Tektronix 2225 Operator's Manual
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Tektronix 2225 Operator's Manual

Tektronix 2225 Operator's Manual

Oscilloscope and options
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TEK
070-6298-01
PRODUCT GROUP 46
2225 OSCILLOSCOPE
AND OPTIONS
OPERATOR'S MANUAL
Ttektronix
First Printed October 1986
UK Revised O ctober 1987
C O M M ITT E D TO EXCELLENCE

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Summary of Contents for Tektronix 2225

  • Page 1 070-6298-01 PRODUCT GROUP 46 2225 OSCILLOSCOPE AND OPTIONS OPERATOR’S MANUAL Ttektronix First Printed October 1986 UK Revised O ctober 1987 C O M M ITT E D TO EXCELLENCE...
  • Page 2 Tektronix, Inc. Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents issued and pending. Information in this publication supersedes that in all previously published material.
  • Page 3 NOTICE to the user/operator: The German Postal Service requires that Systems assembled by the operator/user of this instrument must also comply with Postal Regulation, Vfg. 1046/1984, Par. 2, Sect. 1. HINWEIS fur den Benutzer/Betreiber: Die vom Betreiber zusammengestellte Anlage, innerhalb derer dies Gerat eingesetzt wird, mu/3 ebenfalls den Voraussetzungen nach Par.
  • Page 4 The German Postal Service has the right to re-test the series and to verify that it complies. TEKTRONIX Bescheinigung des Herstellers/lmporteurs Hiermit wird bescheinigt, da/3 der/die/das 2225 OSCILLOSCOPE_______ ___________________AND ALL INSTALLED OPTIONS__________________ in Ubereinstimmung mit den Bestimmungen der Amtsblatt-Verfugung 1046/1984 funkentstort ist.

  • Page 5: Table Of Contents

    CONTENTS Page List of Illustrations..............List of T ables................Operator’ s Safety S u m m a ry........... The 2225 O scilloscope............SECTION 1— Preparation for Use Safety..................Line Voltage Selection............. Line F use.................. Power C o r d ................
  • Page 6 SECTION 4 — Checks and Adjustments Trace Rotation................Probe Compensation ............. SECTION 5— Performance Characteristics SECTION 6 — Options and Accessories Standard Accessories ............Options ............Optional Accessories ............. APPENDIX A — Magnified Sweep Speeds APPENDIX B— Repackaging for Shipment 2225 Operators...
  • Page 7 EXT INPUT co n n e cto rs..........5-7 TABLES Table Page 1 -1 Power Plugs and Line Voltage Selection....Summary of Controls, Connectors, and Indicators . . . Electrical Characteristics..........Environmental C haracteristics........3 Mechanical C haracteristics........6- 1 Power Cords and Fuses..........Optional Accessories..........2225 Operators...

  • Page 8: Operator's Safety Summary

    Symbols In This Manual This symbol indicates applicable cautionary or other information. For maximum input voltage see Table 5-1. As Marked on Equipment DANGER— High voltage. Protective ground (earth) terminal. © ATTENTION— Refer to manual. 2225 Operators...
  • Page 9 Do Not Remove Covers or Panels To avoid personal injury, do not remove the product covers or panels. Do not operate the product without the covers and panels properly installed. 2225 Operators...

  • Page 10: The 2225 Oscilloscope

    Besides having standard AC and DC signal coupling methods, the 2225 also gives the user the ability to filter out high-frequency and low-frequency components of the trigger­ ing signal. An external triggering signal or an external Z-axis modulation signal can be applied via a front-panel connector and the source-selector switches.
  • Page 11 Accessories. The voltage-sensing, 10X attenuator probes were designed specifically to complement the performance of your 2225. These new probes are built with a sturdy tip that is also replaceable. Compensation is accomplished through a closable window on the probe body itself— thus eliminating the bulky compensation box from the front of the oscilloscope.

  • Page 13: Section 1- Preparation For Use

    SECTION 1 PREPARATION FOR USE 2225 Operators...

  • Page 15: Safety

    Refer to Table 1-1, Figure 1-1, and the instrument rear panel. To convert the 2225 for operation on the other line-voltage range, use a flat-head screwdriver to move the LINE VOLTAGE SELEC­...

  • Page 16: Line Fuse

    4. Verify that the fuse is the same type listed on the back of the instrument. The two types of fuses listed are not directly inter­ changeable; they require different types of fuse caps. 5. Reinstall the fuse (or replacement fuse) in the fuse-holder cap. 6. Replace the fuse holder and cap. 2225 Operators...
  • Page 17 — Standards Association of Australia — British Standards Institution CEE — International Commission on Rules for the Approval of Electric — Equipment — International Electrotechnical Commission NEMA— National Electrical Manufacturer’ s Association SEV — Schweizerischer Elektrotechnischer Verein — Underwriters Laboratories Inc. 2225 Operators...

  • Page 18: Receptacle

    POWER BEFORE REPLACING FUSE, FOR CONTINUED FIRE PROTECTION REPLACE 230V ONLY WITH SPECIFIED TYPE AND RATED FUSE. TEKTRONIX. U.K. LTD . MARLOW. ENGLAND. LINE VOLTAGE SELECTOR (MAINS) ATTACH POWER- SWITCH CORD CLAMP Figure 1-1. Voltage selector switch, fuse, and power-cord receptacle.

  • Page 19: Power Cord

    5. Ensured adequate ventilation around the instrument. 6. Plugged the power cord into the appropriate power-source outlet. Now turn on your oscilloscope by pressing in the POWER button. Observe that the POWER-ON indicator, located below the button, illuminates. 2225 Operators...

  • Page 21: Section 2- Operation

    SECTION 2 OPERATION 2225 Operators...
  • Page 22 Tektronix 2225 SO M H / 0 9 0 1 LOSCOPE VERTICAL HORIZONTAL r s r s n O PosiTioN tO H i J INTENSITY P O SITIO N TRACE SEP . .P O S IT IO N COARSE HN E | I J...
  • Page 23 NOTE: Numbers on the instrument are keyed to Table 2-1.

  • Page 24: Front Panel Organization

    Operation FRONT PANEL ORGANIZATION The front panel on the 2225 is organized to make it easy for you to set up displays and make measurements. Referring to the foldout illustration at the front of this manual, or to the oscilloscope itself, notice that the front panel is partitioned into four major control sections—...
  • Page 25 In DC, couples all components of signal. CH 1 OR X Provides for input signal Apply signals to the vertical connections. CH 1 gives deflection system. CH 2 OR Y horizontal deflection when SEC/DIV is in X-Y. 2225 Operators...
  • Page 26 SWP triggers sweep only once when armed by RESET button; used for dis­ playing or photographing nonrepetitive or unstable signals. RESET Arms trigger circuit for SGL SW P. HOLDOFF Varies sweep holdoff time Improve ability to trigger 10:1. from aperiodic signals. 2225 Operators...
  • Page 27 Also used for single-shot used as a trigger. application. Connection for applying Provide reference blips by intensity modulation from external signal that can be used for intensity independent source. modulation. 2225 Operators...

  • Page 28: Learning The Controls

    4. Switch input coupling back to AC. Notice that the square wave is centered vertically on the screen. Now switch input coupling to DC and observe what happens to the waveform. The zero reference is maintained at the center horizontal graticule line. 2225 Operators...

  • Page 29: Display Controls

    Finally, return the middle MODE switch to NORM. What waveform is displayed now? Congratulations! You now know how to use the 2225 front-panel controls to display signals and move them about on the screen. The remainder of this section gives you more information about the controls and offers suggestions for their use.

  • Page 30: Vertical Controls

    "(up to 2 pus/division). The ALT mode displays each channel for the duration of a com­ plete sweep. It gives a cleaner display of multiple channels than CHOP does and is usually preferred at moderate to high sweep speeds. 2225 Operators...

  • Page 31: Increasing The Sensitivity

    With the center vertical graticule as the reference line, the investi­ gation of waveform details around any point on the unmagnified trace as well as the measurement of time with greater accuracy then become easy tasks. 2225 Operators...

  • Page 32: Trigger Controls

    TV FIELD— This mode triggers the sweep at the beginning of a television field. To change the TV field being displayed, you must interrupt the trigger signal by setting the input coupling switch momentarily to GND then back to either DC or AC until the desired field is displayed. 2225 Operators...

  • Page 33: Source

    Changing the HOLDOFF setting can force the instrument to display all the modes of the signal. Nor­ mally, the HOLDOFF control should be set at MIN. 2225 Operators 2-10...

  • Page 34: Connecting Signals

    Fast signal transitions will be highly distorted, and extraneous noise will be induced without the probe ground connection. 2-11 2225 Operators...

  • Page 35: Probe Compensation

    Coaxial Cables To maintain good waveform fidelity and accuracy, use only high-quality, low-loss coaxial cables. When you use 5011 or 7511 coaxial cable, attach a matching external terminator. Some high frequency response will be lost with external termination. 2225 Operators 2-12...

  • Page 36: Section 3- Applications

    SECTION 3 APPLICATIONS 2225 Operators...

  • Page 38: Amplitude Measurements

    Applications This section describes how to make specific types of measure­ ments with your 2225 Oscilloscope. Before performing any pro­ cedure, be sure you are familiar with the information contained in and in Section 1. Preset the instru­ O p e ra to r’ s S afety S u m m a ry ment front-panel controls, using the setup on page 2-5 as a guideline, and then turn on the power.

  • Page 39: Instantaneous Voltage

    VERTICAL MODE switch to display the channel used. 2. Verify that the VOLTS/DIV variable control is in the CAL detent and set input coupling to GND. 3. Vertically position the trace to the center horizontal graticule line. This establishes the ground reference location. 2225 Operators...

  • Page 40: Instantaneous Voltage Measurement

    (see Figure 3-2). & LINE VERTICAL DEFLECTION MEASURE POSITIVE AMPLITUDE POSITIVE ® TO ® REFERENCE LINE NEGATIVE AMPLITUDE © TO ® 4 1 1 5 - 0 7 Figure 3-2. Instantaneous voltage measurement. 2225 Operators...

  • Page 41: Algebraic Addition

    This ensures the greatest dynamic range for ADD mode operation. 4. To attain similar responses from both channels, set the Chan­ nel 1 and Channel 2 input coupling switches to the same position. 2225 Operators...

  • Page 42: Common-Mode Rejection

    § § ' FROM LINE ’5 FREQUENCY SOURCE INVERTED C H I AND CH 2 SIGNALS SIGNAL WITH I .1 LINE FREQUENCY ' l l COMPONENT CANCELED OUT RESULTANTSIGNAL 4 2 0 7 - 1 5 Figure 3-3.Common-mode rejection. 2225 Operators...

  • Page 43: Amplitude Comparison (Ratio)

    VOLTS/DIV switch and variable (CAL) control. Unknown signals can then be quickly and accurately compared to the reference signal without disturbing the setting of the VOLTS/DIV variable control. READ PERCENT RATIO (30%) 4732-10 Figure 3-4. Determining voltage ratio. 2225 Operators...

  • Page 44: Time Measurements

    Ensure that the SEC/DIV vari­ able control is in the CAL detent. 4. Position the display to place the time-measurement points on the center horizontal graticule line (see Figure 3-5). 5. Measure the horizontal distance between the time-measure­ ment points. 2225 Operators...

  • Page 45: Period And Frequency

    (T). The frequency (f) of a recurrent signal can be determined from its period as follows: 1. Measure the time duration of one waveform cycle (period) using the preceding time-duration measurement procedure. . Calculate the reciprocal of the period to determine the wave­ form frequency. 2225 Operators...

  • Page 46: Rise Time

    % graticule line and the top of the waveform touches the % graticule line. 4. Horizontally position the display so the 10% point on the wave­ form intersects the second vertical graticule line (Figure 3-6, Fbint A). Measuring rise time. Figure 3-6. 2225 Operators...

  • Page 47: Time Difference Between Pulses On Time-Related

    = 5 d iv x 1 p-s/div = Time Difference Between Pulses On Time-Related Signals The calibrated sweep speed and dual-trace features of the 2225 allow measurement of the time difference between two separate events. To measure time difference, use the following procedure: 1.
  • Page 48 X I0. The horizontal difference between waveform mea­ surement points is 4.5 divisions. Substituting the given values in the formula: Time = 50 H-s/div x 4.5 div _ 22.5 Difference Figure 3-7. Time difference between pulses on time-related signals. 3-11 2225 Operators...

  • Page 49: Phase Difference

    In a similar manner to the preceding measurement, you can make a phase comparison between two signals of the same frequency using the dual-trace feature of the 2225. This method of phase- difference measurement can be used for signals with frequencies up to the limit of the vertical deflection system.
  • Page 50 45° per division. Substituting the given values into the phase-difference formula: Phase Difference = 0.6 div x 45°/div = 27°. MEASURE TIME FROM A TO B HORIZONTAL DIFFERENCE 4 2 0 7 - 1 9 Figure 3-8. Phase difference. 2225 Operators 3-13...
  • Page 51 EXAMPLE. In Figure 3-9 the 10X magnified display results in a horizontal difference of six divisions between the two signals. Substituting the given values into the phase difference formula: Phase Difference = div x 4.5°/div = 27°. 3-14 2225 Operators...

  • Page 52: Signals

    Applications TELEVISION DISPLAYS TV Field Signals The television feature of the 2225 can be used to display TV Field signals. 1. Set the TRIGGER MODE switch to TV FIELD and set the SEC/ DIV switch to 2 ms. 2. Apply the television signal to either the CH 1 or the CH 2 input connector and set the VERTICAL MODE switch to display the channel used.
  • Page 53 Z-modulation is seen as gaps in the trace at the modulation frequency. The size of the gap depends upon the mark-to-space ratio of the Z-modulation signal. The positive­ going portion of the Z-modulation signal decreases brightness. 3-16 2225 Operators...
  • Page 54 SECTION 4 CHECKS AND ADJUSTMENTS 2225 Operators...

  • Page 56: Probe Compensation

    CH 1 and CH 2 input connectors. 3. Set both VOLTS/DIV switches to 10 mV, set both input cou­ pling switches to DC, and select CH 1 VERTICAL MODE. 4. Place the tip of the Channel 1 probe onto the PROBE ADJUST output terminal. 2225 Operators...
  • Page 57 9. Select CH 2 VERTICAL MODE. Disconnect the Channel 1 probe tip and attach the Channel 2 probe tip to the PROBE ADJUST output terminal. 10. Obtain a 5-division signal display and vertically center the trace. 11. Repeat step 7 for the Channel probe. 2225 Operators...

  • Page 58: Locating The Low-Frequency Compensation Adjustment

    Checks and Adjustments Figure 4-2. Locating the low-frequency compensation adjustment. 2225 Operators...
  • Page 60 SECTION 5 PERFORMANCE CHARACTERISTICS 2225 Operators...

  • Page 62: Electrical Characteristics

    Performance Characteristics The electrical characteristics listed in Table 5-1 are valid for the 2225 when it has been adjusted at an ambient temperature between + 20°C and + 30°C, has had a warm-up period of at least minutes, and is operating at an ambient temperature between °C and +40°C (unless otherwise noted).

  • Page 63: Common-Mode Rejection

    Control Rotation With Channel 2 1.5 divisions or less. Inverted With X I0 Vertical divisions or less. 2 .0 Magnification Channel Isolation Greater than 100 to 1 at 10 MHz. Trace Separation Range At least ± 3 divisions. 2225 Operators...
  • Page 64 Can increase sweep holdoff time by at least a factor of 8, with SEC/DIV set to 1ms. LF Reject Lower 30 kHz ±25% . 3 dB Point HF Reject 3 dB Point 30 kHz ±25% . 2225 Operators REV MAY 1987...
  • Page 65 5 V causes noticeable modulation. Positive-going input decreases intensity. Usable Frequency Range Dc to 5 MHz. 400 V (dc + peak ac) or 800 V ac Maximum Safe Input Voltage p-p to 10 kHz or less. REV OCT 1987 2225 Operators...
  • Page 66 {Va x 115 V Setting 1.0 A, Slow 0.5 A, Slow 230 V Setting CATHODE-RAY TUBE 80 by 100 mm. Display Area Standard Phosphor GH (P31). 12,600 V ± 6 0 V Nominal Accelerating Voltage 2225 Operators REV OCT 1987...

  • Page 67: Environmental Characteristics

    All major resonances must be above 55 Hz. Shock (Operating and 30 g, half-sine, ll-ms duration, three Nonoperating) shocks per axis each direction, for a total of 18 shocks. Radiated and Conducted Meets VDE 0871 Class B and FCC Emission Reguirements Regulations. 2225 Operators...

  • Page 68: Mechanical Characteristics

    438 mm (17.2 in). With Optional Front 445 mm (17.5 in). Cover With Handle 511 mm (20.1 in). Extended Figure 5-1. Derating curve for CH 1 OR X, CH 2 OR Y, and EXT INPUT OR Z connectors. 2225 Operators REV OCT 1987...
  • Page 70 SECTION 6 OPTIONS AND ACCESSORIES 2225 Operators...
  • Page 72 Option 1C An oscilloscope camera is useful for capturing single events and documenting measurement results. And it helps communicate results with clarity and credibility. Option 1C provides the Tektronix C-5C Option 04 Low-cost Camera for use with your oscilloscope. Option IK When this option is specified, a K212 Portable Instrument Cart is included in the shipment.

  • Page 73: Power Cords And Fuses

    Power Cords Instruments are shipped with the detachable power cord and fuse configuration ordered by the customer. Table 6-1 identifies the Tektronix part numbers for international power cords and associated fuses. Additional information about power-cord options is contained in Section 1, P re p a ra tio n fo r U se.

  • Page 74: Optional Accessories

    Part Number Front-panel Protective Cover 200-3397-00 Accessory Pouch 016-0677-02 Front-panel Protective Cover 020-1514-00 and Accessory Pouch Flard Carrying Case 016-0792-01 CRT Light Filter, Clear 337-2775-01 Rack Mount Conversion Kit 016-0819-00 Viewing Hoods Collapsible 016-0592-00 Polarised 016-0180-00 Binocular 016-0566-00 2225 Operators...
  • Page 75 DC Inverter 1107 DC Inverter Mounting Kit 016-0785-00 Portable Power Supply 1105 Battery Pack 1106 Oscilloscope Cameras Low-cost C-5C Option 04 Motorized C-7 Option 03 and Option 30 K212 Portable Instrument Cart 2225 Service Manual 070-6299-00 2225 Operators...
  • Page 76 2 0 ns .2 |xs 10 ns .5 |xs 5 0 ns N /A 4 0 ns 2 0 ns . 2 | N /A 10 ns 2 0 n s ' N /A 10 ns 5 ns 2225 Operators...
  • Page 78 275 pounds. 2. If it is to be shipped to a Tektronix Service Center for service or repair, attach a tag to the instrument showing the following: owner (with address), name of the person at your firm who can be contacted, complete instrument type and serial number, and a description of the service required.
  • Page 79 NOTES...

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