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Boonton 1121A, Instruction Manual

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Maintenance 

 

 

 

 

 

 

 

Section 5 

 

5-3 

 

 

 

 
      d.    Turn the instrument over and remove the three 
screws that hold the bottom trim extrusion and remove 
the trim strip.   
 
      e.    Tilt the bottom of the front panel away from the 
instrument until all switches are clear. Pull the front panel 
up to clear the center trim extrusion for access.   
 
      f.    To replace the display/keyboard, reverse the 
removal procedure.   
 

5-12. Plug-in Circuit boards.

 Remove the plug-in circuit 

board as follows:   
 
      a.    Remove the instrument covers as described in 
paragraph 5-10.   
 
      b.    Grasp the circuit board extractors, pull up, and 
slide the circuit board up and out of the instrument.   
 
      c.    To replace circuit boards, reverse the removal 
procedure.   
 

5-13. Optional Filters. 

Install the optional filters as   

follows:   

 

      a.    Remove the instrument top cover as described in 
paragraph 5-10.   
 
      b.    Remove the Filter board (brown extractors). Re 
fer to paragraph 5-12. Place the board on a flat working   
surface with the components up and the extractors at the 
top.   

 

 
 

 
 

Summary of Contents for 1121A

Page 1: ... MODEL 1121A PROGRAMMABLE AUDIO ANALYZER REV DATE 05 16 MANUAL P N 98407600A Wireless Telecom Group 25 EASTMANS ROAD PARSIPPANY NJ 07054 Telephone 973 386 9696 Fax 973 386 9191 Email boonton boonton com Web www wtcom com ...

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Page 3: ...JUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Do not install substitute parts or perform any unauthorized modification of the instrument Return the instrument to Boonton Electronics for repair to ensure that the safety features are maintained SAFETY SYMBOLS This...

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Page 5: ...ion 3 1 3 11 Data Entry Operation 3 1 3 13 Analyzer Measurement Description 3 6 3 14 Analyzer Input Description 3 6 3 15 Frequency Measurement Function 3 6 3 16 Frequency Measurement Display Units 3 6 3 17 Special Frequency Measurement Modes 3 6 3 18 Level Measurement Function 3 6 3 19 Level Measurement Display Units 3 6 3 20 Special Level Measurement Modes 3 6 3 21 Distortion Measurement Function...

Page 6: ...nerating Level Sweeps 3 13 3 58 Program Store and Recall Description 3 13 3 59 Store Operation 3 13 3 60 Recall Operation 3 13 3 61 Program Memory Initialization 3 13 3 62 Special Function Description 3 13 3 63 Option Switch Functions 3 13 3 64 Mode Alteration Function 3 14 3 70 Calibration and Test Functions 3 18 3 71 S N Delay Functions 3 18 3 72 Frequency Sweep Resolution Functions 3 18 3 73 Sw...

Page 7: ... Source Circuits 4 13 4 76 A7 Output Circuits 4 14 SECTION V MAINTENANCE 5 1 INTRODUCTION 5 1 5 3 SAFETY REQUIREMENTS 5 1 5 5 REQUIRED TEST EQUIPMENT 5 1 5 7 CLEANING PROCEDURE 5 1 5 9 REMOVAL AND REPLACEMENT 5 1 5 10 Instrument Covers 5 1 5 11 Display Keyboard Access 5 1 5 12 Plug in Circuit Board 5 3 5 13 Optional Filters 5 3 5 14 Firmware Integrated Circuit 5 4 5 15 Component Removal 5 4 5 16 I...

Page 8: ...ents 5 24 5 60 A0 Input Board Adjustments 5 24 5 62 A0R29 A0R12 A0R7 and A0C35 CMRR Adjustments 5 24 5 63 A0C5 and A0C32 Flatness Adjustments 5 25 5 64 A0C10 and A0C33 Flatness Adjustments 5 25 5 65 A7 Output Board Adjustments 5 25 5 66 A7R21 A7R17 and A7R15 Adjustments 5 25 5 67 A6 Source Board Adjustments 5 25 5 68 A5R23 Output Level Adjustment 5 25 5 69 A37 CCIR CCIR ARM Filter Board Adjustment...

Page 9: ...BLE 5 5 ANALYZER AC LEVEL FLATNESS TEST RECORD 5 12 TABLE 5 6 SOURCE IMPEDANCE ACCURACY TEST RECORD 5 13 TABLE 5 7 SOURCE LEVEL ACCURACY TEST RECORD 5 13 TABLE 5 8 SOURCE LEVEL FLATNESS TEST RECORD 5 13 TABLE 5 9 ANALYZER LOW LEVEL AC ACCURACY TEST RECORD 5 14 TABLE 5 10 SOURCE FREQUENCY ACCURACY TEST RECORD 5 14 TABLE 5 11 ANALYZER FREQUENCY ACCURACY TEST RECORD 5 14 TABLE 5 12 FILTER ACCURACY TE...

Page 10: ... 6 4 PWA 1121A Main Filter A1 6 10 Figure 6 5 PWA 1121A Notch A2 6 12 Figure 6 6 PWA 1121A Detector A3 6 15 Figure 6 7 PWA 1121A Freq Counter A4 6 18 Figure 6 8 PWA 1121A CPU A5 6 21 Figure 6 9 PWA 1121A Source A6 6 23 Figure 6 10 PWA 1121A Output A7 6 26 Figure 6 11 Front Panel Assy A17 6 29 Figure 6 12 PWA 1121A Keyboard A13 6 30 Figure 6 13 Sub Panel Assy A23 6 32 Figure 6 14 PWA 1121A Display ...

Page 11: ... Figure 7 25 Power Supply A11 2 Schematic 7 31 Figure 7 26 Display Board A12 Parts Location Diagram 7 32 Figure 7 27 Display Board A12 Schematic Sheet 1 7 33 Figure 7 28 Key Board A13 Parts Location Diagram 7 34 Figure 7 29 Key Board A13 Schematic 7 35 Figure 7 30 Amplifier Board A24 Parts Location Diagram 7 36 Figure 7 31 Amplifier Board A24 Schematic 7 36 Figure 7 32 400 Hz Board A1A30 Parts Loc...

Page 12: ...VIII MODEL 1121A AUDIO ANALYZER ...

Page 13: ...unctions The Model 1121A has 3 separate display windows to simultaneously present analyzer measurements source settings and program number or bus address information Continuous display of IEEE 488 bus status is also presented f Full Range of Filter Selections The Model 1121A provides a wide range of filter selections and weighting characteristics for industry standard audio measurements g Sweep Op...

Page 14: ...ECIFICATIONS Frequency Measurement Range 5 Hz to 200 kHz Sensitivity 5 mV in the Frequency mode 50 mV in the Distortion and SINAD modes Accuracy Timebase accuracy 1 count Distortion Residual Distortion and Noise the greater of 80 dB or 10 µV 10 Hz to 20 kHz 80 kHz BW 74 dB or 20 µV 10 Hz to 50 kHz 220 kHz BW 70 dB or 40 µV 10 Hz to 50 kHz 500 kHz BW 65 dB or 40 µV 50 to 100 kHz 500 kHz BW Flatness...

Page 15: ...o 20 kHz 2 dB 10 Hz to 100 kHz Input Voltage Range 50 mV to 300 V Distortion Measurement Range 10 Hz to 20 kHz 80 kHz bandwidth 0 056 65 dB 100 mV to 200 mV Input Voltage Range 0 032 70 dB 200 mV to 350 mV Input Voltage Range 0 010 80 dB 350 mV to 300 V Input Voltage Range 10 Hz to 50 kHz 220 kHz bandwidth 0 056 65 dB 100 mV to 200 mV Input Voltage Range 0 020 74 dB 200 mV to 300 V Input Voltage R...

Page 16: ...alyzer Measurement Speed Frequency Measurement Technique Reciprocal measurement with 10 MHz timebase Physical and Environmental Specifications General Manufactured to the intent of MIL T 28800E Type III Class 5 Style E Power Requirements 100 120 220 240 volts AC 10 50 to 400 Hz 80 VA CCITT or C MESSAGE Band pass Filter 0 2 dB 800 Hz CCITT 0 2 dB 1000 Hz C MESSAGE 1 0 dB 300 to 3000 Hz 2 0 dB 50 to...

Page 17: ...nd pass filter Remote Interface IEEE 488 1978 Implements AH1 SH1 T6 TE0 L4 LE0 SR1 RL1 PP0 DC1 DT1 C0 and E1 Ventilation Requirements 1 1 2 inch clearance after installation top side rear Temperature Non Operating 40 to 75 degrees C AltitudeOperating 10 000 Ft EEC Humidity and 95 non condensing Battery Type Refer to page 6 12 CE MARK Declares Conformity to European Community EC Council Directives ...

Page 18: ...Section 1 General Information 1 6 This page intentionally blank ...

Page 19: ...T Analyzer Input HIGH and LOW BNC type connectors and chassis ground allow connection of ex ternal audio signals for analysis The input impedance is 100 k ohms either side to ground The LOW terminal is connected to chassis ground in the non floating mode OUTPUT Source output HIGH and LOW BNC type connectors and chassis ground allow connection to ex ternal devices and components The output impedanc...

Page 20: ...nitialized values and conditions listed in Table 2 1 TABLE 2 1 INITIAL CONDITIONS Analyzer Group Source Group Sweep Group Bus Prgm Group LEVEL function enabled KYBD legend illuminated SWEEP disabled ADRS is unchanged Linear display units FREQ function enabled START set to 20 000 Hz PRGM is set to 99 RATIO mode disabled FREQ set to 1000 00 Hz STOP set to 20 000 kHz SRQ is cleared Filters disabled F...

Page 21: ...Installation Section 2 2 3 Figure 2 1 Packing and Unpacking Diagram ...

Page 22: ...Section 2 Installation 2 4 This page intentionally blank ...

Page 23: ...sible reasons 1 The first measurement cycle is in progress and cannot be displayed 2 The measurements minimum signal require ments are not met for example frequency measure ments cannot be made if the input level is too low 3 The input level is overrange 4 The input signal is changing faster than the analyzer can respond 5 The notch filter is in the process of being tuned to the fundament frequenc...

Page 24: ...Section 3 Operation 3 2 Figure 3 1 Model 1121A Front View Figure 3 2 Model 1121A Rear View ...

Page 25: ...Operation Section 3 3 3 ...

Page 26: ...Section 3 Operation 3 4 ...

Page 27: ...Operation Section 3 3 5 ...

Page 28: ... the period of the dominant AC component of the input signal This technique yields fast settled measurements in the AC level mode while effectively filtering large AC com ponents in the DC level mode Measurement bandwidth is selectable using the standard and optional filters to reject out of band noise or provide industry standard weighting characteristics 3 19 Level Measurement Display Units AC a...

Page 29: ...tion the frequency of the displayed in Hz or kHz units To select the distortion measurement function simply depress the DIST key which illuminates both the key s LED and the KYBD legend in the ANALYZER display The various display modes can then be selected by depressing the the appropriate units associated with the desired display mode For example to select distortion level in logarith mic units d...

Page 30: ...Section 3 Operation 3 8 ...

Page 31: ...terminate and causes the to be displayed Special function 15 is designed to disable the message in this circumstance As with all amplitude measurement functions the rms average or quasi peak detector type can be selected using special function 70 71 or 72 respectively 3 27 S N Measurement Function The Model 1121A measures S N signal to noise by alternately turning the source output on and off and ...

Page 32: ...ilter is recommended The DC low pass filter is provided to attenuate all AC components and measure DC level directly The DC low pass filter can only be activated in the analyzer level mode Band pass filters are combina tions of high and low pass filters and are used in some measurements to simulate the sensitivity of the human ear to the audible frequency spectrum High pass filter selection is use...

Page 33: ...djustments are made by the control program to tune the oscillator to within tolerance Special function 16 disables the frequency lock mode to enable faster frequency updates and sweep rates where the full frequency accuracy of the oscillator is not required 3 40 Source level Display and Selection To select the Level function simply depress the LEVEL key The key s LED and the KYBD legend will be il...

Page 34: ... of one sweep 3 48 START Key Description The START key allows entry of either the frequency or level START value The START value defines the origin of the X axis which corresponds to 0 volts at the X AXIS output connector When the START key is depressed the SOURCE display will contain the START value and 0 volts is presented at the X AXIS output connector as an aid in setting the offset adjustment...

Page 35: ... effect on level sweep A logarithmic level sweep is defined by a LEVEL STEP value expressed in dB units and a linear level sweep is defined by a LEVEL STEP value expressed in mV or V units Level sweep step sizes which exceed the X axis resolution limit of 4096 steps are allowed however the X AXIS output voltage will dwell at the same level for more than one level increment 3 58 Program Store And R...

Page 36: ...ble notch filter to attenuate selected tones other than the fundamental These special modes can be activated by entering the special code or by selecting the analyzer distortion mode and entering the notch frequency directly into the ANALYZER display window using the DATA ENTRY keypad Direct entry of the notch frequency will automatically select Special 14 and the SPCL legend will be illuminated N...

Page 37: ...Operation Section 3 3 15 TABLE 3 9 ERROR CODES ...

Page 38: ...Section 3 Operation 3 16 TABLE 3 8 OPTION SWITCH A4S1 ...

Page 39: ...Operation Section 3 3 17 TABLE 3 9 ERROR CODES ...

Page 40: ...fy EOI is always recognized and asserted in addition to the EOS characters selected Position 3 determines the pen up active state of the PEN output on the rear panel Position 4 is available to restrict the use of special functions 20 through 39 These special functions are associated with calibration and repair of the instrument Position 5 determines the operation of the IEEE 488 SRQ function When ...

Page 41: ...Operation Section 3 3 19 ...

Page 42: ...Section 3 Operation 3 20 ...

Page 43: ... the instrument 3 88 Talk Value TV Mode In the TV mode the ar gument of the active function designated by the KYBD annunciator is returned as a number All values returned are in basic units such as Hz V dB etc 3 89 Talk Program TP Mode In the TP mode a 10 digit number is returned that uniquely identifies the firm ware and installed optional filters A radix separates the firmware date code and the ...

Page 44: ...since the identity of the requesting device is known The error code may be obtained directly from the talk status TS mode The SRQ line can then be cleared by sending the clear CL command 3 95 Bus Command Responses IEEE 488 bus com mands are sent by the controller to all devices on the bus Universal Command Group or to addressed devices only Addressed Command Group The response of the instrument is...

Page 45: ...g Errors Errors are detected during interpretation The occurrence of an error will display the error code if the display is enabled and will set SRQ true if enabled The error and SRQ can be cleared by a serial poll a status request TS or a clear error instruction CL All errors cause previous valid parameters to be restored No new input can be processed until an existing error is cleared 3 100 Data...

Page 46: ...Section 3 Operation 3 24 This page intentionally blank ...

Page 47: ...ues are displayed on an alphanumeric display and LED indicators Input com mands are processed by the internal microprocessor and control signals are developed to configure the internal circuits in accordance with the commands The use of the microprocessor also enables the storage of up to 99 complete sets of instrument setup data Commonly used setups can be entered into non volatile memory either ...

Page 48: ...ts and provides amplification over a range of X1 to X10000 in X1 X2 or X5 increments The amplifier is used in conjunction with the input amplifier in the AC level and S N measurement modes to provide extended range from 300mV down to 0 3 mV full scale In the distortion and SINAD measurement modes the amplifier is used in conjunction with the notch amplifier to boost harmonic and noise content in t...

Page 49: ...ers the connections to the primaries of T1 and T2 allowing the Model 1121A to operate from line voltages of 100 to 240 volts The dual power supplies provide fixed and floating sources of 5 15 and 15 volts The fixed and floating supplies are essentially identical therefore only one will be described in detail 4 17 One of the two secondary windings on T1 is con nected through full wave bridge CR1 to...

Page 50: ...Section 4 Theory of Operation 4 4 Figure 4 3 CPU Circuits Block Diagram ...

Page 51: ... board generates the Master Analyzer Enable MAE signal which enables address decoder U1 and tri state buffer U2 MAE is only active during instrument data write cycles to the analyzer circuits and inhibits RF generated noise caused by the many data transfers between the CPU and counter plug in boards The instrument data lines to the source and output plug in boards are buffered in the same manner w...

Page 52: ...rough U2a and is used for the internal timebase reference for the frequency counter circuits 4 27 All IEEE 488 interface operations are conducted by U16 in conjunction with the microprocessor interrupt routines These routines move data into and out of mem ory buffers as required in response to bus commands U17 and U18 are buffer circuits which connect U16 to the IEEE 488 bus via J20 These buffers ...

Page 53: ...and U3d The output of U3b TP2 is the reference frequency for the counter circuits derived from either the internal or external source DS2 will be illuminated when the external reference is active 4 37 The analyzer frequency line ANFRQ is generated on the detector plug in board and is applied to hysteresis amplifier U1a and associated components U1a acts as a buffer between the analog and digital s...

Page 54: ...ice U13 pin 10 Reverse power protection is provided by R12 CR4 and CR5 The X AXIS and Y AXIS outputs are generated by dual 12 bit digital to analog converter D A U19 and associated voltage amplifiers U18a and b The 5 volt reference voltage for the D A converter is zener regulated from the 15 volt supply by R24 and CR14 and filtered by C13 Reverse power protection is provided by R25 R26 and CR6 thr...

Page 55: ... and resistors R25 through R29 from the differential to single ended converter stage of the instrumentation amplifier R29 enables the adjustment of the common mode rejection of the stage 4 49 The common mode TP4 and differential TP6 signals are separately monitored by window detectors U6a through d for peak voltages exceeding 10 volts The common mode signal is formed by summing the outputs of U5 a...

Page 56: ...arators contained in U6 U7 and U8 and associated pull up resistors R29 and R30 act as level translators to convey the latched TTL data to gate drive levels necessary to operate the FET switches 4 58 The band pass filter output is generated at the output of inverting amplifier U2a TP3 Balance amplifier U3a subtracts the band pass output from the filter input signal forming a notch filter response T...

Page 57: ...4 8 4 62 Relay K1 is selected by the control program to insert the notch filter into the signal path in the distortion and SINAD measurement modes In all other modes the filter is bypassed Analog switch U2 with resistors R5 R6 and R7 form a programmable attenuator with 0 dB or 20 dB of attenuation This attenuator is followed by amplifier U3 having a gain of 20 dB determined by R8 and R9 The attenu...

Page 58: ... modes the 20 dB amplifier on the notch filter plug in board increases the chain to a total combined gain of 80 dB The programmable gain is required to maintain a constant level of between 1 2 and 3 volts at the rms average and quasi peak detectors to preserve the resolution and accuracy of the analyzer over a wide dynamic range The rms detector consists of U18 and associated components The output...

Page 59: ...tors are selected for frequency tuning within a selected frequency band by FET switches Q18 through Q25 Capacitors C18 through C22 are selected by FET switches Q14 through Q17 for integrator tuning over five frequency bands Integrating amplifier U12b completes the integrator TP1 Coarse tuning of the oscillator is provided by the selection of resistor and capacitor com binations by the control prog...

Page 60: ... the oscillator through U12a The ALC control loop can be disabled to aid in troubleshooting the oscillator circuits by removing U10 In this design the ALC control loop operates to reduce oscillation therefore removing U10 causes the oscillator level to increase to the limit set by the limiter circuits controlling U12b The oscillator and ALC circuits can then be investigated individually 4 76 A7 Ou...

Page 61: ...ormed by R37 C24 and U9c The one second delay provides time for the CPU to initialize the source circuits When power is applied C24 charges through R37 to 5 volts Comparator U9c detects at the 1 8 volt level and turns Q1 on The emitter of Q1 drives Q8 on the motherboard supplying 15 volts to relays K1 through K5 ...

Page 62: ...Section 4 Theory of Operation 4 16 This page intentionally blank ...

Page 63: ...are based on the assumption that the recommended test equipment is used 5 7 CLEANING PROCEDURE 5 8 Painted surfaces can be cleaned with a commer cial spray type window cleaner or with a mild soap and water solution Avoid the use of chemical cleaning agents which might damage the plastics used in the instrument Recommended cleaning agents are isopropyl alcohol a solution of 1 part kelite and 20 par...

Page 64: ...Section 5 Maintenance 5 2 ...

Page 65: ...ug in Circuit boards Remove the plug in circuit board as follows a Remove the instrument covers as described in paragraph 5 10 b Grasp the circuit board extractors pull up and slide the circuit board up and out of the instrument c To replace circuit boards reverse the removal procedure 5 13 Optional Filters Install the optional filters as follows a Remove the instrument top cover as described in p...

Page 66: ...te EPROM A5U14 Remove the IC with a straight pull away from the board d EPROM is a replaceable part and does not require reprogramming Install the replacement IC and replace the circuit board There are voltages at various points in the instrument which can if contacted cause personal injury Observe all safety precautions Service and adjustments should be performed by trained service personnel only...

Page 67: ...ncy and level listed in Table 5 2 designated for the filter to be calibrated and enable the Calibrator output g Enter the special function that corresponds to the filter position to be calibrated Special function 21 will calibrate the optional filter No 1 installed in the left most position while special function 22 calibrates optional filter No 2 installed in the right most position The SOURCE di...

Page 68: ...a and record ZOUT in Table 5 6 Zout 100 15 DISP 1 149 8 j Disable the ratio mode and remove the 150 ohm load k Enter special function 75 50 ohm output l Depress the RATIO key to enable the ratio mode m Connect the 50 ohm load across the binding post adapters at the input of the Analyzer Zout 100 05 DISP 1 49 98 n Note the display and calculate the output im pedance using the following formula and ...

Page 69: ...e actual flatness by subtracting the value in the REFERENCE column in Table 5 8 from the displayed measurement and record the result in the ACTUAL column At the 140 kHz test frequency subtract the 100 kHz value in the REFERENCE column from the displayed measurement and record the result 5 31 Analyzer Low Level AC Accuracy Depress the LCL INIT key to initialize the instrument Enter special function...

Page 70: ...test the Source is connected to the Analyzer and the residual signal to noise is measured at various frequencies and levels Due to the synchronous nature of the measure ment only the Source and Analyzer of the same instru ment may be used together 5 40 Depress the LCL INIT key to initialize the instru ment and enter special function 75 50 ohm output Connect the source HI and LOW outputs using the ...

Page 71: ...Maintenance Section 5 5 9 TABLE 5 3 ANALYZER DC LEVEL ACCURACY TEST RECORD ...

Page 72: ...lts b Enable the Analyzer level ratio mode and de press the dB key c Enter special function 12 to hold the 1 5 volt input range and special function 71 to select the average detector d Enable the CCIR band pass filter and set the Source to the frequencies listed in Table 5 16 and record the results pass or fail 5 47 CCIR Filter Accuracy Refer to paragraph 5 43 for the test connections and perform ...

Page 73: ...Maintenance Section 5 5 11 TABLE 5 4 ANALYZER AC LEVEL ACCURACY TEST RECORD ...

Page 74: ...Section 5 Maintenance 5 12 TABLE 5 5 ANALYZER AC LEVEL FLATNESS TEST RECORD ...

Page 75: ...Maintenance Section 5 5 13 TABLE 5 7 SOURCE LEVEL ACCURACY TEST RECORD TABLE 5 8 SOURCE LEVEL FLATNESS TEST RECORD ...

Page 76: ...Section 5 Maintenance 5 14 TABLE 5 9 SOURCE LOW LEVEL ACCURACY TEST RECORD ...

Page 77: ...Maintenance Section 5 5 15 TABLE 5 12 FILTER ACCURACY TEST RECORD ...

Page 78: ...Section 5 Maintenance 5 16 TABLE 5 14 RESIDUAL SIGNAL TO NOISE TEST RECORD ...

Page 79: ...Maintenance Section 5 5 17 ...

Page 80: ...Section 5 Maintenance 5 18 TABLE 5 17 CCIR FILTER ACCURACY TEST RECORD ...

Page 81: ...Maintenance Section 5 5 19 TABLE 5 18 A WEIGHTING FILTER ACCURACY TEST RECORD ...

Page 82: ...Section 5 Maintenance 5 20 ...

Page 83: ...Maintenance Section 5 5 21 ...

Page 84: ...Section 5 Maintenance 5 22 ...

Page 85: ...io Analyzer and remove the top cover b Set the rear panel line voltage switch to the appropriate voltage c Verify that the line fuse is the proper value as listed on the LINE VOLTAGE SELECT chart located on the rear panel d Connect the variac to an appropriate power source and adjust for a line indication of nominal 10 90 108 200 or 216 volts There are voltages at various points in the instrument ...

Page 86: ...OFF e Set the Source level to 3 000 volts and depress the Analyzer DIST key f Observe the Wave Analyzer and alternately adjust A3R46 and A3R49 for a minimum indication The null measurement should be in excess of 40 dB 5 60 A0 Input Board Adjustments 5 61 The Input Board adjustments consist of four com mon mode rejection adjustments A0R29 and A0C35 3 V Range CMRR A0R12 30 V Range CMRR and A0R7300 V...

Page 87: ...on of 100 00 0 1 g Enter special function 26 note the display and adjust A0C33 for an indication of 100 00 0 1 5 65 A7 Output Board Adjustments The Output Board adjustments consist of three attenuator adjustments which trim the most significant bits of the programmable attenuator for optimum level accuracy 5 66 A7R21 A7R17 and A7R15 Adjustments Perform the adjustments as follows a Depress the LCL ...

Page 88: ... and performance out of specifi cation are usually limited to one section of the instrument and will be evident from manipulation of the front panel controls For example incorrect or erratic distortion measurements will indicate a fault in the notch filter circuits on the Notch Filter plug in board Further isolation of the problem requires an understanding of the simplified block diagrams detailed...

Page 89: ...Notch and Detector plug in boards can be tested using special function 33 In this test sequence an external signal source set to 1 kHz and 3 000 volts is applied to the Analyzer input Each of the 13 post notch detector ranges is sequentially checked to an accuracy limit of 1 0 while the ANALYZER display indicates the range being tested The SOURCE display will indicate an error code if a fault is e...

Page 90: ...Section 5 Maintenance 5 28 TABLE 5 23 DIAGNOSTIC ERROR CODE DESCRIPTION ...

Page 91: ...cs Inc 0MJ08 Linear Integrated Systems Inc 5L401 Solid State Inc 12060 Diodes Incorporated 61429 Fox Electronics 13454 Crystek Crystals Corporation 61935 Schurter Inc 13919 Burr Brown Corp 64155 Linear Technology 14655 Cornell Dublier 64667 National Instruments 15542 Mini Circuits Labs 65238 Novacap Inc 17856 Siliconix Inc 65786 Cypress Semiconductor 1D3Q0 CTS Corporation 65VR8 Macronix America In...

Page 92: ...Section 6 Parts List 6 2 Figure 6 1 Model 1121A Programmable Audio Analyzer ...

Page 93: ...Parts List Section 6 6 3 ...

Page 94: ...Section 6 Parts List 6 4 Figure 6 2 1121A Frame Assy Sheet 1 of 2 ...

Page 95: ...Parts List Section 6 6 5 Figure 6 2 1121A Frame Assy Sheet 2 of 2 ...

Page 96: ...11103202B A22 FRAME ASSY 1121A 04901 11220200A 1 11220200A 11220200A REV A FRAME ASSY 1121A A22 Figure 6 2 MODEL 1121A REF CAGE MFG PART BEC PART DESIG DESCRIPTION CODE NUMBER QTY NUMBER A17 BEZEL ASSEMBLY 1121A 04901 11220300A 1 11220300A A21 REAR PANEL ASSY 1121A 04901 11220700A 1 11220700A W21 CABLE ASSY FLAT 26 CKT 15 LONG 04901 92019700A 1 92019700A W46 CABLE ASSY COAX GRN 9 875L 04901 572248...

Page 97: ...Parts List Section 6 6 7 Figure 6 3 PWA 1121A Input A0 ...

Page 98: ...07263 MMSZ5230B 2 53102700A F1 2 FUSE 1 4A 0 25A 250V 71400 AGC 1 4 2 54550600A J19 CONN M 4 PIN POLARIZED HEADER 156 SP 06383 MPSS156 4 D A 1 477344000 K1 2 RELAY SPST REED FORM A SM C0491 CRR05 1A 2 47200400A K3 9 RELAY FORM C 12V SM 61529 TQ2SA 12V 7 47107200A L1 2 INDUCTOR 5 6UH 341MA 1210 99800 1210 562K 2 40049300A L3 4 FERRITE BEADS 34899 2643000101 2 483247000 Q1 6 TRANSISTOR NPN 3904 SOT ...

Page 99: ...B RES CHIP 1 30M 0 1 1 2W 2512 4S177 TPI 2512 1304B 2 32261102A U1 IC SN74LS74 DUAL D TYPE FLIP FLOP SOIC 14 01295 SN74LS74AD 1 53706200A U2 IC SN74LS273 OCTAL D FLIP FLOP SOIC 20 01295 SN74LS273DW 1 53705400A U3 IC MC7805 POS VOLTAGE REG 1A D2PAK 3 1MQ07 MC7805ABD2TG 1 53806800A U4 IC SW06 QUAD SPST JFET ANALOG SWITCH 51640 SW06GSZ 1 53807600A U5 IC NE5534 LOW NOISE OP AMP SOIC 8 01295 NE5534D 1 ...

Page 100: ...Section 6 Parts List 6 10 Figure 6 4 PWA 1121A Main Filter A1 ...

Page 101: ...K3RACTU 1 20900600A C18 CAP CER CHIP 0 1uF 10 50V 0805 31433 C0805C104K5RAC 1 20900500A L1 2 INDUCTOR CHIP 5 6uH 5 341mA 1210 99800 1210R 562J 2 42002700A R1 RES CHIP 4 02K 1 1 8W 0805 4S177 RCI 0805 4021F 1 31835800A R2 RES CHIP 3 010K 0 1 1 8W 0805 4S177 TPI 0805 3011B 1 31834602A R3 RES CHIP 1 000K 0 1 1 8W 0805 4S177 TPI 0805 1001B 1 31830002A R4 5 RES CHIP 499 OHMS 0 1 1 8W 0805 4S177 TPI 080...

Page 102: ...Section 6 Parts List 6 12 Figure 6 5 PWA 1121A Notch A2 ...

Page 103: ...pF 5 50V 0603 31433 C0603C200J5GAC 1 20802900A CR1 6 DIODE MMBD914 SOT 23 1MQ07 MMBD914LT1G 6 53100000A J1 CONN M 3 PIN SINGLE ROW HEADER 10 SP 55322 TSM 103 02 L SV 1 49200603A L1 2 INDUCTOR 5 6UH 341MA 1210 99800 1210 562K 2 40049300A P1 SHUNT 2 CIRCUIT RoHS 27264 15 38 1024 1 483253000 Q1 24 TRANS N CHANNEL SWITCH MMBFJ108 SOT 3 07263 MMBFJ108 24 52902500A Q25 26 TRANSISTOR JFET N CH SOT 23 1MQ...

Page 104: ...5 4S177 RCI 0805 4992F 2 31846700A R61 RES CHIP 60 4K 1 1 8W 0805 4S177 RCI 0805 6042F 1 31847500A R66 RES CHIP 75K 1 1 8W 0805 4S177 RCI 0805 7502F 1 31848400A R67 68 RES CHIP 49 9K 1 1 8W 0805 4S177 RCI 0805 4992F 2 31846700A R69 70 RES CHIP 33 2K 1 1 8W 0805 4S177 RCI 0805 3322F 2 31845000A R71 RES CHIP 20 0K 1 1 8W 0805 4S177 RCI 0805 2002F 1 31842900A R72 RES CHIP 49 9K 1 1 8W 0805 4S177 RCI ...

Page 105: ...Parts List Section 6 6 15 Figure 6 6 PWA 1121A Detector A3 ...

Page 106: ...LM CHIP 0 22uF 2 50V 54473 ECHU1H224GX9 2 23800100A C52 CAP ELEC 100uF 20 25V SM SIZE F 54473 EEE 1EA101P 1 28339300A C53 CAP TANT CHIP 68uF 20 25V EIA 7343 43 31433 B45025E6869M137 1 24001100A C54 CAP TANT CHIP 100uF 10 20V SM 7343 31433 T491D107K020AT 1 24001500A C56 CAP TANT CHIP 4 7uF 10 20V EIA 3528 21 31433 T491B475K020AT 1 24000100A C57 CAP PLASTIC FILM CHIP 1 0uF 10 100V 54473 ECWU1105KCV ...

Page 107: ...830000A R42 RES CHIP 105K 1 1 8W 0805 4S177 RCI 0805 1053F 1 31850200A R43 44 RES CHIP 1 00K 1 1 8W 0805 4S177 RCI 0805 1001F 2 31830000A R45 RES CHIP 374K 1 1 8W 0805 4S177 RCI 0805 3743F 1 31855500A R46 RES CHIP 17 8K 1 1 8W 0805 4S177 RCI 0805 1782F 1 31842400A R47 RES CHIP 2 74K 1 1 8W 0805 4S177 RCI 0805 2741F 1 31834200A R48 RES CHIP 4 99K 1 1 8W 0805 4S177 RCI 0805 4991F 1 31836700A R49 RES...

Page 108: ... LM393M 1 53806900A U14 IC SN74LS00 2 INPUT POSITIVE NAND GATE 01295 SN74LS00D 1 53705500A U15 IC OPA2107 PRECISION DUAL OP AMP SO 8 01295 OPA2107AU 1 53807700A U16 IC TL072A LOW NOISE OP AMP SOIC 8 01295 TL072ACD 1 53805000A U17 IC NE5534 LOW NOISE OP AMP SOIC 8 01295 NE5534D 1 53806400A U18 IC AD637 WIDEBAND RMS TO DC CONVERTER 51640 AD637JRZ 1 53806700A U19 20 IC TL072A LOW NOISE OP AMP SOIC 8 ...

Page 109: ...Parts List Section 6 6 19 Figure 6 7 PWA 1121A Freq Counter ...

Page 110: ... 8W 0805 4S177 RCI 0805 3011F 1 31834600A R6 7 RES CHIP 10 0K 1 1 8W 0805 4S177 RCI 0805 1002F 2 31840000A R8 10 RES CHIP 1 00K 1 1 8W 0805 4S177 RCI 0805 1001F 3 31830000A R11 12 RES CHIP 10 0K 1 1 8W 0805 4S177 RCI 0805 1002F 2 31840000A R13 R14A H RES CHIP 3 01K 1 1 8W 0805 4S177 RCI 0805 3011F 9 31834600A R14J R RES CHIP 6 19K 1 1 8W 0805 4S177 RCI 0805 6191F 9 31837600A R24 RES CHIP 475 OHMS ...

Page 111: ...Parts List Section 6 6 21 Figure 6 8 PWA 1121A CPU A5 ...

Page 112: ...341F 4 31837700A R8A H RES CHIP 3 32K 1 1 8W 0805 4S177 RCI 0805 3321F 8 31835000A R8I P RES CHIP 6 34K 1 1 8W 0805 4S177 RCI 0805 6341F 8 31837700A R9A H RES CHIP 3 32K 1 1 8W 0805 4S177 RCI 0805 3321F 8 31835000A R9I P RES CHIP 6 34K 1 1 8W 0805 4S177 RCI 0805 6341F 8 31837700A U1 IC SN74LS04 HEX INVERTER SOIC D 14 01295 SN74LS04D 1 53807000A U2 IC SN74LS32D QUAD 2 INPUT FLOP SOIC 14 01295 SN74L...

Page 113: ...Parts List Section 6 6 23 Figure 6 9 PWA 1121A Source A6 ...

Page 114: ...Section 6 Parts List 6 24 ...

Page 115: ...Parts List Section 6 6 25 ...

Page 116: ...Section 6 Parts List 6 26 Figure 6 10 PWA 1121A Output A7 ...

Page 117: ...0805 1130B 1 31820502A R10A RES CHIP 7 87K 0 1 1 8W 0805 4S177 TPI 0805 7871B 1 31838602A R10B RES CHIP 1 13K 0 1 1 8W 0805 4S177 TPI 0805 1131B 1 31830502A R11 RES CHIP 10 0 OHMS 1 1 8W 0805 4S177 RCI 0805 10R0F 1 31810000A R13 RES CHIP 5 49K 1 1 8W 0805 4S177 RCI 0805 5491F 1 31837100A R14 RES CHIP 33 2K 1 1 8W 0805 4S177 RCI 0805 3322F 1 31845000A R15 RES VAR 50K 10 0 5W 73138 3329W 1 503 1 311...

Page 118: ...05000A U3 IC REF01 VOLTAGE REFERENCE 10V SOIC 8 51640 REF01CSZ 1 53804900A U4 5 IC SN74LS273 OCTAL D FLIP FLOP SOIC 20 01295 SN74LS273DW 2 53705400A U6 9 IC LM339 QUAD COMPARATOR 14 SOP 07263 LM339M 4 53805200A U10 IC NE5534 LOW NOISE OP AMP SOIC 8 01295 NE5534D 1 53806400A U11 IC DG201A SPST ANALOG SWITCH SOIC 16 1ES66 DG201ACSE 1 53806600A U12 IC SN74LS139 DECODER DEMULTIPLEXER SOIC 01295 SN74LS...

Page 119: ...Parts List Section 6 6 29 Figure 6 11 Front Bezel Assy A17 ...

Page 120: ...Section 6 Parts List 6 30 Figure 6 12 PWA 1121A Keyboard A13 ...

Page 121: ...01A 1 57223901A W58 CABLE ASSY COAX BL BNC SMB 04901 57226302A 1 57226302A W59 CABLE ASSY COAX Y BNC SMB 04901 57226301A 1 57226301A REF 15 CABLE ASSY POWER SWITCH 04901 57400900A 1 57400900A 11220500A REV A PWA KEYPAD 1121A A13 Figure 6 12 MODEL 1121A REF CAGE MFG PART BEC PART DESIG DESCRIPTION CODE NUMBER QTY NUMBER J33 CONN F 30 POS 60 PIN 0 5mm SP SHROUDED 55322 ERF5 030 05 0 L DV K TR 1 4930...

Page 122: ...Section 6 Parts List 6 32 Figure 6 13 Bezel Sub Assy ...

Page 123: ...Parts List Section 6 6 33 Figure 6 14 PWA 1121A Display A12 ...

Page 124: ...1 8W 0805 4S177 RCI 0805 2001F 2 31832900A R3 4 RES CHIP 100K 1 1 8W 0805 4S177 RCI 0805 1003F 2 31850000A R5 6 RES CHIP 49 9K 1 1 8W 0805 4S177 RCI 0805 4992F 2 31846700A R7 8 RES CHIP 47 5K 1 1 8W 0805 4S177 RCI 0805 4752F 2 31846500A R12 14 RES CHIP 2 43K 1 1 8W 0805 4S177 RCI 0805 2431F 3 31833700A R15 21 R23 31 RES CHIP 4 75K 1 1 8W 0805 4S177 RCI 0805 4751F 16 31836500A R32 39 RES CHIP 33 2 ...

Page 125: ...REGULATOR 3 PIN D2PAK K1422 LS1086D2T 3 53805500A XDS1 6 SOCKET IC 14 PIN 00779 2 640357 4 6 473019000 XDS7 8 SOCKET IC 16 PIN 00779 2 640358 4 2 473042000 XDS9 16 SOCKET IC 14 PIN 00779 2 640357 4 8 473019000 XDS17 19 SOCKET IC 16 PIN 00779 2 640358 4 3 473042000 XDS20 S21 SOCKET IC 14 PIN 00779 2 640357 4 2 473019000 XDS22 SOCKET IC 16 PIN 00779 2 640358 4 1 473042000 Y1 CRYSTAL CLOCK OSC 9 83MH...

Page 126: ...Section 6 Parts List 6 36 Figure 6 15 Front Panel Assy ...

Page 127: ...Parts List Section 6 6 37 Figure 6 16 Rear Panel Assy A21 Sheet 1 of 2 ...

Page 128: ...Section 6 Parts List 6 38 Figure 6 16 Rear Panel Assy A21 Sheet 2 of 2 ...

Page 129: ...Parts List Section 6 6 39 Figure 6 17 Heat Sink Assy A20 ...

Page 130: ...01 57121801A 2 57121801A W43 CABLE ASSY WIRE 24GA 4C 10 75L 04901 57120101B 1 57120101B REF 1 REAR PANEL 1121A 04901 60360100A 1 60360100A REF 6 FUSE CARRIER GRAY 1 4 x 1 1 4 61935 FEK0031 1666 1 482114000 REF 5 FUSE HOLDER 61935 FEU0031 1673 1 482117000 REF 16 COVER AC POWER 04901 81238700B 1 81238700B 11220800A REV A HEAT SINK ASSY 1121A A20 Figure 6 17 MODEL 1121A REF CAGE MFG PART BEC PART DES...

Page 131: ...Parts List Section 6 6 41 Figure 6 18 Power Amplifier A24 ...

Page 132: ...Section 6 Parts List 6 42 Figure 6 19 Transformer Assy T1 ...

Page 133: ...Parts List Section 6 6 43 Figure 6 20 1121A Card Cage Assy A18 ...

Page 134: ...Section 6 Parts List 6 44 Figure 6 21 PWA 1121A Mother A10 ...

Page 135: ...000 C124 125 CAP CER CHIP 0 1uF 20 50V 1206 31433 C1206C104M5UACTU 2 22452100A C126 128 CAP TANT CHIP 10uF 20 35V 7343 73 04222 TPSE106M035R0200 3 28341800A C129 CAP ELEC 100uF 20 25V SM SIZE F 54473 ECEV1EA101P 1 28339300A C130 132 CAP TANT CHIP 10uF 20 35V 7343 73 04222 TPSE106M035R0200 3 28341800A C135 137 CAP CER CHIP 0 1uF 10 50V 0805 31433 C0805C104K5RAC 3 20900500A CR1 DIODE SCHOTTKY BARRIE...

Page 136: ... 1 4W 1206 4S177 RCI 1206 1003 1 31950000A R104 RES CHIP 10 0K 1 1 4W 1206 4S177 RCI 1206 1002 1 31940000A R105 RES CHIP 3 01K 1 1 4W 1206 4S177 RCI 1206 3011 1 31934600A R106 RES CHIP 100 OHM 1 1 4W 1206 4S177 RCI 1206 1000F 1 33720000A R108 RES CHIP 100K 1 1 4W 1206 4S177 RCI 1206 1003 1 31950000A R109 RES NETWORK 10K 0 1 1 5W SOIC 16 54789 NOMCT16031002A 1 34600500A R110 RES CHIP 301 OHM 1 100P...

Page 137: ...Parts List Section 6 6 47 Figure 6 22 PWA 400 Hz High Pass Filter ...

Page 138: ...Section 6 Parts List 6 48 ...

Page 139: ...Schematic Diagrams Section 7 7 1 SECTION VII SCHEMATIC DIAGRAMS TABLE 7 1 LIST OF SCHEMATICS ...

Page 140: ...Section 7 Schematic Diagrams 7 2 This page intentionally blank ...

Page 141: ...Schematic Diagrams Section 7 7 3 Figure 7 1 Main Frame Schematic ...

Page 142: ...Section 7 Schematic Diagrams 7 4 Figure 7 2 Input Board A0 Parts Location Diagram ...

Page 143: ...Schematic Diagrams Section 7 7 5 Figure 7 3 Input Board A0 Schematic ...

Page 144: ...Section 7 Schematic Diagrams 7 6 Figure 7 4 Filter Board A1 Parts Location Diagram ...

Page 145: ...Schematic Diagrams Section 7 7 7 Figure 7 5 Filter Board A1 Schematic ...

Page 146: ...Section 7 Schematic Diagrams 7 8 Figure 7 6 Notch Board A2 Parts Location Diagram ...

Page 147: ...Schematic Diagrams Section 7 7 9 Figure 7 7 Notch Board A2 1Schematic ...

Page 148: ...Section 7 Schematic Diagrams 7 10 This page intentionally blank ...

Page 149: ...Schematic Diagrams Section 7 7 11 Figure 7 8 Notch Board A2 2 Schematic ...

Page 150: ...Section 7 Schematic Diagrams 7 12 Figure 7 9 Detector Board A3 Parts Location Diagram ...

Page 151: ...Schematic Diagrams Section 7 7 13 Figure 7 10 Detector Board A3 1 Schematic Figure 7 11 Detector Board A3 2 Schematic ...

Page 152: ...Section 7 Schematic Diagrams 7 14 Figure 7 12 Counter Board A4 Parts Location Diagram ...

Page 153: ...Schematic Diagrams Section 7 7 15 Figure 7 13 Counter Board A4 Schematic ...

Page 154: ...Section 7 Schematic Diagrams 7 16 Figure 7 14 C P U Board A5 Parts Location Diagram ...

Page 155: ...Schematic Diagrams Section 7 7 17 Figure 7 15 C P U Board A5 Schematic ...

Page 156: ...Section 7 Schematic Diagrams 7 18 Figure 7 16 Source Board A6 Parts Location Diagram ...

Page 157: ...Schematic Diagrams Section 7 7 19 Figure 7 17 Source Board A6 1 Schematic ...

Page 158: ...Section 7 Schematic Diagrams 7 20 This page intentionally blank ...

Page 159: ...Schematic Diagrams Section 7 7 21 Figure 7 18 Source Board A6 2 Schematic ...

Page 160: ...Section 7 Schematic Diagrams 7 22 Figure 7 19 Output Board A7 Parts Location Diagram ...

Page 161: ...Schematic Diagrams Section 7 7 23 Figure 7 20 Output Board A7 Schematic ...

Page 162: ...Section 7 Schematic Diagrams 7 24 Figure 7 21 Mother Board A10 Parts Location Diagram ...

Page 163: ...Schematic Diagrams Section 7 7 25 Figure 7 22 Mother Board A10 Schematic ...

Page 164: ...Section 7 Schematic Diagrams 7 26 This page intentionally blank ...

Page 165: ...Schematic Diagrams Section 7 7 27 Figure 7 25 Power Supply A11 2 Schematic ...

Page 166: ...Section 7 Schematic Diagrams 7 28 This page intentionally blank ...

Page 167: ...Schematic Diagrams Section 7 7 29 ...

Page 168: ...Section 7 Schematic Diagrams 7 30 Figure 7 26 Display Board A12 Parts Location Diagram ...

Page 169: ...Schematic Diagrams Section 7 7 31 Figure 7 27 Display Board A12 Schematic Sheet 1 ...

Page 170: ...Section 7 Schematic Diagrams 7 32 Figure 7 28 Key Board A13 Parts Location Diagram ...

Page 171: ...Schematic Diagrams Section 7 7 33 ...

Page 172: ...Section 7 Schematic Diagrams 7 34 ...

Page 173: ...Schematic Diagrams Section 7 7 35 ...

Page 174: ...Section 7 Schematic Diagrams 7 36 This page intentionally blank ...

Page 175: ...Schematic Diagrams Section 7 7 37 Figure 7 32 400 Hz Board A1A30 Parts Location Diagram Figure 7 33 400 Hz Board A1A30 Schematic ...

Page 176: ...Section 7 Schematic Diagrams 7 38 Figure 7 35 CCITT Board A1A31 Schematic ...

Page 177: ...Schematic Diagrams Section 7 7 39 Figure 7 36 CCIR Board A1A32 A33 Parts Location Diagram Figure 7 37 CCIR Board A1A32 A33 Schematic ...

Page 178: ...Section 7 Schematic Diagrams 7 40 Figure 7 38 A B C WTNG Board A1A34 35 36 Parts Location Diagram Figure 7 39 A B C WTNG Board A1A34 35 36 Schematic ...

Page 179: ...Schematic Diagrams Section 7 7 41 Figure 7 40 AUDIO Board A1A37 Parts Location Diagram Figure 7 41 AUDIO Board A1A37 Schematic ...

Page 180: ...Section 7 Schematic Diagrams 7 42 Figure 7 42 C MESSAGE Board A1A38 Parts Location Diagram Figure 7 43 C MESSAGE Board A1A38 Schematic ...

Page 181: ...of any product found to be defective under the terms of these warranties There will be no charge for parts and labor during the warranty period The Purchaser shall prepay shipping charges to Boonton or its designated service facility and shall return the product in its original or an equivalent shipping container Boonton or its designated service facility shall pay shipping charges to return the p...

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