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Tektronix 2225 Manual

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Tektronix 2225 Oscilloscope
1. Summary of Controls, Connectors, and Indicators
No.
Title
1
INTENSITY
2
BEAM FIND
3
FOCUS
4
TRACE
ROTATION
5
POWER
6
Power Indicator
7,9
POSITION
8
TRACE SEP
10
CH 1-BOTH -
CH2
11
NORM- INVERT
Function
Adjusts trace brightness.
Compresses display to within CRT
limits.
Adjusts for finest trace thickness.
Adjusts trace parallel to centerline.
Turns power on and off.
Illuminates when power is turned on.
Moves trace up or down screen.
Moves the magnified trace vertically
with respect to the unmagnified trace
when HORIZONTAL MODE is set to
ALT.
Selects signal inputs for display.
Inverts the Channel 2 signal display.
Recommended Use
Compensate for ambient lighting,
trace speed, trigger frequency.
Locate off-screen phenomena.
Optimize display definition.
Compensate for earth's field.
Control power to the instrument.
Know power condition.
Position trace vertically and
compensate for dc component of
signal.
Position unmagnified and
horizontally magnified traces for
convenient viewing and
measurement.
View either channel independently
or both channels simultaneously
Provide for differential (CH 1 - CH 2)
or summed (CH 1 + CH 2) signals
when ADD is selected.

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Summary of Contents for Tektronix 2225

  • Page 1 Tektronix 2225 Oscilloscope 1. Summary of Controls, Connectors, and Indicators Title Function Recommended Use INTENSITY Adjusts trace brightness. Compensate for ambient lighting, trace speed, trigger frequency. BEAM FIND Compresses display to within CRT Locate off-screen phenomena. limits. FOCUS Adjusts for finest trace thickness.

  • Page 2: Probe Adjust

    Title Function Recommended Use ADD-ALT- CHOP ADD shows algebraic sum of CH 1 and Display summed or individual CH 2 signals. ALT displays each signals. channel alternately. CHOP switches between CH 1 and CH 2 signals during the sweep at 500 kHz rate. VOLTS/DIV Selects vertical sensitivity.
  • Page 3 Title Function Recommended Use SLOPE Selects the slope of the signal that Provide ability to trigger from triggers the sweep. positive-going or negative-going signals. LEVEL Selects trigger-signal amplitude point. Select actual point of trigger. TRIG'D Indicator lights when sweep is triggered Indicate trigger state.
  • Page 4 Vertical (both channels) POSITION Midrange MODE CH 1 VOLTS/DIV 0.5 V (1 OX PROBE) VOLTS/DIV Variable CAL detent (fully clockwise) Input Coupling Horizontal COARSE POSITION Midrange MODE SEC/DIV 0.2 ms SEC/DIV Variable CAL detent (fully clockwise) Trigger SLOPE LEVEL Midrange MODE P-PAUTO HOLDOFF...

  • Page 5: 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 6: Add And Invert

    C. ADD and INVERT Select ADD mode to display the algebraic sum of the CH 1 and CH 2 signals. When you use ADD, the CH 1 and CH 2 VOLTS/DIV settings should be equal. Selecting CH 2 INVERT changes the sense of the CH 2 waveform. This allows you to see the difference between the CH 1 and CH 2 signals on the ADD trace.

  • Page 7: Trigger Controls

    6. Trigger Controls For most signals, the trigger-control settings that will yield hands off triggering are: MODE P-P AUTO HOLDOFF SOURCE VERT MODE COUPLING A. Which Mode to Use P-P AUTO/TV LINE—With this mode set, the range of the LEVEL control is confined to the values between the triggering-signal peaks.

  • Page 8: Calibration Summary

    B. Source Choose a single trigger source to correctly display the timing relationships between two channels. Choose the channel with the lowest-frequency signal to avoid ambiguous displays. With VERT MODE TRIGGER SOURCE and either P-P AUTO TRIGGER MODE or CHOP VERTICAL MODE, the triggering signal is the algebraic sum of the Channel 1 and Channel 2 input signals.

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