Tektronix 2213 schematic

COMMITTED TO EXCELLENCE

PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL.

2213

OSCILLOSCOPE

OPERATORS

INSTRUCTION MANUAL

Tektronix, Inc. P.O. Box Beaverton, Oregon

500

97077

Serial Number __________

070-3397-00 Product Group 46

First Printing JUN 1981 Revised AUG 1982

2213 Operators

CONTROLS, CONNECTORS, AND INDICATORS

The following descriptions are intended to familiarize the operator with the location, operation, and function of the instrument’s controls, connectors, and indicators.

POWER, DISPLAY, AND

PROBE ADJUST

Refer to Figure 3 for location of items 1 through 7.

Internal Graticule-Eliminates parallax viewing error

between the trace and graticule lines. Rise-time amplitude and measurement points are indicated at the left edge of the graticule.

POWER Switch-Turns instrument power on and off.

Press in for ON; press again for OFF.

AUTO FOCUS Control-Adjusts display for optimum

definition. Once set, the focus of the crt display will

be maintained as changes occur in the intensity level of the trace.

PROBE ADJ

0.5

negative going, square-wave voltage (at approximately 1 pensate voltage probes and to check operation of the oscilloscope vertical system. It is not intended to verify the accuracy of the vertical gain or time-base calibration.

BEAM FIND Switch-When held in, compresses the

display to within the graticule area and provides a visible viewing intensity to aid in locating off-screen displays.

TRACE ROTATION Control-Screwdriver control

used to align the crt trace with the horizontal graticule lines.

AUTO INTENSITY Control-Adjusts brightness of

the crt display. This control has no effect when the

BEAM FIND switch is pressed in. Once the control

is set, intensity is automatically maintained at approximately the same level between SEC/DIV switch settings from 0.5 ms per division to 0.05 per division.

Connector-Provides an approximately

kHz)

that permits the operator to com-

pus

Figure 3. Power, display, and probe adjust controls, connector, and

indicator.

VERTICAL

Refer to Figure 4 for location of items 8 through 16.

SERIAL and Mod Slots-The SERIAL slot is im-

printed with the instrument’s serial number. The Mod slot contains the option number that has been installed in the instrument.

CH 1 OR X and CH 2 OR Y Connectors-Provide

for application of external signals to the inputs of the vertical deflection system or for an X-Y display.

In the X-Y mode, the signal connected to the CH 1 OR X connector provides horizontal deflection, and the signal connected to the CH 2 OR Y connector provides vertical deflection.

GND Connector-Provides direct connection to

instrument chassis ground.

REV NOV 1981

MHz OSCILLOSCOPE

Figure 4. Vertical controls and connectors.

3397-05

2213 Operators

10X

PROBE-Indicates the deflection factor

selected when using a 10X probe.

VOLTS/DIV

ter clockwise out of their detent positions, these

controls provide continuously variable, uncalibrated deflection factors between the calibrated settings of the

VOLTS/DIV brated deflection factor to 25 volts per division with IX probe (a range of at least 2.51).

INVERT Switch-Inverts the Channel 2 display when

button is pressed in. Push button must be pressed in a second time to release it and regain a noninverted display.

VERTICAL MODE Switches-Two three-position

switches are used to select the

the vertical amplifier system.

CH I-Selects only the Channel 1 input signal for

display.

BOTH-Selects both Channel 1 and Channel 2 input signals be selected for either ADD, ALT, or CHOP

operation.

Variable Controls-When

switches.Extends maximum uncali-

for display.

The BOTH position must

rotated

mode of operation

coun-

for

Input Coupling (AC-GND-DC) Switches-Used to

select the method of coupling input signals to the vertical deflection system.

AC-Input signal is capacitively coupled to the vertical amplifier. The dc component of the input signal is blocked. Low-frequency limit (-3 point) is approximately 10 Hz.

GND-The input of the vertical amplifier is grounded to provide a zero (ground) voltage display (does not ground the input signal). This switch position allows coupling capacitor.

DC-All frequency components of the input

signal are coupled to the vertical deflection system.

CH 1

VOLTS/DlV Used to select the vertical deflection factor in a l-2-5 sequence. To obtain a calibrated deflection factor, the

VOLTS/DIV

PROBE-Indicates the deflection factor

selected when using either a 1X probe or a coaxial

cable.

and CH 2

variable control must be in detent.

precharging

VOLTS/DIV Switches-

reference-

the input

2-Selects

display.

ADD-Displays the algebraic sum of the Channel 1 and Channel 2 input signals.

ALT-Alternately displays Channel 1 and Channel 2 input signals. The alternation occurs during

retrace at the end of each sweep.

is useful for viewing both input signals at sweep speeds from 0.05 ps per division to 0.2 ms per division.

CHOP-The display switches between the Chan-

nel 1 and Channel 2 input signals during the sweep. The switching rate is approximately 250

kHz.

This mode is useful for viewing both Channel

1 and Channel 2 input signals at sweep speeds from 0.5 ms per division to 0.5 s per division.

POSITION Controls-Used to vertically position the

display on the crt. When the SEC/DIV switch is set to X-Y, the Channel 2 POSITION control moves the display vertically (Y-axis), and the Horizontal POSITION control moves the display horizontally (X-axis).

only the Channel 2 input signal for

This

mode

REV OCT 1981

2213 Operators

HORIZONTAL

Refer to Figure 5 for location of items 17 through 22.

DELAY

with select the amount of delay time between the start of the sweep and the beginning of the intensified zone.

SEC/DIV

for the sweep generator in a l-2-5 sequence.

calibrated sweep speeds, the control must

wise).

TIME-Two controls are used in conjunction

INTENS

Range Selector

selects 0.5 increase the sweep delay from the calibrated setting of the Range Selector switch, rotate the MULTIPLIER control clockwise.

MULTIPLIER Control-Provides variable sweep delay from less than 1 to greater than 20 times the setting of the Range Selector switch.

and DLY’D HORIZONTAL MODE to

Switch-This three-position switch

rc(s,

,us,

and 0.2 ms of delay time. To

Switch-Used to select the sweep speed

SEC/DIV

be in the calibrated detent (fully clock-

For

Variable

SEC/DIV

variable, uncalibrated sweep speeds to at least 2.5 times the calibrated setting. It extends the slowest sweep speed to at least 1.25 s per division.

X10

speed by a factor of 10, pull out the Variable knob. The fastest sweep speed can be extended to 5 ns per division. Push in the Variable control knob to regain the Xl sweep speed.

HORIZONTAL MODE Switch-This three-position

switch determines

horizontal deflection system.

Variable

Magnifier Switch-To

NO DLY-Horizontal deflection is provided by the sweep generator, sweep speed determined by the

INTENS-Horizontal deflection is provided by the sweep generator at a sweep speed determined by the

SEC/DIV provides an intensified zone on the display. The start of the intensified zone represents the sweep-

start point when DLY’D HORIZONTAL MODE

is selected.

Control-Provides continuously

increase displayed sweep

the mode of operation for the

without a delayed start, at a

SEC/DIV

switch. The sweep generator also

SEC/DIV

switch.

SEC/W

Figure 5. Horizontal controls.

3397-06

DLY’D-Horizontal deflection is provided by the

sweep generator at a sweep speed determined by the

SEC/DIV sweep is delayed from the initial sweep-trigger point by a time determined by the setting of the

DELAY TIME Range Selector switch and MULTI-

PLIER control.

POSITION Control-Positions the display hori-

zontally

in all modes.

switch setting. The start of the

TRIGGER

Refer to Figure 6 for locations of items 23 through 30.

EXT INPUT

ducing external signals into the trigger generator.

EXT COUPLING

used

AC-Signals above 60 Hz are capacitively coupled

to the input of the Trigger circuit.

ponents are blocked, and signals below 60 Hz are

attenuated.

Connector-Provides a means of intro-

Switch-Determines the method

couple external signals to the Trigger circuit.

Any dc com-

2213 Operators

DC-All

components of the signal are coupled to

the trigger circuitry. This position

displaying low-frequency or low-repetition-rate signals.

DC+lO-External

a factor of 10.

SOURCE Switch-Determines the source of the

trigger signal that is coupled to the input of the trigger circuit.

INT-Permits triggering on signals that are applied to the CH 1 OR X and CH 2 OR Y input connectors. selected by the INT switch.

LINE-Provides a triggering signal from a sample of the ac-power-source waveform. This trigger source is useful when channel-input signals are time related (multiple or submultiple) to the frequency on the power-source-input voltage.

EXT-Permits triggering on signals applied to the EXT INPUT connector.

trigger signals are attenuated by

The source of the internal signal is

useful

for

INT Switch-Selects the source of the triggering

signal when the

CH I-The signal applied to the CH 1 OR X input connector is the

VERT MODE-The internal trigger source is determined by the signals selected for display by the VERTICAL MODE switches.

connector is the source of the trigger signal.

LEVEL Control-Selects the amplitude point on the

trigger signal at

TRIG’D Indicator-The light-emitting diode (LED)

illuminates to indicate that the sweep is triggered.

SLOPE Switch-Selects the slope of the signal that

triggers the sweep (also refer to TV Signal Displays at

the end of “Instrument Familiarization”).

I-Sweep is

portion of the trigger signal.

SOURCE switch is set to INT.

source of the trigger signal.

2-The signal applied to the CH 2 OR Y input

which

the sweep is triggered.

triggered on the positive-going

Figure 6. Trigger controls, connector, and indicator.

3397-07

I-Sweep

portion of the trigger signal.

MODE Switch-Determines the trigger mode for the

sweep.

AUTO-Permits triggering on waveforms having repetition rates of at least 20 Hz. Sweep free-runs

in the absence of an adquate trigger signal or when the repetition rate is below 20 Hz. The range of the TRIGGER LEVEL control will compensate for the amplitude variations of the trigger signals.

NORM-Sweep is initiated when an adequate trigger signal is applied.

signal, no baseline trace will be present. Triggering on television lines is accomplished in this mode.

TV FIELD-Permits triggering on television fieldrate signals (refer to of “Instrument Familiarization”.

VAR HOLDOFF

trol of the

holdoff control improves the ability to trigger on aperiodic signals (such as complex digital waveforms).

is triggered on the negative-going

In the absence of a trigger

Signal Displays at the end

Control-Provides continuous con-

holdoff

time between sweeps. Increases

time by at least a factor of four. This

REV NOV 1981

2213 Operators

REAR PANEL

Refer to Figure 7 for location of item 32.

EXT

necting

AXIS Connector-Provides a means of

external signals to the Z-axis amplifier to

con-

REPLACE ONLY WITH SPECIFIED

TYPE

AND RATED FUSE DISCONNECT

POWER INPUT BEFORE REPLACING FUSE

intensity modulate the crt display. Applied signals do not affect display waveshape. Signals with fast rise times and fall times provide the most abrupt intensity change, and a 5-V p-p signal will produce noticeable modulation. The Z-axis signals must be time-related to the display to obtain a stable ation

on the crt.

GROUNDING CONDUCTOR

lOK0

POSITIVE GOING

present-

Figure 7. Rear-panel connector.

3397-08

OPERATING CONSIDERATIONS

2213 Operators

This section contains basic operating information and

techniques that should be considered before attempting

any measurements.

GRATICULE

The graticule is internally marked on the faceplate of the crt to enable accurate measurements without parallax error (see Figure 8). It is marked with eight vertical and ten horizontal major divisions. Each major division is divided

into five subdivisions. The vertical deflection factors and

horizontal timing are calibrated to the graticule so that accurate measurements can be made directly from the crt. Also, percentage markers for the measurement of rise and fall times are located on the left side of the graticule.

1ST OR LEFT

VERTICAL

GRATICULE

LINE

CENTER

VERTICAL

GRATICULE

LINE

11TH

OR RIGHT

VERTICAL

GRATICULE

LINE

SIGNAL CONNECTIONS

Generally, probes offer the most convenient means of connecting an input signal to the instrument. They are shielded to prevent pickup of electromagnetic interference, and the supplied 10X probe offers a high input impedance that minimizes circuit loading. This allows the circuit under test to operate with a minimum of change from its normal condition as measurements are being made.

Coaxial cables may also be used to connect signals to the

input connectors, but they may have considerable effect on

the accuracy of a displayed waveform. To maintain the

original frequency characteristics of an applied signal,

only high-quality, low-loss coaxial cables should be used.

Coaxial cables should be terminated at both ends in their

characteristic impedance. If this is not possible, use suitable

impedance-matching devices.

INPUT COUPLING CAPACITOR

PRECHARGING

RISE AND CENTER

FALL TIME HORIZONTAL

MEASUREMENT GRATICULE

PERCENTAGE LINE

MARKERS

Figure 8. Graticule measurement markings.

GROUNDING

The most reliable signal measurements are made when

the 2213 and the unit under test are connected by a com-

mon reference (ground lead), in addition to the signal lead or probe. The probe’s ground lead provides the best grounding method for signal interconnection and ensures the maximum amount of signal-lead shielding in the probe cable. A separate ground lead can also be connected from the unit under test to the oscilloscope GND connector

located on the front panel.

4115-16

When the input coupling switch is set to GND, the input

signal is connected to ground through the input coupling

capacitor in series with a

l-MS2

resistor to form a

precharging network. This network allows the input coupling capacitor to charge to the average dc-voltage level of the signal applied to the probe. Thus, any large voltage transients that may accidentally be generated will not be applied to the amplifier input when the input coupling switch is moved from GND to AC. The

precharging

network also provides a measure of protection to the external circuitry by reducing the current levels that can be drawn from the external circuitry during capacitor charging.

The following procedure should be used whenever the probe tip is connected to a signal source having a different dc level than that previously applied, especially if the level difference is more than 10 times the

VOLTS/DIV

dc-

switch setting:

1. Set the AC-GND-DC switch to GND before con-

necting the probe tip to a signal source.

2. Insert the probe tip into the oscilloscope GND

connector.

2213 Operators

3. Wait several seconds for the input coupling capacitor

to discharge.

4. Connect the probe tip to the signal source.

5. Wait several seconds for the input coupling capacitor

to charge.

6. Set the AC-GND-DC switch to AC. The display will

remain on the screen, and the ac component of the signal

can be measured in the normal manner.

INSTRUMENT COOLING

To maintain adequate instrument cooling, the ventilation holes on both sides and rear panel of the equipment cabinet must remain free of obstructions.

INSTRUMENT FAMILIARIZATION

INTRODUCTION

The procedures in this section are designed to assist you in quickly becoming familiar with the 2213. They provide information which demonstrates the use of all the controls,

connectors, and indicators and will enable you to efficiently operate the instrument.

Before proceeding with these instructions, verify that

the POWER switch is OFF (push button out), then plug the power cord into the ac-power-input-source outlet.

If during the performance of these procedures an improper indication or instrument malfunction is noted, first verify correct operation of associated equipment. Should the malfunction persist, refer the instrument to qualified service personnel for repair or adjustment.

The equipment listed in Table 1, or equivalent equipment, procedures.

required to complete these familiarization

Equipment Required for Instrument

Familiarization Procedure

Description

Calibration Generator

Dual-Input Coupler

Cable (2 required)

Adapter

Termination

Standard-ampl Signal amplitude: 2 mV to 50 V. Output signal: 1 -kHz square wave.

Fast-rise repetition rate: 1 to

Rise time: 1 ns or less. Signal amplitude: 100 Aberrations:

Connectors: bnc-female-to-dual-bnc-male.

Impedance: 50 Connectors: bnc.

Connectors: bnc-female-to-bnc female.

Impedance: 50

Table 1

Minimum Specification

itude accuracy:

100

to 1 V.

+2%.

s2.

Length: 42 in.

Connectors: bnc.

50.25%.

kHz.

2213 Operators

BASELINE TRACE

First obtain a baseline trace, using the following

procedure.

1. Preset the instrument front-panel controls as follows:

Display

AUTO INTENSITY

AUTO FOCUS

Vertical (Both Channels)

AC-GND-DC VOLTS/DlV VOLTS/D IV Variable

VERTICAL MODE

INVERT

POSITION

Horizontal

SEC/DIV SEC/DlV

HORIZONTAL MODE X 10 Magnifier

Variable

POSITION DELAY TIME

Range Selector

MULTIPLIER

Trigger

SLOPE LEVEL MODE EXT COUPLING SOURCE VAR

HOLDOFF

INT

Fully counterclockwise (minimum) Midrange

50m (IX) Calibrated detent (fully clockwise)

CH 1 Off (button out) Midrange

0.5

ms Calibrated detent (fully clockwise) NO DLY

Off (variable knob in)

Midrange

0.2 ms Fully counterclockwise

J(lever

Midrange AUTO AC

INT Fully counterclockwise

VERT MODE

up)

NOTE

Normally, the resulting trace will be parallel with the center horizontal graticule line and should not require adjustment. If trace alignment is required, see the under “Opera tor’s Adjustments.

“Trace Rotation

adjustment procedure

”

DISPLAYING A SIGNAL

obtaining a baseli

After

connectan input signal and

1. Connect the calibration generator standard-amplitude

output to both the CH 1 and CH 2 inputs as shown in

Figure 9.

Set the calibration generator for a standard-amplitude

1-kHz

square-wave signal and adjust its output to obtain

a vertical display of 4 divisions.

3. Adjust the Channel 1 POSITION control to center

the display vertically on the screen.

4. Adjust the TRIGGER LEVEL control, if necessary,

to obtain a stable triggered display.

The

TRIG’D

that the sweep is triggered.

5. Rotate the AUTO FOCUS control between its maximum The display should become blurred on either side of the optimum control setting.

indicator should illuminate to indicate

clockwise and counterclockwise positions.

trace,you are now ready to

splay it

NOTE

on the crt screen.

2. Press in the POWER switch button (ON) and allow

the instrument to warm up for 20 minutes.

3. Adjust the AUTO INTENSITY control for desired

display brightness.

4. Adjust the Vertical

controls to center the trace on the screen.

and Horizontal POSITION

6. Set the AUTO FOCUS control for a sharp,

defined display over the entire trace length.

7. Move the display off the screen using the Channel 1

POSITION control.

8. Press in and hold the BEAM FIND push button;

the display should reappear on the screen. Adjust the

Channel 1 and Horizontal POSITION controls to center

the trace both vertically and horizontally. Release the

well-

2213 Operators

BEAM FIND

button; the display should remain within

Set the Channel 1 AC-GND-DC switch to AC.

the viewing area.

6. Observe that the display is centered approximately

at the center horizontal line.9. Adjust the AUTO INTENSITY control counterclock-

wise until the display disappears.

Set the CH 1

10. Press in and hold the BEAM FIND push button;

observe that a 2-division vertical display appears. the display should reappear. Release the BEAM FIND button and adjust the AUTO INTENSITY control to desired display brightness. 8. Rotate the CH

fully counterclockwise.

Using the Vertical Section

Set the Channel 1 AC-GND-DC switch to GND.

2. Adjust the trace to the center horizontal graticule

line.

3. Set the Channel 1 AC-GND-DC switch to DC.

4. Observe that the bottom of the display remains at

the center horizontal graticule line (ground reference).

9. Observe that minimum vertical deflection occurs

when the

VOLTS/DlV

clockwise.

IO. Rotate the CH 1 VOLTS/DIV

clockwise

11.

to the CAL detent.

Select

CH 2 VERTICAL MODE and again perform preceding steps 1 through 10 using Channel Performance should be similar to Channel 1.

VOLTS/DlV

switch to 0.1 (IX) and

VOLTS/DIV

Variable control

Variable contol is fully counter-

Variable control

controls.

fully

CALIBRATION

GENERATOR

DUAL-INP

COUPLE

CABLE

Figure 9. Initial setup for instrument familiarization procedure.

AMPL

OUTPUT

3397-10

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