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Summary of Contents for Tektronix 212
- Page 1 COMMITTED TO EXCELLENCE OSCILLOSCOPE OPERATORS MANUAL First Printing NOV 1972 Revised 1981 Re-Typeset NOV 2021...
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Page 2: Table Of Contents
Copyright © 1972 Tektronix, Inc. All rights reserved. Contents of this publication may not be reproduced in any form without the written permission of Tektronix. Inc. Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/or pending patents. TEKTRONIX, TEK, SCOPE-MOBILE, and are registered trademarks of Tektronix, lnc. -
Page 3: Introduction
The 212 Oscilloscope is a dual-channel portable oscilloscope using all solid state and integrated circuitry (except the CRT). The small size of the 212 makes it an extremely portable oscilloscope for on-location maintenance in many fields of application. SAFETY CONSIDERATIONS... - Page 4 INPUT COUPLING - selects the method used to couple the channel & input signal to the vertical amplifier system. AC - DC component of input signal is blocked. Low frequency limit (-3 dB point) is approximately 2 Hz. 212 Operators Handbook...
- Page 5 CH 2 - the sweep is triggered from an AC coupled sample of the vertical deflection signal before the vertical switching and only from Channel 2. EXT - the sweep is triggered from the DC coupled signal applied to the EXT TRIG banana jack. 212 Operators Handbook...
- Page 6 AUTO PRESET detent, the sweep is automatically triggered at a preset level on the positive-going slope. Stable triggering requires a minimum of 0.2 division internal signal or 1.0 volt external signal amplitude. INTENSITY - controls brightness of CRT display. 212 Operators Handbook...
- Page 7 CH1 the horizontal deflection. EXT TRIG - banana jack for input of an external trigger signal. COMMON - banana jack to establish common ground between the 212 and the external signal source or equipment under test. 212 Operators Handbook...
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Page 8: Operating Power Information
Battery Charging The charging characteristics of the nickel-cadmium (Ni-Cd) cells used in the 212 vary with the temperature at which they are charged. Batteries charged at about +20°C to +30°C (+68°F to +86°F) will deliver more energy than when the same batteries are charged at a higher or lower temperature. - Page 9 The rate at which this self-discharge occurs is dependent upon the storage temperature and humidity. If the 212 is to be stored for extended periods, particularly at either high ambient temperature or...
- Page 10 If the internal batteries of the 212 become discharged to the minimum operating level, continued operation can be obtained by connecting the instrument to an AC power source.
- Page 11 90 to 110 VAC 48 to 52 Hz Operating Temperature The 212 can be operated from the batteries in ambient air temperatures between -15°C and +55°C (+5°F and +131°F). The instrument should only be connected to an AC line source in ambient temperatures between 0°C and +40°C (+32°F and +104°F).
- Page 12 Refer to the 212 Service manual for additional information concerning Option 1. Option 2 Option 2 equips the 212 for operation from a 90 to 110 VAC, 48 to 52 Hz power line source. Refer to the 212 Service manual for additional information concerning Option 2.
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Page 13: General Operating Information
INTENSITY control higher than is necessary to provide a satisfactory display. Be careful that the INTENSITY control is not set too high when changing the SEC/DIV switch from a fast to a slow sweep rate. 212 Operators Handbook... - Page 14 Graticule The graticule of the 212 is internally marked on the faceplate of the CRT to provide accurate, no-parallax measurements. graticule is marked with six vertical and 10 horizontal divisions. Each major division is segmented into five minor divisions at the center vertical and horizontal lines.
- Page 15 Signals can be connected to the EXT TRIG banana jack with short unshielded leads under most conditions. Be sure to establish a common ground between the 212 and the equipment under test. Attempt to position the unshielded leads away from any source of interference to avoid errors in triggering.
- Page 16 (ground) lead in addition to the signal lead or probes. The ground straps on the attached probes provide the best ground. Also, a ground lead can be connected to the-212 chassis COMMON banana jack to establish a common ground with the signal source.
- Page 17 The DC coupling position can be used for most applications. This position allows measurements of the DC component of a signal, and must be used to display signals below about 10 hertz as they will be attenuated in the AC position. 212 Operators Handbook...
- Page 18 3. Wait several seconds for the input coupling capacitor to charge. 4. Set the INPUT COUPLING switch to AC. The display will remain on the screen so the AC component of the signal can be measured in the normal manner. 212 Operators Handbook...
- Page 19 LEVEL/SLOPE control. In this position the 212 will trigger on at least 0.2 division of the applied signal within the bandwidth limits of the instrument.
- Page 20 Since this instrument does not have an internal delay line, the display might not start on the selected slope, particularly when the displayed waveforms have a high repetition rate. 212 Operators Handbook...
- Page 21 When the LEVEL/SLOPE control is set to this position, the sweep is automatically triggered at the preset level; when out of this position the effect is that of a normal triggering mode. 212 Operators Handbook...
- Page 22 50 kilohertz. Since the X and Y channels of this instrument are not time matched, some inherent phase shift can be expected in the display. Take this phase shift into consideration when making measurements in the X-Y mode. 212 Operators Handbook...
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Page 23: Operators Adjustments
Vertical Gain Connect the CH 1 probe tip to an accurate 0.2 volt source (such as a TEKTRONIX 067-0502-01 Standard Amplitude Calibrator). Set the VOLTS/DIV switch to 50 m and set the VERT GAIN adjustment for exactly four divisions of deflection. - Page 24 Horizontal Gain Set the SEC/DIV switch to X-Y. Connect the CH 1 probe tip to an accurate 0.2 volt source (such as a TEKTRONIX 067-0502-01 Standard Amplitude Calibrator). Set the CH 1 VOL TS/DIV switch to 50 m and the CH 2 POSition control to midrange. Adjust the HORIZ GAIN adjustment for exactly four horizontal divisions of deflection between dots.
- Page 25 Auto Preset Connect the CH 1 probe tip to a sine-wave signal source within the bandwidth limits of the 212. Set the LEVEL/SLOPE control to the AUTO PRESET detent and adjust the VOLTS/DIV and SEC/DIV switches for a display approximately four divisions in amplitude with one cycle of signal displayed every two or three divisions.
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Page 26: Applications
This instrument can also be used for many applications which are not described in this handbook. Contact your local TEKTRONIX Field Office or representative for assistance in making specific measurements with this instrument. Voltage Measurements 1. - Page 27 (VOLTS/DIV X Probe attenuation factor). Position to center vertical line Vertical deflection Fig. 3. Measuring peak-to-peak voltage. NOTE This technique also used make measurements between two points on the waveform other than peak-to-peak. 212 Operators Handbook...
- Page 28 Adjust the SEC/DIV switch for the desired display. d. Measure the vertical amplitude in divisions from the point to be measured to the reference line. e. Voltage = measured amplitude (in divisions), multiplied by the deflection factor. 212 Operators Handbook...
- Page 29 Deflection factor conversion constant equals: Reference Signal Voltage VOLTS/DIV Display Amplitude Setting in divisions d. Adjusted deflection factor tor any setting of the VOLTS/DIV switch equals VOLTS/DIV setting multiplied by the conversion factor. 212 Operators Handbook...
- Page 30 4. Elevated Reference Another method of making a voltage measurement with respect to a voltage level rather than ground, is to connect the 212 probe ground clip directly to the desired reference voltage. CAUTION The 212 probe ground clips and the instrument COMMON input jack are electrically connected.
- Page 31 Using the graticule, measure the horizontal distance between the two events. b. Multiply the distance measured by the SEC/DIV control setting to obtain the time interval. The HORIZ MAG must be in the CAL position. 212 Operators Handbook...
- Page 32 Adjust the span of a reference waveform so that one cycle covers a given number of divisions. (Figure 4 illustrates how the graticule can be calibrated for 45° per division). The phase difference of a signal from the reference equals the displacement from the calibrated points on the graticule. 212 Operators Handbook...
- Page 33 Channel 2 Channel 1 (reference) (lagging) Horizontal Difference 8 Divisions (360°) per division 8 div Fig. 4. Measuring phase difference. 212 Operators Handbook...
- Page 34 Phase comparison between two signals of the same frequency can be made (up to the frequency limit of the vertical system) using the dual-trace feature of the 212. a. Set the VOLTS/DIV and VAR of both channels to display 4 or 5 divisions of vertical deflection.
- Page 35 Measure the horizontal difference between corresponding points on the display. f. Multiply the measured distance in divisions by 45° I divisions to obtain the phase difference. Distance Phase Difference = division divisions 212 Operators Handbook...