HP 339A User's Manual
Contents
1. To prevent damage to the analzyer input circuits do not float the low input terminal more than 30 V dc relative to earth ground Model 339A 3 37 Monitor Output 3 38 The MONITOR output provides a means of driving external equipment to permit a more detailed analysis of the signal being measured Instruments such as an oscilloscope wave analyzer or spectrum annalyzer can be used to determine the nature of the total harmonic distortion being measured The monitor output level is I V rms for full scale meter deflection The MONITOR output is disabled when using the OSCillator LEVEL FUNCTION 3 39 OSCILLATOR OPERATION 3 40 Frequency Selection 3 41 The oscillator frequency is determined by the setting of the FREQUENCY and FREQUENCY VERNIER controls The units and tenths controls determine the first and second digits of the desired frequency These numbers are then multiplied by the range selected on the multiplier control As an example to set the oscillator to a frequency of 5 6 kHz set the units control to 5 the tenths control to 6 and the multiplier to XIK The FREQUENCY VERNIER should be set to the CAL position The FREQUENCY VERNIER provides continuous frequency tuning between steps of the tenths control to permit continuous frequency selection from 10 Hz to 110 KHz 3 42 Qutput Level 3 43 The oscillator output level is controlled by the OSCILLATOR LEVEL control and LEVEL vernier The OSCILLATOR LE2. 10 Hz 1 0 dB 2 0 dB 20 Hz 1 0 dB 100 Hz 1 0 dB 20 kHz 1 0 dB 50 kHz 1 0 dB 2 0 dB 100 kHz 1 5 dB 4 0 dB 330 kHz 1 5 dB c Adjust the Synthesizer 3330B controls for an output frequency of 1 kHz and an output amplitude of 40 dBm d Set the Low Distortion Oscillator for an output frequency of 10 kHz Adjust the output level for a meter indication of 1 V on the 339A under test e Set the FUNCTION switch of the 339A under test to DISTORTION f Adjust the Synthesizer amplitude as necessary to obtain a distortion reading of 80 dB on the 339A under test full scale meter indication g Set the Spectrum Analyzer 3571A to a 3 Hz bandwidth an input range of 10 dB V an input impedance of 1 M Q and a relative display reference Reference the Spectrum Analyzer to the 339A measurement by pressing the Enter Offset button STD B 0089 Section IV h Set the Synthesizer to each frequency listed in Table 4 7 and verify that the Spectrum Analyzer reading is within the limits listed 4 25 Residual Noise Test Equipment Required 1 k Q shielded load Refer to Figure 4 12 a Set the 339A controls as follows FUNCTION is sierra si DISTORTION FILTERS pasaritconta nni 80 kHz ON in DISTORTION RANGE 80 dB INPUT RANGE cf casiedensaeyetens IV FREQUENCY car 20 KHz 2 0 x 10 K INPUT GND SELECT vice DIS AN L center position b Connect the 1 kQ shielded load to the
3. 4 V div Oscilloscope Recommended Mode hp Model 745A AC Calibrator hp Modet 746A High Voltage Amplifier hp Made 3403C True RMS Voltmeter hp Model 8011A Pulse Generator hp Model 1221A Oscilioscope PAT PT PT Model 339A Table 1 3 Recommended Test Equipments Cont d Section I Instrument Critical Specification Recommended Model Use Frequency Counter Frequency Range hp Model 5300A 10 Hz 110 kHz Counter Mainframe p i Frequency Resolution hp Mode 5302A 1 of reading Counter Module Spectrum Analyzer Frequency Range hp Model 3044A PA i 10 Hz 330 kHz Spectrum Analyzer Frequency Resolution i input Amplitude i 1V Dynamic Range 50 dB Measurement Resolution 1 dB i Minimum Bandwidth 3 Hz Tuneable Notch Frequency Range hp Model 339A p i Filter 10 Hz 410 kHz Distortion Notch Depth Measurement 80 dB Set Low Distortion Frequency Range hp Model 239A PAT Oscillator 10 Hz 110 kHz Oscillator i Output Level i 3 V rms into 600 0 THD i gt 95 dB 10 Hz 20 KHz gt 85 dB 20 kHz 30 kHz gt 80 dB 30 kHz 50 kHz gt 70 dB 50 kHz 110 kHz i DC Digital Input Range hp Medel 3465A AT Voltmeter AV dc Digital Voltmeter Measurement Accuracy t 1 i Resolution 01 of full scale Resistors 600 Resistive hp Accessory No PA l Load 11095A i 600 N 1 Metal hp P
4. HIGH VOLTAGE hp Model 746A inspection or of a routine performance test The Performance Test Record may be reproduced without written permission of Hewlett Packard 4 7 CALIBRATION CYCLE 4 8 The Model 339A requires periodic verification of performance The performance should be tested as part of the incoming inspection and at 90 day or 6 month intervals depending upon the environmental conditions and your specific accuracy requirements 4 9 VOLTMETER PERFORMANCE TESTS 4 10 The following procedures check the accuracy of the voltmeter section of the 339A These procedures should be performed and the voltmeter accuracy verified before performing the Distortion Analyzer Performance Tests 4 11 Full Scale Accuracy and Frequency Response Test Equipment Required AC Calibrator hp Model 745A High Voltage Amplifier hp Model 746A DISTORTION MEASUREMENT SET hp Mode 339A ee anti AIR io 00090 op OD o Figure 4 1 Full Scale Accuracy and Frequency Response Tesi 4 1 Section V Model 339A Table 4 1 Full Scale Accuracy and Frequency Response Test Limits a Set the 339A controls as follows FUNCTION sevsaweaceats INPUT LEVEL FILTERS cnpicretesiianeroho OFF out METER RESPONSE criari VU INPUT RANGE essa 001 V INPUT GND SELECT DIS AN L center position b Set the AC Calibrator controls for an output of I mV 10 Hz c Connec
5. gp ul SHUN eWunjoA NA JO hued 40 GP Ui UO n10 SIp jane Be1jon Soleoipul 140394 1 Model 339A Section III SECTION Ill OPERATION 3 1 INTRODUCTION 3 2 This section contains information and instructions necessary for operation of the Model 339A Distortion Measurement Set Included is a description of operating characteristics a description of operating controls and indicators and functional checks to be performed by the operator 3 3 OPERATING CHARACTERISTICS 3 4 General 3 5 The Model 339A is designed to measure Total Harmonic distortion THD of signals having a fundamental frequency between 10 Hz and 110 kHz the analyzer section of this instrument measures total harmonic distortion levels from 100 0 dB full scale to 01 80 dB full scale in nine ranges as selected by the DISTORTION RANGE control to simplify operation the analyzer section features both automatic set level and automatic nulling 3 6 The Auto Set Level feature automatically sets the measurement reference level over a 10 dB V range If the input signal is outside this range an LED on the front panei indicates whether the INPUT RANGE control setting must be increased or decreased to be within the puli in range of the Auto Set Level 3 7 The Auto Nulling feature is fuliy automatic when the 339A internal oscillator is used as the signal source When using an external signal source an LED on the front panel indic
6. OPERATING AND SERVICE MANUAL MODEL 339A DISTORTION MEASUREMENT SET Serial Numbers 1730A00266 and Greater IMPORTANT NOTICE This manual applies directly to instruments with serial number shown on this page If changes have been made in the instrument since this manual was printed a Manual Changes supplement supplied with this manual will define these changes Be sure to record this information in your manual Backdating information contained in Section VII adapts this manual to instruments having serial numbers lower than those shown on this page WARNING To help minimize the possibility of electrical fire or shock hazards do not expose this instrument to rain or excessive moisture Manual Part No 00339 90001 Microfiche Part No 00339 90051 Copyright Hewlett Packard Company 1977 P O Box 301 Loveland Colorado 80537 U S A Printed April 1978 Model 339A Section I SECTION GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This Operating and Service Manual contains information necessary to install operate test adjust and service the Hewlett Packard Model 339A Distortion Measurement Set 1 3 This section of the manual contains the performance specifications and general operating characteristics of the Model 339A Also listed are available options and accessories and instrument and manual identification information 1 4 SPECIFICATIONS 1 5 Operating Specifications for the Model 339A
7. Figure 4 10 Fundamental Rejection and induced Distortion Test distortion signal source In most cases the Model 339A being used as a source will be sufficient However if the instrument under test does not meet the Induced Distortion specifications listed in Table 4 6 it must be determined whether the distortion is due to the signal source or the analyzer under test In some cases this may be accomplished by exchanging the signal source with another If this is not practical low pass filters may be constructed to enhance the signal purity of the source a Set the 339A controls as follows FUNCTION INPUT LEVEL PIL PERS sione OFF out METER RESPONSE NORMAL INPUT RANGE 0 3V INPUT GND SELECT DIS AN _L center position FREQUENCY 10 Hz 1 0 x 10 b Connect the equipment as shown in Figure 4 10 c Set the Low Distortion Oscillator for an output frequency of 10 Hz Adjust the output level for a full scale 0 dB meter indication on the 339A under test d Adjust the frequency of the Synthesizer 3330B for a maximum level indication on the Spectrum Analyzer 3S71A Enter this frequency as both the output frequency and step frequency of the synthesizer NOTE When adjusting the frequency of the Synthesizer use frequency steps equal to 10 of the fundamental frequency being measur ed This insures adequate resolution e Reference the Spectrum Analyzer to thi
8. 51 020 usec 50 kHz X 10K 19 608 20 408 usec 100 kHz 9 8039 10 204 usec 109 kHz 9 3615 8 9944 usec Oscillator Total Harmonic Distortion Test 339A Output Calculated Frequency 30 kHz 50 kHz 109 kHz 4 15 Section IV Modei 339A PERFORMANCE TEST RECORD Cont d DISTORTION ANALYZER PERFORMANCE Fundamental Rejection and Induced Distortion Test 339A 339A Test Fundamental Induced Frequency Rejection imi Distortion 30 kHz 50 kHz 110 kHz Distortion Measurement Accuracy Test Spectrum Distortion Analyzer Frequency Reading 10 Hz 1 0 dB 2 0 dB 20 Hz 14 0 dB 100 Hz 1 0 dB 20 kHz 1 0 dB 50 kHz 1 0 dB 2 0 dB 100 kHz 1 5 dB 4 0 dB 330 kHz 1 5 dB 4 0 dB Residual Noise Test Residual Noise with 1 KO input load and 80 kHz Filter Test Limit below 92 dB input Impedance Test Spectrum Analyzer indication for 100 kM resistance in series with 339A input freqeuncy 1 kHz Test Limit 5 97 to 6 07 dB Spectrum Analyzer indication for frequency of 17 kHz Test Limit 6 02 to 9 00 dB
9. Set the FILTER switches off out the METER RESPONSE switch to NORMAL and the INPUT GND SELECT switch to the center position DIStortion ANalyzer with input low connected to chassis ground b Set the DISTORTION RANGE control to 0 dB c Setthe INPUT RANGE control to the volt range d Set the FREQUENCY controls to a frequency of kHz i e Setthe OSCILLATOR LEVEL control to the 3 volt range f Connect a cable between the OSCILLATOR OUTPUT terminals and the DISTORTION ANALY ZER input terminals g Set the FUNCTION switch to the DISTORTION position h Adjust the OSCILLATOR LEVEL vernier for a meter indication of 15 dB V i Down range the DISTORTION RANGE control to the next lower range The meter should indicate approximately 5 dB V j Repeat Steps h and i until all distortion ranges have been checked 3 54 Filters 3 55 The following procedure checks the roll off of the filters a Set the FUNCTION switch to OSCILLATOR LEVEL b Set the INPUT RANGE control to the 3 volt range c Setthe OSCILLATOR LEVEL control to the 3 volt range and adjust the level vernier for a meter indication of 0 dB V d Set the FREQUENCY controls for a frequency of 400 Hz e Set the 400 Hz FILTER switch on in The meter should indicate 3dB V 1 dB Return the filter switch to off out f Set the FREQUENCY controls for a frequency of 30 kHz Readjust the level vernier for a meter indication 0 dB V i
10. VERNIER for the desired output frequency Use a frequency counter if frequency is critical ANALYZER ADJUSTMENT h Set the FUNCTION switch to DISTORTION i Select the proper input range by turning the METER INPUT RANGE control in the direction indicated by the INPUT RANGE indicator lights The proper input range has been selected when the INPUT RANGE control is set to the lowest range which extinguishes both indicator lights i Adjust the DISTORTION RANGE contro to obtain an on scale meter indication as near fuil scale as possible k Read the amount of total harmonic distortion THD in dB by adding the dB figure on the DISTORTION RANGE control and the dB reading of the meter or the amount of THD in per cent is indicated by the meter reading second or third scale relative to the full scale per cent figure on the DISTORTION RANGE control Figure 3 2 Distortion Measurement Using 339A internal Oscillator 3 2 Model 339A 339A DISTORTION MEASUREMENT SET LOAD IF REQUIRED PRELIMINARY ADJUSTMENTS a Set the METER RESPONSE switch to NORMAL Section HI DEVICE BEING TESTED OSCILLATOR OUTPUT b Set the ANALYZER INPUT GND SELECT switch to DiStertion ANalyzer Low input connected to chassis ground or floated as desired e Set the FILTER switches as desired d Connect the 339A DISTORTION MEASUREMENT SET and the device to be tested as shown ANALYZER ADJUSTMENTS e S
11. an RF carrier Equipment connection and measurement procedures are similar to those outlined in Figure 3 3 except the input is connected to the AM DETECTOR input 3 22 VOLTMETER OPERATION 3 23 The following procedures outline the operating procedures for the various voltmeter functions 3 24 Normal Voitmeter Operation 3 25 To use the Model 339A as a normal true rms voltmeter proceed as follows a Set the FUNCTION switch to INPUT LEVEL b Set the METER RESPONSE switch to NOR MAL c Set the INPUT GND SELECT switch to DIStortion ANalyzer low input connected to chassis ground or floating as desired Section III d Set the FILTER switches off out e Connect the signal to be measured to the DISTORTION ANALYZER input connectors f Adjust the INPUT RANGE control in the direction indicated by the INPUT RANGE indicator lights untilan on scale meter indication as near full scale as possible is obtained Both indicator lights will be off 3 26 RELATIVE LEVEL OPERATION 3 27 The RELATIVE LEVEL FUNCTION permits the user to adjust the meter gain of the 339A to set a convenient reference level on the meter usually 0 dB This function is convenient for measuring signal levels relative to a reference level To use the RELative LEVEL FUNCTION proceed as follows a Set the FUNCTION switch to RELative LEVEL b Set the METER RESPONSE switch to NOR Mal c Set the INPUT GND SELECT switch to DIStortio
12. appropriate packing material and seal well with strong tape or metal bands If the original container is not available proceed as follows a Wrap the instrument in heavy paper or plastic before placing it in an inner container b Place packing around all sides of the instrument and protect the front panel with cardboard strips or plastic foam c Place the instrument and inner container in a heavy carton and seal with strong tape or metal bands d Mark the shipping container DELICATE INSTRUMENT FRAGILE etc USINO AAISSOOXS WO4 SHNI JUGLUMIISUI DU S_OAJOIT ASNA EZ eninos JaMmod 9B A OpZ 40 A OZZ A OZL A OOL wo 9421200 01 JUBLUNIISU BY 18S SBYOMS HOLIATAS JOVLIOA OV 27 JOMOd og 10 UOIDBULIOD SEPIAGJ G 10 98UUOD INI OW LZ JUBUITIIISU OY 0 Jemod Oe sopdde yOHMS INDI OZ NOLLONN 4 73437 407BHOSO sui Buisn u ym pelgesip ale sjeunWIe HOLINOIN SUL jeubis indu pelempoulap y jo uolleluessid peleo SNOILONNA 13A37 2AHETIH PUB AAA INNI parowa peuewepun ayl yum jeUBIs jadu parejnpowap y JO uoneluasald paeje NOLLONNA NOILYOLSIG CIPADA JIM indino HOLINOW eur indu YOLOSLIG Wry au 01 parndde jeuBbis 4y pereynpow e UNAA yeuBis padde ey jo uonezuaseld PBEIS SNOILONAd 13A37 PANE WY PUY TSAST INNI PSAOW AI usaq Sey jelUBWwepUNY oyl Jee jeUBIs p ijdde ay jo sjonpoid uoNioisig NOLLONN4 NOLLHOLSIO 8Q JIA INdINO YOLINOW eu indu HAZATIVNY NOILHOLSIO 8
13. are listed in Table l I These specifications are the performance standards or limits against which the instrument is tested Table 1 2 lists general operating characteristics of the instrument These characteristics are not specifications but are typical operating characteristics included as additional information for the user 1 6 INSTRUMENT AND MANUAL IDENTIFI CATION 1 7 Instrument identification by serial number is located on the rear panel Hewlett Packard uses a two section serial number consisting of a four digit prefix and a five digit suffix separated by a letter designating the country in which the instrument was manufactured A U S A G West Germany J Japan U United Kingdom The prefix is the same for all identical instruments and changes only when a major instrument change is made The suffix however is assigned sequentially and is unique to each instrument 1 8 This manua applies to instruments with serial numbers indicated on the title page If changes have been made in the instrument since the manual was printed a yellow Manual Changes supplement supplied with the manual will define these changes and explain how to adapt the manual to the newer instruments In addition backdating information contained in Section VII adapts the manual to instruments with serial numbers lower than those listed on the title page 1 9 Part numbers for the manual and the microfiche copy of the manual are also liste
14. for at least 15 minutes 3 15 DISTORTION MEASUREMENT Model 339A 3 16 Distortion Measurement Using the 339A internal Oscillator 3 17 The Model 339A Distortion Measurment Set is designed to provide complete capability for measuring Total Harmonic Distortion by combining an automatic high resolution distortion analyzer and a low distortion signal source Figure 3 2 illustrates the fundamental application of the Model 339A The figure shows the equipment configuration and includes an operating procedure for making THD measurements 339A DISTORTION MEASUREMENT SET DEVICE BEING TESTED a oe ae _ gt OGO oscitator QUTPUT OUTPUT MONITOR r OUTPUT name FA cat 600 Q DISTORTION hp MODEL 11095A ANALYZER INPUT PRELIMINARY ADJUSTMENTS a Set the OSCILLATOR LEVEL control to OFF b Set the METER RESPONSE switch to NORMai c Set the ANALYZER INPUT GND SELECT switch to DiStortion ANalyzer Low input connected to chassis ground or floated as desired d Set FILTER switches as desired e Connect the 339A DISTORTION MEASUREMENT SET and the device to be tested as shown OSCILLATOR ADJUSTMENT f Set the FUNCTION switch to OSCillator LEVEL and adjust the OSCILLATOR LEVEL and LEVEL vernier controls for the desired signal level as indicated on the meter Change the METER INPUT RANGE switch as necesary to obtain the proper meter range g Set the FREQUENCY controls and FREQUENCY
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16. 19 608 mSec 10 204 mSec 9 803 mSec 10 204 mSec 9 803 mSec X 100 5 1020 mSec 4 9019 mSec 2 0408 mSec 1 9608 mSec 1 0204 mSec 9803 mSec 1 kHz 1020 4 uSec 980 3 uSec 1 1 kHz 927 64 uSec 891 26 uSec 1 2 KHz 850 34 uSec 816 99 uSec 1 3 KHz 784 93 uSec 754 14 uSec 1 4 KHZ 728 86 uSec 700 28 pSec 1 5 KHz 680 27 uSec 653 59 Sec 1 6 kHz 637 75 uSec 612 74 Sec 1 7 kHz 600 24 uSec 576 70 uSec 1 8 kHz X 1K 566 89 uSec 544 66 uSec 1 9 kHz 537 05 uSec 515 99 uSec 2 0 kHz 510 20 uSec 490 19 uSec 3 0 kHz 340 13 uSec 326 79 uSec 4 0 kHz 255 10 uSec 245 09 uSec 5 0 kHz 204 08 uSec 196 08 uSec 6 0 kHz 170 06 uSec 163 39 uSec 7 0 kHz 145 77 uSec 140 05 uSec 8 0 kHz 127 55 uSec 122 54 uSec 9 0 kHz 113 37 uSec 108 93 Sec 10 0 kHz 102 04 uSec 98 039 uSec 10 kHz 102 04 uSec 98 039 uSec 20 kHz 51 020 uSec 49 019 pSec 50 kHz X10K 20 408 uSec 19 608 uSec 100 kHz 10 204 uSec 9 8039 uSec 109 kHz 9 3615 Sec 8 9944 Sec b Connect the equipment as shown in Figure 4 7 c Adjust the Frequency Counter controls to measure period d The 339A 10 Hz frequency should be within the limits listed in Table 4 4 e Verify the 339A Oscillator Frequency Accuracy for each frequency listed in Table 4 4 4 19 Oscillator Total Harmonic Distortion Test Equipment Required Spectrum Analyzer hp Model 3044A Tuneable Notch Filter hp Model 33
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18. 9A 600 ohm Resistive Load hp 11095A Section IV a Set the 339A controls as follows FUNCTION OSCillator LEVEL FREQUENCY 10 Hz 1 0 x 10 FREQUENCY VERNIER CAL OSCILLATOR LEVEL 3 V b Connect the equipment as shown in Figure 4 8 c Adjust the 339A OSCILLATOR LEVEL vernier for an output level of 3 V rms as indicated on the 339A meter d Set the Tuneable Notch Filter 339A Frequency to 10 Hz and set the Function to Input Level Adjust the Input Range control as necessary to obtain an on scale meter indication as near full scale as possible e Set the Spectrum Analyzer 3571A controls for an input impedance of MQ an input range of 10dBV a bandwidth of 3 Hz and a relative display reference f Tune the Spectrum Analyzer to the exact frequency of the 339A under test by varying the Synthesizer 3330B frequency until the Spectrum Analyzer indicates maximum level Enter this frequency as both the output frequency and step frequency of the Synthesizer g Reference the Spectrum Analyzer to the amplitude of the 339A fundamental frequency by pressing the Enter Offset button Observe a Spectrum Analyzer display of 00 00 dB h Adjust the Tuneable Notch Filter controls as necessary to make a distortion measurement The purpose of this step is to null the fundamental frequency of the 339A Oscillator output This puts the distortion products within the dynamic range of the Spec
19. A Ji diJ O ds iJ E io oL o Ta gi DISTORTION MEASUREMENT SET hp Model 339A A i008 5 9 COMOD GS DISTORTION ANALYZER INPUT Figure 4 3 RMS Accuracy Test SPECTRUM ANALYZER hp Modei 3044A DISTORTION MEASUREMENT SET hp Model 339A Figure 4 4 Filter Accuracy Test 4 3 Section IV a Set the 339A controls as follows FUNCTION suini INPUT LEVEL FILTERS eta iosa OFF tout METER RESPONSE 3265050000000 VU INPUT RANGE 33 aeiwdsepankwnsaeee iV INPUT GND SELECT DIS AN 4L center position b Set the AC Calibrator controls for an output of I V kHz c Set the True RMS Voltmeter to read AC Volts on the V range d Connect the equipment as shown in Figure 4 2 e The 339A 1 V meter indication and MONITOR output level shouid be within the Test Limits listed in Table 4 2 f Using the AC Calibrator verify the 339A meter accuracy and MONITOR output accuracy for each input level listed in Table 4 2 Table 4 2 Meter Tracking and MONITOR Output Accuracy Tests Monitor Meter indication A 13 RMS Accuracy crest factor Test Equipment Required Pulse Generator hp Model 8011A True RMS Voltmeter hp Model 3403C Oscilloscope hp Model 1221A a Set the 339A controls as follows FUNCTION INPUT LEVEL FILTERS cio OFF out METER RESPONSE VU INPUT RANGE cehreri trecie 3 V IN
20. A Low Distortion Oscillator hp Model 339A 600 1 Metal Film Resistor hp Part No Equipment Required k Determine the relative amplitude of the second 0698 5405 harmonic by adding the Spectrum Analyzer display 60 kM 1 Metal Film Resistor hp Part No reading and the distortion range setting of the 339A 0698 5973 under test Record the amplitude reading of the second 7 harmonic a Set the 339A controls as follows L Step the Synthesizer frequency to the third FUNCTION essea INPUT LEVEL harmonic frequency FILTERS sacrsiewessodeaa sabes OFF out DISTORTION RANGE 80 dB m Determine the relative amplitude of the third INPUT RANGE iii IV harmonic by adding the Spectrum Analyzer display INPUT GND SELECT DIS AN L reading and the distortion range setting of the 339A center position under test Record the amplitude reading of the third FREQUENCY 10 kHz 1 0 x 10 K harmonic va b Connect the equipment as shown in Figure 4 11 n Calculate the Induced Harmonic Distortion using the graph shown in Figure 4 9 SPECTRUM ANALYZER hp MODEL 3044A LOW DISTORTION OSCILLATOR hps MODEL ide DISTORTION MEASUREMENT SET hp MODEL 339A RESISTOR RESISTOR Figure 4 11 Distortion Measurement Accuracy Test 4 10 Model 339A Table 4 7 Distortion Measurement Accuracy Test Distortion Accuracy Frequency Limits
21. DISTORTION ANALYZER input terminals See Figure 4 12 for construction details of 1 k Q load c The 339A measurement indication must be below 92 dB 4 26 Input Impedance Test Equipment Required Spectrum Analyzer hp Model 3044A 100 k Q 0 1 Metal Film Resistor hp Part No 0698 4158 1251 0174 1251 0175 0360 0042 0757 0280 Connector male Connector male w insulator Lug terminai 90 Resistor 1 KO 1 8 W 1 metal fim 2190 0007 0380 0058 1251 1073 2360 0113 Washer int tock Spacer 6 32 thirraded Shield Screw pan head 6 32 x 1 4in Figure 4 12 Shielded Load Assembiy Section IV Model 339A DISTORTION MEASUREMENT SET hp Model 339A 100 kN SERIES RESISTOR Figure 4 13 Input impedance Test a Set the 339A controis as follows FUNCTION 02000 INPUT LEVEL FILIERS Glielo OFF out INPUS RANGE caseina bianato 1 V INPUT GND SELECT center position DIS AN L b Connect the equipment as shown in Figure 4 13 c Set the Synthesizer 3330B for an output frequency of 1 kHz and adjust the amplitude as necessary to obtain a meter reading of 0 dB on the 339A 4 12 d Set the Spectrum Analyzer 3571A reference by pressing the Enter Offset button Observe a display reading of 00 00 dB e Disconnect the cable from the 339A and insert the 100 k Q resistor in series with the input The Spectrum Analyzer must i
22. Level No set level adjustment required Distortion measurements are made directiy over 10 dB range selected by input range switch Two LED annunciators provide a fast visual indication to change input range for valid distortion measurement Correct range is indicated when both annunciators are extinguished Auto Null Using internal oscillators No manual frequency tuning necessary when using internal oscillator as signal source Oscillator frequency controls simultaneously tune the analyzer Using external frequency source Two LED annunciators provide a quick visual indication for the operator to in crease or decrease the analyzer frequency controls When the analyzer is rough tuned to within one least significant digit of the fundamental frequency the in dicator lights are extinguished and the 339A auto null circuitry takes over to provide a fast accurate null without tedious operator tuning Input Filters usable on all functions Low Pass 30 kHz 3 dB point at 30 KHz 2 6 kHz 3 kHz Provides band limiting required by FCC for proof of performance broadcast testing 80 kHz 3 dB point at 80 kHz 7 kHz 7 9 kHz Normally used with fundamental frequencies lt 20 kHz to reduce the effect of higher frequency noise present in the measured signal High Pass 400 Hz 3 dB point at 400 Hz 35 Hz 40 Hz Normally used with fundamental frequencies gt 1 kHz to reduce the effect of hum components in the
23. ORMANCE l Output Level and Flatness Test 339A Output Output Test Frequency Level Limits 10 Hz 2 930 3 070 20 Hz 2 965 3 035 100 Hz 2 965 3 035 10 kHz 2 965 3 035 20 kHz 2 965 3 035 110 kHz 2 930 3 070 Maximum Output Level into 600 Ws gt 3 V rms Output impedance Test With an unioaded output level of 6 00 V rms the output ievel into a 600 2 load test limit 2 927 3 077 V rms Oscillator Frequency Accuracy Test 339A Frequency 339A Frequency Counter Output Range indication Test Frequency Setting Limits j 98 04 102 04 msec 49 019 51 020 msec 19 608 20 408 msec 9 803 10 204 msec 9 803 10 204 msec 4 9019 5 1020 msec 1 9608 2 0408 msec 9803 1 0204 msec 4 14 Model 339A Section IV PERFORMANCE TEST RECORD Contd Oscillator Frequency Accuracy Test Cont d 339A Frequency 339A Frequency Counter Output l Range Indication Test Frequency Setting Period Limits 980 3 1020 4 usec 891 26 927 64 usec 816 99 850 34 usec 754 14 784 93 usec 700 28 728 86 usec 653 59 680 27 usec L_z 612 74 637 75 psec 576 70 600 24 usec X 1K msi i m 24 66 566 89 usec 515 99 537 05 usec 490 19 510 20 usec 326 79 340 13 usec 245 09 255 10 usec 196 08 204 08 usec 163 39 170 06 usec 140 05 145 77 psec 122 54 127 55 usec 108 93 113 37 usec 98 039 102 04 usec 10 kHz 20 kHz 98 039 102 04 usec 49 019
24. PUT GND SELECT DIS AN L center position 4 4 Model 339A b Connect the equipment as shown in Figure 4 3 c Adiust the pulse generator for a 10 V peak to peak positive pulse with a repetition rate of KHz as observed en the oscilloscope d Adjust the Pulse Geneator symmetry until the true RMS voltmeter indicates 3 00 V rms NOTE The pulse generator amplitude and symmetry controls may interact Repeat adjustments as necessary to obtain a true rms meter indication of 3 V and an oscilloscope presentation of 10 V peak to peak e The 339A meter indication must be 3 volts 06 volts f Change the Pulse Generator repetition rate to 100 Hz Readjust the amplitude and symmetry as necessary to obtain a true RMS meter indication of 3 Vanda 10 V peak to peak oscilloscope presentation g The 339A meter indication must be 3 V 06 volts h Change the Pulse Generator repetition rate to 10 kHz Readjust the amplitude and symmetry as necessary to obtain a True RMS meter reading of 3 V anda 10 V peak to peak oscilloscope presentation i The 339A meter indication must be 3 V 12 volts AAA Filter Accuracy Test Equipment Required _ a Spectrum Analyzer hp Model 3044A a Set the 339A controls as follows FUNCTION siii INPUT LEVEL PILIERS patiti OFF out METER RESPONSE VU INPUT RANGE 0000 LV INPUT GND SELECT DIS AN _L center position Lei b Connect th
25. TORTION Fundamental Frequency Range 10 Hz to 110 kHz continuous frequency coverage in 4 decade ranges with 2 digit resolution Distortion analyzer and oscillator are simultaneously tuned Distortion Measurement Range 0 01 full scale to 100 full scale 80 dB to 0 dB in 9 ranges Detection and Meter indication True rms detection for waveforms with crest factor lt 3 Meter reads dB and THD Total Harmonic Distortion Meter response can be changed from NORMAL to VU ballistics with a front panel switch Distortion Measurement Accuracy 20 Hz to 20 kHz t1 dB 10 Hz to 50 kHz 1 2 dB 50 kHz to 110 kHz 1 5 4 dB NOTE The above specifications apply for harmonics lt 330 kHz Fundamental Rejection 10 Hzto 20 kHz gt 100 dB 20 kHz te 50 kHz gt 90dB 50 kHz to 110 kHz gt 86 dB Distortion introduced by Instrument input gt 1 V rms 10 Hzto 20 kHz lt 95 dB 20 kHz to 30 kHz lt 90 dB 30 kHz to 50 kHz lt 85 dB 50 kHz to 110 kHz lt 70 dB Residual Noise Fundamental frequency setting lt 20 kHz 80 kHz filter in source resistance lt 1 KO shielded lt 92 dB referenced to 1 V Input Level for Distortion Measurements 30 mV to 300 V rms 100 mV range minimum Input Impedance 100 KO 1 0 shunted by lt 100 pF input High to Low DC Isolation Input low may be connected to chassis ground or floated 30 V to reduce the effects of ground loops on the measurement Auto Set
26. VEL control selects output levels from 3 mV rms full scale to 3 V rms full scale in 10 dB V steps 600 ohm load The level vernier varies the output level from greater than 3 V rms to less than mV rms 600 ohm load 3 44 OPERATIONAL VERIFICATION CHECKS 3 45 The following procedures are designed to test the operational capabilities of the Model 339A If so desired these tests can be substituted for the performance tests outlined in Section IV for incoming inspection tests orto check operation after calibration Keep in mind however these tests check only the operational capabilities of the Models 339A They do not check the performance accuracy If the instrument fails any of the following tests refer service to qualified service personnel 3 46 Preliminary Procedure 3 47 Before connecting power to the 339A perform the following a Be certain that the rear panel VOLTAGE SELECTOR switches are set to correspond to the Section UI available power line voltage and that the proper fuse is installed b Connect power to the 339A and turn the LINE switch ON c Set the FILTER switches off out d Set the METER RESPONSE switch to NOR MAL 3 48 OSCILLATOR 3 49 This procedure checks the output level of the 339A oscillator for all frequency settings Frequency accuracy is not checked To check the oscillator proceed as follows a Set the FUNCTION switch to OSCillator LEVEL b Set the INPUT RANGE control t
27. Y controls must be set to be within the Auto Nulling range Distortion characteristics of the input signal can be monitored at the MONITOR OUTPUT terminals with external equipment oscillo scope voltmeter spectrum analyzer etc to provide additional analysis of the distortion products 1 14 The Model 339A is equippped with an amplitude modulation AM detector which has a frequency response from 550 kHz to 1 6 MHz The AM detector permits the measurement of modulation distortion 1 15 The 339A contains three active filters one high pass and two low pass which enables the user to eliminate unwanted frequencies and noise to permit higher resolution measurements 1 16 The ac voltmeter section of the 339A measures the rms value of input voltage from 1 mV full scale to 300 V full scale in twelve ranges In the VU meter mode the 1 1 Section meter response characteristics are changed to those of a volume units meter 1 17 OPTIONS 18 The following options are available for use with the Model 339A Option 907 Front Handle Kit Model 339A Option 908 Rack Mounting Kit Option 909 Front Handle and Rack Mounting Kit Option910 Additional Operating and Service Manuai 1 19 Recommended Test Equipment 1 20 Equipment required to maintain the Model 339A is listed in Table 1 3 Other equipment may be substituted if it meets the critical requirements listed in the table Table 1 1 Specifications DIS
28. art No Film 0698 5405 60 kN 1 Metal hp Part No Film 0698 5973 p i 100 k 1 hp Part No Metal Film 0698 4158 1 kQ 1 hp Part No i Metal Film 0757 0280 P Performance Test A Adjustment Procedures T Troubleshooting 1 5 1 6 Model 339A Section Il SECTION li INSTALLATION 2 1 INTRODUCTION 2 2 This section of the manual contains information and instructions necessary to install the Model 339A Distortion Measurement Set Also included are initial inspection procedures power and grounding require ments environmental information and packaging instructions 2 3 INITIAL INSPECTION 2 4 This instrument was carefully inspected both mechanicaliy and electrically before shipment It should be free of mars and scratches and in perfect electrical order The instrument should be inspected upon receipt for damage that might have occured in transit If the shipping container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and the instrument has been mechanically and electrically inspected Procedures for testing the electrical performance of the Model 339A are given in Section IV of this manual If the contents are incomplete if there is mechanical damage or defect or if the instrument does not pass the Performance Tests notify the nearest Hewlett Packard Office A list of the hp Sales and Service Offices is prese
29. ates which direction the FREQUENCY controls must be rotated to be within the Auto Nulling range 3 8 The Model 339A includes an AM detector which has a carrier frequency range of 550 k Hz to 1 6 MHz The AM detector permits the measurement of THD of a modulation signal 3 9 The signal source used in the Model 339A is a bridged T oscillator which provides a low distortion sine wave signal from 10 Hz to 110 kHz The operating frequencies of the oscillator and the analyzer notch filter are set simultaneously The output level of the oscillator is variable from 1 mV rms full scale to 3 V rms full scale into a 600 load 3 10 The ac voltmeter section of the Model 339A measures the true rms value of input voltages from I mV fuli scale to 300 V full scale in twelve ranges Frequency response of the meter section is 10 Hz to 110 kHz 3 11 True RMS VS Average Responding Detection 3 12 Since the 339A employs a true rms converter to detect the measurement signal it is less susceptible to errors than average responding devices Most average responding meters are calibrated to indicate the rms value of a pure sine wave When reading a pure sine wave both the true rms and average responding meters will give the correct indication However when reading complex signals the average responding meter may be in error The amount or error depends upon the particular signal being measured As an example when measuring a square wave th
30. cy must be between 72 1 kHz and 87 kHz r Set the 339A 80 kHz FILTER to OFF out DISTORTION MEASUREMENT SET hp Model 339A Las 2009 Section IV 4 15 OSCILLATOR PERFORMANCE TESTS 4 16 Output Level and Fiatness Test Equipment Required True RMS Voltmeter hp Model 3403C 600 ohm Resistive Load hp 11095A a Set the 339A controls as follows FREQUENCY I kHz 1 0 x 1 K FREQUENCY VERNIER CAL OSCILLATOR LEVEL cisco 3V LEVEL vernier hs retina fully CW b Set the True RMS Voltmeter controls to measure AC Volts c Connect the equipment as shown in Figure 4 5 d The True RMS Voltmeter indication must be greater than 3 V typically gt 3 4 V e Adjust the 339A LEVEL vernier for a reading of 3 00 V as indicated on the True RMS Voltmeter f Set the 339A to each FREQUENCY listed in Table 4 3 and verify that the output level is within the limits specified 4 17 Qutput Impedance Test Equipment Required True RMS Voltmeter hp Model 3403C 600 ohm Resistive Load hp Model 11095A a Set the 339A controls as follows FREQUENCY l kHz 1 0 x 1 K TRUE RMS VOLTMETER hp Modei 3403C 600 LOAD hp 11095A Figure 4 5 Oscillator Output Level and Fiatness Test 4 5 Section IV DISTORTION MEASUREMENT SET hp Model 339A Model 3394 TRUE RMS VOLTMETER hp Model 3403C A 600 N LOAD hp 11095A Figure 4 6 Oscillator O
31. d on the title page 1 10 DESCRIPTION 1 11 The Model 339A Distortion Measurement Set combines a low distortion signal source a high resolu tion distortion analyzer an rms responding voltmeter and a VU volume units meter in one unit 1 12 The signal source used in the Model 339A is a bridged T oscillator which provides a low distortion sine wave signal from 10 Hz to 110 kHz The output amplitude is variable from 1 mV rms to 3 V rms into a 600 ohm load and is maintained by an amplitude control circuit which minimizes amplitude variations even when changing frequency ranges 1 13 The distortion analyzer section of the 339A contains a tracking notch filter which is tuned to the oscillator frequency The analyzer measures total harmonic distortion THD from 100 full scale to 01 full scale in nine ranges and features both automatic Set Level and automatic Nulling to greatly simplify operation The Auto Set Level feature automatically sets the reference level over a 10 dB range If the input signal is outside this range a LED on the front panel indicates whether the INPUT RANGE control setting must be increased or decreased to be within the pull in range of the Auto Set Level The Auto Nulling feature is fully automatic when the 339A internal oscillator is used as the signal source When an external oscillator is used as the signal source an LED on the front panel indicates which direction the FREQUENC
32. ded with the instrument notify the nearest hp Sales and Service Office and the proper cable will be provided 2 12 Grounding Requirements 2 13 To protect operating personnel the National Electrical Manufacturer s Association NEMA recommends that the instrument cabinet and front panel be grounded The Mode 339A is equipped with a three 125 V 6A 250 V 6A Bi20 1348 8120 0698 UL LISTED FOR USE IN THE UNITED STATES OF AMERICA Figure 2 2 Power Cord Configurations 2 1 Section H conductor power cable which when plugged into an appropriate receptacle grounds the instrument 2 14 Bench Use 2 15 The Model 339A is shipped with plastic feet and tilt stands installed and is ready for use as a bench instrument The plastic feet are shaped to permit stacking with other full module Hewlett Packard instruments The tilt stands permit the operator to elevate the front of the instrument for operating and viewing convenience 2 16 Rack Mounting 2 17 The Model 339A may be rack mounted by adding rack mounting kit Option 908 or Option 909 Option 908 contains the basic hardware and instructions for rack mounting Option 909 adds front handles to the basic rack mount kit The rack mount kits are designed to permit the instrument to be installed in a standard 19 inch rack i 2 18 ENVIRONMENTAL REQUIREMENTS WARNING To prevent electrical shock or fire hazard do not expose the instrument to rain or moistu
33. e equipment as shown in Figure 4 4 c Set theSynthesizer 3330B output frequency to 400 Hz and adjust the output level for a full scale meter reading on the 339A d Set the Spectrum Analyzer 3571A controls for an input impedance of 1 MQ an input range of 10dBV a bandwidth of 3 Hz and a relative display reference Model 339A e Set the Spectrum Analyzers measurement reference by pressing the Enter Offset button The Spectrum i ATA should display 00 00 dB hi Set the 339A 400 Hz FILTER switch to ON in g Adjust the Synthesizer frequency until the Spectrum Analyzer indicates a reading of 3 00 dB The Synthesizer frequency must be between 360 Hz and 435 Hz h Set the 339A 400 Hz FILTER to OFF out i Set the Synthesizer output frequency to 30 kHz _ j Set the Spectrum Analyzers measurement reference by pressing the Enter Offset button k Set the 339A 30 kHz FILTER switch to ON in I Adjust the Synthesizer frequency as necessary to obtain a Spectrum Analyzer reading of 3 00 dB The Synthesizer frequency must be between 27 kHz and 32 6 kHz m Set the 339A 30 kHz FILTER to OFF out n Set the Synthesizer output frequency to 80 kHz o Set the Spectrum Analyzers measurement reference by pressing the Enter Offset button p Set the 339A 80 kHz FILTER switch to ON in q Adjust the Synthesizer frequency as necessary to obtain a Spectrum Analyzer reading of 3 00 dB The Synthesizer frequen
34. e true rms meter will give the correct indication of the rms value The average responding meter however will read 11 high The average responding meter is also affected by signals with harmonic content The amount of error introduced by an average responding meter due to harmonics is dependent upon the relative amplitude phase and order of the harmonic The third harmonic usualiy causes the greatest amount of error Forexample when measuring a signal with third harmonic content an average responding meter can be in error by 5 to 20 depending upon the amplitude and phase of the harmonic relative to the fundamental frequency Due to the errors inherent in average responding meters a distortion analyzer which employs this type of detector will also be subject to the same measurement errors These errors can cause indicated distortion readings to be as much as 1 3 dB below the actual rms value for certain combinations of second and third harmonics The Model 339A is not affected by the errors associated with average responding detectors and will provide more accurate measurement indications 3 Section IH 3 13 Turn On and Warm Up 3 14 Before connecting ac power to the 339A be certain the rear panel voltage selector switches are set to correspond to the voltage of the available power line and that the proper fuse is installed for the voltage selected For rated measurement accuracy the 339A should be allowed to warm up
35. ely the 1 5 level on the vertical axls The total harmonic distortion is therefore the amplitude of the largest harmonic 2nd harmonic plus the number determined on the vertical axis 110 dB 1 5 dB 108 5 dB n The 339A should meet the 10 Hz THD specification listed in Table 4 5 T45A4 B 2230 8 10 12 14 o Repeat Steps f through m for each fregeuncy listed DECIBEL DIFFERENCE BETWEEN TWO VALUES in Table 4 5 ni Dl Qui q gt Li utj D_ O Po H aw ae opel Oo i ak uil CO om ict oy ZO she NOTE Figure 4 9 Logarithmic Addition of Harmonic Components It may be necessary to increase the Bandwidth of the Spectrum Analyzer at higher frequencies Adjust as necessary to maintaina Table 4 5 Oscillator Total Harmonic Distortion stahie reading Test 4 20 DISTORTION ANALYZER PERFOR MANCE TESTS 339A THD Frequency Specification 4 21 The Voltmeter Performance Tests at the TOA beginning of this section should be performed and the 100 Hz a 1 kHz Voltmeter accuracy verified before proceeding with the 10 kHz Distortion Analyzer Tests 20 kHz g 30 kHz 4 22 Fundamental Rejection and Induced 50 kHz Distortion Test i 109 kHz 4 23 The following test requires an exceptionaliy low 4 8 Model 339A SPECTRUM ANALYZER hp Model 3044A Section IV LOW DISTORTION OSCILLATOR hp MODEL 239A DISTORTION MEASUREMENT SET hp Model 339A
36. et the FUNCTION switch to DISTORTION f Select the proper input range by turning the METER INPUT RANGE control in the direction indicated by the INPUT RANGE indicator lights The proper input range has been selected when the INPUT RANGE control is set to the lowest range which extinguishes both indicator lights g Slowly adjust the FREQUENCY controis in the direction indicated by the FREQUENCY indicator lights The proper frequency range has been selected when both indicator lights are extinguished h Adjust the DISTORTION RANGE control to obtain an on scale meter indication as near full scale as possible i Read the amount of total harmonic distortion THD in dB by adding the dB figure on the DISTORTION RANGE control and the dB reading of the meter or the amount of THD in per cent is indicated by the meter reading second or third scale relative to the full scale per cent figure on the DISTORTION RANGE controi Figure 3 3 Distortion Measurement of an External Source 3 18 Distortion Measurement of an Externai Source Figure 3 3 shows another measurement application In this case the Model 339A is used to measure the THD of a signal source The figure includes an illustration of the necesary equipment connections and an operating procedure for making the measurement 3 20 AM DETECTOR 3 21 The Model 339A includes an AM DETECTOR to permit the user to measure the total harmonic distortion of a modulation signal on
37. f necessary g Set the 30 kHz filter switch on in The meter Model 339A should indicate 3 dB V 2 dB Return the filter switch to off out h Set the FREQUENCY controls for a frequency of 80 kHz Readjust the level vernier for a meter indication of 0 dB V if necessary i i Set the 80 kHz filter switch on in The meter should indicate 3 dB V 2 dB Return the filter switch to off out 3 56 OPERATOR S MAINTENANCE 3 57 Fuse Replacement 3 58 The ac line fuse is located on the rear panel of the instrument Before checking or replacing the fuse disconnect the ac line cord from the instrument The fuse used in the Model 339A ts a 250 mA normal blow fuse For continued protection against fire hazard replace only with the same type and rating of fuse as specified for the line voltage being used Section IH 3 59 Adjustment of Meter Mechanical Zero 3 60 The meter is properly zero set when the pointer rests over the zero calibration mark with the instrument in its normal operating environment and turned off Zero set the meter as follows to obtain maximum accuracy and mechanical stability a Turn instrument on and alow it to operate for at least 20 minutes to let meter movement reach normal operating temperature b Turn instrument off and allow 30 seconds for all capacitors to discharge c Rotate zero adjustment screw clockwise until pointer is left of zero and moving upscale d Continue rota
38. fora frequency of kHz e Set the OSCILLATOR LEVEL control to the 3 volt range f Connect a cable from the OSCILLATOR OUTPUT terminals to the DISTORTION ANALYZER input terminals g Adjust the OSCILLATOR LEVEL vernier for a meter indication of 6 volts o h While observing the meter set the INPUT RANGE control to the 30 100 and 300 volts ranges The meter should indicate 6 volts on the respective ranges The left hand INPUT RANGE indicator light should be lit on all three ranges i Set the INPUT RANGE switch to the 3 volt range Observe that the right hand INPUT RANGE indicator is lit j Down range the OSCILLATOR LEVEL control to the next lower range and adjust the level vernier for a meter indication 10 dB V k Down range the INPUT RANGE control to the next lower range The meter should indicate 0 dB V E 2 dB V L Repeat Steps j and k until all input ranges except the 001 V range have been checked m Set the INPUT RANGE control to the 10 volt range and the OSCILLATOR LEVEL control to the 3 volt range n Adjust the level vernier for a meter indication of 12 dB V o Set the FUNCTION switch to the RELATIVE LEVEL position p Vary the RELATIVE ADJUST control to verify an adjustment range of greater than 10 dB V 3 52 Distortion Analyzer 3 53 The following procedure checks the distortion 3 6 Model 339A analyzer ranges and distortion measurement capability Perform the following steps a
39. input signal Monitor Output Provides scaled presentation of input signal after Model 339A Section I Table 1 1 Specifications Cont d fundamental is removed for further analysis using oscilloscope or low frequency spectrum analyzer Output Voltage 1 V rms 5 open circuit for full scale meter indication proportional to meter deflection Output Resistance 1 kO 5 VOLTMETER Voltage Range 1 mV rms full scale to 300 V rms full scale 60 dB to 50 dB full scale meter calibrated in dBV and dBm into 600 Q Frequency Range 10 Hz to 110 kHz Accuracy of range setting 20 Hz to 20 kHz 2 40 Hz to 110 kHz 4 Detection and Meter indication True rms detection for waveforms with crest factor lt 3 Meter reads true rms volts dB V and dBm into 6000 input impedance 100 K2 1 0 shunted by lt 100 pF input High to Low Monitor Output Provides scaied presentation of input signal for further analysis using oscilloscope or low frequency spectrum analyzer Output Voltage 1 V rms t5 open circuit for full scale meter indication proportional to meter defiection Output Resistance 1 kf 5 RELATIVE INPUT LEVEL Provides a ratio measurement relative to an operator selected reference level with readout directly in dB V or dBm 600 N Voltage range frequency range accuracy specifications and monitor are the same as in VOLTMETER mode Accuracy is relative to O dB set level inpu
40. n ANalyzer Low input connected to chassis ground or floating as desired d Set the FILTER switches off out e Connect the reference signal to the DISTORTION ANALYZER input connectors f Adjust the INPUT RANGE control in the direction indicated by the INPUT RANGE indicator lights until an on scale meter indication is obtained g Use the RELATIVE ADJUST control to set the meter to the desired reference level h Measure other input levels relative to the reference just established Do not change the RELATIVE ADJUST control 3 28 Oscillator Level Operation 3 29 In the OSCillator LEVEL function the analyzer inputs and the MONITOR output is disabled and the 339A meter circuit is used to monitor the output level of the oscillator To measure the oscillator output level perform the following a Set the FUNCTION switch to OSCillator LEVEL b Set the METER RESPONSE switch to NOR MAL c Set the FILTER switches to off out d Adjust the INPUT RANGE control as necessary to obtain an on scale meter indication as near full scale as possible 3 4 Model 339A e The meter reading relative to the meter range selected by the INPUT RANGE control indicates the output level of the oscillator 3 30 To adjust the oscillator output toa particular level perform the following a Set the FUNCTION switch to OSCillator LEVEL b Set the METER RESPONSE switch to NOR MAL c Set the FILTER switches t
41. ndicate 6 02 dB 05 dB f Change the Synthesizer frequency to 17 000 kHz The Spectrum Analyzer reading must be less than 9 00 dB indicating an input capacitance of less than 100 pF Model 339A Section IV PERFORMANCE TEST RECORD Hewlett Packard Model 339A Tests Performed By Distortion Measurement Set Date Seriai No VOLTMETER PERFORMANCE Full Scale Accuracy and Frequency Response Test 339A 339A 339A 339A 339A 339A 339A 339A Input input 10 Hz 110 KHz Test 20 Hz 100 Hz 1 kHz 10 kHz 20 kHz Level Range Reading Reading Limits Reading j Reading Reading Reading Reading 001 V_ 001V 00096 00104 00098 00102 003 V 003 V 00288 00312 00294 00306 Otv O1V 0096 0104 0098 0102 03V O03 V 0288 0312 0294 0306 Iv 17V 096 104 098 102 3V 3V 288 312 294 306 1V 1V 96 1 04 98 1 02 3V 3V 2 88 3 12 2 94 3 06 TOV 10V 9 6 10 4 9 8 10 2 30V 30V 28 8 31 2 29 4 30 6 100 V 100V 96 104 98 102 300 V 300 V 288 312 294 306 Meter Tracking and Monitor Output Accuracy Test 3393A Monitor Meter Test Output Reading Limits Level ion IV Mode 33 sai PERFORMANCE TEST RECORD Cont d i RMS Accuracy crest factor Test Filter Accuracy Test 339A Repetition Meter Test Rate Reading Limits 3394 3 dB Test Filter Frequency Limits 360 Hz 435 Hz 27 kHz 32 6 kHz 72 1 kHz 87 kHz 2 94 3 06 2 94 3 06 2 88 3 12 OSCILLATOR PERF
42. nted at the back of this manual If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard Office Save the shipping materials for the carriers inspection 2 5 PREPARATION FOR USE 2 6 Power Requirements 2 7 The Model 339A requires a power source of 100 120 220 or 240 V ac 5 10 48 Hz to 66 Hz single phase Maximum power consumption is 48 VA 2 8 Line Voltage Selection 2 9 Before connecting ac power to the Model 339A make sure the rear panel line selector switches are set to correspond to the available power line voltage and that the proper fuse is installed as shown in Figure 2 1 The instrument is shipped from the factory with the line voltage and fuse selected for 120 V ac operation 2 10 Power Cabie 2 11 Figure 2 2 illustrates the standard configurations used for hp power cables The number directly below each drawing is the hp part number for a power cable equipped with a connector of that configuration If the I00V 120V 240V 220V 100 Volts IOV IZOV 240V 220V 20 Volts 100V I20Y 240 220V 240 Volts STR 08 3548 m OO ROV 240V V 220 Volts NOMINAL VOLTAGE OPERATING RANGE 10 5 of nominal 100 volts 126 voits 220 volts 240 volts 90 to 105 volts 408 to 126 volts 198 to 231 volts 216 to 252 volts Figure 2 1 Line Voltage Selection appropriate power cable is not inclu
43. o off out d Set the INPUT RANGE control to the appropriate meter range for the oscillator output level desired e Adjust the OSCILLATOR LEVEL control and LEVEL vernier until the desired output level is indicated on the meter 3 31 VU MEASUREMENTS 3 32 To measure volume units VU the meter response characteristics are changed to those of a VU meter by switching the METER RESPONSE switch to the VU position VU measurements can be made in the INPUT LEVEL or RELative LEVEL functions Measurement results are normally read on the dBm 600 ohms meter scale Operating procedures for making VU measure ments are the same as those listed for Normal Voltmeter Operation or Relative Level Operation 3 33 Filters 3 34 Three 60 dB decade active filters one high pass and two low pass are included to permit the user to eliminate unwanted frequencies and noise These filters may be selected individually or in any combination by means of the front panel FILTER switch The frequencies labeled beside each switch indicate the 3 dB roll off point of that particular filter 3 35 Input Ground Select 3 36 The ANALYZER Low input reference is selected by the INPUT GND SELECT switch When using the DISTORTION ANALYZER input the input low is connected to chassis ground center switch position or allowed to float right switch position When using the AM DETECTOR input left switch position the input low is connected to chassis ground
44. o the 10 volt range c Set the FREQUENCY controls fully counterclock wise d Set the OSCILLATOR LEVEL control and level vernier fully clockwise The meter should indicate more than 6 volts e Set the level vernier fully counterclockwise The meter should indicate less than 2 volts f Set the INPUT RANGE control to the 10 dBm range and adjust the level vernier for a 0 dBm meter indication blue scale g While observing the meter set the FREQUENCY controls to each dial position Allow time for the meter reading to stabilize at each setting The meter indication should not vary more than 0 6 dBm from the original setting h Set the FREQUENCY controls fora frequency of kHz i Adjust the level vernier for a meter indication 0 dBm j Simultaneously down range the OSCILLATOR LEVEL and INPUT RANGE controls to the next lower range The meter should indicate 0 dBm k Repeat Steps i and j for each position of the OSCILLATOR LEVEL control 3 50 AC VOLTMETER 3 51 The following procedure checks the ac voltmeter functions and ranges Perform the following steps 3 5 Section II a Set the FILTER switches off out the METER RESPONSE switch to NORMAL and the INPUT GND SELECT switch to the center position DIStortion ANalyzer with input low connected to chassis ground b Set the FUNCTION switch to INPUT LEVEL c Set the INPUT RANGE control to the 10 volt range d Set the FREQUENCY controls
45. re 2 19 Operating and Storage Temperature 2 20 In order to meet the specifications listed in Table 1 1 the instrument should be operated within an am bient temperature range of 0 C to 50 C 32 F to 122 F 2 21 The instrument may be stored or shipped where the ambient temperature range is within 40 C to 65 C 40 F to 149 F However the instrument should not be stored or shipped where temperature fluc tuations cause condensation within the instrument Model 339A 2 22 Humidity 2 23 The instrument may be operated in environments with relative humidity of up to 95 However the instrument must be protected from temperature extremes which cause condensation within the instrument 2 24 Altitude 2 25 The instrument may be operated at altitudes up to 4572 meters 15 000 feet 2 26 REPACKAGING FOR SHIPMENT NOTE If the instrument is to be shipped to Hewlett Packard for service or repair attach a tag to the instrument identifving the owner and indicating the service or repair to be accomplished Include the model number and full serial number of the instrument In any correspondence identify the instrument by model number and full serial number If you have any questions contact your nearest hp Sales and Service Office 2 27 The following is a general guide for repackaging the instrument for shipment If the original container is available place the instrument in the container with
46. s level by pressing the enter offset button The Spectrum Analyzer should indicate 00 00 dB f Set the FUNCTION switch of the 339A under test to DISTORTION g Adjust the DISTORTION RANGE control for an on scale meter indication as near full scale as possible h Determine the fundamental rejection of the 339A under test by adding the display reading of the Spectrum Analyzer and the distortion range setting of the 339A under test As an example If the 339A DISTORTION RANGE control is set to 80 dB and the Spectrum Analyzer display indicates 35 dB the fundamental rejection is 115 dB i The fundamental rejection level determined in the previous step must meet or exceed the specification listed in Table 4 6 j Step the Synthesizer frequency to the second harmonic frequency 4 9 Section IV Model 339A Table 4 6 Fundamental Rejection and Induced o The induced distortion measurement must meet or Distortion Test exceed the specification listed in Table 4 6 Fundamental Induced Test Rejection Distortion Frequency Specification Specification gt 100 dB gt 95 dB 30 kHz gt nes dB 50 kHz gt 90 B gt gt 85d8 dB 110 KHz gt gt 7008 dB p Set the FUNCTION switch of the 339A under test to INPUT LEVEL q Repeat Steps c through p for each frequency listed in Table 4 6 4 24 Distortion Measurement Accuracy Test Reree to QBA CAS ZAFRA E TE ON Spectrum Analyzer a Model 3044
47. t OSCILLATOR Frequency Range 10 Hz to 110 kHz in 4 overlapping decade ranges with 2 digit resolution Frequency vernier provides continuous frequency tuning between 2nd digit switch settings Output Level Variable from lt 1 mV to gt 3 V rms into 600 Q with 10 dB step LEVEL control and 10 dB VERNIER adjustment OSC LEVEL position on function switch allows a quick check of oscillator level without disconnecting leads to device under test OFF position on Oscillator LEVEL control provides fast signal to noise measurement capability Oscillator output terminals remain terminated in 6000 Frequency Accuracy 2 of selected frequency with FREQUENCY VERNIER in CAL position Level Flatness 20 Hz to 20 kHz 0 1 dB 10 Hz to 110 kHz 0 2 db Distortion 600 Q load lt 3 V output 10 Hzto 20 kHz 20 kHz to 30 kHz 30 kHz to 50 kHz 50 kHz to 110 kHz lt 95 dB 0 0018 THD lt 85 dB 0 0056 THD lt 80 dB 0 01 THD lt 70 dB 0 032 THD Output Resistance 6000 5 AM DETECTOR Frequeney Range Carrier frequencies 550 kHz to 1 6 MHz Modulation frequencies 20 Hz to 20 kHz Distortion introduced by AM Detector with 30 kHz filter switched IN Up to 85 Modulation lt 36 dB 1 6 THD 85 to 95 Modulation lt 30 dB 3 THD Input Level Maximum 60 V peak Modulation signal level 2 0 V rms minimum 10 V rms maximum Monitor Output with modulated RF carrier applied
48. t the output of the AC Calibrator to the 339A DISTORTION ANALYZER input DISTORTION MEASUREMENT SET hp Model 339A TRUE RMS VOLTMETER hp Model 3403C FREQUENCY TEST LIMITS 00104 00098 00102 00096 00104 00288 00312 00294 00306 00288 00312 0096 0104 0098 0102 0096 0104 0288 0312 0294 0306 0288 0312 096 104 098 102 096 104 288 312 294 306 288 312 96 1 04 98 1 02 96 1 04 2 88 3 12 2 94 3 06 2 88 3 12 9 6 10 4 9 8 10 2 9 6 10 4 28 8 31 2 29 4 30 6 28 8 31 2 96 104 98 102 96 104 288 312 294 306 312 110 kHz d The 339A I mV 10 Hz meter indication should be within the Test Limits listed in Table 4 1 e Using the AC Calibrator and High Voltage Amplifier verify the 339A Voltmeter accuracy for each Test Frequency Input Level and 339A Input Range listed in Table 4 1 4 12 Meter Tracking and Monitor Output Accuracy Test Equipment Required AC Calibrator hp Model 745A True RMS Voltmeter hp Modei 3403C AC CALIBRATOR hp Model 745A oO 9 cm g O wA O p 9 0 6 MONITOR ete OUTPUT ANA input Figure 4 2 Meter Tracking and Monitor Output Accuracy Test 4 2 Model 339A Section IV PULSE GENERATOR hp Mode 8011A Ve lio OSCILLOSCOPE n2 1nunununuurcccioo ni hp Model 1221A ey TRUE RMS VOLTMETER DE i
49. ting screw clockwise stop when pointer is exactly at zero e When pointer is exactly over zero rotate adjustment screw slightly counterclockwise to relieve tension on pointer suspension If pointer moves off zero repeat Steps c through e but make counterclockwise rotation less 3 7 3 8 Model 339A Section IV SECTION IV PERFORMANCE TEST 4 1 INTRODUCTION 4 2 This section contains performance test procedures which can be used to verify that the Model 339A meets the specifications listed in Table 1 1 All tests can be performed without access to the interior of the instrument A simpler operational verification procedure included in Section III may be used to check the operational capability of the 339A The operational procedures do not however check specified accuracy of the instrument 4 3 EQUIPMENT REQUIRED 4 4 The test equipment required for the performance tests is listed at the beginning of each procedure and in the Recommended Test Equipment Table in Section I If the recommended equipment is not available any equipment that meets the critical specifications given in the table may be substituted 4 5 TEST RECORD 4 6 A Performance Test Record is included at the end of this section for your convenience in recording performance data This record may be removed from the manual and used as a permanent record of the incoming ti AA ee AA AMPLIFIER AC CALIBRATOR hp Mode 745A
50. to AM Detector input 1 3 Section Model 339A Table 1 1 Specificatons Contd Distortion mode Provides scaled presentation of demodulated input signal after fundamental is removed Voltmeter and Relative Input mode Provides scaled presentation of demodulated input signal Output Voltage and Output Resistance are the same as in Distortion mode Table 1 2 Typical Operating Characteristics RESTA RNA GE IT RI E LT Lg NOTAIO NOT SITE SURE ee ea Sl GENERAL Operating Environment Temperature O C to 50 C Humidity Range lt 95 O C to 40 C Storage Temperature 40 C to 65 C Power 100 17 20 220 240 5 10 40 to 66 Hz 200 mA max Weight Net 8 2 kg 18 ibs shipping 11 3 kg 25 Ibs Dimensions 426 mm wide x 146 mm high x 442 mm deep 16 75 wide x 5 75 high x 17 4 deep Table 1 3 Recommended Tesi Equipments Instrument Critical Specification AC Calibrator Frequency 10 Hz 110 kHz Output Level 1 mV 300 V rms Level Accuracy 2 Output Impedance 500 True RMS Voltmeter Frequency Range 10 Hz 110 kHz Voltage Range 1 mV 10V rms Measurement Accuracy 5 Measurement Resolution 1 of full scale Crest Factor 24 Puise Output Amplitude 10 V p p Pulse Width Variable 1 msec 10 usec Repetition Rate 100 Hz 10 kHz Pulse Generator Bandwidth DC 2 MHz Sweep Time 1 us 5 sec div Sensitivity
51. trum Analyzer i Step the Synthesizer frequency to the second harmonic frequency of the 339A output j The amplitude of the second harmonic frequency relative to the fundamental frequency is determined by adding the Spectrum Analyzer display reading and the range setting of the Notch Filter As an example If the Notch Filter distortion range control is set to 80 dB and the Spectrum Analyzer display indicates 23 dB the amplitude of the second harmonic is 103 dB relative to the fundamental Record the amplitude reading of the second harmonic k Step the Synthesizer frequency to the frequency of the third harmonic 1 Determine the relative amplitude of the third harmonic by adding the Spectrum Analyzer display reading and the range setting of the Notch Filter Record the amplitude reading of the third harmonic 4 7 Section IV Model 339A TUNEABLE NOTCH FILTER hp Model 339A SPECTRUM ANALYZER hp Model 3044A DISTORTION MEASUREMENT SET hp Model 339A 600 N LOAD hp 11095A Figure 4 8 Oscillator Total Harmonic Distortion Test m Calculate the Total Harmonic Distortion using the graph shown in Figure 4 9 As an example If the amplitude of the second harmonic is 110 dB and the third harmonic amplitude is 114 dB the dB difference between the two is 4 dB Locate this number on the horizontal axis of the graph The 4 line intersects the curve at approximat
52. utput impedance Test FREQUENCY VERNIER CAL OSCILLATOR wwii carn 43 ei iratis 3 V b Connect the equipment as shown in Figure 4 6 without the 600 ohm load i c Adjust the True RMS Voltmeter controls to measure AC volts on the 10 V range d Adjust the 339A LEVEL vernier control to obtaina reading of 6 00 V on the True RMS voltmeter e Disconnect the cable from the True R MS Voltmeter and install the 600 ohm load as shown in Figure 4 6 f The True RMS Voltmeter reading must be between 2 927 and 3 077 V rms 4 18 Oscillator Frequency Accuracy Tesi Equipment Required DISTORTION MEASUREMENT SET hp Model 339A O80080 Frequency Counter hp Model 5300A Mainframe 5302A Frequency Module 600 ohm Resistive Load hp 11095A a Set the 339A controls as follows FREQUENCY 3a 10 Hz 1 0 x 10 FREQUENCY VERNIER CAL OSCILLATOR LEVEL cgil 3 V Table 4 3 Oscillator Output Limits Fiatness Test Quiput Output Frequency Level FREQUENCY COUNTER hp Modei 5300A Mainframe hp Modei 5302A Frequency Module 600 N LOAD hp 11095A Figure 4 7 Oscillator Frequency Accuracy Test 4 6 Model 339A Table 4 4 Oscillator Frequency Accuracy Test 339A Frequency Range Setting Frequency Counter Indication Period Frequency 102 04 mSec 98 04 mSec X10 51 020 mSec 49 019 mSec 20 408 mSec
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