Tenma 72-7210 Manual
Contents
1. Output Range 1 Display 2 Accuracy 2 MIN MAX Resolution 7mHz 500mHz 1mHz No Specified 0 5Hz 5 Hz 0 01Hz 3 2 5 Hz 50 Hz 0 1Hz 50 Hz 500 Hz 1Hz 0 3 1 0 5k Hz 5k Hz 0 001kHz 0 03 1 5 kHz 50 kHz 0 01kHz 50kHz 500 kHz 0 1kHz 500kHz 5 MHz 0 001MHz Notes 1 2 The specification is specified within 10 to 100 of maximum output range and the waveform characteristics are limited to the specified range also The display resolution and accuracy is relative to the span of internal counter Waveform Characteristics Triangle Wave Linearity Frequency Linearity 1Hz 100KHz gt 98 gt 100 KHz No Specified Sine Wave Distortion Distortion Harmonic ratio 10Hz 100kHz 100kHz 500kHz 0 5MHz 5MHz lt 2 lt 30dB lt 20dB Notes 1 The distortion isn t specified for less than 10 Hz Square Wave Transition time Aberration lt 50ns 5 of P P am plitude 50 mV Output Characteristics Amplitude Load MIN CCW MAX CW Attenuator Flatness Attenuator ON Attenuator OFF 1kHz lt 500 kHz 0 5 5 MHz No 0 2Vp p 2 20Vp p 20dB 1dB 1dB 3dB Load 50 Q 0 1Vp p 2 10Vp p Notes 1 Output impedance is 5004 10 100kHz 2 The amplitude should consider additional tolerance of flatness 3 FCCW Full counterclockwise FCW Full clockwise 4 Output prote2. Press EXT COUNTER switch on front panel Connect external source sine waveform 10MHz amplitude of 10 mV rms Connect a probe to TP600 and to the scope Adjust R610 for a square wave display on the scope Remove the probe from TP600 then adjust C104 for counter reading to 10 0000 10 0002 MHz Function adjustment of Triangle wave Set this FG controls as follows FUNCTION TRIANGLE AMPLITUDE MAX DC OFFSET OFF FREQUENCY 5 KHz SYMMETRY OFF SWEEP OFF Set the FG controls as follows FUNCTION SQUARE AMPLITUDE MAX DC OFFSET OFF FREQUENCY 5 KHz SYMMETRY OFF Adjust R340 for a symmetrical square wave around zero Frequency Adjustment Connect the OUTPUT to an external counter Set the FG controls as follows FUNCTION TRIANGLE AMPLITUDE Middle DC OFFSET OFF Turn the FREQUENCY control knobs to full CW and select the proper RANGE for a reading of gt 5 2 KHz on the display Adjust R259 for a 50 symmetry waveform Turn the FREQUENCY control knob CCW and set the frequency to 100 Hz on the 17 OO JO display counter It is important to stay in the same range Adjust R249 for a 50 of symmetry waveform Repeat steps 5 and 6 for best results on both ends Select the Frequency range from 5Hz to 50 OHZ Connect the output to an external counter Tum the frequency knob to full CW position Adjust R211 for a frequency reading t
3. s l ik man sal bek ak ii k 4 O tp t CharacteriStiCS ssenari n kk ab e ka kk ak kib da kb kn 5 Other Inputs and Outputs io awa io ok a io a on kk l a ok oak pa kk kb ni pa 6 ee Eer 7 Section 4 GETTING STARTE E 9 Front AVG ie aaa e aj e e an ak ke a pa e n e ae a a kn a e on pen A ERE look balan 9 PLE ANE EN E 11 Preparing For 8 5 38 et a a a ste 12 Reference Operation DEE 13 Section 5 MAINTENAN e 15 ST NEE 15 Section 6 ADJUSTMENT PROCEDURES u u u u u vdcsc senere reen 16 Required teste quipm ent E 16 lge WE ME 17 Section 1 SAFETY Review the following safety precautions to avoid injury and prevent damage to this instrument or any instruments connected to it Read this manual carefully to ensure your personal safety and to prevent damage either to the instruments or to equipment connected to them Before applying power ensure that the line selector is in the proper position for power source being used Make sure that the power cord and the fuse type rating is specified for this product before use This product is grounding through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making any connections to the input terminals of the products ensure that the properly grounded To avoid personal injury never operate the instrument without covers or panels removed To prevent product overheating provide proper ventilation Do not operat
4. The main output will sweep the desired range of frequencies according to the input level of SWEEP in out BNC Observe the results on the oscilloscope 14 Section 5 MAINTENANCE A WARNING To avoid electrical shock or damaging this instrument never get water into the meter Cleaning Before cleaning this instrument make sure the power is switched in OFF position and the power cord is disconnected from the AC outlet To clean the meter wipe the dirty parts with gauze or soft cloth soak with diluted neutral detergent Avoid getting the instrument too wet to prevent the detergent from penetrating into inside parts and causing damages After cleaning leave the instrument until it dries completely Don t use chemicals containing benzine benzene toluene xylene acetone or similar solvents A WARNING The following instructions are for qualified personnel only To avoid electrical shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so When serving use only specified replacement parts as described hereinafter To avoid electric shock disconnect the power cord from the unit before changing fuse or input voltage selector Selecting different input voltage amp protection fuse replacement 1 To select different input voltage level of AC 100V 120V 220V or 240V simply switch to the selected voltage so the desired voltage is displayed in the windo
5. for 100k Hz output Adjust R309 for minimum distortion and lt 1 2 To check frequency range for 50 Hz If the distortion gt 1 2 to adjust steps 3 7 again Adjust R314 for a symmetrical waveform around zero 18 FTENMA rue 405 Pioneer Blvd Springboro Ohio 45066 http www tenma com 19
6. under test e Do not exceed the voltage rating of the circuit being powered 12 Reference Operation This section describes several advanced functions of the Tenma 72 7210 function generator The variety of swept available from the function generator make it especially useful for such applications as test servo system or amplifier response distortion and stability It can use for FM generator frequency multiplication or as a variable beat frequency oscillator The synchronous and sweep outputs can be used as a source for TTL logic or to synchronize as external device such as an oscilloscope Main output Connect the Main output connector to the input BNC connector on an oscilloscope Switch off the external counter button Select the waveform by pushing function selector Push UP DOWN to select a range of frequency output Turn the frequency knob to adjust the frequency output The output value will be indicated on the display Turn the amplitude knob to adjust the output level The attenuator switch can be pushed to attenuate the output level for 20 dB if necessary 7 Push DC offset switch to the ON position an additional DC level will be used to shift output level The knob of DC offset is used to adjust DC level aon D Symmetry Follow the operation of Main output but with the symmetry button switched ON The frequency will be divided ten from the original frequency output around Turn the knob of symmetry to adj
7. FSET KNOB SWITCH The switch is set at OFF position for normal operation The knob sets the DC level and therefore the polarity of the OUTPUT signal after the switch ON SWEEP RATE Rotate the Knob to adjust the sweep rate Adjusts how often the frequency sweep reiterates 7 SWEEP SWITCHES The ON switch is used to enable sweep function The STOP switch is used to see the stop frequency 8 STOP FREQ KNOB This knob is used to adjust the sweep width Adjusts the range of frequency that is traversed by each sweep 9 EXT COUNTER INPUT External signal input BNC The input frequency is from 5Hz to 50MHz 10 EXT COUNTER SWITCH Push the switch to ON for external counter 11 FREQUENCY KNOB Rotate this knob to set the desired frequency output of generator 12 SYNC OUT BNC This connector sends out synchronous signal of TTL level the output frequency is same as MAIN output 13 SWEEP IN OUT BNC Sweep signal output and input connector It will be an output connector when you push the SWEEP switch ON otherwise it is an input connector which is voltage control frequency VCF 14 WAVE SELECTOR Push the switch to select the output waveforms 15 AMPLITUDE KNOB Adjust the voltage within the presently selected range Rotate this knob to adjust the voltage level of main output signal OUTPUT BNC 16 ATTENUATOR Push the switch to turn attenuator ON 17 OUTPUT BNC Main output of function generator 10 Rear Panel In addit
8. TENMA ET User s Manual 5MHz SWEEP FUNCTION GENERATOR SYMMETRY CO MHz CD KHz Ca Hz OFF POWER CO mHz OFFSET ON EXT COUNTER PE SWEEP IN IN OUT TIL SY SWEEP STOP un MAX STOP FREQ MAX AMPLITUDE OUTPUT amp 500 20Vp p 5MHz SWEEP FUNCTION GENERATOR SYMMETRY TO MHz _ ABABAB Ef we OFF POWER Lome ol FREQUENCY EXT COUNTER TTL lt 5V OFFSET STOP A MIN MAX STOP FREQ MIN MAX AMPLITUDE OUTPUT amp son 20Vp p http www tenma com TENMA 72 7210 5 MHZ FUNCTION GENERATOR INSTRUCTION MANUAL REVISION HI STORY 2004 05 10 Ee Copyright Statement Copyright Tenma All rights reserved No part of this publication may be reproduced in any form or by any manner or used to make any derivative such as translation transformation or adaptation without our authorization and permission All the Trademarks belong to their respective proprietors CONTENTS Section 1 SAFETY E 1 Section 2 INTRODUCTION ME 2 S6 ction 3 SPECIFICATION E 3 General Specifications E 3 El etricalS le EE 4 E ak TE A Waveform Characteristics ki aien si kk se is n
9. ction The generator main output is non destructively protected against short circuit to ground or to any voltage practically available in electronic laboratories DC Offset Load DC Offset Knob 1 Ripple 2 FCCW FCW No Load lt 10V gt 10V lt 10mVp p 50Q lt 5V gt 5V Notes 1 Set the switch of DC OFFSET to ON position and set the function switches of Sine Triangle and Square to OFF position Then test the DC offset 2 Before testing ripple set the frequency range to lowest range and turn frequency knob to MIN position Otherwise it will induce noise around 50mVp p based on different frequency Other Inputs and Outputs Synchronous Output Output Output level Transition time Fan out 2 Impedance 50 Q typical 1 TTL level gt 3V lt 30 ns Typical 20 TTL open circuit loads Notes 1 The output Impedance is measured at 1kQ load or above 2 The capability of fan out depends on different TTL logics and the level is greater than 2V Symmetry Range Symmetry Knob FCCW FCW Up to 500kHz lt 10 2 90 Notes 1 Symmetry from 10 to 90 at full output amplitude terminated into 50Q External Sweep IN Impedance Sweep Range Sweep Ratio 1 14K Q typical 0 2Hz 100Hz 1 100 Notes 1 The frequency output will be proportional to the level of SWEEP IN connector 0 5V input for up to 100 1 frequency change approxima
10. e this product in wet damp or explosive atmosphere Marking on the instruments Caution referring to manual for detailed instructions Protective conductor terminated It B gt Section 2 INTRODUCTION This Function Generator FG produces low distortion combined with a 6 digit high resolution 50MHz counter It is a rugged easy to operate excellent heat dissipation and high stability instrument The FG range is from 0 01 Hz to 5 MHz with 8 ranges You can also directly control amplitude and DC offset The sweep function makes the output signal traverse a range of frequency The START and STOP frequency control is setting for the sweep rate and sweep width internally The sweep function can be input from an external DC signal This FG has a frequency counter to count the signal frequency from 5 Hz to 50 MHz The frequency counter features one six digit display with automatic decimal point placement and LED indicator that show the measuring units It provides high input impedance and good sensitivity for all specified frequency The symmetry function provides the user to vary the duty of frequency When you push the switch of symmetry ON the output waveform symmetry is adjustable The sweep IN function provides external voltage source to control the output frequency The output frequency can be swept above or below the selected frequency to a maximum of 100 1 depending on the amplitude of input and the selected output fr
11. equency The exceptional accuracy its portability and stackable design makes the Tenma 72 7210 Function Generator an ideal instrument for using by the electronic engineer the communication technician schools and laboratories Section 3 SPECIFICATION General Specifications Display Six digits of seven segment LED Output Sine Square Triangle DC Sync and Sweep Input Sweep IN External frequency counter Warm up time At least two hours Operating Temperature Storage Temperature 0 C 40 C 32 F to 104 F 10 C to 60 C Altitude Up to 2000 M Relative Humidity Up to 80 for 0 C to 28 C Up to 70 for 28 C to 40 C Dimension 261 x 71x 211 mm WxH xD Weight 1 8Kgs approx Line Voltage AC 100V 120V 10 50 60Hz FUSE 0 4A 250V AC 220V 240 10 50 60Hz FUSE 0 2A 250V Power consumption 40VA maximum Ventilation Always keep the back of instrument far away the wall for better ventilation and nothing at among Standard Accessories User Manual in CD ROM Power cord Safety Designed in compliance with EN61010 1 IEC1010 1 Installation Category II Pollution Degree 2 Environment EMC Designed in compliance with EN61326 Electrical Specification The accuracy is given as of span No of least significant counts at 23 C 5 C with relative humidity less than 80 R H Main Output Range Sine Triangle Square Waves
12. ion to line voltage selector fuse and power cord receptacle Figure 2 Rear Panel VENTILATION FAN Always keep nothing on the front of fan for better ventilation 2 POWER CORD SOCKET LINE VOLTAGE SELECTOR AND FUSE HOLDER To select line voltage and fuse replacement 11 Preparing for Use PRECAUTIONS In order to avoid damaging this instrument make sure that the unit is set to the correct line voltage for your area Also make sure that the correct fuse is used for the line voltage These line voltages are 100V 120V 220V and 240V at 50 60HZ A WARNING To avoid damage the equipment use only specified fuse when change the power line voltage Please refer to following table SELECTOR LINE VOLTAGE FUSE 100V 92 110V 50 60Hz 0 4A 120V 108 132V 50 60Hz 0 4A 220V 198 242V 50 60Hz 0 2A 240V 216 264V 50 60Hz 0 2A Avoid touching the rear panel of the instrument during operation The heat sink is nearby the rear panel contacting it could result in skin burns e Avoid using the function generator in ambient temperatures above specified Always keep sufficient air space between the rear of instrument and wall to prevent internal heat build up Although the function generator is protected against reverse polarity damage the circuit being powered may not include such protection Always carefully observe polarity incorrect polarity may damage the equipment
13. o 52 0Hz on the external counter 10 Turn the frequency knob for an internal counter reading to 50 0Hz Adjust R637 for a display of 50 0 0 1Hz 11 Turn the frequency knob to 10Hz reading on the counter Adjust R638 for a display reading of 10 0Hz 0 1Hz 12 Repeat steps 10 and 11 for best result on both ends 13 Select the Frequency Range from 500KHz 5MHzZ Rotate the frequency knob to full CW Adjust C217 for a reading gt 5 3MHz 14 Turn the frequency knob to full CCW adjust R262 for a reading of 30 5 KHz ENDOU Output amplitude Adjustment Terminate the output in 50 ohms and connect an oscilloscope and a multi meter to the output With all function pushbuttons out and the knob of AMPLITUDE control at full CW position adjust R401 for output of OV 10 mV Set the amplitude control to full CW position and select triangle waveform Check for a peak amplitude of gt 10 2V Set frequency to 5KHz and adjust R225 for a symmetrical around zero waveform Function adjustment of Sine wave Connect a distortion analyzer through a 50 ohms termination to the OUTPUT and monitor with an oscilloscope also Set the FG controls as follows FUNCTION SINE AMPLITUDE MAX DC OFFSET OFF FREQUENCY 50Hz SYMMETRY OFF Set frequency range to 50 Hz and FREQ Knob for 50 Hz output Adjust R320 and R309 for minimum distortion and lt 1 2 Set frequency range to 500kHz and FREQ Knob
14. pedance 1MQ typical The counter display will be 0 Hz with 500 load on no signal input The maximum input voltage lt 42Vpk Section 4 GETTING STARTED Front Panel Figure 1 shows the front panel controls connectors and indicators of FG 1 2 3 4 5 6 7 8 Li SYMMETRY OFFSET SMHz SWEEP FUNCTION GENERATOR SWEEP LI A few VO YA hh PENN N ZATNNAN f AA ow 1 II Ce JA j Jij N a H H H H H g e RANGE WEY AREY 7 VEY r VOI d OFF PO R JE ne N a MIN MAX MIN AX l LI gt ON ON RATE STOP STOP FRE Ji Ni FREQUENCY da HI so TR LI A NA SYNC SWEEP Ss Nh ie ai 2008 OUTPUT WI WY N A Vs LI MIN J 18 A MIN MAX de NE V a AMP ITUDE II Ge S Figure 1 Front Panel POWER SWITCH To toggle instrument power ON and OFF Counter READOUT A six digit display that shows frequency generator or external counter The LED indicates the frequency units of MHz KHz Hz or mHz for the counter readout The decimal point and unit is automatically placed in the appropriate position RANGE BUTTONS Push buttons of UP DOWN to set the frequency range of the output signal The frequency range will be 10 times difference on each step SYMMETRY KNOB SWITCH The knob is used to vary either positive pulse ramp or negative pulse ramp Push the symmetry switch to ON before rotating this knob DC OF
15. tely To avoid damage to this instrument ensure that the maximum voltage into this BNC is no more than 10 Vp 2 Turn off the Sweep ON switch Internal Sweep Sweep OUT Impedance Sweep Rate Output Level MIN MAX MIN MAX 600 Q gt 5s lt 10 ms gt 0 3V 4 5 typical Notes 1 The output level of SWEEP OUT BNC is proportional to the knob of STOP FREQ 2 The frequency knob is set to full CCW for start frequency and Set the knob of stop frequency to full CW The STOP switch is used to indicate stop sweep frequency The sweep width is variable up to 100 1 frequency change approximately 6 Counter Characteristics Internal Counter Range Display Resolution 1 Accuracy 7mHz 500 mHz 1mHz No Specified 0 50Hz 5 00Hz 0 01Hz 3Yo 2 5 0Hz 50 0 Hz 0 1Hz 1 999 Hz 1 Hz 0 3 1 1 000 9 999 kHz 0 001 kHz 0 03 1 10 00 99 99 kHz 0 01kHz 100 0 999 9 kHz 0 1 kHz 1 000 5 000 MHz 0 001MHz Notes 1 The display resolution of internal counter is according to the ranges of main output setting External Counter Range Resolution Accuracy 2 Input Sensitivity 5 5 999 Hz 1 Hz Time base error 20mV RMS 1 999 999 kHz 0 001 kHz se OU 1 20 0000 MHz 0 0001 MHz Time base error 1 count gt 20 50 MHz 0 0001 MHz 60 mV RMS Notes 1 Time base 10 MHz Ol i Time base error 10 PPM at 23 5 C Input im
16. ust duty cycle from 10 to 90 Observe the results on the oscilloscope eoa SYNC OUTPUT 1 Connect the SYNC output connector to the input BNC connector on an oscilloscope 2 The level and symmetry will be a constant value but the frequency will follow the Main output Please refer to main output for frequency change 3 The knobs for DC offset and amplitude do not affect the output 4 Observe the results on the oscilloscope Internal Sweep Sweep OUT 1 Connect the Main output connector to the CH1 BNC connector on the oscilloscope 2 Connect the SWEEP in out BNC to the CH2 BNC connector on the oscilloscope 3 Turn the frequency knob to set desired sweep start frequency 4 Turn the stop frequency knob to set stop frequency Push the STOP switch to the ON position to see the stop sweep frequency on the display Turn off the STOP switch once you finished the setting Push the sweep switch to the ON position The main output will sweep the desired range of frequencies and the BNC sweep is output a linear level 7 Turn the sweep rate knob to set how often the frequency sweep reiterates 8 Observe the results on the oscilloscope oo External Sweep IN 13 Aa aN gt D Push the sweep switch to the OFF position Connect the Main output connector to the CH1 BNC connector on the oscilloscope Connect the SWEEP in out BNC to another function generator Turn the frequency knob to set desired sweep start frequency
17. w Please make sure that the protection fuse rating matches 2 When replacing fuse or selecting the input voltage please use fuse ratings as specified For Service and repair and calibration please contact your local Tenma distributor or go to http Awww tenma com 15 Section 6 ADJUSTMENT PROCEDURES CAUTION The Following instructions are for qualified service personnel only To avoid electrical shock do not perform any servicing other than contained in the operation instructions unless you are qualified to do so Before calibrating and adjusting make sure that the instrument has warmed up for at least 2 hours Required test equipment The following Table lists the test equipment necessary to perform the adjustments and the maintenance of this instrument Any equipment that satisfies the critical specifications given in the table may be substituted for the recommended model Instrument Type Required Specifications Oscilloscope 100 MHz bandwidth dual channel DVM 4 5 digits true RMS Counter 100 MHz 2 CH time interval capability Distortion Analyzer 10 Hz 100 KHz 0 1 Function Generator 10 MHz frequency Feed through termination 50 ohm Cable Assembly BNC BNC 50 ohms RG 58 BNC Adapters BNC to banana BNC tees 16 Start to Adjust A Frequency Counter 10 MHz Oscillator Adjustments 1 2 Adjust R225 for a symmetrical around zero waveform C Function adjustment of Square wave 1
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