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Measurements Applications

Measuring Signal-to-Noise Ratios with Averaging

Measuring Signal-to-Noise Ratios with Averaging

When the lasers being measured are modulated, especially with repetitive data for-
mats such as SONET or PRBS, the noise floor is raised. Averaging reduces the noise
floor and allows an improvement of greater than 10 dB in a signal-to-noise measure-
ment. In general, averaging will decrease the noise floor caused by modulation until
the true optical noise level is reached. The displayed signal-to-noise will improve
with each average until the true optical noise level is reached, and then the displayed
signal-to-noise will remain approximately constant. If, however, the true signal-to-
noise is below the instrument sensitivity of approximately 40 dB (in a 0.1 nm noise
bandwidth), it will not be measured.
Averaging can also improve the accuracy of measuring signal-to-noise of unmodu-
lated lasers.

Signal-to-noise with averaging display.

Averaging is performed on the noise, not on the wavelength or power of the laser
signals.
The signal-to-noise with averaging measurement uses the automatic interpolation
method to determine the wavelengths where the noise is measured.

Refer to “Mea-

suring Signal-to-Noise Ratios” on page 69

for a description of automatic interpola-

tion. There is no user-entered wavelength selection in signal-to-noise with
averaging.
During a signal-to-noise with averaging measurement, the display indicates

S/N A

xx,

where A indicates averaging and xx is the number of averages taken so far.

The maximum number of averages is 900, the minimum number of averages is 10,
and the default (Preset) value is 100 averages. A measurement with 100 averages
takes about 2 minutes to complete. When the measurement is complete, the instru-
ment switches to single measurement mode. Then, pressing the Cont key will start a

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Содержание 86120B

Страница 1: ...Keysight 86120B Multi Wavelength Meter User s Guide...

Страница 2: ......

Страница 3: ...1...

Страница 4: ...r legal theory Assistance Product maintenance agree ments and other customer assis tance agreements are available for Keysight Technologies prod ucts For any assistance contact your nearest Keysight T...

Страница 5: ...instruments with firmware version number 2 0 When first turned on the instrument briefly displays the firmware ver sion These instruments have the added capability of measuring broadband devices and...

Страница 6: ...ctor Program the instrument for automatic measurements The Keysight 86120B offers an extensive set of GPIB programming commands These commands allow you to perform automated measurements on manufactur...

Страница 7: ...s and accessories The Keysight 86120B s front panel INPUT connector is no exception When you use improper cleaning and handling techniques you risk expensive instrument repairs damaged cables and comp...

Страница 8: ...h must be followed by the user to ensure safe operation and to maintain the product in a safe condition There is no output laser aperture The Keysight 86120B does not have an output laser aperture How...

Страница 9: ...5 1 2007 Class 1 Max permissible CW output power 0 39 mW 1 Max CW output power is defined as the highest possible optical power that the laser source can produce at its output connector Laser Safety I...

Страница 10: ...y dampened with water to clean the external case parts Do not attempt to clean internally WARN IN G This is a Safety Class 1 product provided with protective earth The mains plug shall only be inserte...

Страница 11: ...ipated in the cabinet is greater than 800 watts then forced convection must be used C A U T I O N Always use the three prong ac power cord supplied with this instrument Failure to ensure adequate eart...

Страница 12: ...10 General Safety Considerations...

Страница 13: ...ulti Wavelength Meter Displaying Wavelength and Power 39 Changing the Units and Measurement Rate 49 Defining Laser Line Peaks 52 Measuring Laser Separation 56 Measuring Modulated Lasers 60 Measuring T...

Страница 14: ...T Subsystem 218 6 Performance Tests Test 1 Absolute Wavelength Accuracy 221 Test 2 Sensitivity 222 Test 3 Polarization Dependence 223 Test 4 Optical Input Return Loss 224 Test 5 Amplitude Accuracy and...

Страница 15: ...onnect a Printer 17 Step 4 Turn on the Keysight 86120B 18 Step 5 Enter Your Elevation 20 Step 6 Select Medium for Wavelength Values 21 Step 7 Turn Off Wavelength Limiting 22 Cleaning Connections for A...

Страница 16: ...hat the ON OFF switch is readily identifiable and is easily reached by the operator The ON OFF switch or the detachable power cord is the instrument disconnecting device It disconnects the mains circu...

Страница 17: ...ials and notify both the shipping carrier and the nearest Keysight Technologies sales and service office Keysight Technologies will arrange for repair or replacement of damaged or incomplete shipments...

Страница 18: ...this instrument Failure to ensure adequate earth grounding by not using this cord may cause instrument damage C A U T I O N Do not connect ac power until you have verified the line voltage is correct...

Страница 19: ...right angle connector so that the Keysight 86120B can be used while sitting on its rear feet You can order additional ac power cables for use in different geographic areas Refer to Connector interface...

Страница 20: ...isplay should look similar to the following figure The front panel LINE switch disconnects the mains circuits from the mains supply after the EMC filters and before other parts of the instrument 2 If...

Страница 21: ...f the front panel OPTICAL INPUT connector Operator maintenance or precautions are not necessary to maintain safety No controls adjustments or performance of procedures result in hazardous radia tion e...

Страница 22: ...ss the Setup key 2 Press the MORE softkey 3 Press the CAL softkey 4 Press ELEV 5 Use the and softkeys to enter the elevation in meters Entries jump in 500 meter steps from 0 m to 5000 m The elevation...

Страница 23: ...two mediums vacuum and standard air 1 Press the Setup key 2 Press the MORE softkey 3 Press the CAL softkey 4 Make the following selection Press VACUUM for wavelength readings in a vacuum Press STD AIR...

Страница 24: ...limited to measuring lasers between 1200 nm and 1650 nm You can easily expand the input range to the full 700 nm to 1650 nm range with the following steps 1 Press the Preset key 2 Press the Setup key...

Страница 25: ...e mechanical assembly that holds the ferrule in position against another identical ferrule Connectors also vary in the polish curve and concentricity of the core within the cladding Mating one style o...

Страница 26: ...a good compromise between performance reliability and cost If prop erly maintained and cleaned this connector can withstand many repeated connec tions However many instrument specifications require t...

Страница 27: ...ickel silver to fix the fiber in a near center location then uses a post active staking to shift the fiber into the desired position within 0 2 m This process plus the keyed axis allows very precise c...

Страница 28: ...is recommended Figure 1 4 shows the end of a clean fiber optic cable The dark circle in the center of the micrograph is the fiber s 125 m core and cladding which carries the light The surrounding are...

Страница 29: ...e the best possible performance when making measurements on a fiber optic system Never use metal or sharp objects to clean a connector and never scrape the connector Avoid matching gel and oils Figure...

Страница 30: ...at an angle can scrape material off the inside of the connector or even break the inside sleeve of connectors made with ceramic material When inserting a fiber optic connector into a connector make su...

Страница 31: ...good return loss mea surement The quality of the polish establishes the difference between the PC physical contact and the Super PC connectors Most connectors today are physi cal contact which make g...

Страница 32: ...ecting the fiber ends Disable all optical sources before disconnecting fiber optic cables Failure to do so may result in permanent injury to your eyes Cleaning Connectors The procedures in this sectio...

Страница 33: ...osits on fiber ends that can degrade performance 1 Apply pure isopropyl alcohol to a clean lint free cotton swab or lens paper Table 1 2 Cleaning Accessories Item Keysight Technologies Part Number Pur...

Страница 34: ...gas or compressed dust remover can also be used C A U T I O N Do not shake tip or invert compressed air canisters because this releases particles in the can into the air Refer to instructions provide...

Страница 35: ...the inside of adapters greatly outweighs the risk of contamination by foam swabs 2 Clean the adapter with the foam swab 3 Dry the inside of the adapter with a clean dry foam swab 4 Blow through the a...

Страница 36: ...e terms of the warranty or contract the warranty is at the front of this manual If the instrument is no longer under war ranty or is not covered by a Keysight Technologies maintenance plan Keysight Te...

Страница 37: ...rst received the instrument C A U T I O N Cover electrical connectors to protect sensitive components from electrostatic damage Cover optical connectors to protect them from damage due to physical con...

Страница 38: ...protect the instrument and prevent it from moving in the carton If packing foam is not available the best alternative is S D 240 Air Cap from Sealed Air Corpo ration Commerce California 90001 Air Cap...

Страница 39: ...ts and Measurement Rate 49 Defining Laser Line Peaks 52 Measuring Laser Separation 56 Measuring Modulated Lasers 60 Measuring Total Power Greater than 10 dBm 62 Calibrating Measurements 63 Printing Me...

Страница 40: ...nm and 1200 nm on page 44 10 dBm maximum total displayed input power Laser linewidths assumed to be less than 10 GHz If you change the elevation where you will be using your Agilent 86120B refer to C...

Страница 41: ...elength List by wavelength or power Average wavelength and total power If the measured amplitudes are low clean the front panel OPTICAL INPUT connec tor This section includes Peak WL mode 40 List by W...

Страница 42: ...ition to the digital readouts there is a power bar It provides a convenient ana log meter movement for tuning laser power Although the Peak WL mode shows one signal at a time softkeys are provided tha...

Страница 43: ...of the following Press the green Preset key Press Peak WL 3 To move the cursor to view other signals press PREV WL to select next previous shorter wavelength NEXT WL to select next longer wavelength P...

Страница 44: ...e cursor displayed Annotation in the upper right corner of the display indicates whether the signals are ordered according to wavelength BY WL or power BY PWR The cursor shows the currently selected l...

Страница 45: ...he laser lines The following equation shows how individual wavelengths of laser lines are summed together to obtain the average wavelength value where n is the number of laser lines included in the av...

Страница 46: ...l line it is considered a peak Its displayed power level may be greater than that of the fundamental because the amplitude correction at 775 nm is much greater by about 15 dB than that at 1550 nm the...

Страница 47: ...range to the region of interest minimizes the number of spurious wavelengths displayed Also the graphical dis play uses these start and stop wavelength values to plot the power spectrum whether the wa...

Страница 48: ...of the integration limits Care must be taken to ensure that the integration limits are above any noise This is especially true when measur ing devices with sloping noise floors like an EDFA amplifier...

Страница 49: ...e Power Offset value In most cases the noise floor will be visible if the total input power is greater than about 5 dBm The Agilent 86120B graphical display The Peak Threshold value is displayed as a...

Страница 50: ...o noise is on when an instrument state is saved it is off when that state is recalled To save an instrument state 1 Press the Setup key 2 Press the SAV RCL softkey 3 Press the SAVE softkey 4 Press one...

Страница 51: ...ent rate This section includes Displayed units 49 Measurement rate 50 Continuous or single measurements 51 Displayed units As described below it s easy to change the wavelength and amplitude units You...

Страница 52: ...te mode that maximum accuracy and wavelength resolution are achieved However should a faster update be desired for example when real time feedback is required to tune a laser to its des ignated channe...

Страница 53: ...h between normal and fast update modes the rate that the asterisk blinks changes You can specify that the instrument perform a measurement only when the front panel Single key is pressed This is the s...

Страница 54: ...o 40 dB The peak threshold s default value is 10 dB This ensures that any modulated signals being measured are not confused with their AM sidebands For unmodulated lasers or Fabry Perot lasers it may...

Страница 55: ...are identified as one laser line the minimum point between 4 and 5 does not drop to the peak excursion limit This response has the highest power shown which is peak 4 Whenever the peak threshold limit...

Страница 56: ...lent 86120B s specified sensi tivity may be accompanied by second harmonic or other distortion For example a low power laser line at 1550 nm has a second harmonic line at 775 nm If this second harmoni...

Страница 57: ...k wavelength is identified The default value is 10 dB Pressing the green PRESET key changes the peak excursion and peak threshold val ues to their default settings It also turns wavelength range limit...

Страница 58: ...ivision multiplexed WDM systems where channel spacing must be adhered to The Agilent 86120B can display the wavelength and amplitude of any laser line relative to another In fact the fol lowing types...

Страница 59: ...as the reference It is shown in absolute units The wavelengths and powers of the remaining responses are shown relative to this reference For example the first response is 2 596 nm below the referenc...

Страница 60: ...reference laser line 6 Press SELECT Press SELECT at any time to select a new reference Press RESET at any time to turn off the delta calculation Measuring flatness You can use relative power measureme...

Страница 61: ...List by Power This lists the input signals by power with the largest response listed first 3 Press the Delta On key 4 Select PWR 5 Use the and softkeys to select the first laser line 6 Press SELECT 7...

Страница 62: ...d Refer to Defining Laser Line Peaks on page 52 Even when the laser is amplitude modulated the correct wavelength and power is displayed The spurious wavelengths caused by low frequency amplitude modu...

Страница 63: ...peak excursion peak threshold and wavelength range limiting How ever increasing peak threshold can cause spurious wavelengths to be displayed To control the wavelength range refer to on page 44 Even...

Страница 64: ...e maximum total input power that can be applied to the Agilent 86120B before damage occurs is 18 dBm The maximum total input power that can be measured is 10 dBm 1 Connect an optical attenuator betwee...

Страница 65: ...6120B by entering the elevation Elevations from 0 to 5000 meters can be entered The elevation correction is immediately applied to the current measure ment even if the instrument is in the single meas...

Страница 66: ...ith the softkeys must be within 250 meters of the actual elevation 6 Press RETURN to complete the entry To select the medium for light 1 Press the Setup key 2 Press the MORE softkey 3 Press the CAL so...

Страница 67: ...up to 100 The measurement values printed depend on the set tings of the instrument when the Print key is pressed The following is an example of a typical printout Agilent 86120B SER US36151025 Firmwar...

Страница 68: ...You can use the ABORT and CONT softkey to stop and restart a print job that is in progress...

Страница 69: ...3 Measuring Signal to Noise Ratios 69 Measuring Signal to Noise Ratios with Averaging 73 Measuring Laser Drift 75 Measuring Coherence Length 78 Measurements Applications...

Страница 70: ...ts Applications Measurements Applications Measurements Applications In this chapter you ll learn how to make a variety of fast accurate measurements using the measurement tools accessed by pressing th...

Страница 71: ...ing figure has a signal to noise ratio of 30 0 dB Signal to noise display During a signal to noise measurement the absolute power of the carrier in dBm is compared to the absolute power of the noise a...

Страница 72: ...the two channels and an equal distance to the other side of the signal of interest See points Pn1 and Pn2 in the following fig ure If the closest signal is more than 200 GHz from the signal of intere...

Страница 73: ...measurements to a bandwidth of 0 1 nm The annotation 0 1 nm is displayed to show that the noise bandwidth is being normalized to a 0 1 nm bandwidth To measure signal to noise 1 Press the front panel P...

Страница 74: ...interpolate the wavelength or press USER to select the last wavelength manually entered b If you chose USER you can specify the wavelength by pressing USER WL Use the softkey to select the digit that...

Страница 75: ...ured Averaging can also improve the accuracy of measuring signal to noise of unmodu lated lasers Signal to noise with averaging display Averaging is performed on the noise not on the wavelength or pow...

Страница 76: ...0B must account for the noise bandwidth used during the measurement Because noise bandwidth varies with mea surement bandwidth a wide bandwidth allows more noise to the Keysight 86120B s detector than...

Страница 77: ...ance over time temperature or other condition The following display shows power and wavelength drift measured on five laser lines The DRIFT annotation item tells you that drift measurements are being...

Страница 78: ...a lesser value Note that the maximum wavelength and maximum power may not have occurred simultaneously Display shows absolute minimum values since the drift measurement was started This measurement g...

Страница 79: ...avelength and power drift values subtracted from the maximum drift values 5 In the List by WL and List by Power displays use the and softkeys to view the reference values wavelength and power values o...

Страница 80: ...annot measure coherence length of light emitting diodes LEDs or distributed feedback DFB lasers When you select coherence length measurements the Keysight 86120B displays the following four values Coh...

Страница 81: ...of the envelope peaks is given by the following equation OPD is the optical path delay and Lc is the coherence length Thus at an optical path delay equal to the coherence length the envelope peaks ar...

Страница 82: ...s defined as the height of the fringe visibility envelope midway between the zero optical path delay peak and the next peak relative to the height of the envelope peak at zero path delay The beta fact...

Страница 83: ...data 95 Monitoring the Instrument 96 Status registers 96 Queues 101 Reviewing SCPI Syntax Rules 103 Example Programs 108 Example 1 Measure a DFB laser 110 Example 2 Measure WDM channels 112 Example 3...

Страница 84: ...rial Description of Hewlett Packard Interface Bus 1987 Hewlett Packard Company SCPI Standard Commands for Programmable Instru ments 1995 International Institute of Electrical and Electronics Engineers...

Страница 85: ...nts the LOCAL softkey from being displayed If the instrument is in local lockout mode all the softkeys may be blanked For example if the instrument is first placed in local lockout mode and then place...

Страница 86: ...ommand is that it sets the Keysight 86120B into the single measurement acquisition mode Because the READ and MEASure data queries expect this mode their proper operation is ensured Establish the wavel...

Страница 87: ...rrected data buffer and a corrected data buffer With each scan of the input wavelength range the analog to digital converter loads 65 536 data values into the uncorrected data buffer This is considere...

Страница 88: ...nsists of an amplitude and wavelength measurement Amplitude and wavelength correction factors are applied to this data For a listing of the programming commands including a cross reference to front pa...

Страница 89: ...elevation correction values selects readings for air or vacuum and enters amplitude offsets Configures instrument for measuring broadband devices and chirped lasers Queries time domain values of the...

Страница 90: ...Figure FETCh READ and MEASure MEASure ARRay POWer Average Wavelength Wavenumber or Frequency CALCulate2 PWAVerage STATe CALCulate2 DATA Total Power W dBm CALCulate2 PWAVerage STATe CALCulate2 DATA Las...

Страница 91: ...e following command MEASure SCALar POWer WAVelength MAX Specifying SCALar places the display in the single wavelength format and returns a single value to the computer Specifying ARRay places the disp...

Страница 92: ...continuous measurement acquisition mode Because READ contains an INIT IMM command which expects the single measurement acquisition mode an error is generated and the INIT command is ignored FETCh comm...

Страница 93: ...tion setup by the CONFigure command The instrument returns a string which is the last instrument function sent by a CONFigure command or MEASure query The returned string is in the short command form...

Страница 94: ...WLIMit STOP WNUMber CALCulate3 SNR AUTO SENSe CORRection ELEVation INITiate CONTinuous INITiate IMMediate The following additional commands are also non sequential commands if CALCu late3 SNR AUTO is...

Страница 95: ...se the ELEVation command causes the recalculation of the data which is like sending the INIT IMM command When the actual INIT IMM is sent the error occurs because the command is already in progress OU...

Страница 96: ...ect a drift measurement you can additionally select one of the following additional states CALC3 DRIF DIFF STAT difference CALC3 DRIF MAX STAT maximum drift CALC3 DRIF MIN STAT minimum drift CALC3 DRI...

Страница 97: ...ed in the string The string does not contain a first value which specifies the string length This is shown in the following example OUTPUT 720 CALCulate1 POINts ENTER 720 Length OUTPUT 720 CALCulate1...

Страница 98: ...us Subsystem on page 206 Status registers The Keysight 86120B provides four registers which you can query to monitor the instrument s condition These registers allow you to determine the following ite...

Страница 99: ...methods is that the serial poll command reads bit 6 as the Request Service RQS bit and clears the bit which clears the SRQ interrupt The STB command reads bit 6 as the Master Summary Status MSS and do...

Страница 100: ...98 Programming Monitoring the Instrument...

Страница 101: ...5 ESB in the Status Byte Register Table 4 7 Bits in Operation Status Register Bit Definition 0 not used 1 SETTling indicating that the instrument is waiting for the motor to reach the proper position...

Страница 102: ...asks for the OPERation Status and QUEStionable Status registers are set and queried using the STATus subsystem s ENABle commands Use the ESE common command to set or query the mask for the Standard Ev...

Страница 103: ...gister bits that are not enabled still respond to their corre sponding conditions that is they are set if the corresponding event occurs How ever because they are not enabled they do not generate a su...

Страница 104: ...queue is 30 29 positions for the error messages and 1 position for the Queue overflow message The error queue is read with the SYSTEM ERROR query Executing this query reads and removes the oldest err...

Страница 105: ...command string from the commands listed in this book and place the string in your program lan guage s output statement For commands other than common commands include a colon before the subsystem name...

Страница 106: ...racters Instrument responses however are always returned in uppercase Combine commands in the same subsystem You can combine commands from the same subsystem provided that they are both on the same le...

Страница 107: ...n the following line OUTPUT 720 INIT CONT ON Separate multiple parameters with a comma Spaces can be added around the commas to improve readability OUTPUT 720 MEAS SCAL POW FREQ 1300 MAX White space W...

Страница 108: ...instruction terminator is received The terminator may be either a new line NL character the End Or Identify EOI line asserted or a combination of the two All three ways are equivalent Asserting the E...

Страница 109: ...SIC the controller input statement ENTER 720 Range passes the value across the bus to the controller and places it in the variable Range A newline character is appended to the response Sending another...

Страница 110: ...HP BASIC programming language Many subroutines are repeated in the examples The first five example programs contain several common subroutines These rou tines along with one function are described in...

Страница 111: ...bits enabled by the Set_ese subroutine BIT Cme 5 BIT Cme 4 BIT Cme 2 This subroutine is called in examples 1 through 5 However it is modified in exam ples 3 4 and 5 to allow it to indicate the last p...

Страница 112: ...nstrument Mwm ASSIGN Mwm TO 720 Set_ese PRINT USING 37A 33A Multi Wavelength Meter Identity is FNIdentity OUTPUT Mwm INIT CONT OFF ON TIMEOUT 7 5 CALL Err_mngmt OUTPUT Mwm MEAS SCAL POW WAV ENTER Mwm...

Страница 113: ...Programming Example Programs Identity DEF FNIdentity COM Instrument MwmV DIM Identity 50 Identity OUTPUT Mwm RST OUTPUT Mwm OPC ENTER Mwm Opc_done OUTPUT Mwm IDN ENTER Mwm Identity RETURN Identity FN...

Страница 114: ...on to this section for a description of each subroutine that is contained in this program COM Instrument Mwm ASSIGN Mwm TO 720 ON ERROR GOTO Error_msg Set_ese PRINT USING 37A 33A Multi Wavelength Mete...

Страница 115: ...RR ENTER Mwm Err_msg PRINT Err_msg UNTIL NOT BIT Cme 2 AND NOT BIT Cme 4 AND NOT BIT Cme 5 AND Err 0 Subend SUBEND Set_ese SUB Set_ese COM Instrument Mwm OUTPUT Mwm ESE IVAL 00110100 2 SUBEND Identity...

Страница 116: ...introduction to this section for a description of each subroutine that is contained in this program COM Instrument Mwm ASSIGN Mwm TO 720 DIM Key 1 ON ERROR GOTO Error_msg Set_ese PRINT USING 37A 33A...

Страница 117: ...ON Tempo 10 ALLOCATE Current_diff_wl 1 Nb_pt ALLOCATE Current_diff_pw 1 Nb_pt Query drift wavelengths and powers OUTPUT Mwm CALC3 DATA WAV ENTER Mwm USING K Current_diff_wl OUTPUT Mwm CALC3 DATA POW...

Страница 118: ...IL NOT BIT Cme 2 AND NOT BIT Cme 4 AND NOT BIT Cme 5 AND POS Err_msg 0 Subend SUBEND Set_ese SUB Set_ese COM Instrument Mwm OUTPUT Mwm ESE IVAL 00110100 2 SUBEND Identity DEF FNIdentity COM Instrument...

Страница 119: ...i Wavelength Meter Identity is FNIdentity ON TIMEOUT 7 5 CALL Err_mngmt Cmd_opc RST Change to list by wavelength display Cmd_opc CONF ARR POW WAV Trigger and wait for one measurement Cmd_opc INIT Cmd_...

Страница 120: ...Err_mngmt SUB Err_mngmt OPTIONAL Cmd_msg COM Instrument Mwmt DIM Err_msg 255 INTEGER Cme CLEAR Mwm REPEAT OUTPUT Mwm ESR ENTER Mwm Cme OUTPUT Mwm SYST ERR ENTER Mwm Err_msg IF NPAR 0 AND NOT POS Err_m...

Страница 121: ...Identity is FNIdentity ON TIMEOUT 7 5 CALL Err_mngmt Cmd_opc RST OUTPUT Mwm MEAS ARR POW WAV ENTER Mwm USING K Nb_pt ALLOCATE Current_wl 1 Nb_pt ENTER Mwm USING K Current_wl OUTPUT Mwm FETC ARR POW E...

Страница 122: ...UTPUT Mwm SYST ERR ENTER Mwm Err_msg IF NPAR 0 AND NOT POS Err_msg 0 THEN PRINT This command Cmd_msg makes the following error IF NOT POS Err_msg 0 THEN PRINT Err_msg UNTIL NOT BIT Cme 2 AND NOT BIT C...

Страница 123: ...Keysight 86120B s absolute accuracy at 1550 nm In order to run this program the tunable laser source s firmware must support the automatic alignment command WAVEACT The program uses the following mea...

Страница 124: ...What wavelength nm do you wish to have Target_wl Target_wl Target_wl 1 OE 9 PRINT the target wavelength is Target_wl Set wavelength of tunable laser source OUTPUT Tls WAVE VAL Target_wl OUTPUT Tls OUT...

Страница 125: ...s instrument SAV Saves an instrument state SRE Sets bits in service request enable register STB Queries value of status byte TRG Triggers acquisition of measurement data TST Performs an instrument sel...

Страница 126: ...ngth for the wavelength limit range I CALCulate2 WLIMit STARt WNUMber Sets the starting wavenumber for the wavelength limit range I CALCulate2 WLIMit STOP FREQuency Sets the stopping frequency for the...

Страница 127: ...into the reference list I CALCulate3 DRIFt REFerence STATe Turns the drift state on and off so that CALC3 DATA will return the reference signal list I CALCulate3 DRIFt STATe Turns the drift measureme...

Страница 128: ...ection OFFSet MAGNitude Sets the power offset value used by the instrument S SENSe CORRection MEDium Sets the instrument to return the wavelength reading in a vacuum when the parameter is on Parameter...

Страница 129: ...Gger Subsystem ABORt Stops the current measurement sequence S INITiate IMMediate Places the instrument into the initiated state and initiates a new measurement sequence S INITiate CONTinuous Sets the...

Страница 130: ...GRAPhics STATe BAR ON DISPlay WINDow GRAPhics STATe BROAD SENSe CORRection DEVice BROad CAL See ELEV PWR OFS STD AIR and VACUUM CM 1 MEASure ARRay POWer WNUMber COH LEN MEASure LENGth COHerence CLENgt...

Страница 131: ...OWer STATe PEAK DISPlay MARKer MAXimum Peak WL See NEXT PK NEXT WL PEAK PREV PK and PREV WL PK EXC CALCulate2 PEXCursion PK THLD CALCulate2 PTHReshold POWER UNIT POWer Preset SYSTem PRESet PREV PK DIS...

Страница 132: ...Z MEASure ARRay POWer FREQuency UNITS UNIT POWer UPDATE Measurement Instructions and CALCulate1 TRANsform FREQuency POINts USER CALCulate3 SNR AUTO OFF USER WL CALCulate3 SNR REFerence WAVelength UW U...

Страница 133: ...ystem 174 CONFigure Measurement Instruction 196 DISPlay Subsystem 196 FETCh Measurement Instruction 199 HCOPy Subsystem 200 MEASure Measurement Instruction 200 READ Measurement Instruction 201 SENSe S...

Страница 134: ...le brackets indicate values entered by the programmer Or indicates a choice of one element from a list Square brackets indicate that the enclosed items are optional When several items are enclosed by...

Страница 135: ...gister Syntax CLS Description With the exception of the output queue all queues that are summarized in the status byte register are emptied The error queue is also emptied Neither the event status ena...

Страница 136: ...do not change the register The ESE query returns the value of the event status enable register Query Response integer is a mask from 0 to 255 Example OUTPUT 720 ESE 32 In this example the ESE 32 comma...

Страница 137: ...read the byte The following table shows each bit in the event status register and its bit weight The register is cleared when it is read Query Response integer ranges from 0 to 255 Table 5 15 Standard...

Страница 138: ...ment s serial number The last entry in the string is the firmware version number this value may vary between instruments Agilent 86120B USaaaabbbb 2 000 Example DIM Id 50 OUTPUT 720 IDN ENTER 720 Id P...

Страница 139: ...e ASCII 1 is returned by the instrument Be sure the computer s timeout limit is at least two seconds since some of the Keysight 86120B commands take approximately one second to complete Query Response...

Страница 140: ...urrent data is marked as invalid and a measurement query such as FETCh results in error number 230 Data corrupt or stale You must initiate a new sweep with INIT IMM before you can use the FETCh com ma...

Страница 141: ...39 Programming Commands Common Commands excursion peak threshold power offset signal to noise auto mode on off wave length limit on off wavelength limit start wavelength limit stop and signal to noise...

Страница 142: ...f Measurement acquisition single Wavelength calibration vacuum Elevation correction value 0 meters Wavelength units nm Amplitude units dBm Power offset 0 dB Peak threshold 10 dB Peak excursion 15 dB M...

Страница 143: ...atus byte register A bit set to one in the service request enable register enables the corresponding bit in the status byte register to generate a service request A zero disables the bit The following...

Страница 144: ...Response integer from 0 to 63 or from 128 to 191 Example OUTPUT 720 SRE 32 In this example the command enables ESB event summary bit 5 in the status byte register to generate a service request Table...

Страница 145: ...l of the bit weights of all of the bits set to one at the time you read the byte The following table shows each bit in the status byte register and its bit weight The STB query does not affect the con...

Страница 146: ...n error is generated Example The following example starts the data acquisition according to the current settings OUTPUT 720 TRG TST The TST test query starts a self test on the instrument Syntax TST D...

Страница 147: ...e WAI command prevents the instrument from executing any further commands until the current command has finished executing Syntax WAI Description All pending operations are completed during the wait p...

Страница 148: ...e domain by rectifying and low pass filtering the interferogram The resulting waveform is then curve fit into a decaying exponential Refer to To measure coher ence length on page 78 When the SCALar co...

Страница 149: ...ds Measurement Instructions The commands in this subsystem have the following command hierarchy MEASure READ FETCh CONFigure ARRay SCALar POWer FREQuency WAVelength WNUMber SCALar LENGth COHerence ALP...

Страница 150: ...e dis play is placed in the list by power mode Returned values are in the current power units Wavelength units are not affected expected_value Constants MAXimum Displays the highest power signal MINim...

Страница 151: ...line is an example of a returned string when MEAS SCAL POW MAX is sent 5 88346500E 000 If six laser lines are located and MEAS ARR POW is sent the following string could be returned Notice that the fi...

Страница 152: ...se value will be limited to either 0 01 or 0 001 whichever is closer MAXimum resolution is equivalent to the FAST measurement update mode MINi mum resolution is equivalent to the NORMAL measurement up...

Страница 153: ...EQ 230 8THZ MIN READ SCAL POW FREQ 230 8THZ MEAS SCAL POW FREQ 230 8THZ Query Response The following line is an example of a returned string when MEAS SCAL POW FREQ MAX is sent 1 94055176E 014 If six...

Страница 154: ...a unitless number whose value will be limited to either 0 01 or 0 001 whichever is closer Returned values are in meters Displayed units are nanometers Power units are not affected expected_value Const...

Страница 155: ...00NM MEAS SCAL POW WAV 1300NM Query Response The following line is an example of a returned string when MEAS SCAL POW WAV MAX is sent 1 5529258E 006 If six laser lines are located and MEAS ARR POW WAV...

Страница 156: ...mber whose value will be limited to either 0 01 or 0 001 whichever is closer Returned values are in inverse meters Displayed units are inverse centimeters Power units are not affected expected_value C...

Страница 157: ...is present the following response would be returned to the computer 6 45286262E 005 Notice that the returned units are m 1 If six laser lines are measured and MEAS ARR POW WNUM is sent the following...

Страница 158: ...nstant is a unitless ratio MEASure SCALar LENGth COHerence CLENgth Queries the coherence length of the input signal in meters Syntax LENGth COHerence CLENgth Attribute Summary Query Only MEASure SCALa...

Страница 159: ...rrected frequency spectrum data In NORMAL measurement update mode 34 123 values are returned If the Keysight 86120B is set for FAST measurement update mode low resolution 4 268 values are returned The...

Страница 160: ...lobytes of data 34 123 values can be returned to the computer When FAST measurement update is specified over 72 kilobytes of data 4 268 values can be returned The following string is a typical example...

Страница 161: ...spacing between values is not uniform in wavelength units The values returned are in ascending optical frequency Only the frequency domain data corresponding to 700 1650 nm wavelength in vacuum is re...

Страница 162: ...FFT size of 34 123 A FAST updated display corresponds to an FFT size of 4 268 These values are a subset of the uncor rected data buffer shown in the figure that is located in Making Measurements on p...

Страница 163: ...161 Programming Commands CALCulate1 Subsystem Query Response For normal update 34123 For fast update 4268...

Страница 164: ...Culate2 commands to query corrected values frequency spectrum data The commands in this subsystem have the following command hierarchy CALCulate2 DATA PEXCursion POINts PTHReshold PWAVerage STATe WLIM...

Страница 165: ...CALC2 PWAV STAT is on the power weighted average wave number is returned Attribute Summary Preset State not affected SCPI Compliance standard Query Only Description Use the CALC2 POIN query to determ...

Страница 166: ...n the peak excursion plus the amplitudes of the closest local minima on either side of the peak This command works in conjunction with the peak threshold setting Refer to PTHReshold on page 165 Changi...

Страница 167: ...returned by the CALC2 DATA query Query Response For example if six laser lines are located 6 PTHReshold Sets the peak threshold limit used by the instrument to determine valid laser line peaks Syntax...

Страница 168: ...ces the instrument in the power weighted average mode Syntax CALCulate2 PWAVerage STATe ON OFF 1 0 Attribute Summary Preset State off RST State off Description When the state is on the CALC2 DATA POW...

Страница 169: ...peaks over the full wavelength range If you want to measure signals over a nar rower wavelength range set this function on to avoid identifying spurious second harmonic peaks Whenever the Keysight 86...

Страница 170: ...liance instrument specific Description This command sets the starting range for the wavelength limit in Hertz The start frequency value must be less than or equal to the stop frequency value or the st...

Страница 171: ...rt wavelength value must be less than or equal to the stop wavelength value or the start wavelength will be clipped to the stop wavelength and a Data out of range error will be generated Setting the s...

Страница 172: ...liance instrument specific Description This command sets the starting range for the wavelength limit The default units for the real parameter value are m 1 The start wavenumber value must be less than...

Страница 173: ...liance instrument specific Description This command sets the stopping range for the wavelength limit The default units for the real parameter are Hz The stop frequency value must be greater than or eq...

Страница 174: ...e wavelength limit The default units for the real parameter are meters The stop wavelength value must be greater than or equal to the start wavelength value or the stop wavelength will be clipped to t...

Страница 175: ...ance instrument specific Description This command sets the stopping range for the wavelength limit The default units for the real parameter are inverse meters The stop wavenumber value must be less th...

Страница 176: ...ise mea surements The commands in this subsystem have the following command hierar chy CALCulate3 ASNR CLEar COUNt STATe DATA DELTa POWer STATe PRESet REFerence FREQuency POWer WAVelength WNUMber WAVe...

Страница 177: ...This command clears the number of measurements used in the average signal to noise calculation The current measurement is used as the new reference for the average signal to noise calculation ASNR COU...

Страница 178: ...the number of measurements to be used for the average signal to noise calculation If this count is changed while the average signal calculation is on and the new count is less than the number of meas...

Страница 179: ...n is on will generate a Settings conflict error When the calculation is first turned on the lines measured in the current measure ment will be used as the reference values for the signal to noise rati...

Страница 180: ...d by the query depends upon which calculation state is on If no cal culation state is on an error is generated The returned data is comma delimited The following string is a typical example of six val...

Страница 181: ...s normalized to the power level of the reference laser line The power of the reference laser line is returned as an absolute power unnormalized The fre quency data returned is the array of absolute fr...

Страница 182: ...700 nm SCPI Compliance instrument specific Description The reference will be the laser line at the frequency closest to the frequency entered Subsequent measurements will use the frequency closest to...

Страница 183: ...00 0 nm MAXimum 1650 0 nm Attribute Summary Preset State 700 nm 428 6 THz RST State 700 nm 428 6 THz laser line SCPI Compliance instrument specific Description The reference will be the laser line at...

Страница 184: ...61 cm 1 MAXimum 14 286 cm 1 Attribute Summary Preset State 14 286 cm 1 700 nm RST State 14 286 cm 1 700 nm SCPI Compliance instrument specific Description The reference will be the laser line at the w...

Страница 185: ...the reference For the CALC3 DATA query the power data returned is the array of absolute pow ers measured for each laser line The frequency data is the array of frequency values normalized to the frequ...

Страница 186: ...except the reference For the CALC3 DATA query the power data returned is the array of powers nor malized to the power of the reference laser line The power of the reference laser line is returned as a...

Страница 187: ...strument specific Description Use the CALC3 DRIF PRES command to turn off all the drift states before turning on this state The CALC3 DATA query returns the maximum power and frequency minus the minim...

Страница 188: ...iance instrument specific Description Use the CALC3 DRIF PRES command to turn off all the drift states before turning on this state The CALC3 DATA query returns the maximum power and frequency Note On...

Страница 189: ...liance instrument specific Description Use the CALC3 DRIF PRES command to turn off all the drift states before turning on this state The CALC3 DATA query returns the minimum power or frequency Note On...

Страница 190: ...cted by SCPI Compliance instrument specific Command Only Description This command allows the CALC3 DATA query to return the difference between the current measurement and the reference DRIFt REFerence...

Страница 191: ...n this command is set to on the CALC3 DATA command returns the refer ence laser lines Use the CALC3 DRIF PRES command to turn off all the drift states before turning on the drift reference state Note...

Страница 192: ...e reference All subsequent measurements take the new data subtract the reference data and display the differences in wavelengths and powers The CALC3 DATA query returns the power and frequency of the...

Страница 193: ...ific Query Only Description The value returned is the number of points returned by the CALC3 DATA query PRESet Turns off any CALCulate3 calculation that is on Syntax CALCulate3 PRESet Attribute Summar...

Страница 194: ...rated reference frequency OFF Selects user entered reference frequency Attribute Summary Preset State on RST State on SCPI Compliance instrument specific Description The command argument allows you to...

Страница 195: ...a frequency value that is within the following limits Constant Description MINimum 181 6924 THz MAXimum 428 2750 THz Attribute Summary Preset State unaffected by RST State 193 4145 THz 1550 0 nm in a...

Страница 196: ...in the following limits Constant Description MINimum 700 0 nm MAXimum 1650 0 nm Attribute Summary Preset State unaffected by RST State 1550 0 nm in a vacuum SCPI Compliance instrument specific Descrip...

Страница 197: ...tribute Summary Preset State unaffected by RST State 6451 614 cm 1 SCPI Compliance instrument specific Description After entering this value use the SNR AUTO command to configure the instrument to use...

Страница 198: ...stem The commands in this subsystem have the following command hierarchy DISPlay MARKer MAXimum LEFT NEXT PREVious RIGHt WINDow GRAPhics STATe Note Only one STATe command can be turned on at any one t...

Страница 199: ...er line Syntax DISPlay MARKer MAXimum LEFT Attribute Summary Preset State marker set to maximum power laser line RST State marker set to maximum power laser line SCPI Compliance instrument specific Co...

Страница 200: ...has the next higher power level Syntax DISPlay MARKer MAXimum PREVious Attribute Summary Preset State marker set to maximum power laser line RST State marker set to maximum power laser line SCPI Compl...

Страница 201: ...marker is moved WINDow GRAPhics STATe Turns on and off the display of the power bars Syntax DISPlay WINDow GRAPhics STATe ON OFF 1 0 Attribute Summary Preset State on RST State on SCPI Compliance sta...

Страница 202: ...Prints measurement results on a printer Syntax HCOPy IMMediate Attribute Summary Preset State none RST State none SCPI Compliance standard Command Only Description Connect the printer to the Keysight...

Страница 203: ...ent Instructions on page 146 SENSe Subsystem Use the SENSe commands to correct measurement results for elevation above sea level and to select between measurements in air or vacuum You can also enter...

Страница 204: ...tate NARRow RST sets this value to NARRow SCPI Compliance instrument specific Description The narrow bandwidth algorithm used for measuring lasers determines the wave length based upon the peak The br...

Страница 205: ...ific Description Changing the elevation value causes the current data to be reprocessed Query Response The query form returns the current elevation setting as shown in the following example 1500 CORRe...

Страница 206: ...pressure 760 torr Temperature 15 C Relative humidity 0 CORRection OFFSet MAGNitude Enters an offset for amplitude values Syntax SENSe CORRection OFFSet MAGNitude real MINimum MAXimum real is the loga...

Страница 207: ...e pattern on the photodetector as a function of the Michelson interferometer optical path delay The time domain data is sampled at uniform optical path delay increments of half the reference laser wav...

Страница 208: ...000 Notice that only values are returned to the computer There is no first value that indi cates the number of values contained in the string as there is for example with the FETCh READ and MEASure c...

Страница 209: ...UTPUT 720 STATUS OPERATION CONDITION OPERation QUEStionable ENABle Sets the enable mask for the questionable or operation event register Syntax STATus OPERation QUEStionable ENABle value integer an in...

Страница 210: ...ummary Preset State none RST State none SCPI Compliance standard Query Only Description The response will be a number from 0 to 32767 indicating which bits are set Read ing the register clears the reg...

Страница 211: ...bits in the event register which can be set by positive transitions of the corre sponding bits in the condition register Syntax STATus OPERation PTRansition integer integer an integer from 0 to 65535...

Страница 212: ...e none SCPI Compliance standard Command Only Description The PRESet command is defined by SCPI to affect the enable register If you want to clear all event registers and queues use the CLS command Exa...

Страница 213: ...ion The Keysight 86120B has a 30 entry error queue The queue is a first in first out buffer Repeatedly sending the query SYSTEM ERROR returns the error numbers and descriptions in the order in which t...

Страница 214: ...character is followed by one digit which indicates how many of the following digits convey the byte count The next digits give the actual byte count For example in the listing below 4387 bytes are ind...

Страница 215: ...able 5 20 Instrument Conditions 1 of 2 Item Settings after Preset Key Pressed Settings after Power Turned On Display mode single wavelength last statea Wavelength range limiting on last state Start wa...

Страница 216: ...eference signal position 700 nm 700 nm Signal to Noise Measurements measurement off off wavelength reference auto last state user wavelength not affected last state number of averages 100 last state G...

Страница 217: ...ht 86120B complies with Syntax SYSTem VERSion Attribute Summary Preset State none RST State none SCPI Compliance standard Query Only Description The SCPI version used in the Keysight 86120B is 1995 0...

Страница 218: ...the following command hierarchy ABORt INITiate CONTinuous IMMediate ABORt Halts the current measurement sequence and places the instrument in the idle state Syntax ABORt Attribute Summary Preset Stat...

Страница 219: ...continuously measures the input spectrum INITiate IMMediate Initiates a new measurement sequence Syntax INITiate IMMediate Attribute Summary Non sequential command Preset State none SCPI Compliance st...

Страница 220: ...tts linear or dBm logarithmic Syntax UNIT POWer W DBM Attribute Summary Preset State dBm RST State dBm SCPI Compliance standard Non sequential command Always use an OPC query or a WAI command to ensur...

Страница 221: ...6 Test 1 Absolute Wavelength Accuracy 221 Test 2 Sensitivity 222 Test 3 Polarization Dependence 223 Test 4 Optical Input Return Loss 224 Test 5 Amplitude Accuracy and Linearity 226 Performance Tests...

Страница 222: ...omputer None of these tests require access to the interior of the instrument Test 1 Absolute Wavelength Accuracy Test 2 Sensitivity Test 3 Polarization Dependence Test 4 Optical Input Return Loss Test...

Страница 223: ...s HeNe gas lasers C A U T I O N Do not exceed 18 dBm source power The Keysight 86120B s input circuitry can be damaged when total input power exceeds 18 dBm Procedure Use three or four light standards...

Страница 224: ...for a reading of 0 dBm on the power meter Record the attenuator s setting Attenuation at 0 dBm ____________ 4 Adjust the attenuator for a reading of 35 dBm on the power meter Record the attenuator s...

Страница 225: ...and allow them to warm up 2 Set the polarization controller to a scan rate of 5 3 On the Keysight 86120B press the Preset key 4 Connect the laser s optical output to the polarization controller s opt...

Страница 226: ...10 HRL end of the patchcord to the return loss module s OUTPUT connector Terminate the other end of the cable 5 Zero the return loss module 6 Turn on the source module 7 Remove the termination from t...

Страница 227: ...to FC PC cable 10 Make a low reflection termination in the HMS 10 HRL to FC APC patchcord Do this by wrapping the cable 6 times around a 5 mm diameter mandrel 11 The return loss module measures the t...

Страница 228: ...er meter for 1550 nm 6 Adjust the optical attenuator so that the power meter measures a power level of 0 dBm 7 Enter the attenuator setting and the measured power level in the first row of Table 6 22...

Страница 229: ...he following line minimum drift ____________ 18 Use the values recorded in Step 8 Step 16 and Step 17 to calculate the power correction offset value as shown in the following equation Enter the calcul...

Страница 230: ...d Linearity amplitude steps are within the linearity specification Table 6 22 Linearity Data Values Desired Power dBm Attenuator Setting Power Meter Reading Keysight 86120B Power Reading Linearity 0 1...

Страница 231: ...229 Performance Tests Test 5 Amplitude Accuracy and Linearity...

Страница 232: ......

Страница 233: ...7 Definition of Terms 233 Specifications 235 General Safety Information 239 Specifications and Regulatory Information...

Страница 234: ...e temperature range 0 C to 55 C and relative humidity 95 unless otherwise noted All specifications apply after the instrument s temperature has been stabilized after 15 minutes of continuous operation...

Страница 235: ...icates the minimum wavelength separation of two laser lines required to measure each wavelength simultaneously Two laser lines closer in wavelength than the minimum resolvable separation are not resol...

Страница 236: ...s the ability to measure the wavelength and power of a weak laser line in the proximity of a specified stronger laser line and separated by the specified amount Input Power Maximum displayed level ind...

Страница 237: ...ly when the in strument is configured to measure broadband devices Refer to Measuring broad band devices and chirped lasers on page 46 Wavelength Range 700 1650 nm 182 428 THz Absolute accuracy lines...

Страница 238: ...earity 1200 nm to 1600 nm lines above 30 dBm 0 3 dB Polarization dependence 1200 1600 nm 0 5 dB 700 1650 nm characteristic 1 0 dB Display resolution 0 01 dB Sensitivity 700 900 nm single line input 20...

Страница 239: ...connectors 35 dB With angled contacting connectors Option 022 50 dB Measurement Cycle Time Normal update mode characteristic 1 0 s 1 measurement per second Fast update mode characteristic 0 33 s 3 me...

Страница 240: ...W max Voltage 100 115 230 240 V Frequency 50 60 Hz Altitude Up to 2000 m 6600 ft Operating temperature 0 C to 55 C Maximum relative humidity 80 for temperatures up to 31 C decreasing linearly to 50 r...

Страница 241: ...Compliance with Canadian EMC Requirements This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme la norme NMB 001 du Canada Notice for Germany Noise Declaration of Conformity A...

Страница 242: ...240 Specifications and Regulatory Information Declaration of Conformity Declaration of Conformity For latest DoC please click on the following link http keysight com go conformity...

Страница 243: ...241 Specifications and Regulatory Information Product Overview Product Overview Front view of instrument Rear view of instrument...

Страница 244: ...242 Specifications and Regulatory Information Product Overview...

Страница 245: ...8 Instrument Preset Conditions 244 Menu Maps 246 Error Messages 253 Connector interfaces order separately 259 Power Cords 260 For Assistance and Support 262 Reference...

Страница 246: ...last statea Wavelength range limiting on last state Start wavelength 1200 nm last state Stop wavelength 1650 nm last state Graphical display off off Measurement acquisition continuous last state Wave...

Страница 247: ...rence signal position 700 nm 700 nm Signal to Noise Measurements measurement off off wavelength reference auto last state user wavelength not affected last state number of averages 100 last state GPIB...

Страница 248: ...eys The maps show which softkeys are displayed after pressing a front panel key they show the relationship between softkeys The softkeys in these maps are aligned vertically instead of horizontally as...

Страница 249: ...247 Reference Menu Maps Appl s Menu Display Avg WL Menu There is no menu associated with this key Measurement Cont Menu There is no menu associated with this key...

Страница 250: ...248 Reference Menu Maps Display List by Power Menu Display List by WL Menu...

Страница 251: ...249 Reference Menu Maps Delta On Menu Delta Off Menu...

Страница 252: ...250 Reference Menu Maps Display Peak WL and System Preset Menus Measurement Single Menu There is no menu associated with this key...

Страница 253: ...251 Reference Menu Maps System Print Menu...

Страница 254: ...252 Reference Menu Maps System Setup Menu...

Страница 255: ...t Specific Error Messages 1 of 3 Error Number Error Message 1 BAD CHECKSUM FROM MOTOR 2 MOTOR COMMUNICATION PROBLEM 3 MOTOR NOT MOVING 4 MOTOR INDEX PULSE NOT FOUND 5 MOTOR CHIP SET INIT FAILED 6 MOTO...

Страница 256: ...AD CAL ROM DATA 27 BAD CAL ROM DATA 28 BAD CAL ROM DATA 29 BAD CAL ROM DATA 30 NVSRAM WRITE OPERATION FAILED 31 SOFTWARE INITIALIZATION FAIL 32 HARDWARE INITIALIZATION FAIL 33 INITIALIZATION TIMEOUT 3...

Страница 257: ...D IN COH LEN 44 NOT ALLOWED IN S N 45 UNKNOWN KEYPRESS 46 NUM LINES NUM REFS 47 NUM LINES NUM REFS 48 NO REFERENCE SIGNAL 49 GAIN RANGING ERROR 50 INCOMPATIBLE HARDWARE 51 UNKNOWN ERROR Table 8 24 Ins...

Страница 258: ...e error 105 GET not allowed 108 Parameter not allowed 109 Missing parameter 112 Program mnemonic too long 113 Undefined header 120 Numeric data error 121 Invalid character in number 123 Exponent too l...

Страница 259: ...continuous measurement mode 221 Settings conflict Caused by trying to set the instrument to a state that is not allowed For example turning on drift maximum and drift minimum state simultaneously or t...

Страница 260: ...350 Too many errors 400 Query error 410 Query INTERRUPTED 420 Query UNTERMINATED 430 Query DEADLOCKED 440 Query UNTERMINATED after indef resp Query was unterminated after an indefinite response Table...

Страница 261: ...t Number Description 81000FI FC connector interface FC PC 81000HI E 2000 connector interface 81000KI SC connector interface 81000LI LC connector interface 81000MI MU connector interface 81000NI FC con...

Страница 262: ...NZSS198 ASC 90 79 200 87 221 Gray Mint Gray Australia New Zealand 250V 8120 1689 8120 1692 8120 2857p Straight CEE7 Y11 90 Straight Shielded 79 200 79 200 79 200 Mint Gray Mint Gray Coco Brown East a...

Страница 263: ...rk 250V 8120 4211 8120 4600 Straight SABS164 90 79 200 79 200 Jade Gray Republic of South Africa India 100V 8120 4753 8120 4754 Straight MITI 90 90 230 90 230 Dark Gray Japan Plug Type Cable Part No P...

Страница 264: ...262 Reference For Assistance and Support For Assistance and Support Please click on the following link http www keysight com find assist...

Страница 265: ...ternal attenuation audio modulation effects of 52 60 AUTO programming command 192 softkey 72 AVERAGE annotation 43 average wavelength 3 43 Avg WL key 43 44 B BAR OFF softkey 48 BAR ON softkey 48 beta...

Страница 266: ...s 31 covers dust 260 cursor 42 D damaged shipment 15 data corrupt or stale 106 138 257 data questionable 257 DATA programming command 158 163 178 204 DBM softkey 50 default GPIB address 83 DELay progr...

Страница 267: ...ity function 109 foam swabs 31 FREQuency programming command 150 180 193 front panel adapters 259 labels 241 lockout 83 G GPIB address 83 address changing from front panel 83 address default 83 softke...

Страница 268: ...acquisition 51 cycle time 234 237 definition of peaks 52 elevation effects of 63 flatness 59 via GPIB 85 instructions 103 146 laser drift 75 laser line separation 56 low power laser lines effects of...

Страница 269: ...THLD softkey 55 POINts programming command 160 165 191 polarization dependence 234 236 power bar 4 40 48 maximum input 4 maximum measurable 38 measuring total 43 163 166 peak 41 separation 56 state wh...

Страница 270: ...nt 15 service 34 request enable register 100 141 returning for 34 sales and service offices 262 Set_ese subroutine 108 settings conflict error 94 166 177 179 183 184 186 187 189 190 196 257 Setup key...

Страница 271: ...rogramming command 203 VACUUM softkey 21 64 vacuum measurements in 63 VERSion programming command 215 W WAI 145 wave number 50 wavelength definition of 233 input range 38 peak 41 range 44 84 167 separ...

Страница 272: ......

Страница 273: ...This information is subject to change without notice Keysight Technologies 2000 2014 Edition 3 November 2014 www keysight com...

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