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NF WF1945B Instruction Manual Download Page 127

 

 

 

 

WF1945B

 

4-65

 

 

 

4.7 Equivalent noise bandwidth 

 

 

 

The density of noise generated by the WF1945B is as shown in the following figure (a) "Frequency 
characteristics of noise generated by the WF1945B." 
The effective values (rms) of (a) are equal to those of white noise in the figure (b) "Frequency characteristics 
of white noise," that follows.    This equivalent bandwidth (500 kHz) is called the equivalent noise bandwidth. 
 

 

 

(a) Frequency characteristics of noise 

generated by the WF1945B 

(b) Frequency characteristics of white 

noise 

500kHz 

Noise density 
[V/  Hz ] 

Noise density
[V/  Hz ] 

About 320 kHz 

-3dB 

Frequency 

Frequency 

Effective values are equal 

 

 

Summary of Contents for WF1945B

Page 1: ...INSTRUCTION MANUAL NF Corporation http www nfcorp co jp NF Corporation 6 3 20 Tsunashima higashi Kohoku ku Yokohama 223 8508 JAPAN WF1945B MULTIFUNCTION SYNTHESIZER MULTIFUNCTION SYNTHESIZER WF1945B...

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Page 3: ...DA00012505 002 WF1945B MULTIFUNCTION SYNTHESIZER Instruction Manual...

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Page 5: ...to a separate volume for a description of remote control GPIB or USB Section 1 Overview Provides a general description of the equipment and a simple outline of the operating principles Section 2 Prep...

Page 6: ...device to the electric ground which ground resistance is less than 100 Confirm power source voltage Before connecting this equipment check that the proper voltage is being supplied to the power outle...

Page 7: ...ral definitions of the symbols and indications used in the text and on the product Advises of possible hazard to the user as well as the need to consult this manual when using an operation or function...

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Page 9: ...4 Grounding 2 4 Line filter 2 4 Power source 2 4 Power supply fuse 2 6 2 3 Installation 2 7 Cautions 2 7 Installation conditions 2 7 Panel and case cleaning 2 7 2 4 Conformable standards 2 8 2 5 Cali...

Page 10: ...ection 4 Applications 4 1 4 1 Burst oscillation 4 2 Burst oscillation Type Burst 4 2 Burst oscillation Type Trigger 4 5 Burst oscillation Type Gate 4 9 Burst oscillation Type Triggered Gate 4 13 4 2 S...

Page 11: ...Squarewave pulse width setting 5 4 Amplitude and DC offset setting by high and low level 5 5 5 2 Units 5 7 Engineering unit m k M display 5 7 Amplitude units change 5 8 User unit setting 5 9 5 3 Setti...

Page 12: ...ests 7 5 Preparatory checks 7 5 Test preparation 7 5 Frequency accuracy 7 5 Amplitude accuracy 7 6 DC offset accuracy 7 6 Amplitude vs frequency characteristics 7 7 Sinewave distortion 7 7 Squarewave...

Page 13: ...WF1945B 1 1 Section 1 Overview 1 1 Features 1 2 1 2 Operating principles 1 3 Block diagram 1 3 1 3 Function outline 1 4 Function tree 1 4...

Page 14: ...n is also included z Five standard waveforms sinewave triangular wave squarewave rising sawtooth and descending sawtooth plus arbitrary waveform z Frequency change and frequency sweep are coupled with...

Page 15: ...rence and CPU clock signals z An isolation circuit between the CPU and DDS provides floating functions z The DDS Direct Digital Synthesizer uses an original LSI device and generates digital data of th...

Page 16: ...ng sawtooth descending sawtooth or arbitrary ARB Frequency setting The frequency can be set by the keypad or modify dial The period i e inverse of frequency can also be set The duty and pulse width ca...

Page 17: ...ng Coefficients and compensation can be applied to frequency period amplitude DC offset phase and duty for setting and displaying these in desired units The units can be expressed by up to 4 desired c...

Page 18: ...tinuous gated Sweep objective Frequency amplitude DC offset phase duty Sweep system Linear logarithmic Modulation Modulation type Frequency amplitude DC offset phase duty Modulation waveform Noise DC...

Page 19: ...t phase User units Setting contents Save recall clear Setting initialize Communication GPIB USB Others Error indication Output mode setting at power on Sync out sweep period output Trigger gate sweep...

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Page 21: ...2 Unpacking and repacking 2 2 2 2 Power source and grounding 2 4 Grounding 2 4 Line filter 2 4 Power source 2 4 Power supply fuse 2 6 2 3 Installation 2 7 Cautions 2 7 Installation conditions 2 7 Pan...

Page 22: ...Instruction Manual 1 0105 Arbitrary Waveform Editor CD ROM 1 Supplied accessories Power cable 3 conductors 1 Fuse 100 115 V 1 A or 230 V 0 5 A 1 Time lag 250 V 5 2 20 mm For information on how to use...

Page 23: ...operation cable Cable 1 meter used with the 1991 synchronous operation option The required number of cables is one less than the total number of connected units 1992A digital output option If ordered...

Page 24: ...cable to connect to a 3 terminal power outlet that has a protective ground contact Line filter The WF1945B uses a line filter that incorporates the circuit below Because the maximum leakage current i...

Page 25: ...n the back of the unit 4 Insert the power cable plug into a 3 terminal wall socket With a screwdriver move the slide control of the source voltage change over switch to the line indicating the source...

Page 26: ...specified rating There is risk of fire from an improperly rated fuse Be sure to disconnect the power cable before replacing the fuse Fuse Time lag 1 A 100 115 V or time lag 0 5 A 230 V 250 V 5 2 20 mm...

Page 27: ...to 25 g m3 Ambient storage conditions 10 to 50 C 5 to 95 RH no condensation at an absolute humidity of 1 to 29 g m3 Pollution degree 2 Avoid installing the equipment in the following types of locatio...

Page 28: ...ormance criteria for the following standards are as follows EN61000 4 2 1995 EN61000 4 4 1995 EN61000 4 5 1995 and EN61000 4 11 1994 B The following cables are used for the test of EN 61326 1997 A1 19...

Page 29: ...WF1945B 2 9 2 5 Calibration Section 7 3 the Performance tests are recommended at least once a year These should also be conducted before important tests and measurements...

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Page 31: ...WEEP Z MARKER OUT 3 11 External add input EXT ADD IN 3 11 External AM input EXT AM IN 3 12 Synchronous operation input and output SYNC IN OUT 3 12 Digital output DIGITAL OUT 3 14 3 3 Basic operation 3...

Page 32: ...3 2 WF1945B 3 1 Panel description This section describes the indications and functions of the front and rear panels of the WF1945B...

Page 33: ...on to assist when setting Lamps light to indicate present oscillation mode and waveform selection Lamp lights to indicate output range When the range is set for automatic switching the Auto lamp light...

Page 34: ...exhaust Sync transfer input 1991 option page 3 12 Sync transfer output 1991 option page 3 12 Digital output 1992A option page 3 14 Sweep stop restart input page 3 10 Sweep X drive output page 3 10 Ext...

Page 35: ...add or external AM settings the OVER lamp flashes and the output is clipped 10 V range Approx 11 Vp open 1 V range Approx 1 1 Vp open Output connection note The Function Out impedance is 50 By using c...

Page 36: ...assis Avoid shorting the output or applying an external signal The unit can be damaged Output connection note The Sync Out impedance is 50 By using coaxial cable with 50 characteristic impedance for c...

Page 37: ...is also produced in the FUNCTION OUT waveform Rising and falling edge hysteresis zones vary with phase history Above 100 kHz with stop level off At other times see example below Approximately 25 ns p...

Page 38: ...her times 4 2 Sweep Sweep value and Z MARKER SYNC X DRIVE outputs cf 4 Modulation mode MODU High level when modulation waveform phase is above 0 and less than 180 degrees Low level above 180 and below...

Page 39: ...prox 10 k Ground Connected to chassis ground Do not apply a signal exceeding the above input voltage range The unit can be damaged Drive circuit examples Connect the trigger and sweep input drive sign...

Page 40: ...to chassis ground Do not apply a signal exceeding the above input voltage range The unit can be damaged Sweep X drive output SWEEP X DRIVE OUT Signal characteristics 0 to 5 V sweep increase 5 to 0 V...

Page 41: ...k Ground Connected to chassis ground Avoid shorting the output or applying an external signal The unit can be damaged External add input EXT ADD IN Input voltage 5 V Input impedance 50 External add f...

Page 42: ...m 35 ns per unit Thus phase error of 0 1 degree at approx 8 kHz and 1 degree at approx 80 kHz Description The clock is sent from Master to Slave to Slave The delay per unit is approximately 17 nanosec...

Page 43: ...m any product that will not be used If possible simultaneously switch on all products that are connected by the sync transfer cables If simultaneous switch on is not possible switch on products in suc...

Page 44: ...ulation color Signal Red Signal Red Output control GND Black 3 White D07 GND Black 2 White Signal Red Signal Red D15 MSB GND Black 2 Orange D06 GND Black 4 Orange Signal Red Signal Red D14 GND Black 3...

Page 45: ...ned by terminating at 110 to 120 In this case the amplitude at the load end is about 1 2 that at the output end This response can be utilized to apply a suitable voltage to even a low operating voltag...

Page 46: ...Setting initialize PRESET The operation of initializing all settings is described This instruction manual presumes operation directly after initializing Operation Press the SYSTEM key then use the and...

Page 47: ...en TYPE BURST TRIG SPACE 1 0 When TYPE BURST MODE BURST STOP LEVEL OFF 0 at ON TYPE FREQ SOURCE EXT 1 ms at INT When MODE SINGLE GATED MODE SINGLE FUNCTION LIN TIME 1 s MODE SWEEP STOP LEVEL OFF 0 at...

Page 48: ...ODE MODU TYPE OFSM DEVIATION 0 2 V MODE MODU TYPE PM DEVIATION 90 deg MODE MODU TYPE PWM DEVIATION 20 ENTRY FREQ 1000 Hz ENTRY AMPTD 0 1 Vp p ENTRY OFFSET 0 V ENTRY PHASE 0 deg ENTRY WIDTH 0 0005 s In...

Page 49: ...SE White noise output DC DC output Operation The selected oscillation mode is indicated in the STATUS area which is located to the left of MODE key When the MODE key is pressed the MODE key lamp light...

Page 50: ...elect another waveform one whose key lamp is already lit press the key of the waveform Operation example In this example a triangular waveform is selected Press the FUNCTION key then the key The STATU...

Page 51: ...to suppress the output of multiple pulses in one cycle Therefore set DUTY VALID to CYCLE Note however that this setting cannot be made if the oscillation mode is SWEEP or MODU 3 4 If DUTY VALID is set...

Page 52: ...sible to set CYCLE and EXPAND simultaneously If DUTY VALID is set to IMMED or CYCLE the range in which the duty can be set is 0 0100 to 99 9900 When the frequency is about 4 kHz or less pulse losses c...

Page 53: ...the k key After setting press the EXIT key to exit the setting mode 2 Modify dial This is convenient for continuously setting the frequency Press the ENTRY key then the FREQ key Select the digit to b...

Page 54: ...entry press the BS key before pressing ENTER key This completes setting afterwards press the EXIT key 2 Modify dial The amplitude can be changed continuously Press the ENTRY key then the AMPTD key Se...

Page 55: ...OFFSET key The following display is produced DC offset Frequency Amplitude Press the 1 key then the ENTER key To correct an entry press the BS key before pressing ENTER This completes setting afterwa...

Page 56: ...Press the ENTRY key then the PHASE key The following display is produced Phase Frequency Amplitude Press keys 9 and 0 then the ENTER key To correct an entry press the BS key before pressing ENTER This...

Page 57: ...n WF1945B 3 27 Output on off Output on off setting is described Operation Press the OUTPUT ON OFF key The setting alternates between on and off each time the key is pressed The lamp lights when on ext...

Page 58: ...DC BURST Menu TYPE Burst type BURST TRIG GATE T GATE SOURCE Trigger gate source selection DELAY Trigger delay For TYPE TRIG MARK Number of cycles signal present For TYPE BURST TRIG SPACE Number of cyc...

Page 59: ...TOP LEVEL For MODE GATED CENTER Sweep center value SPAN Sweep width MARKER Marker value MKR CTR Copying of the marker value to the center value START STATE STOP STATE SWEEP Operation START STOP PAUSE...

Page 60: ...itrary waveform SYSTEM Other operation menus RANGE Select output range AUTO 10V 1V PRESET Initialization USER UNIT User unit menu TYPE Setting target FREQ PERIOD AMPTD OFFSET PHASE DUTY NAME Unit name...

Page 61: ...E Save setup memory RECALL Call setup memory CLEAR Clear setup memory LOCAL Release remote state UNDO Cancel setting EXIT Move to menu immediately above ENTER Accept input value Numeric input keypad 0...

Page 62: ......

Page 63: ...ation 4 40 Frequency modulation FM 4 40 Amplitude modulation AM 4 43 DC offset modulation OFSM 4 46 Phase modulation PM 4 49 Pulse width modulation PWM 4 52 4 4 Arbitrary Waveform 4 55 Arbitrary wavef...

Page 64: ...ure In this example the waveform is triangular the DC offset is set to 0 V the oscillation start phase is set to 0 degrees and the frequency and amplitude are set to arbitrarily defined values Operati...

Page 65: ...2 0 cycles After setting press the EXIT key once to exit mark cycle setting 3 Set SPACE cycle Use the and keys to produce the following display SPACE flashes Press the ENTER key Set the space cycles w...

Page 66: ...cle even though the frequency is set to less than 5 MHz If such a shift occurs set the continuous oscillation and then the burst oscillation Stop level off Oscillation stops at the phase set by ENTRY...

Page 67: ...rm output such as indicated in the figure in response to an external trigger The example is a triangular waveform DC offset 0 V frequency and amplitude arbitrary Operation 1 Set the burst oscillation...

Page 68: ...the MODIFY dial to select rising trigger indicates falling trigger After setting press EXIT once to release trigger source setting 3 Set DELAY time Use the and keys to produce the following display D...

Page 69: ...to release mark cycle setting 5 Set STOP LEVEL Use the and keys to produce the following display STOP LEVEL flashes 3 Press the ENTER key Turn the MODIFY dial to produce the following display ON flash...

Page 70: ...he trigger signal is produced at the rate indicated below for oscillation start stop 4 Stop level off Oscillation stops at the phase set by ENTRY PHASE setting mark cycle is integer Manual trigger Pre...

Page 71: ...PHASE phase when oscillation starts deg ENTRY menu Burst oscillation Type Gate MODE BURST TYPE GATE Burst oscillation Type Gate is intermittent with start and stop according to the trigger signal lev...

Page 72: ...then produce the following display with the and keys GATE flashes 4 This sets the burst oscillation type for gate Press the EXIT key once to release the type setting mode 2 Select gate SOURCE Use the...

Page 73: ...amplitude After setting press the EXIT key to release the setting mode The above selects sets burst oscillation type gate Oscillation occurs when a high level signal is applied to the TRIG SWEEP IN c...

Page 74: ...et the trigger source for EXT L ON To generate the trigger signal via remote control GPIB or USB set the GET command or TRG command from the remote control interface Also set the trigger source to EXT...

Page 75: ...form DC offset 0 V oscillation start phase 0 degrees frequency and amplitude arbitrary Stop level 100 0 Trigger signal TRIG SWEEP IN Oscillation starts at trigger Oscillation stops at end of a half cy...

Page 76: ...produce the following display STOP LEVEL flashes Press the ENTER key Turn the MODIFY dial to produce the following display ON flashes Press the key then set the stop level with the keypad or MODIFY di...

Page 77: ...gnal after the oscillation has stopped If oscillation is from an external signal oscillation will not stop even if the MAN TRIG key is pressed Oscillation stops during power on To generate the trigger...

Page 78: ...produce a waveform output with frequency that varies linearly and continuously is described The setting example is a sinewave with arbitrary amplitude and DC offset Operation 1 Set sweep MODE to SING...

Page 79: ...e following display FREQ flashes 4 4 This sets the sweep type for frequency Press the EXIT key once to release the type setting mode 3 Select sweep FUNCTION Use the and keys to produce the following d...

Page 80: ...dial For example set to 100 Hz After setting press the EXIT key once to release the start frequency setting mode 5 Set STOP frequency Use the and keys to produce the following display STOP flashes 3 4...

Page 81: ...operation Sweep starts when the START key is pressed When sweep is started an existing output frequency is quickly changed to the start frequency If desiring to set the start frequency output beforeha...

Page 82: ...power on or a parameter change is 40 ms Otherwise it is 2 ms Power on or a sweep parameter setting change Stop value Dead time 100 ms Start value Trigger Trigger Triggers during dead time are ignored...

Page 83: ...put becomes the respective start and stop states the full scale of the recorder can be adjusted and the state of external equipment can be checked The Start State is the same as pressing the STOP key...

Page 84: ...tinuously frequency The waveform is a sinewave with arbitrary Amplitude and DC offset Start amplitude 1Vp p Stop amplitude 2Vp p Sweep time 2 seconds Operation 1 Set sweep MODE to continuous CONT Pres...

Page 85: ...following display AMPTD flashes 4 4 This completes setting the sweep type to amplitude Press the EXIT key once to release the setting mode 3 Select the sweep FUNCTION Use the and keys to produce the...

Page 86: ...or MODIFY dial For example set to 1 Vp p After setting press the EXIT key once to release the start setting mode 5 Set the STOP amplitude STOP Use the and keys to produce the following display STOP f...

Page 87: ...the start amplitude output beforehand press the STOP key Other operations Sweep stop Press the STOP key This becomes the sweep start value Sweep pause Press the PAUSE key To resume sweep again press t...

Page 88: ...of external equipment can be checked The Start State is the same as pressing the STOP key during single sweep Relation ship between sweep values and sweep auxiliary output 4 2 Sweep Sweep value and Z...

Page 89: ...e a waveform output with frequency that varies in step form and oscillation stops is described The setting example is a sinewave with arbitrary amplitude and DC offset 0 Operation 1 Set sweep MODE to...

Page 90: ...owing display FREQ flashes 4 4 This completes setting the sweep type to frequency Press the EXIT key once to release the setting mode 3 Select the sweep FUNCTION Use the and keys to produce the follow...

Page 91: ...dial For example set to 100 Hz After setting press the EXIT key once to release the start frequency setting mode 5 Set the STOP frequency Use the and keys to produce the following display STOP flashes...

Page 92: ...setting mode 7 Set the STOP LEVEL Use the and keys to produce the following display STOP LEVEL flashes 3 4 Press the ENTER key Turn the MODIFY dial to produce the following display ON flashes 3 4 Pre...

Page 93: ...4 2 Sweep WF1945B 4 31 8 Start sweep Press the START key In this example sweep ends after 3 seconds and oscillation stops Again press the START key to sweep from the stop to the start frequency...

Page 94: ...ct rising or falling Supply an external signal to the front panel TRIG SWEEP IN connector Observe that retrigger is not accepted for 100 ms after sweep start 4 External sweep pause Supply a low level...

Page 95: ...checked 4 2 Sweep Sweep value and Z MARKER SYNC X DRIVE outputs cf Sweep type set to duty Output waveform fixed to squarewave variable duty and waveform Function cannot be selected During sweep multip...

Page 96: ...t that has the log function When start is changed Stop does not change CENTER START STOP 2 SPAN START STOP When stop is changed Start does not change CENTER START STOP 2 SPAN START STOP When center is...

Page 97: ...sweep start value STOP sweep stop value or Sweep range setting CENTER sweep center value SPAN sweep width TIME sweep time s STOP LEVEL Set when the sweep mode is GATED PHASE phase when oscillation sta...

Page 98: ...lation frequency 2 When the waveform is Modulation period 1 Modulation frequency Step number derivation 1 Sweep function is step Step number Sweep time s 10000 raise up even number 1 2 Sweep function...

Page 99: ...ring logarithmic sweep step width log10 1 log10 step no 1 Step width during log sweep changes with step progression The marker output is synchronized with the sweep step output The difference between...

Page 100: ...4 2 Sweep 4 38 WF1945B Sweep value and Z MARKER SYNC X DRIVE outputs is approx 100 to 125 s...

Page 101: ...4 2 Sweep WF1945B 4 39...

Page 102: ...Hz amplitude and DC offset arbitrary Operation 1 Set modulation TYPE to frequency FM Press the MODE key then the MODU key Use the and keys to produce the following display TYPE flashes Press the ENTER...

Page 103: ...press the EXIT key once to exit frequency deviation setting 3 Set the modulation FREQ Use the and keys to produce the following display FREQ flashes Press the ENTER key Set the frequency with the keyp...

Page 104: ...ompletes frequency modulation setting Other operations When the oscillation mode is changed to modulation MODU modulation occurs at the setting at that time point To stop modulation Press the STOP key...

Page 105: ...litude 1 5 Vp p and DC offset 0 V Operation 1 Set modulation TYPE to amplitude AM Press the MODE key then the MODU key Use the and keys to produce the following display TYPE flashes Press the ENTER ke...

Page 106: ...epth For example set to 33 Press the EXIT key once to release the modulation depth setting mode 3 Set the modulation FREQ frequency with varying amplitude Use the and keys to produce the following dis...

Page 107: ...on mode is changed to modulation MODU modulation occurs at the setting at that time point To stop modulation Press the STOP key Resume modulation by pressing the START key Amplitude setting vs maximum...

Page 108: ...e 2 kHz amplitude 1 Vp p and DC offset 0 V Operation 1 Set modulation TYPE to DC offset OFSM Press the MODE key then the MODU key Use the and keys to produce the following display TYPE flashes Press t...

Page 109: ...IFY dial For example set to 0 3 V After setting press the EXIT key once to release the deviation setting mode 3 Set the modulation FREQ Use the and keys to produce the following display FREQ flashes 4...

Page 110: ...ove completes DC offset modulation setting Other operations Amplitude setting vs maximum amplitudes Max amplitude Amplitude setting DC offset deviation When the oscillation mode is changed to modulati...

Page 111: ...DC offset 0 V phase and amplitude arbitrary Operation 1 Set modulation TYPE to phase PM Press the MODE key then the MODU key Use the and keys to produce the following display TYPE flashes Press the E...

Page 112: ...FY dial For example set to 45 degrees After setting press the EXIT key once to exit phase deviation setting 3 Set the modulation FREQ Use the and keys to produce the following display FREQ flashes Pre...

Page 113: ...e EXIT key to release the function setting mode The above completes phase modulation setting Other operations When the oscillation mode is changed to modulation MODU modulation occurs at the setting a...

Page 114: ...Operation 1 Set modulation TYPE to pulse width PWM Press the MODE key then the MODU key Use the and keys to produce the following display TYPE flashes Press the ENTER key then use the and keys to prod...

Page 115: ...Y dial For example set to 80 After setting press the EXIT key once to release the pulse with deviation setting mode 3 Set the modulation FREQ frequency with varying pulse width Use the and keys to pro...

Page 116: ...scillation mode is changed to modulation MODU modulation occurs at the setting at that time point To stop modulation Press the STOP key Resume modulation by pressing the START key Duty setting vs maxi...

Page 117: ...he ARB key 2 Select an arbitrary waveform to be edited output SELECT Press the FUNCTION key then use the and keys to produce the following display SELECT flashes 4 4 Press the ENTRY key then use the a...

Page 118: ...waveform for example sinewave Press the ARB EDIT key then use the and keys to produce the following display COPY flashes 4 Press ENTER key then use the and keys to produce the following display SIN f...

Page 119: ...AD digit flashes 4 Set the waveform address AD with the keypad or MODIFY dial For example set to 1024 Press the m key to produce the following display the asterisk is displayed 4 is interpolation type...

Page 120: ...interpolation between the starred addresses Press the EXIT key then use the and keys to produce the following display MARK CLEAR flashes 3 Press the ENTER key twice to clear the interpolation marks fr...

Page 121: ...o an arbitrary waveform ARB EDIT NAME select ENTER then use the MODIFY dial to select the characters Shift position with and and input Up to 8 characters can be input Following are the usable characte...

Page 122: ...NC OUT waveform After setting press the EXIT key to release the SYNC OUT waveform setting mode When the oscillation mode is BURST STATE Low level during oscillation High level while stopped PHASE For...

Page 123: ...low level while between 180 and 360 degrees Sweeping FUNCTION OUT SYNC OUT SYNC OUT STATE SYNC OUT SYNC OUT PHASE When the oscillation mode is MODU STATE STATE Low level while executing modulation and...

Page 124: ...2 degrees approximately In particular note that when the oscillation mode is switched during a burst or gated sweep while oscillation is stopped the output level may vary or the waveform may become g...

Page 125: ...stepwise variations discontinuities are generated If such discontinuities are removed the remaining variations have the appearance shown below If as an extreme example the oscillation frequency is 1 k...

Page 126: ...ate interval 100 to 252 s If the sweep function FUNCTION is triangular and the change rate of phase is large Output waveform Extra pulses are produced The occurrence frequency when the sweep function...

Page 127: ...es rms of a are equal to those of white noise in the figure b Frequency characteristics of white noise that follows This equivalent bandwidth 500 kHz is called the equivalent noise bandwidth a Frequen...

Page 128: ......

Page 129: ...memory 5 13 Setting store 5 13 Setting recall 5 14 Setting memory clear 5 15 5 4 External Input 5 16 External add EXT ADD 5 16 External AM EXT AM 5 17 5 5 Other settings 5 18 Output range change use w...

Page 130: ...IOD key to produce the following display Set the period with the keypad or MODIFY dial Other The period setting is frequency with the reciprocal less than 0 01 Hz the number should be rounded off Thus...

Page 131: ...width WIDTH Duty DUTY Frequency FREQ Changed Changed Unchanged Period PERIOD Changed Unchanged Changed Pulse width WIDTH Unchanged Unchanged Changed Duty DUTY Unchanged Unchanged Changed Due to the os...

Page 132: ...fects on other parameters when the frequency period width or duty is changed Change Frequency FREQ Period PERIOD Pulse width WIDTH Duty DUTY Frequency FREQ Changed Changed Unchanged Period PERIOD Chan...

Page 133: ...is described Select the waveform type for squarewave Operation Press the ENTRY key then the HIGH key to produce the following display Set the High level with the keypad or MODIFY dial For example set...

Page 134: ...t OFFSET Unchanged Changed Changed High level HIGH Changed Changed Unchanged Low level LOW Changed Changed Unchanged Due to the relationships between high and low level settings relationship between a...

Page 135: ...units e g the k of 1 kHz As an example the frequency units are changed Operation Press the ENTRY key then the FREQ key Press the k key to change the display as follows Other Unit change enable Only wh...

Page 136: ...ghts Turn the MODIFY dial to produce the following display Other The following units can be used Vp p Vrms dBV dBm 1 USER 2 1 Selectable when LOAD function is SET 2 Set User units name is displayed No...

Page 137: ...ion 1 Select setting type for example frequency Press the SYSTEM key then use the and keys to produce the following display USER UNIT flashes 4 Press the ENTER key then use the and keys to produce the...

Page 138: ...y z s p a c e A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 _ After inputting press the EXIT key once to release unit name setting 3 Select the FORMULA for example h n m The...

Page 139: ...scale setting mode 5 Set the offset OFFSET n for example to 0 Use the and keys to produce the following display OFFSET n flashes 3 Press the ENTER key then set the offset with the keypad or MODIFY dia...

Page 140: ...are used When using user units for the DC offset and phase in LOG selection note the following If a negative value is set before the conversion to user units is made an attempt is made to calculate t...

Page 141: ...the memory may also be omitted Select characters with the MODIFY dial and shift position with the and keys Up to 20 characters can be selected from the following list a b c d e f g h i j k l m n o p...

Page 142: ...s In this example TEST 1 is recalled from memory Press ENTER key for recall Other If the keypad is pressed at above step the pressed memory number is recalled Only the stored numbers of the keypad lig...

Page 143: ...he MEMORY key then use the and keys to produce the following display CLEAR flashes Press the ENTER key then use the and keys to produce the following display 0 flashes In this example TEST 1 is cleare...

Page 144: ...1945B output The external signal is connected to the rear panel EXT ADD IN connector Refer to External add input EXT ADD IN on page 28 Operation Press the SYSTEM key then use the and keys to produce t...

Page 145: ...rear panel EXT AM IN connector For details on connectors 3 2 Input and output connectors External add input EXT ADD IN cf Operation Press the SYSTEM key then use the and keys to produce the following...

Page 146: ...output voltage below 2 Vp p open setting resolution is 1 digit less than the 1 V range Operation Press the SYSTEM key then use the and keys to produce the following display RANGE flashes 4 Press the E...

Page 147: ...the power supply was switched off or output on off state The example is setting the output for off at power on Operation Press the SYSTEM key then use the and keys to produce the following display PO...

Page 148: ...and keys to produce the following display LOAD flashes 3 4 Press the ENTER key then turn the MODIFY dial to produce the following display SET flashes 3 4 Press the key then turn the MODIFY dial to set...

Page 149: ...he previous state Operation Press the UNDO to return a setting to the previous state ineffective when UNDO is extinguished Other Undo enabled 1 Directly after changing frequency amplitude etc with the...

Page 150: ...and the Low level to 0 V ENTRY HIGH 5 ENTER ENTRY LOW 0 ENTER Set the period to 2 ms ENTRY PERIOD 2 m Set the pulse width to 0 2 ms ENTRY WIDTH 2 m 2 Use external trigger for pulse output Set the wav...

Page 151: ...TYPE TRIG SOURCE EXT DELAY 0 1 ms MARK 1 0 cycle STOP LEVEL ON 100 Apply the trigger signal to the TRIG SWEEP IN connector Other Double pulse output At above step set MARK 2 0 cycles Manual trigger A...

Page 152: ...it phase 0 degrees 2nd unit phase 90 degrees Operation Press the SYSTEM key then use the and keys to produce the following display SYNC flashes 3 4 Press the ENTER key to engage phase synchronization...

Page 153: ...WF1945B 6 1 Section 6 Troubleshooting 6 1 Error message 6 2 Power on error 6 2 Operation error 6 3 6 2 Suspected failure 6 5 In case of abnormality 6 5...

Page 154: ...error Error message Cause Corrective measures BACKUP MEMORY LOST Battery backup memory contents destroyed Backup battery probably depleted Contact dealer Press the ENTER key to start the system at the...

Page 155: ...nd span exceed the permissible sweep type e g frequency setting range SETTINGS CONFLICT 003 Combined modulation type e g frequency and Deviation or DEPTH exceed the permissible modulation type setting...

Page 156: ...equency burst oscillation mark and space may be unstable WARNING 004 Low level setting changed due to high level setting change or conversely high level setting changed due to low level setting change...

Page 157: ...vice Ambient temperature and humidity outside specified range Use the equipment under the specified environmental conditions Inadequate warm up Allow the equipment to warm up for at least 30 minutes a...

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Page 159: ...s 7 3 Preparatory checks 7 3 Function checks 7 3 7 3 Performance tests 7 5 Performance tests 7 5 Preparatory checks 7 5 Test preparation 7 5 Frequency accuracy 7 5 Amplitude accuracy 7 6 DC offset acc...

Page 160: ...r or dealer regarding more thorough inspection adjustment calibration and repair Do not remove external covers Internal inspection of this equipment must be performed only by a trained service technic...

Page 161: ...g cf If an abnormal indication appears at power on switch power off and wait at least 5 seconds then again switch power on z Main function checks To avoid setting error initialize the settings SYSTEM...

Page 162: ...erature the backup period is typically 3 years but may vary among individual units and usage conditions To prevent any loss of setting information resulting from a depleted battery regular battery rep...

Page 163: ...l RG 58A U or thicker less than 1 meter length and fitted at both ends with BNC connectors z Where items call for 50 termination set the input impedance of the connected instrument to 50 Where this is...

Page 164: ...Vp p open 3 536 Vrms open 3 493 to 3 578 Vrms 10 V 5 Vp p open 1 768 Vrms open 1 738 to 1 798 Vrms 10 V 2 Vp p open 0 707 Vrms open 0 684 to 0 730 Vrms 1 V 2 Vp p open 0 7071 Vrms open 0 699 to 0 716...

Page 165: ...e Waveform 1 kHz Setting to 500 kHz to 1 MHz to 3 MHz to 10 MHz to 15 MHz Reference value 0 2 0 3 dB 0 2 0 3 dB 0 35 0 7 dB 0 5 1 5 dB 0 5 2 0 dB Reference value 0 3 dB Reference value 0 3 dB 0 3 dB R...

Page 166: ...ty factor Connection Use coaxial cable to connect Function Out to a universal counter 50 terminated Settings Initialize the settings then set amplitude to 20 Vp p and waveform and frequency according...

Page 167: ...acteristics 8 2 8 2 Output voltage 8 4 8 3 Other functions 8 5 8 4 Initialized settings 8 10 8 5 Remote control 8 11 8 6 Options 8 12 8 7 General items 8 13 External drawing 8 14 Guaranteed values are...

Page 168: ...z waveform data size words Analog band width 10MHz 0 01 Hz to 500 kHz 0 01 Hz to 15 MHz 0 01 Hz 5 ppm 3 ppm year Frequency equivalent to inverse number of the setting period If the number is less than...

Page 169: ...tive rms value measurement Up to 1 MHz 0 2 dB 0 3 dB 1 MHz to 3 MHz 0 35 dB 0 7 dB 3 MHz to 10 MHz 0 5 dB 1 5 dB 10 MHz to 15 MHz 0 5 dB 2 0 dB Up to 1 MHz 0 3 dB Up to 500 kHz 0 3 dB Up to 500 kHz 0...

Page 170: ...litude setting Vp p 0 01 Vp p open 10 V range 10 000 V open 1 V range 1 0000 V open 10 V range 1 mV open 1 V range 0 1 mV open DC mode External AM off external addition off 10 V range 0 5 of DC offset...

Page 171: ...number at the time of burst Phase from oscillation stop to oscillation start 1800 000 to 1800 000 0 001 Selectable internal trigger oscillator or external trigger input Trigger can be applied from th...

Page 172: ...00 s other times 1 ms Indicates start of single gated sweep 100 ms and more If applying less than 100 ms trigger is at 100 ms intervals Selectable internal trigger oscillator or external trigger input...

Page 173: ...m stop to start 50 unbalanced 45 and more Front panel BNC receptacle SYNC OUT Combined use with SYNC OUT Sweep stop restart input Input level High level 3 9 V low level 1 6 V Signal characteristic Low...

Page 174: ...connector AM on off selectable DC to 10 MHz 3 V input 100 1 V input 0 0 V input 50 of the set amplitude 1 V input the set amplitude 3 V to 1 V 50 Rear panel BNC receptacle EXT AM IN z External add fu...

Page 175: ...at actual voltage for an arbitrary load Conversion formula Output voltage at load Output voltage at no load impedance Load 50 impedance Output impedance Load 45 to 999 1 z Output on off Function Outp...

Page 176: ...ut on off in turning on LAST STATE condition just before power off Setting memory Setting memory comment ALL NOT STORED blank User unit name USER User unit computation formula h n m User unit coeffici...

Page 177: ...service request functions RL1 All remote local functions PP0 No parallel poll functions DC1 All device clear functions DT1 All device trigger functions C0 No controller functions ISO 7 bit codes ASCII...

Page 178: ...ing multiple units of the WF 19 series To connect n units of the WF 19 series n 1 of 1994 synchronous operation cables are necessary z 1992A digital output option Function Data format Output digital s...

Page 179: ...g Forced air cooling rear exhaust z Setup condition Horizontal Within 10 z Environmental conditions Ambient temperature and humidity range Performance guarantee 5 to 35 C 5 to 85 RH no condensation at...

Page 180: ...s 8 14 WF1945B External drawing Surface preparation Front panel Plastic sheet Black4C Frame Painting Metallic gray Cover Polyvinyl chloride metal laminated plate Metallic gray Side view Front panel Re...

Page 181: ...volume LOW 5 5 m 4 57 5 7 M 5 7 MAN TRIG 4 8 4 12 4 15 5 23 MEMORY 5 13 MODE 3 19 4 2 4 16 4 40 MODU 3 8 3 19 4 40 NOISE 3 8 3 19 3 22 3 23 5 8 NORMAL 3 19 5 24 OFFSET 3 25 5 6 5 20 OUTPUT 3 3 3 27 O...

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Page 183: ...t without any charge for the parts and labor or either repair or replace products which prove to be defective For repair service under warranty the product must be returned to a service center designa...

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Page 185: ...e Information provided in this manual is intended to be accurate and reliable However we assume no responsibility for any damage regarding the contents of this manual We assume no responsibility for i...

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Page 188: ...http www nfcorp co jp NF Corporation 6 3 20 Tsunashima higashi Kohoku ku Yokohama 223 8508 JAPAN...

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