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20MHz Dual Trace Oscilloscope with Function Generator MODEL: GOS-620FG 820S-620FGMB CONTENTS PAGE 1. PRODUCT INTRODUCTION.................000020000000000000080 00000000 RR RS Ren sn nennen essen PREFPPEREFRERER 1 IS nennen Ene ene eee See sen REE SEE ROE Eee nennen sn 1 1-2.Feature................ssss cence eee eee nee инета RA 1 2. TECHNICAL ЗРЕСПТСАЛТОМ......... они они оон ни воно о оп ооо оо они овеень в 3 3. PRECAUTIONS BEFORE OPERATION ..............cccccccccccccceesseccccecsvevcssccccensnees 7 3-1. Unpacking the instrument....................................sssssssseeneerensenesereeeneenennse 7 3-2.Checking the Line Voltage... 7 3-3. Environment.......-z.sssssserersuenssnsnnenenenonnnuonsnennennnnnnnnnsnsssnenenennnnensnnennenennnnnenenenn nn neueren nunnnn 8 3-4.Equipment Installation and Operation.....................................ssesesseereeees 8 3-S.CRT Intensity..........cccccceccceccscnnenesensesteneeeeeeteeee иене nenn 8 3-6.Withstanding Voltage of Input Terminals.................................. scene 8 4. PANEL МТВОРОСТТОМ........ инь оконное иене ото ово иво о ооо ооо ооо оне оное 9 4-1. Front Panel..................22sssserenorenoonenenonenecnsnonnunnsonennsenennenneununnunsnen нео пион ооо они ие вооон nant tees 9 4-2.Rear Panel... ниикиинии ния наи нити ти ниве этот аа ен ин и вооон ово ковки нию ни оо ве ово ооо ви о изо оон нию они 9 CONTENTS PAGE 5. OPERATION METHOOD..............ccccccccesecevuceccceevsccessceususevecccuessncecessesesseseees 17 S-1.Basic ОрегаНопП......... ccc ccc cccececncceccnecseecustecsauencueescusenseneesueeensveceesusetevasnesenceeeesneeecesees 17 5-2.Dual-channel Operation... sce cuctecetenceceseeuusesusevaneusveeeccececsesessecsnaeevcceesveceengens 19 5-3.ADD ОрегаНопП........ нии наити незнания ина т зна на винит твеа зи ия зе няни, 20 S-4.Triggering........................ низине ин етики наи зи кучи они вона о визави зави ну тии заза аи за нина юньви 22 5-5.TIME/DIV Сопи`о|...... „нение зу nar sms из вона з тина ниеевье 23 5-6.Sweep МарпсаНопП........ линии нии ши нина знании назниньн 23 5-7.X-Y Operation... 2... .ccccccccecscceneeecceececeecesereceteeeesueecnseuuueecseeeseeesaceneensceenveeeevesessceeesaeenes 24 5-8.СаЙЬгаНоп...... зоне ин икать нок ини езин анна ззн азиз зв воза новин о зи паз заново веет ни тюнина 25 5-9.0С BAL Адуи$&тепе........ нина наи инвазии изза ниния 25 S-10.Function Generator... нии ани визави наивна зи изу ати а ина и шине 25 6. MAINTENANCE........... error козни ввоз о овен о ню воно зововень vo seceesceesees see cecceeecrenns 26 6-1.Fuse Керасетепе........... ини ии ани низине знании ви из еча чина нини ни, 26 6-2.Line УоКаре......... нее н унии нии нау н я унив вони и ка nooo narra rro nn оон за вазе rr ион иное звзваави и нашенан 26 6-5.Cleaning..............,.,..,. нии ини нина накипи виз вниз нии ини изза вв и они ню инея 27 7. BLOCK DIAGRAM. ..............ccccecccesccectecnnceeeccseusceusseuscceusaeessessccetcceeveesess 28 — mi — SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product: WARNING. Warning statements identify condition or practices that /\ could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that /\ could result in damage to this product or other property. The following symbols may appear in this manual or on the product: À À © + DANGER ATTENTION Protective Frame or chassis High Voltage refer to Manual Conductor Terminal Terminal NOTE This lead/appliance must only be wired by competent persons WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this lead are coloured in accordance with the following code: Green/ Yellow: Earth Biue: Neutral Brown: Live(Phase) ОЕ й Of FOR UNITED KINGDOM ONLY As the colours of the wires in main leads may not correspond with the colours marking identified in your plug/appliance, proceed as follows: The wire which ts coloured Green & Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol © or coloured Green or Green & Yellow. The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black. The wire which is coloured Brown must be connected to the termina! marked with the letter L or P or coloured Brown or Red. If in doubt, consult the instructions provided with the equipment or contact the supplier. This cable/appliance should be protected by a suitably rated and approved HBC mains fuse : refer to the rating information on the equipment and/or user instructions for details. As a guide, cable of 0.75mm? should be protected by a ЗА or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used. Any moulded mains connector that requires removal/replacement must be destroyed by removal of any fuse & fuse carrier and disposed immediately, as a plug with bared wires is hazardous if a engaged in live socket. Any re-wiring must be carried out in accordance with the information detailed on this label. EC Declaration of Conformity We GOOD WILL INSTRUMENT CO., LTD. (1) NO. 95 - 11, Pao Chung Rd., Hsin-Tien City, Taipei Hsien, Taiwan (2) Plot 522, Lorong Perusahaan Baru 3, Prai Industrial Estate, 13600 Prai, Penang, Malaysia declare that the below mentioned product GOS-620FG are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (89/336/EEC,92/3 1/EEC, 93/68/EEC) and Low Voltage Equipment Directive (73/23/EEC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive, the following standards were applied: Conducted Emission EN 55022 class B (1994) Il Electrostatic Discharge | TEC 1000-42 (1995) Radiated Emission EN 55011 class В (1991) Radiated Immunity IEC 1000-4-3 (1995) Current Harmonics EN 61000-3-2 (1996) Electrical Fast Transients (IEC 1000-4-4 (1995) Voltage Fluctuations EN 61000-3-3 (1995) Surge Immunity IEC 1000-4-5 (1995) ——— Conducted Susceptibility [EN 61000-4-6 (1996) ---------- ---------- Power Frequency Magnetic field [EN 61000-4-8 (1993) ——— nn Voltage Dip/Interruption IEN 61000-4-11 (1994) 5 Low y Voltagel Directive EN 61010-1: 1:4993)+ A2; (1995) | 1. PRODUCT INTRODUCTION 1.1 Description The GOS-620FG oscilloscope + Function Generator is a portable-type, dual-channel oscilloscope with function generator. Its bandwidth of DC is up to 20MHz, and its maximum sensitivity is ImV/DIV. The time base provides a maximum sweep time of 0.2uS/DIV. The sweep speed becomes 100nS/DIV after magnifying 10 times. The oscilloscope uses a 6-inch rectangular type cathode-ray tube with red internal graticule. The Function Generator generates triangle. wave, sine wave, and square wave with the frequency range from 0.1Hz to 1MHz. The product is sturdy, easy to operate and exhibits high operational reliability. 1.2 Features 1) High intensity CRT with high acceleration voltage: The CRT is a high beam transmission and high intensity type with a high acceleration voltage of 2kV. It displays readable traces clearly even at high sweep speeds. 2) Wide bandwidth and sensitivity: In addition to wide bandwidth, DC-20MHz (-3dB), the instrument provides high sensitivity of SmV/DIV (1mV/DIV at X 5 MAG). A 20MHz frequency is obtained with improved triggering synchronization. 3) Alternate triggering: Even with an observation of two different frequency waveforms, each waveform can be triggered stably. 4) TV sync triggering: The oscilloscope has a sync separator circuit for TV-V and TV-H signals triggering. 5) CHI Output: A signal from 50Q output terminal of CHI located on rear panel can be applied to frequency соищег`ог other instruments. 6) Z-Axis Input: Intensity modulation capability permits time or frequency markers to be added. Trace blank with positive signal, TTL compatible. 7) X-Y operation: Set the switch to X-Y to operate the instrument as an X-Y oscilloscope. CHI can be applied as a horizontal deflection (X-axis) while CH2 provides vertical deflection (Y-axis). 8) Built-in Function Generator with BNC output of 500. 9) Three kinds of waveforms are available with 50(2 output. 10)Waveform frequency is up to 1 MHz. 2. TECHNICAL SPECIFICATIONS VERTICAL AXIS MODEL SPECIFICATIONS GOS-620FG 20MHz OSCILLOSCOPE + FUNCTION GENERATOR 1.OSCILLOSCOPE Sensitivity 5mV ~ 5V/DIV, 10 steps in 1-2-5 sequence. Sensitivity Accuracy <3% ( x 5 MAG : <5%). Vernier Vertical sensitivity To 1/2.5 or less of panel-indicated value. DC ~20MHz ( x SMAG: DC~7MHz). Frequency bandwidth AC coupling: Low limit frequency of 10Hz. (With reference to 100kHz, 8DIV. Frequency response at -3dB). Rise time Approx. 17.5nS (x5 MAG: Approx. 50nS). Input impedance Approx. IM ohm // Approx. 25pF. Square Wave Characteristics Overshoot : < 5% ( At 10mV/DIV range). Other distortions and other ranges: 5% added to the above value. DC Balance Shift Panel adjustable. Linearity <+0.1DIV of amplitude change when waveform of 2 DIV at graticule center is moved vertically. Vertical modes CHI : CHI single channel. CH2 :CH2 single channel. DUAL : CHI and CH2 are displayed. ALT or CHOP selectable at any sweep rate. ADD : CHI + CH2 algebraic addition. Chopping Repetition Frequency Approx. 250kHz. Input Coupling AC, GND, DC. Maximum Input Voltage 300Vpeak (AC: frequency 1kHz or lower). Set probe switch at 1: 1, the maximum effective readout is 49Vpp (14Vrms at Sine wave), set probe switch at 10: 1, the maximum effective readout is 400Vpp(140Vrms at Sine wave). Common Mode Rejection Ratio 50:1 or better at 50kHz sinusoidal wave. (When sensitivities of CHI and CH2 are set equally). Isolation between channels (At 5mV/DIV range) >1000:1 at 50kHz. >30:1 at 20MHz. CHI signal output At least 20 mV/div into a 50 (0 terminal, Bandwidth is 50Hz to SMHz at least. CH2 INV BAL. Balanced point variation: <! DIV (Reference at center graticule). — 3 — GOS-620FG 20MHz OSCILLOSOPE + FUNCTION GENERATOR MODELS PECIFICATIONS CHI, CH2, LINE, EXT (CHI and CH2 can be selected only in the DUAL or ADD vertical mode). Triggering source In ALT mode, if the TRIG. ALT switch is pushed in, it can alternate triggering of two different source. Coupling AC: 20Hz to full bandwidth. Slope + / -. 20Hz ~ 2MHz: 0.5 МУ. TRIG-ALT:2 DIV, EXT : 200mV. Sensitivity 2 ~ 20MHz :1.5 DIV, TRIG-ALT:3 DIV, EXT : 800mV. TV : Sync pulse more than 1 DIV (EXT: IV). TRIGGERING |Triggering modes AUTO _ : Sweeps run in the free mode when no triggering input signal is applied. (Applicable for repetitive signals of frequency 25Hz or over.). NORM _ : When no triggering signal is applied, the trace is in the ready state, but not displayed. TV-V __: This setting is used when observing the entire vertical picture of television signal. TV-H _ : This setting is used when observing the entire horizontal picture of television signal. (Both TV-V and TV-H synchronize only when the synchronizing signal is negative ) EXT Triggering Signal Input Input Impedance Max. Input Voltage Approx.: IM ohm // approx. 25Pf. 300V (DC+AC peak), AC: Frequency not higher than 1kHz. HORIZIONAL AXIS Sweep Time 0.24 Sec ~ 0.5 Sec/DIV, 20 steps in 1-2-5 sequence. Sweep Time Accuracy 13%. Vernier Sweep Time Control <1/2.5 of panel-indicated value. Sweep Magnification 10 times (maximum sweep time 100nSec/DIV). x10MAG Sweep Time Accuracy + 5%, (20nSec ~ 50nSec are uncalibrated). Linearity + 3%, x10MAG: + 5% (20ns and 50ns are uncalibrated). Position shift caused by x10MAG Within 2 div. at CRT screen center. X-Y MODE Sensitivity Same as vertical axis (X-axis:CHI input signal; Y-axis:CH2 input signal.). Frequency Bandwidth DC to at least 500kHz. X-Y Phase Difference <3°at DC ~50kHz. FICATION MODEL SPECIFICATION GOS-620FG 20MHz OSCILLOSCOPE + FUNCTION GENERATOR Sensitivity 5 Vp-p (Positive-going signal decreases intensity). Frequency Bandwidth DC ~ 2MHz. Z AXIS Input resistance Approx. 47K ©. Maximum Input Voltage ¡30V (DC+AC peak, AC frequency<1kHz). Waveform Positive-going Square wave. Frequency Approx. 1 kHz. CALIBRATION [Duty Ratio Within 48:32. VOLTAGE Output Voltage 2 Vp-p 12%. Output Impedance Approx. ГКО. Type 6-inch rectangular type. internal graticule. Phosphor P 31. Acceleration Voltage Approx. 2kV. CRT Effective Screen Size 8 x 10 DIV (1 DIV = 10mm (0.39ın)). Graticule Internal. Trace Rotation Provided. 2.FUNCTION GENERATOR Output Function Range 0.1Hz ~ IMHZ (7 steps). Output Waveform Sine Wave. Square Wave and Triangle Wave. Frequency Variable Range 10:1 or more. Output Impedance 500 = 10%, Output Voltage Over 20Vp-p (open circuit) continuous conversion. DC offset possible over + 10V when opened. Sine wave Distortion 1% Max. (10Hz ~ 20kHz). (Specification applied from Max to — level) Square wave Unsymmetry Square wave Rise/Fall Time + 3% or less (in [KHz maximum). 50Q output: 120nS or less. | MODEL SPECIFICATION GOS-620FG 20MHz OSCILLOSCOPE + FUNCTION GENERATOR 3.GENERAL Power Source ACI15V, 230V = 15% selectable, 50Hz or 60Hz. Power Consumption Approx. 45VA, 40W(max.) Operation Environment Indoor use Altitude up to 2000 m Ambient temperature : To satisfy specifications :10° to 35°C (50° to 95° F) Maximum operating ranges: 0° to 40°C (32 °to 104° F) Relative humidity: 85% RH(max.) non condensing Installation Category П Pollution degree 2 Storage Temperature & Humidity -10° to 70°C. 70%RH(maximum). Power cord x 1 Instruction manual x 1 Accessories Probes K 2 GTL-101 x 1 Dimensions 310 (W) x 150 (H) x 455 (D) mm. Weight Approx.8kgs (17.6lbs). 3. PRECAUTIONS BEFORE OPERATION 3.1 Unpacking the instrument The product has been fully inspected and tested before shipping from the factory. Upon receiving the instrument, please unpack and inspect it to check if there is any damages caused during transportation. If any sign of damage is found, notify the bearer and/or the dealer immediately. 3.2 Checking the Line Voltage The product can be applied any kind of the line voltage shown in the table below. Before connecting the power plug to an AC line outlet, make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage. It might be damaged the instrument if connected to the wrong AC line voltage. WARNING. To avoid electrical shock, the power cord protective grounding conductor must be connected to ground. The fuse must be changed following after the line voltage shown as below: Line voltage Range Fuse Т 0.63A AC 115V 97~132V 250V T0.315A AC 230V 195-250V 250V /\ WARNING. To avoid personal injury, disconnect the power cord before removing the fuse holder. 3.3 Environment The normal ambient temperature range of this instrument is from 0° to 40°C (32° to 104°F). To operate the instrument over this specific temperature range may cause damage to the circuits. Do not operate the instrument in a place where strong magnetic or electric field exists as it may disturb the measurement. 3.4 Equipment Installation and Operation Ensure there is proper ventilation for the vent of the instrument. If it is not according to the specification to operate the instrument, the protection provided by the instrument may be impaired. 3.5 CRT Intensity To prevent permanent damage to the CRT phosphor, do not let the CRT trace brighten excessively or leave the spot stay for an unreasonable long time. 3.6 Withstanding Voltages of Input Terminals The withstanding voltages of the instrument input terminals and probe input terminals are shown in the following table. Do not apply voltage higher than the specification. When set probe switch at 1: 1, the maximum effective readout is 40Vp-p (14Vrms at Sine wave), set probe switch at 10: 1, the maximum effective readout is 400Vp-p (140Vrms at Sine wave). Input terminal Maximum input voltage CHI, CH2, inputs _300УреаКк | CAUTION. To avoid any damage, do not EXT TRIG IN input | 300Vpeak apply exceeding maximum input voltage of the Probe inputs 600Vpeak frequency less than 1 kHz to the instrument. Z AXIS input 30Vpeak If an AC voltage which is superimposed on a DC voltage is applied, the maximum peak value of CHland CH2 input voltages must not exceed +300V, so is the AC voltages with a mean value of zero voltage, the maximum peak to peak value is 600Vp-p. 4.PANEL INTRODUCTION O Fig. 4-1. Front Panel GS) @ 3) (4949 OW PO GPO 25) (a | [El insrek” ou din ro 00S- 6206 » м Fon 7 mia TA | a TRIGGER => À 0: © 3 ОЕ O ER В ЕО f eE о о 00 © 0600000000000 00 Da N O Fig. 4-2 Rear Panel ГЕ] НЕЕ А мп Z-AXIS INPUT 30Vpk MAX. — r o ZA. WARNING O 10 AO ELECTRIC SHOCK THE POWER CORD PROTECTNE GROUNDING CONDUCTOR MUST BE CONNECTED TO CROUNO. CH1 OUTPUT FOR CONTINUED FIRE PROTECTION. REPLACE ONLY WITH SPECIFIED 20m¥/0N INTO SO 9 ТРЕ AND RATED FUSE, NO OPERATOR SERVICCABLE COMPONENTS INSIDE. 00 NOT REMEME | COVERS. REFER РИСК TD QUALFIED PERSONNEL J О © en IE /25pF CAT Ir A ENSURE THE POWER IS REMOVED FROM 300Vpk THE INSTRUMENT BEFORE REPLACING THE FUSE MAX. —— 115 ЕЕ (| Г ею | ви mn OT SÉLECTION (50/60H2) ET (O) ore 1952504 TOJIA C € N > 25% ZN prety e POWER MAX. 40 WATTS, 45VA HAHAHA HE at SOV cal HE N HE lEC+010 2504 СА U ET | ® © 10 4-1.Front Panel CRT: (6) POWER Main power switch of the instrument. Turn on the switch to light the LED (5). (2). INTEN Control the brightness of the spot or trace. (3) FOCUS Focus the trace to the sharpest image. (4) TRACE ROTATION Semi-fix potentiometer for aligning the horizontal trace in parallel with graticule lines. (33)FILTER The filter is easy for waveform viewing. Vertical Axis: (8) CHI (X) input The vertical input terminal of CHI is X-axis in X-Y operation, (20)CH 2 (Y) input The vertical input terminal of CH2 is Y-axis in X-Y operation, (10) &(18)AC-GND-DC Select connection mode between input signal and vertical amplifier. AC AC coupling GND Vertical amplifier input is grounded and input terminals are disconnected. DC DC coupling (7) & (22)VOLTS/DIV Select the vertical axis sensitivity from SmV/DIV to 5V/DIV with 10 ranges totally. (9) & (21)VARIABLE Fine adjustment of sensitivity with a factor of >1/2.5 of the indicated value. The sensitivity is calibrated to specific value in the CAL position. When this knob is pulled out (x5 MAG state), it will multiply 5 by the amplifier sensitivity. (13) & (17)CH1 & CH2 DC BAL. The knobs are used for adjusting the attenuator balance. See page 20 DC BAL adjustments for details. (11)&(19)* ” POSITION Vertical positioning control of trace or spot. (14)VERT MODE ‘Select operation modes of CH 1 and CH 2 amplifiers. CH 1 Operate the oscilloscope as a single-channel instrument by selecting СН] alone. CH 2 Operate the oscilloscope as a single-channel instrument by selecting CH2 alone. DUAL Operate the oscilloscope as a dual-channel instrument by selecting CH! and CH2. ADD The oscilloscope displays the algebraic sum (CH1 + CH2) or subtraction (CHI - CH2) of the two signals (the subtraction function effects only when push in CH2 INV(16) button). (12)ALT/CHOP When this switch is released in the dual-trace mode, the CHI and CH2 inputs are alternately displayed (normally used at faster sweep speeds). When this switch is depressed in the dual-trace mode, the CHI and CH2 inputs are chopped and displayed simultaneously. (normally used at slower sweep speeds). (16)CH2 INV When press CH2 INV button, it will inverts the CH2 input signal in CH2 and in ADD MODE, the CH2 trigger signal pickoff is also inverted. (23)SOURCE Select the internal triggering source signal, and the EXT TRIG IN input signal. CH1 Press key DUAL or ADD of VERT MODE (14), select CHI to get internal triggering source signal CH2 Press key DUAL or ADD of VERT MODE (14), select CH2 to get internal triggering source signal (27)TRIG.ALT Set VERT MODE switch (14) in DUAL or ADD key, select the SOURCE switch (23) by pressing СН] or CH2, then press TRIG.ALT switch(27), the internal triggering source signal will display alternately from CH1 and CH2. LINE Display the triggering signal from AC power line frequency signal. EXT Obtain the external triggering source signal by applying external signal to EXT TRIG IN input terminal (24). (26)SLOPE Triggering slope button. “+” Triggering occurs when the trigger signal crosses the trigger level by positive-going course. e” Triggering occurs when the trigger signal crosses the trigger level by negative-going course (28)LEVEL Display a synchronized stationary waveform and set a start point for the waveform. Toward “+” The trigger level moves upward on the display waveform. Toward “-” The trigger level moves downward on the display waveform. (25)TRIGGER MODE Trigger mode selection. AUTO Ifno trigger signal applied or the trigger signal frequency is less than 25Hz, the sweep will be in the free run mode. NORM _ If no trigger signal applied and sweep is in a stand-by state, there will be no trace appear. TV-V Used for observing entire vertical picture of television signal. TV-H Used for observing entire horizontal picture of television signal. (Both TV-V and TV-H synchronize only when the synchronizing signal is negative.) Time Base: (29) TIME/DIV Provide sweep time ranges from 0.2 uS/div to 0.5 S/div with 20 steps totally. X-Y Use the instrument as an X-Y oscilloscope by setting to X-Y position. (30)SWP.VAR Vernier control knob of the sweep time used when CAL and the sweep time is calibrated to the value preset in TIME/DIV. The sweep of TIME/DIV can be varied continuously when shaft is not in CAL position. Rotate the control knob to CAL position and the sweep time is calibrated to the preset value of the TIME/DIV. Counterclockwise rotate the control knob to the bottom to delay the sweep by 2.5 time or more. (32) 4 ? POSITION Adjust the trace or spot in horizontal position. (31)x 10 MAG Magnify 10 by pressing this key. Function Generator: (39)GENERATOR OUTPUT The main output terminal with 50 (2 output impedance. (40) WAVEFORM SELECTOR The waveform change following after each button pushing in Sine wave, Triangle wave, and Square wave sequence. (44) OUTPUT WAVEFORM DISPLAY Display the current output waveform. (42)FREQ RANGE Switch: The frequency range changes following after each button pushing in 1M, 100k, 10k, 1k, 100, 10, and 1 sequence. (43)FREQUENCY RANGE DISPLAY Display the current frequency range. (44)FREQUENCY Knob Rotate the knob clockwise to get higher frequency and reverse the rotation of knob to get lower frequency. (45)AMPLITUDE/DC LEVEL Adjustment Knob Rotate outside knob clockwise to get higher amplitude and reverse the rotation of knob to get lower amplitude. The inside knob ts for DC Level adjustment, it works only when the knob being pulled up. Pull up the knob and rotate it clockwise to get positive DC Level, and reverse the rotation of knob to get negative DC Level. Others: (1) CAL This terminal delivers the calibration voltage of 2 Vp-p, 1kHz, positive square wave. (15)GND Ground terminal of oscilloscope mainframe. 4-2.Rear Panel Triggering: (24)EXT TRIG IN Input Terminal Input Terminal is used for external triggering signal by setting SOURCE switch (23) to the EXT position. (34)Z AXIS INPUT Input terminal for external intensity modulation signal. (35)CH1 SIGNAL OUTPUT Delivers a voltage of approximately 20mV/DIV from the CHI signal to 50(2 terminal for frequency counting. AC POWER Input Circuit: (36)AC Power input connector Connect the AC power cord (supplied) to this connector. (37)FUSE & line voltage selector Fuse rating is shown in Page 7 Line voltage selector to select power sources. (38)Studs Studs is not only used as a stand for laying the oscilloscope on its back to operate it in the upward posture, also used for winding up the power cord. 5.OPERATION METHOD 5-1.Basic Operation---Single-channel Operation Before connecting the power cord to an AC line outlet, make sure that the AC line voltage input switch on the rear panel of the instrument is correctly set for the AC line voltage. After ensuring the voltage setting, set the switches and controls of the instrument as shown below: Item No Setting Item No Setting POWER (6) Disengage position(OFF ) SLOPE (26) + INTEN (2) Mid-position TRIG. ALT (27) Released FOCUS (3) Mid-position TRIGGER MODE (25) AUTO VERT MODE _|(14) CHI TIME/DIV (29) 0.5mSec/DIV ALT/CHOP (12) Released(ALT) SWP.VER (30) CAL position CH 2 INV (16) Released € > POSITION (32) Mid-position 2 % POSITION |(11)(19) | Mid-posttion x10 MAG (31) Released VOLTS/DIV (7)(22) | 0.5V/DIV VARIABLE (9Q1) | CAL(clockwise position) AC-GND-DC — {(10)(18) | GND SOURCE (23) CHI 17 — After setting the switches and control knobs as mentioned, connect the power cord to the AC line outlet, then follow the procedure describes as follows: 1) Press the POWER switch and make sure that the power LED is turned on. In about 20 seconds, a trace will appear on the CRT screen. If no trace appears in about 60 seconds, counter check the switch and control setting. 2) Adjust the trace to an appropriate brightness and image with INTEN and FOCUS control knob respectively. 3) Align the trace with the horizontal central line of the graticule by adjusting the CH1 POSITION control knob and TRACE ROTATION control knob(adjusted with screwdriver). 4) Connect the probe to the CH] INPUT terminal and apply 2Vp-p CALIBRATOR signal to the probe tip. 5) Set the AC-GND-DC switch to AC, a waveform will be displayed on the CRT © FIG. 5-1 screen as shown in the figure 5-1. 6) Adjust the FOCUS control knob to trace image sharply. 7) Display the signal waveform clearly by adjusting the VOLTS/DIV switch and TIME/DIV switch to appropriate position. 8) Adjust the ^ ” POSITION and * ? POSITION control knobs to appropriate position to align the waveform with the graticule, so that voltage (Vp-p) and period (T) can be read conveniently. The descriptions above are the basic operating procedures for CHI single-channel operation of oscilloscope. So is CH2 single- channel operation. For further operation methods will be explained in the subsequent paragraph. 5-2.Dual-channel Operation Set the VERT MODE switch to DUAL to display trace in СН? (The procedure is ® Fig. 5-2 same as CHI described in previous section). At this step, the calibrator signal appears in CHI is Square wave, but it appears in CH2 is a straight line as no signal applied to this channel yet. не’ F7 Now, apply the calibrator signal to the vertical input terminal of CH2 through the — I НУ | signal of CH! probe with the same procedure as for CHI. Set the AC-GND-DC switch to AC, eT ET ET and adjust vertical POSITION knobs (11) and (19), the signals will be displayed on both channels as shown in Figure 5-2. pf Signal of CH2 When ALT/CHOP switch is released (ALT MODE), the input signals which applied respectively to CHland CH2 appears on the screen alternately at each sweep. This setting is used when the sweep time is short in 2-channel observation. When ALT/CHOP switch is pressed (CHOP MODE), the input signals which applied to CH Land СН? are chopped and display on the screen at the same time with the frequency of 250kHz. This setting 1s used for low speed sweep. Set to dual channel operation (DUAL or ADD mode), select CHI or CH2 signal from SOURCE switch to get triggering source signal. If both CHI and CH2 signals are in a synchronized relation, both waveforms will be displayed in stationary states. If not, only a signal stationary waveform will be appeared. If press TRIG. ALT push button, both waveforms can also be displayed in Stationary states. 5-3 ADD Operation An algebraic sum of the CHI and CH2 signals can be displayed on the screen by setting the VERT MODE switch to ADD. The displayed signal will be difference between CHI and CH2 if press CH2 INV push button. Adjust ^ Y POSITION knob of CHI or CH2 can make vertical position, to the advantage of the linearity of the vertical amplifiers, it’s better to set “ Y POSITION knob of both channels in middle position. 5-4.Triggering Proper triggering is essential for an efficient operation of the instrument. Users must make themselves familiar with the triggering functions and procedures thoroughly: (1)Functions of MODE switch: AUTO Select automatic sweep operation by setting to AUTO mode, the sweep generator will freely generate a sweep without a trigger signal. However, it will automatically switch to triggering sweep operation if an acceptable trigger source signal is preset. The AUTO mode is handy for observing the waveform when first set up the instrument, as it provides sweep function for waveform observation until properly set to other mode. Once starting to set the control mode, the operation often jumps back to the NORM trigger mode as it is much more sensitive. Automatic sweep must be used for DC measurements and signals with low amplitude in order not to trigger the sweep. NORM The NORM mode provides normal triggering sweep operation. The sweep will not act until the selected trigger source signal crosses the threshold level set by TRIG LEVEL control knob. The triggering generate one sweep which will come to inactivate until another triggering occurs. In the NORM mode, there will be no trace unless an adequate trigger signal is present. In the ALT mode of dual trace operation with NORM sweep selected, there will be no trace unless both CH! and CH2 signals are adequate for triggering. TV-V Set the MODE switch to TV-V mode, select vertical sync pulses for sweep triggering to view composite video waveforms. Select vertical sync pulses as a triggering to view vertical fields and frames of video. A sweep time of 2 ms/div is appropriate for viewing fields of video and 5 ms/div for complete frames (two interlaced fields) of video. — 20 — TV-H Set the MODE switch to TV-H mode and select horizontal sync pulses for sweep triggering to view composite video waveforms. Select horizontal sync pulses as a triggering to view horizontal lines of video. A sweep time of about 10 us/div is appropriate for displaying lines of video. Display the exact number of desired waveforms by setting SWP VAR control knob. This oscilloscope synchronizes with only (-) polarity, that is, the sync pulses are negative and the video is positive as shown in Fig. 5-3. © = Fig. 5-3 (2)Functions of SOURCE switch: Apply the displayed signal itself or a trigger signal, which has a time relationship with the displayed signal, to the trigger circuit to display a stationary signal on the CRT screen. The SOURCE switch is used for selecting these trigger sources. CH1 CH2 LINE EXT The internal trigger source is used most commonly. The signal applied to the vertical input terminal is branched off away from the preamplifier and is fed to the trigger circuit through the VERT MODE switch. Since the trigger signal is the measured signal itself, a stable waveform can be readily displayed on the CRT screen. When in the DUAL or ADD operation, the selected signal through the SOURCE switch is used as a trigger source signal. The AC power line frequency signal is used as a trigger signal. This method is effective when the measured signal has a relationship with the AC line frequency, especially for measurements of low level AC noise of audio equipment, thyristor circuits, etc. The sweep is triggered by an external signal applied to the external trigger input terminal. An external signal which has a periodic relationship with the measured signal is used. Because the measured signal is not used as the triggering signal, the waveforms can be displayed more independent than the measured signal. — 7 — (3)Functions of TRIG LEVEL control knob and SLOPE button: A sweep triggering is developed when the trigger source signal crosses a preset threshold level. Rotate TRIG LEVEL control knob to vary the threshold level. In the “+” direction, the trigger threshold shifts to a more positive value, and in the “- “ direction, the trigger threshold shifts to a more negative value. When set the control knob in the center, the threshold level will be on the average of the signal used as the trigger source. Adjust TRIG LEVEL contro! knob for the desired start point of sweep on a waveform. On sine wave signals, the phase at which sweep begins is variable. Note that if rotate TRIG LEVEL control knob toward its extreme “+” or “-”, no sweep will be developed in the NORM trigger mode because the trigger threshold exceeds the peak amplitude of the sync signal. When set TRIG SLOPE button to the (+) position (up), the sweep is developed form the trigger source waveform as it crosses the threshold level in a positive-going direction. When set TRIG SLOPE button to the (-) position (down), a sweep triggering is developed from the trigger source waveform as it crosses the threshold level in a negative-going direction. The slope (polarity) trigger signal as shown in Figure 5-4. o Fig. 5-4 Slope "+" Range Level (4) Function of TRIG ALT button: | The TRIG ALT button is used to select alternate triggering and display the selected DUAL-trace of VERT MODE (the switch control knob CHI, CH2, DUAL and ADD modes). In the alternate trigger mode (when select dual-trace operation), the trigger source alternates between CH1 and CH2 with each sweep. This is convenient for checking amplitudes, wave-shape, or waveform period measurements, and even permits simultaneously observing two waveforms which are not related to frequency or period. However, this setting is not suitable for phase or timing comparison measurements. For such measurements, both traces must be triggered by the same sync signal. If press both CHOP and TRIG ALT buttons during dual-trace operation, synchronization of the display is not possible because the chopping signal will be triggered. Use ALT mode itself, or select CHI or CH2 as trigger source. — 22 — 5-5. TIME/DIV Control Set the TIME/DIV switch to display the desired number of cycles of the waveform. If there are too many cycles displayed with good resolution, set to increase the sweep speed. If only a line is displayed, try to slow down the sweep speed. When the sweep speed is faster than the observed waveform, only part of it will be displayed, which may appear as a straight line for a Square wave or Pulse waveform. 5-6.Sweep Magnification When a certain part of displayed waveform is needed to be O FIG. 5-5 expanded timewise, a faster sweep speed may be used. However, if the required portion is apart from the starting parra rr point of the sweep, it may run off the CRT screen. In this TATA HA case, push the х10МАС button to expand 10 times the uuu YUL displayed waveform from the right to the left in the center 10 x magnificatioo of screen. The sweep time with the magnification operation 1 . PITITFMITTT IS as follows. | a, rn [5 ЕЕ | (Value indicated by TIME/DIV switch) x 1/10 | CEE fe nun! [TI T Г 4 1 T Г corro gen . . (1111 Thus, the unmagnified maximum sweep speed (InSec/DIV) Any part <an be covered by can be increased with the magnification as follows : means of POSITION control 1 uSec/DIV x 1/10 = 100nSec/DIV 5-7.X-Y Operation O FIG. 5-6 Set the TIME/DIV switch to X-Y position to operate the Y axis (CH2) instrument as an X-Y oscilloscope. Each input is applied to the instrument as follows X-axis signal (horizontal axis signal ) : CHI INPUT. Y-axis signal (vertical axis signal) :CH2 INPUT. X axis (CHI) Note: When high frequency signals are displayed in X-Y operation, pay attention to the frequency bandwidth and phase difference between X and Y-axis. The X-Y operation permits the oscilloscope to perform many state-of-the-art measurements which the conventional sweep operation could not make. The CRT display becomes an electronic graph of two instantaneous voltages. The display may be a direct comparison of the two voltages such as a vectorscope display of video color bar patterns. However, the X-Y mode can almost be used in graph of any dynamic characteristic if a transducer is adopted to change the characteristic (frequency, temperature, velocity, etc.) of voltage. One common application is frequency response measurements that the Y-axis corresponds to signal amplitude and the X-axis corresponds to frequency. 1. Set the TIME/DIV control knob to the X-Y position (fully counterclockwise), CH1 becomes the X-axis input and CH2 becomes the Y-axis input. 2. Adjust X and Y positions by using the horizontal € > POSITION and CH2 * У POSITION control knobs respectively. 3. Adjust the amount of vertical (Y-axis) deflection by using CH2 VOLTS/DIV and VAR control knobs. 4. Adjust the amount of horizontal (X-axis) deflection by using CHI VOLTS/DIV and VAR control knobs. 5-8.Calibration of Probe As explained previously, the probe makes up a wide range attenuator. Unless phase compensation is properly done, the displayed waveform will be distortion causing measurement errors. Therefore, the probe must be properly compensated before use. Connect 10:1 probe BNC to the INPUT terminal of CHI or CH2 and set VOLTS/DIV switch at 50mV. Connect the probe tip to the calibration voltage output terminal and adjust the compensation trimmer on probe for optimum Square wave (minimum overshoot, rounding off and tilt). o FIG. 5-7 (a) Correct compensation (b) Over compensation (c) Insufficient compensation 5-9.DC BAL Adjustments The ATT balance of the vertical axis can be adjusted easily. (1)Set the input coupling switches of CHI and CH2 to GND and set the TRIG MODE to AUTO, then position the base line to the center. (2)Adjust the VLOTS/DIV switch to SmV-1!0inV and fix the line does not move. 5-10.Function Generator The instrument also provides the basic features of Function Generator to satisfy general demand with simply and intuitional operation method by adjusting the control knobs directly from front panel for output waveform, amplitude, DC level and etc. All the control knobs located in front panel are marked with the same color to prevent missetting. 6. MAINTENANCE [WARNING | The following instructions are executed by qualified personnel only. To avoid electrical shock, do not perform any servicing other than the operating instructions unless you are qualified to do so. 6-1.Fuse Replacement If the fuse blows, the power lamp indicators will not light and the instrument will not start. The fuse holder should not normally be opened unless a problem has been caused to the unit. Try to determine and correct the cause of the blown fuse and replace with a fuse of correct rating and type (see page 7 ) on the rear panel (see fig. 4-2). WARNING. For continued fire protection. Replace fuse only with 250V fuse of the specified type and rating, and disconnect power cord before replacing fuse. 6-2 Line Voltage Conversion The primary winding of the power transformer is tapped to permit operation from 115V, or 230VAC 50/60Hz line voltage. Conversion from one line voltage to another is done by changing the line voltage selector switch as shown in Fig. 4-2. The rear panel identifies the line voltage to which the unit was factory set. To convert to a different line voltage, perform the following procedure: (1)Make sure the power cord is unplugged. (2)Adjust the line voltage selector switch to the desired line voltage position. (3)A change in line voltage may also require a corresponding change of fuse value. Install the correct fuse value as listed on rear panel. 6-3 Cleaning To clean the instrument, use a soft cloth dam pened in a solution of mild detergent and water. Do not spray cleaner directly onto the unit because it may leak into the cabinet and cause damage. Do not use chemicals containing benzine, benzene, toluene, xylene, acetone, or similar solvents. Do not use abrasive cleaners on any portion of the oscilloscope. 7.BLOCK DIAGRAM CH1 SINGAL OUTPUT с CH1 (X) Q= INPUT HAT Loa Hi FUNCTION PREAMP GENERATOR 4 CHI > \ VERT VERT MODE VERTICAL > TRIG (AUS) \ h PICK? AMP SIGNAL | SWITCH OUTPUT AMP > CH2 (Y) Г] INPUT cm SWITCHING RAT EA pREAMP LOGIC 4 А HV = Z-AXIS CRT ~ AMP CIRCUIT Z-AXIS TRIG TRIG CH2 SIGNAL SWITCH INPUT TRIG PICKUP AMP HV. « L SUPPLY X-AXIS SIGNAL LOT чо» mis TRIG (A) SWEEP HORIZONTAL HORIZONTAL > INPUT AMP GENERATOR bl GENERATOR SWITCHING OUTPUT AMP > CH2 me Lg 4 —— FREE RUN TO EACH POWER AC LINE EXT AUTO HER воск ©] suPPLY 50/60 Hz © »O circu Г < = LINE 2Vp-p/t Kite 7 SQuaREwave O 777] CALIBRATOR LINE TRIG ">

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