Tektronix 212 User manual

COMMITTED TO EXCELLENCE

OPERATORS MANUAL

First Printing NOV 1972

Revised 1981

Re-Typeset NOV 2021

212

OSCILLOSCOPE

TABLE OF CONTENTS

Page

Introduction 1

Safety Considerations 1

Controls and Connectors 1

Operating Power Information 6

General Operating Information 11

Operator’s Adjustments 21

Applications 24

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. TELEQUIPMENT is a registered

trademark of Tektronix U.K. Limited.

Printed in U.S.A. Specification and price change privileges

are reserved.

Tektronix, Inc. • P. O. Box 500 • Beaverton, Oregon 97077

Typeset by Jared Cabot - 2021/11

070-1375-00 212 REV D MAR 1981 1172

212 OSCILLOSCOPE

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

When battery operated, store the AC plug in the

insulated compartment. The RFI circuitry connected

between the instrument common and the AC power

plug can cause small amounts of current from an

elevated reference to be present on the AC power

plug, imposing a possible shock hazard.

CONTROLS AND CONNECTORS

Controls and connectors necessary for operation of the 212

(with the exception of the POWER (BATTERY) indicator on the front

panel) are located on the right side of the instrument. To make full

use of the capabilities of this instrument, the operator should be

familiar with the function and use of each control and connector. A

brief description of each control and connector, along with some of

the more important instrument specifications, are given here.

CAUTION

212 Operators Handbook

1. POWER (BATTERY) Indicator - red light (on front panel) to indicate

when the instrument is on. When light extinguishes, battery charge

is low and about 10 minutes of operating life remain.

VOLTS/DIV - selects vertical deflection factor (vertical VARiable

control must be in CAL position for indicated deflection).

Calibrated position accuracy within 5%.

Vertical system bandwidth;

1 mV/div, 100 kHz; 2 mV/div, 200 kHz; 5 mV/div, 400 kHz;

10 mV/div to 50 V/div, 500 kHz.

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.

2212 Operators Handbook

GND - vertical amplifier input circuit is grounded. The applied input

signal is connected to ground through a large resistor to provide a

pre-charge path for the AC input coupling capacitor.

DC - all components of the input signal are passed to the vertical

amplifier system.

STEP ATTEN BALance - a screwdriver adjustment to balance the

vertical amplifier system for minimum trace shift when switching

deflection factors.

Vertical POSition - controls the vertical position of the appropriate

trace. OFF detent turns the channel off.

10.

11.

VOLTS/DIV VARiable - provides a continuously variable deflection

factor between the calibrated settings of the VOLTS/DIV switch for

the appropriate vertical channel. Extends the maximum deflection

factor to at least 125 volts/div.

12. VERTical GAIN - screwdriver adjustment to set the gain of the

vertical amplifier system.

13. AUTO PRESET - screwdriver adjustment to set the AUTO PRESET

trigger point for automatic trigger operation.

14. Trigger SOURCE - selects the source of the trigger signal.

COMP - the sweep is triggered from a DC coupled sample of the

vertical deflection signal after the vertical switching.

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.

3212 Operators Handbook

15. LEVEL/SLOPE - selects the amplitude point and the slope of a

trigger signal on which the sweep is triggered. When the indicator

dot is to the left of center, the sweep is triggered on the positive-

going slope of the trigger signal; to the right of center, on the

negative-going slope. When the LEVEL/SLOPE control is set to the

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.

16. INTENSITY - controls brightness of CRT display.

4212 Operators Handbook

17. SWP CAL - screwdriver adjustment to provide calibrated sweep

timing.

18. POWER - controls power to the instrument. Does not interrupt

charging current to the internal batteries when the instrument is

connected to an AC line voltage.

19. FOCUS - screwdriver adjustment to obtain a well-defined display.

20. HORIZ MAG - provides continuously variable sweep magnification

to a minimum of approximately five times the sweep rate indicated

by the SEC/DIV switch.

21. HORIZontal GAIN - screwdriver adjustment to set the basic gain of

the horizontal amplifier system.

22. Horizontal POSition - controls the horizontal position of the trace.

23. SEC/DIV - selects horizontal sweep rate (horizontal VAR must be in

CAL position for indicated sweep rate). Calibrated sweep rate

accuracy within 5%.-X-Y position allows for X-Y operation with CH 2

supplying the vertical deflection and CH1 the horizontal deflection.

24. EXT TRIG - banana jack for input of an external trigger signal.

25. COMMON - banana jack to establish common ground between the

212 and the external signal source or equipment under test.

5212 Operators Handbook

OPERATING POWER INFORMATION

Internal Battery Operation

The 212 is designed primarily for operation from the internal

rechargeable batteries. The operating time provided from the

internal batteries depends upon trace intensity, and battery charge

and discharge temperature. Typical operating time from fully

charged batteries at maximum trace intensity when charged and

operated at +20°C to +30°C (+68°F to +86°F) is 4.5 hours. Longest

operating time is provided at lower trace intensity.

The POWER (BATTERY) indicator provides an indication of the

operating power. When the light extinguishes not more than 10

minutes of instrument operating power remains. The 212

possesses an automatic battery protection circuit to prevent

excessive discharge and the resulting battery damage if the

instrument is operated below the battery charge level of

approximately 10 volts.

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.

6212 Operators Handbook

To charge the batteries, connect the instrument to an AC line

and set the POWER switch to the OFF position. Allow at least 16

hours for the batteries to reach full charge. For longest operating

life of the batteries, increase the charge time of the instrument to at

least 24 hours once a month. This procedure balances the charge

on all the cells in the battery and reduces the possibility of any

individual cell becoming reverse charged.

The nickel-cadmium cells will self-discharge when the

instrument is stored and not used for extended periods of time. 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

high humidity, it is recommended that the batteries be run through a

full charge cycle (16 hours) about every two weeks, or that the

instrument be left connected to the AC line.

Typical Charge Capacity (reference to charge/discharge at

+20°C to +30°C):

CHARGE

TEMPERATURE

OPERATING TEMPERATURE

-15oC

(+5oF)

+20oC to +30oC

(+68oF to +86oF)

+55oC

(+131oF)

0oC (+32oF) 40% 60% 50%

+20oC to +30oC

(+68oF to +86oF) 65% 100% 85%

40oC (+104oF) 40% 65% 55%

7212 Operators Handbook

AC Operation

Due to the capacitive line input circuit, sudden voltage

changes may cause damaging input current transients. Avoid

operating this instrument from square-wave inverter supplies,

or other sources that produce large voltage transients.

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. Due to the

circuitry connected with the internal battery charger, the AC power

line voltage must be at least 110 volts for operation in this manner.

Also, when operated with fully-charged batteries from an AC line

below about 110 volts and at a maximum trace intensity, the internal

batteries discharge slowly. Approximately 36 hours of continuous

operation can be obtained with fully charged batteries at maximum

intensity and a 104-volt line. The internal batteries cannot be

recharged while the instrument is being operated from the AC line.

If the instrument is to be operated on a power line other than

110 to 126 V AC, 58 to 62 Hz, refer to Option Information.

CAUTION

212 Operators Handbook

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