside the mainframe The plug in module also provides a trigger signal input to the time base trigger board inside the mainframe 1 8 ...

Page 21: ...r input The front panel also has two Probe Power connectors for HP 54700 series probes an Aux Power connector for general purpose use and a key for each channel that displays the softkey menu The softkey menu allows you to access the channel setup features of the plug in module The front panel Probe Power connectors allow automatic channel scaling and probe calibration with HP 54700 series probes ...

Page 22: ...The Instrument at a Glance TheHP83481AOptical Electrical Plug InModule Figure1 2 Blockdiagramofthe plug inmodule 1 10 ...

Page 23: ...or information on ordering the latest version of the operating system rmware refer to Ordering information earlier in this chapter Follow the procedure for upgrading the rmware described in the HP 83480A 54750A User s Guide If your system includes an HP 83483A 83484A 54753A or 54754A follow the procedure for re initializing the modules described in the HP 83480A 54750A Service Guide It is not nece...

Page 24: ... RF connectors on the rear of the plug in module are spring loaded so nger tighten the knurled screw on the front panel of the plug in module to make sure the plug in is securely seated in the mainframe CA UTION Do not use extender cables to operate the plug in module outside of the mainframe The plug in module using extender cables can be damaged by improper grounding when using extender cables T...

Page 25: ...static discharges to the front panel input connectors Before connecting any coaxial cable to the connectors momentarily short the center and outer conductors of the cable together Avoid touching the front panel input connectors without rst touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge 1 13 ...

Page 26: ...and the system However regardless of the cable type the connectors have only one function to provide a direct and low loss optical signal transition from one ber end to another When these connectors are used in a measurement system repeatability becomes an important factor Lightwave connectors di er from electrical or microwave system connectors In a ber optic system light is transmitted through a...

Page 27: ... spacing and air gaps re ections caused by damaged worn or loose ber ends and the improper use and removal of index matching compounds Achieving the best possible connection where the ber end faces are ush no air gap and properly aligned depends on two things 1 The type of connector 2 Using the proper cleaning and connecting techniques If the connection is lossy or re ective light will not make a ...

Page 28: ...to mate two optical connectors Handling Always handle lightwave connectors and cable ends with great care Fiber ends should never be allowed to touch anything except other mating surfaces or cleaning solutions and tools Always keep connectors and cable ends covered with a protective cap when they are not in use See Storage Cleaning Three cleaning processes are provided The rst process describes ho...

Page 29: ...lean the ber end Some amount of wiping or mild scrubbing of the ber end can help remove particles when application of alcohol alone will not remove them This can be done by applying the alcohol to a cotton swab and moving it back and forth across the ber end several times This technique can help remove or displace particles smaller than one micron Allow the connector to dry about a minute or dry i...

Page 30: ...t from cleaning the inside of adapters Process Clean the adapter by applying isopropyl alcohol to the inside of the connector with a foam swab Allow the adapter to air dry or dry it immediately with clean compressed air Cleaning lensed connections Some instruments may have a connector that is lensed In other words the connection does not provide a physically contacting connection but the light is ...

Page 31: ...nnectors on the instrument If you remove these adapters you should keep the exposed connector of your instrument covered until the next use Protective covers for these exposed connectors are not provided with the instruments so it is best to keep the adapters on the instrument with the dust covers on The list below provides the HP part numbers for the laser shutter cap and dust caps that are provi...

Page 32: ...s data sheet to con rm connector type compatibility before connecting When you insert the ferrule into a connector or adapter make sure that the ber end does not touch the outside of the mating connector or adapter In this way you will not rub the ber end against any undesirable surface Many connectors have a keyed slot provided for optimum measurement repeatability that also helps to align and se...

Page 33: ...ds can be helpful Contamination and or imperfections on the cable endface can be detected as well as cracks or chips in the ber itself Several ber inspection scopes are on the market but any microscope with an enlargement range of 1002 to 2002 can be used It is helpful to devise some method to hold the ber in place while viewing in this range Inspect the entire endface for contamination raised met...

Page 34: ...nsertionloss Insertion loss can be tested using a number of di erent test equipment con gurations Some of these are an HP 8153A lightwave multimeter with a source and a power sensor module an HP 8702B or HP 8703A lightwave component analyzer system with a lightwave source and receiver Many other possibilities exist The basic requirements are an appropriate lightwave source and a compatible lightwa...

Page 35: ...3A lightwave component analyzer an HP 8504A precision re ectometer Many other possibilities exist The basic requirements are an appropriate lightwave source a compatible lightwave receiver and a compatible lightwave coupler Refer to the manuals provided with your lightwave test equipment for information on how to perform a return loss test Typical return loss is better than 20 to 30 dB and can be ...

Page 36: ...TheInstrumentata Glance ...

Page 37: ...2 Channel Setup Menu ...

Page 38: ...ent is properly earth grounded to prevent buildup of static charge At the top of the plug in module are the 4Channel5 keys These keys give you access to the Channel Setup menu for each input The Channel Setup menu is displayed on the right side of the screen when the 4Channel5 key is pressed There are several types of softkeys available A description of the di erent softkeys and their functions is...

Page 39: ...ChannelSetupMenu Figure 2 1 OpticalChannelSetup menu 2 3 ...

Page 40: ...ChannelSetupMenu Figure2 2 ElectricalChannel Setupmenu 2 4 ...

Page 41: ...ain on the display until the channel is turned o or an automatic measurement is performed The automatic measurement results share the same area of the display as the channel setups When the channel display is o the waveform display for that channel is turned o pulse parameter measurements are stopped and acquisition on that channel is stopped unless it is needed as an operand for waveform math fun...

Page 42: ...on the knob and arrow keys change the vertical scaling in 1 mW increments mV if using the electrical channel You can also use the keypad to enter values in 1 mW or 1 mV increments independent of the ne mode selection The units the scale is displayed in depend on the unit of measure selected with the Units softkey The choices for units are volts or watts Amperes or unknown are available on electric...

Page 43: ...gative power levels do not exist but the zero power level can be viewed clearly when the o set is set to zero watts You can use the knob arrow keys or keypad to change the o set setting The ne mode also works with o set When an HP 54700 series active probe is used with the plug in module and is connected to the probe power connector adjacent to the channel input the o set control adjusts the exter...

Page 44: ... allows a SONET SDH Bessel Thomson lter to be switched into the channel to create a SONET SDH reference receiver The choices are 155 Mb s or 622 Mb s The values of the lters depend on the installed options KeyPath 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Bandwidth Wavelength NNNNNNNNNNNNNNNNNNNN Filter NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN 155 Mb s 4...

Page 45: ...NNNNNNNNNNNNNNN Channel autoscale aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa External scale The External Scale function allows you to setup the analyzer to use external optical to electrical converters or attenuators Scaling is automatically adjusted to account for the external device KeyPath 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN...

Page 46: ...with the knob arrow keys or keypad NOT E Refer to Chapter 3 for information on calibrating to the tip of the probe KeyPath 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN External scale NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Attenuation NNNNNNNNNNNNNNNNN Units The Units function lets you select the unit of measure appended to the channel scale o set trigger level and vertical...

Page 47: ... or NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Ext Offset 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN External scale NNNNNNNNNNNNNNNNN Units NNNNNNNNNNNNNNNNNNNN Ampere NNNNNNNNNNNNNNNNNNNNNNNNNN Ext gain or NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Ext Offset 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN External scale NNNNNNNNNNNNNNNNN Units NNNNNNNNNNNNNN Wa...

Page 48: ...s Another use for skew is when you are comparing two waveforms that have a timing di erence between them If you are more interested in comparing the shapes of two waveforms rather than the actual timing di erence between them you can use Skew to overlay one waveform on top of the other waveform To skewtwochannels 1 Turn both channels on and overlay the signals vertically 2 Expand the time base so ...

Page 49: ...t Date This is the current date and time You can compare this to the last plug in module calibration time That way you will know how long it has been since the last plug in module calibration was performed Current Frame 1Temp This is the temperature change on the inside of the instrument since the last mainframe calibration was performed A positive number indicates how many degrees warmer the main...

Page 50: ...dc accuracy NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Offset zero The O set Zero function performs a quick o set calibration on the optical channel Since the primary source of calibration error on the optical channel is o set drift this function is useful between the plug in module vertical calibrations if the plug in module has not been removed or reinstalled and the operating temperature has not chang...

Page 51: ...The analyzer calibrates to the tip of the probe by setting the probe attenuation to the actual attenuation ratio of the probe The analyzer also automatically compensates for any o set the probe may introduce The CAL signal is internally routed to the probe tip for HP probes KeyPath 4Channel5 NNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate probe 2 1...

Page 52: ...ChannelSetupMenu ...

Page 53: ...3 Calibration Overview ...

Page 54: ...shed speci cations This chapter is divided into three sections The rst section describes factory calibrations A factory calibration consists of verifying instrument performance to all speci cations If an instrument fails to meet speci cations adjustment or repair may be necessary For most users this will mean shipping the instrument back to an authorized service center Some users may purchase the ...

Page 55: ...erformed on a periodic basis HP designs instruments to meet speci cations over the recommended calibration interval provided that the instrument is operated within the speci ed operating environment To maintain speci cations periodic recalibrations are necessary We recommend that the plug in module be calibrated at an HP service facility every 12 months Users are encouraged to adjust the calibrati...

Page 56: ...calibration temperature See service manual 4Utility5 FFFFFFFFFFFFFFFFFFFFFFFFFF Calibrate FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF Calibrate frame O E Factory Wavelength Calibration The photodetector responsivity Channels a ected optical Amplitude accuracy of all optical channel measurements Optical power meter accuracy Annual factory re calibration of standard wavelengths Not user accessible 1...

Page 57: ... this switch CAU TION Do not attempt a Mainframe calibration without consulting the HP 83480A 54750A Service Guide A mainframe calibration should be performed on a periodic basis annually or when the ambient operating temperature has changed by and remains 5 C di erent than the operating temperature at which the last mainframe calibration was performed To see how much the operating temperature has...

Page 58: ... optical channel measurements is dependent on proper O E calibration O E calibrations should be performed annually Most customers return their optical plug ins to an authorized HP service center for this calibration at the same time they are having their mainframes re calibrated The HP 83480 series optical modules have one or two standard wavelengths 850 nm or 1310 1550 nm The O E Calibration func...

Page 59: ...r adjusting timebase skew monitoring and adjusting internal o sets performing a user de ned O E responsivity adjustment CAU TION The input circuits can be damaged by electrostatic discharge ESD Avoid applying static discharges to the front panel input connectors Before connecting a coaxial cable to the connectors momentarily short the center and outer connectors of the cable together Avoid touchin...

Page 60: ...FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF Calibrate Plug in O set Zero Calibration Vertical o set is calibrated for the optical channel only This calibration doesn t include vertical scale accuracy Channels a ected optical Any optical vertical measurements including Vp to p eye height and extinction ratio Perform a plug in vertical calibration in order to meet published speci cations Because...

Page 61: ... Calibrate FFFFFFFFFFFFF Skew External Scale Compensates for gain or loss associated with external devices calibrates vertical scale to external device Channels a ected optical electrical Any measurement taken through an external device component or transducer Whenever using external devices component or transducer 4Channel Setup5 FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF External Scale O E User...

Page 62: ...wer meter such as the HP 8153A and use precision optical connectors In addition proper connector cleaning procedures are essential to obtaining an accurate calibration To performanO E user wavelength calibration 1 Press the plug in module s front panel optical channel 4SETUP5 key 2 Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate and then 4O E cal5 3 Input the correct wavelength and follow the instru...

Page 63: ...rtical calibration establishes vertical accuracy A plug in vertical calibration should be done if The mainframe has cycled power The plug in has been repaired reprogrammed or removed from the mainframe The instrument s operating temperature has changed and remains more than 5 C from the temperature at which the Plug in calibration was performed To obtain the best measurement results it is recommen...

Page 64: ... calibrator output to the electrical channel during an optical vertical calibration then the factory O E calibration has been lost The module must then be returned to HP for calibration O set Zero Calibration The o set zero calibration performs a quick o set calibration on the optical channel for optical measurements Since the primary source of calibration error on the optical channel is o set dri...

Page 65: ... Disconnect all inputs from the module being calibrated 2 Cover all optical inputs 3 Press the plug in module s front panel optical channel 4SETUP5 key 4 Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate and then NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Offset zero Figure 3 3 O setZeroCalibration 3 13 ...

Page 66: ...cal calibration as needed This increases the time required for the dark calibration to complete The NNNNNNNNNNNNNNNNNNNNNNNNNN Dark cal softkey is located within the Extinction ratio menu To initiateadark calibration 1 Press the 4Display5 key Press the NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Color grade softkey and set its setting to NNNNNNNN on Color grade must be enabled to perform an extinction rat...

Page 67: ...ly 100 s You can use skew to compensate for the di erences in cable or probe lengths It also allows you to place the trigger edge at the center of the display when you are using a power splitter connected between the channel and trigger inputs Another use for skew is when you are comparing two waveforms that have a timing di erence If you are interested in comparing the shapes of two waveforms rat...

Page 68: ... the instrument adjusts the vertical scale factors only if a probe calibration is performed Probe calibration allows the instrument to establish the gain and o set of speci c probes that are connected to a channel of the instrument and then apply those factors to the calibration of that channel The analyzer calibrates to the tip of the probe by setting the probe attenuation to the actual attenuati...

Page 69: ...NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate Probe Tocalibrate a non identi ableprobe 1 Connect the voltage probe to the plug in 2 Attach the probe tip to the CAL hook that is located near the oppy disk drive 3 Press the plug in module s front panel channel 4SETUP5 key 4 Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate and then NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Calibrate probe If the prob...

Page 70: ...en NNNNNNNNNNNNNNNNN Units Ampere Volt Watt or Unknown 4 Press NNNNNNNNNNNNNNNNNNNNNNNNNN Ext gain and enter the actual gain characteristics of the probe or device 5 Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Ext offset and enter the o set introduced by the probe or device External Scale Both optical and electrical channels have an External scale setting which allows the user to enter in an o set valu...

Page 71: ...Calibration Overview UserCalibrations OpticalandElectrical Figure3 6 ExternalScale Menu 3 19 ...

Page 72: ...Annual factory re calibration of standard wavelengths Not user accessible 1 O E User Wavelength Calibration The photodetector responsivity Channels a ected optical All optical channel measurements at user wavelengths Annual re calibration of user de ned non factory wavelengths 4Optical Channel Setup5 FFFFFFFFFFFFFFFFFFFFFFFFFF Calibrate FFFFFFFFFFFFFFFFFFFFF O E Cal Plug in Vertical Calibration Ve...

Page 73: ...ed since the last dark calibration or after a plug in vertical calibration is performed 4Shift5 4Meas eye5 FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF Extinction ratio FFFFFFFFFFFFFFFFFFFFFFFF Dark Cal Probe calibration Probe Attenuation Channels a ected electrical Any electrical measurement taken with the probe Whenever a probe is connected 4Electrical Channel Setup5 FFFFFFFFFFFFFFFFFFFFFFFFFF...

Page 74: ...CalibrationOverview ...

Page 75: ...4 Speci cations and Characteristics ...

Page 76: ...otherwise noted corrected limits are given when speci cations are subject to minimization with error correction routines Characteristics Characteristics provide useful nonwarranted information about the functions and performance of the instrument Characteristics are printed in italics Calibrationcycle HP designs instruments to meet speci cations over the recommended calibration interval provided t...

Page 77: ...ns The following are speci cations used to test the HP 83481A plug in module Speci cations are valid after a 1 hour warm up period See the HP 54701A Active Probe Service Guide for complete probe speci cations 4 3 ...

Page 78: ...ition Time 10 90 calculated from T 0 35 BW typical 12 4 GHz 28 2 ps 20 GHz 17 5 ps Maximum Noise RMS 12 4 GHz 0 5 mV 0 25 mV typical 20 GHz 1 mV 0 5 mV typical Scale Factor full scale is eight divisions Minimum 1 mV div Maximum 100 mV div dc O set Range 6500 mV 1 It is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the temperature has changed...

Page 79: ...haracteristics Speci cations Electrical Channel Nominal Impedance 50 Connector 3 5mm m Re ections 5 for 30 ps rise time Dynamic Range 6400 mV relative to channel o set Maximum Safe Input Voltage 16 dBm peak ac 62V dc 4 5 ...

Page 80: ...v dc O set Range 0 2 mW to 00 6 mW referenced to two divisions above bottom of screen Connector Type 9 125 m single mode user selectable connector option Input Return Loss 33 dB HMS 10 HP connector 1 Exceeding the speci ed input power level will cause waveform distortion 2 Referenced to average power monitor 3 It is recommended that a user vertical calibration be performed after every 10 hours of ...

Page 81: ...ating range 030 dBm to 04 dBm 1 W to 400 W Factory calibrated accuracy 20 C to 30 C 65 of reading 6100 nW 6 connector uncertainty User calibrated accuracy1 5 C temp change 62 of reading 6100 nW 6 power meter uncertainty Maximum Safe Input 10 mW peak Wavelength Range 1000 1600 nm 1 A user calibration can be performed with average optical power levels from 100 to 400 W however the instrument optical...

Page 82: ...perature Operating 15 C to 35 C Non operating 040 C to 70 C Humidity Operating up to 90 relative humidity non condensing at 35 C Non operating up to 95 relative humidity non condensing at 65 C Power requirements Supplied by mainframe Weight Net approximately 1 2 kg 2 6 lb Shipping approximately 2 1 kg 4 6 lb 4 8 ...

Page 83: ...ervice Guide for complete probe characteristics Trigger input characteristics Electrical and Optical Channels Nominal Impedance 50 Input Connector 3 5 mm m Trigger Level Range 61 V Maximum Safe Input Voltage 62 Vdc ac peak 16 dBm Percent Re ection 10 for 100 ps rise time Refer to the HP 83480A 54750A User s Guide for trigger speci cations 4 9 ...

Page 84: ...Declaration of Conformity 4 10 ...

Page 85: ...5 In Case of Di culty ...

Page 86: ...pter This chapter provides a list of suggestions for you to follow if the plug in module fails to operate A list of messages that may be display is also included For complete service information refer to the optional HP 83481A Service Guide 5 2 ...

Page 87: ...nframe does not operate Please make the following checks 1 Is the line fuse good 2 Does the line socket have power 3 Is the unit plugged in to the proper ac power source 4 Is the mainframe turned on 5 Is the rear panel line switch set to on 6 Will the mainframe power up without the plug in module installed If the mainframe still does not power up refer to the optional HP 83480A 54750A Service Guid...

Page 88: ... more information about cleaning the connectors 2 Perform the following procedures Make sure the instrument is ready to acquire data by pressing NNNNNNNNNNN Run Find any signals on the channel inputs by pressing 4Autoscale5 See if any signals are present at the channel inputs by pressing 4Trigger5 NNNNNNNNNNNNNNNNN Sweep NNNNNNNNNNNNNNNNNNNNNNN freerun After viewing the signal press NNNNNNNNNNNNNN...

Page 89: ...ainframe has identi ed the plug in If known is displayed instead of the model number of the plug in module remove and reinsert the plug in module in the same slot If known is still displayed then the memory contents of the plug in module are corrupt Refer to the optional HP 83481A Service Guide or contact a quali ed service department If all of the above steps check out okay and the plug in module...

Page 90: ...alling plug in The mainframe could not correctly read the contents of the memory in the plug in 1 Remove and reinstall the plug in module Each time a plug in is installed the mainframe rereads the plug in module s memory 2 Verify the plug in module is rmly seated in the mainframe slot 3 Verify the knurled screws at the bottom of the plug in module are nger tight 4 Install the plug in in a di erent...

Page 91: ... caused by a communication problem between the mainframe and the plug in module Make sure there is a good connection between the mainframe and the plug in 1 Remove and reinstall the plug in module 2 Verify the plug in module is rmly seated in the mainframe slot 3 Verify the knurled screws at the bottom of the plug in module are nger tight 4 The HP 54750A mainframe does not accept the HP 83481A opt...

Page 92: ...InCaseofDi culty ...

Page 93: ...Index ...

Page 94: ...Bandwidth Wavelength softkey 2 8 Bessel Thomson lter 1 2 2 8 C Calibrate probe softkey 2 15 Calibrate softkey 2 11 calibration external scale 3 15 factory 3 4 mainframe 3 4 O E 2 14 3 6 O E converters 3 15 O E user wavelength 3 9 o set zero 2 14 3 12 overview 3 2 plug in module vertical calibration 3 11 probe 3 16 probes 3 15 skew 3 15 status 5 5 user 3 7 validity 2 14 vertical 1 11 voltage probe ...

Page 95: ...nt Frame 1Temp message 2 13 customer assistance v D decibel calculation 2 9 declaration of conformity 4 10 description of the plug in module 1 2 digital o set 2 7 Display softkey 2 5 E electrical channel 1 2 environmental speci cations 4 8 power requirements 4 8 trigger input characteristics 4 9 vertical speci cations 4 4 weight 4 8 environmental speci cations 4 8 error messages 5 6 7 extender cab...

Page 96: ...bration 3 4 mainframe troubleshooting 5 3 making connections 1 20 marker value 2 10 math function 2 5 menu overview 1 5 N non lensed connector care 1 17 O O E calibration 3 6 O E cal softkey 2 14 O E converter calibration 3 15 O E user wavelength calibration 3 9 o set 2 5 7 2 10 2 14 O set softkey 2 7 o set zero calibration 3 12 O set zero softkey 2 14 optical ber interface 1 20 performance testin...

Page 97: ... plug in module vertical calibration 3 11 power level 2 7 power requirements 4 8 probe attenuation 2 10 2 15 attenuation factor 2 9 characteristics 2 11 power 2 7 power connector 1 9 probe calibration 3 15 3 16 pulse parameter measurements 2 5 R return loss 1 23 RF connectors 1 11 S safety information vii 8 1 12 Scale softkey 2 6 shifted function keys 1 5 skew calibration 3 15 Skew softkey 2 12 so...

Page 98: ...tkey 2 6 2 10 user calibrations 3 7 V vertical calibration 1 11 measurement 2 10 scale 2 5 6 2 9 speci cations 4 4 waveform 2 7 visual inspection of ber ends 1 21 voltage measurement 2 10 probe 2 15 voltage probe calibration 3 16 W warranty information iv wattage measurement 2 10 waveform display 2 5 horizontal 2 12 Wavelength key 2 8 wavelength settings 2 8 weight of plug in module 4 8 Index 6 ...

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