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30MHz Dual Trace Oscilloscope
Model 72-6802
USER MANUAL
This manual contains proprietary information, which is protected by copyrights. All rights
are reserved. No part of this manual may be photocopied, reproduced or translated to
another language without prior written consent of Tenma Test Equipment.
The information in this manual was correct at the time of printing. However, Tenma
continues to improve products and reserves the rights to change specification, equipment,
and maintenance procedures at any time without notice.
Tenma Test Equipment
405 S. Pioneer Blvd. Springboro Ohio, 45036
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Summary of Contents for Tenma 72-6802
- Page 1 No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Tenma Test Equipment. The information in this manual was correct at the time of printing. However, Tenma continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.
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Page 2: Table Of Contents
TABLE OF CONTENTS 72-6802 User Manual APPENDIX ....................37 Table of Contents Line Voltage & Fuse Replacement ......37 Specifications .............. 39 Declaration of Conformity ........... 41 SAFETY INSTRUCTIONS ................5 PRODUCT OVERVIEW .................. 10 Product Description .............10 Main Features..............11 Block Diagram ............... 12 PANEL OVERVIEW .................. -
Page 3: Safety Instructions
SAFETY INSTRUCTIONS 72-6802 User Manual Safety guidelines General • Never connect a hazardous live voltage to the AFETY INSTRUCTIONS Guideline ground side of the BNC connectors. It might lead to fire or electric shock. CAUTION • Do not place heavy objects on the instrument. • Avoid severe impacts or rough handlings that This chapter contains important safety instructions lead to damaging the instruments. that you must follow when operating and storing this instrument. Read the following instructions • Do not discharge static electricity onto the before operating the instrument to ensure your instruments. safety and to keep it in best condition. • Use only mating connectors, not bare wires, for the terminals. Safety symbols • Do not block the cooling fan opening. These safety symbols may appear in this manual or on the • Do not perform measurements at power instrument. ... - Page 4 (Measurement categories) EN 61010-1:2001 specifies the measurement categories and • Use a soft cloth dampened in a solution of mild their requirements as follows. The 72-6802 falls under category II. detergent and water. Do not spray any liquid • Measurement category IV is for measurements performed at the source of low- voltage installations. into the instrument. ...
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Page 5: Product Overview
SAFETY INSTRUCTIONS 72-6802 User Manual Power cord for the United Kingdom When using the instrument in the United Kingdom, make sure the RODUCT OVERVIEW power cord meets the following safety instructions. 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... -
Page 6: Main Features
PRODUCT OVERVIEW 72-6802 User Manual Main Features Block Diagram High intensity The CRT incorporates high beam transmission, high intensity, and a 2kV high acceleration voltage. The CRT displays clearly readable traces even at acceleration higher sweep speeds. Wide In addition to the DC‐30MHz (‐3dB) wide bandwidth and bandwidth, the oscilloscope provides a 1mV/DIV high sensitivity. The 30MHz frequency range is sensitivity obtained by an improved triggering synchronization. Frequency A built‐in 5‐digit frequency counter offers ±0.02% Counter accuracy between 1kHz and 30MHz, and ±0.05% between 50Hz and 1kHz. Automatic Pressing the AUTO TIMEBASE key automatically timebase adjusts the sweep time to an appropriate range. adjustment Alternate Even when observing two waveforms in different triggering frequencies, both waveforms can be stably triggered using the alternate triggering mode. ... -
Page 7: Panel Overview
PANEL OVERVIEW 72-6802 User Manual Trigger Controls the trigger mode, trigger level, trigger Controls coupling source, trigger slope, and alternate triggering mode. Accepts the external trigger input. Input Accepts the CH1 and CH2 input signals and ground ANEL OVERVIEW Terminals wire. Controls the input signal coupling mode. Display Controls Front Panel Overview 1 CAL Output Generates the probe compensation signal; 2Vp‐p, 1kHz, positive square wave. For probe compensation details, see page26. 2 INTEN Knob Controls the brightness of a light spot or trace in the display. 3 FOCUS Controls the focus (sharpness) of the waveforms in Detailed descriptions of each block start from the next page. Knob the display. Main Display Shows the waveforms of input signals. ... -
Page 8: Lcd Display
PANEL OVERVIEW 72-6802 User Manual LCD Display Horizontal Controls 1 Horizontal Controls the horizontal position of traces and light 1 CH1 POSITION Shows the CH1 vertical scale. spots. Vertical Knob Scale 2 ×10 MAG Magnifies the horizontal scale by a factor of 10. For 2 Horizontal Switch Shows the horizontal scale. horizontal magnification details, see page34. Scale 3 SWP VAR Adjusts the horizontal scale. 3 X-Y Mode Knob When turned on, indicates that the X‐Y mode is At the minimum position, the horizontal scale ... -
Page 9: Vertical Controls
PANEL OVERVIEW 72-6802 User Manual DUAL The CH1 and CH2 signals are displayed Vertical Controls simultaneously. ADD The CH1 and CH2 signals are added or subtracted, and then the result is displayed. For CH1/CH2 addition/subtraction details, see page32. 5 VAR Knob Adjusts the vertical scale. At the minimum position, the vertical scale becomes 2.5 times wider than the original value selected by the VOLTS/DIV knob. For example, if the original scale is 1mV/DIV, the adjusted scale becomes 2.5mV/DIV. 1 VOLTS/DIV Controls the CH1/CH2 vertical scale from At the maximum (CAL) position, there is no Knob 1mV/DIV to 5V/DIV in 12 steps. change in the vertical scale. 2 Vertical Controls the vertical position of traces and light 6 CH2 INV Inverts the CH2 input signal vertically. When the POSITION spots for CH1/CH2. ... -
Page 10: Trigger Controls
PANEL OVERVIEW 72-6802 User Manual TV-V The oscilloscope triggers when a Trigger Controls vertical video synchronization signal appears. For triggering on the field, select 2ms/DIV as the horizontal scale; for triggering on the frame (two interlaced fields), 5ms/DIV. TV-H The oscilloscope triggers when a horizontal video synchronization signal appears. For triggering on the line, select 10us/DIV as the horizontal scale. Use the SWP VAR knob to control the number of waveforms. Note • For TV‐V and TV‐H trigger, the 1 Trigger ALT When pressed, the TRIG ALT switch constantly oscilloscope responds only to Switch toggles the trigger source between CH1 and CH2 negative polarity signals. signal, so that both signals can be clearly viewed. The TRIG ALT switch works when the vertical mode is in the DUAL position and also the trigger source is in the CH1 or CH2 position. • The oscilloscope cannot trigger Note •... -
Page 11: Input Terminals
PANEL OVERVIEW 72-6802 User Manual 4 Trigger Selects the triggering slope. Input Terminals SLOPE When in the “+” position ( ), the oscilloscope Switch triggers when the positive slope of the trigger source signal crosses the trigger level. When in the “–” position ( ), the oscilloscope triggers when the negative slope of the trigger source signal crosses the trigger level. 1 CH 1 (X) Accepts the CH1 input signal. In X‐Y mode, the Input CH1 input signal becomes the X‐axis. Terminal 2 AC/GND/ Selects the coupling mode for the input signal. DC Switch 5 Trigger Selects the signal on which the oscilloscope sweeps. The oscilloscope block DC components SOURCE included in the input signal. ... -
Page 12: Rear Panel Overview
PANEL OVERVIEW 72-6802 User Manual Rear Panel Overview ETUP Default Settings Before powering up the oscilloscope, set up the front panel as follows. POWER Switch Off 1 FUSE & Line Holds the AC mains fuse and selects the AC line INTEN Knob Center Voltage voltage, 115V or 230V. Selector FOCUS Knob Center 2 AC Power Accepts the AC power cord. Input Vertical MODE CH1 Connector... -
Page 13: Set Up & Probe Compensation
SETUP 72-6802 User Manual CH1/CH2 CAL Set up & Probe Compensation VARIABLE Knob Follow these steps and properly set up the oscilloscope, make sure it CH1/CH2 AC is functional, and compensate the probe. Coupling Switch Power on Press the Power switch and turn on the oscilloscope’s power. The Trigger CH1 LED lights when the power is on. SOURCE Switch The trace line starts to appear after Trigger SLOPE 20 – 30 seconds. + (Positive slope) Switch Intensity Use the INTEN knob and FOCUS TRIG ALT Released (alternating trigger and focus knob to adjust the trace line ... -
Page 14: Measurement
SETUP 72-6802 User Manual Vertical Use the CH1 VOLTS/DIV knob adjustment and CH1 vertical POSITION knob to adjust the vertical scale and EASUREMENT position of the waveform. Horizontal Use the CH1 TIME/DIV knob and adjustment CH1 horizontal POSITION knob to adjust the horizontal scale and Single Channel (Basic) Measurement position of the waveform. Steps 1. Connect the input signal to the CH1 or CH2 terminal. Probe Adjust the compensation point on the probe so compensa- that the waveform becomes square. 2. Select the vertical coupling tion between AC (DC components are blocked) or DC (all signal components appear). 3. Configure the trigger settings. For details, see page19. Under compensation... -
Page 15: Dual Channel Measurement
MEASUREMENT 72-6802 User Manual 6. If necessary, use the TIME/DIV Dual Channel Measurement knob to adjust the horizontal scale manually. Use the Steps horizontal POSITION knob to 1. Connect both CH1 and CH2 adjust the position of the signals to the input terminals. waveform. 2. Select the vertical coupling between AC (DC components are blocked) or DC (all signal components appear) for both channels. 3. Configure the trigger settings. For details, see page19. Make sure the trigger SOURCE switch is in either the CH1 or CH2 position. 4. Set the vertical MODE switch to the DUAL position. 5. Both the CH1 and CH2 signals appear on the display. ... -
Page 16: Waveform Addition/Subtraction
MEASUREMENT 72-6802 User Manual 6. Use the vertical ALT/CHOP Waveform Addition/Subtraction switch to select how the two waveform appear on the Steps display: alternately (ALT mode) 1. Make sure both CH1 and CH2 or simultanouesly (CHOP waveforms appear on the mode). See page17 for details. display. For details, see page30. 7. If necessary, use the 2. Set the vertical MODE switch to VOLTS/DIV knob and vertical the ADD position. The two POSITION knob to adjust the waveforms are added and vertical scale and position of appear on the display as a the waveform. single waveform. 8. If necessary, use the TIME/DIV 3. To subtract the CH2 signal from knob and horizontal POSITION the CH1 signal, invert the CH2 knob to adjust the horizontal signal by pressing the CH2 INV scale and position of the switch. ... -
Page 17: X-Y Mode
MEASUREMENT 72-6802 User Manual 5. To adjust the Y‐axis position and X-Y Mode deflection, use the CH2 vertical POSITION knob (position) and Background The X‐Y mode compares the amplitude of two CH2 VOLTS/DIV knob signals (CH1 and CH2), one as X‐axis (CH1) and (deflection). the other as Y‐axis (CH2). The X‐Y mode is useful Waveform Magnification for measuring the phase difference of two signals, video color patterns, and frequency response. Steps Background The oscilloscope can magnify the waveform by ten 1. Make sure both CH1 and CH2 times in the horizontal direction. The waveforms appear on the magnification is useful for observing complex display. For details, see page30. signals. 2. Move the TIME/DIV knob to the Steps 1. Make sure the waveform is shown on the X‐Y position. display. 2. Press the ×10 MAG switch. The waveform becomes magnified ... -
Page 18: Faq
72-6802 User Manual The input signal does not appear on the display. Check the following settings. • The coupling mode is not set at the GND mode, in which the waveform does not appear on the display. See page22 for details. • The appropriate trigger source is selected. See page19 for details. The oscilloscope accuracy does not match the specifications. The probe waveform is distorted. Make sure the oscilloscope is powered on for at least 30 minutes, You might need to compensate the probe. For details, see page26. within +20°C – +30°C. This is necessary to stabilize the oscilloscope. Note that frequency accuracy and duty factor are not specified for the probe compensation waveform and therefore it should not be For more information, contact your local dealer, Tenma website used for reference purpose. www.tenma.com., or MCM Electronics at www.mcmelectronics.com. The trace line does not appear on the display. -
Page 19: Appendix
APPENDIX 72-6802 User Manual 4. If necessary, replace the fuse that is attached to the fuse holder. 1 1 5 PPENDIX Line Voltage & Fuse Replacement 5. Push the fuse holder back into the socket. 1. Take off the power cord. 2 3 0 1 1 5 Fuse rating AC 115V: T0.63A/250V, AC 230V: T0.315A/250V 2. Use a small minus driver and pull out the fuse socket. 1 1 5 3. Rotate the holder so that the target voltage marking moves to the upper side. AC115V AC230V 1 1 5... -
Page 20: Specifications
APPENDIX 72-6802 User Manual Horizontal Axis Sweep time accuracy 0.2µS to 0.5S/DIV, ±3% ±5% (20/50nS uncalibrated) x10MAG accuracy Specifications Linearity ±3%, x10:±5% (20/50nS uncalibrated) X-Y Mode Sensitivity Same as vertical axis The specifications apply when the 72‐6802 is powered on for at least Bandwidth DC to at least 500kHz 30 minutes under +20°C – +30°C. Phase Difference ≤3 degrees at DC to 50kHz... -
Page 21: Declaration Of Conformity
APPENDIX Declaration of Conformity Tenma Test Equipment / MCM Electronics (1)650 Congress Park Drive, Centerville Ohio 45459, USA (2)405 S.Pioneer Blvd, Springboro Ohio 45066, USA declare, that the below mentioned product Type of Product: Oscilloscope Model Number: 72-6802 are herewith confirmed to comply with the requirements set out in the...