B+K precision 4012A Manuale utente

INSTRUCTION

MANUAL

Model 4012A

5 MHz

SWEEP FUNCTION

GENERATOR

with DIGITAL DISPLAY

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TEST INSTRUMENT SAFETY

WARNING

Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be

performed where exposed voltage is present. An electrical shock causing 10 milliamps of current to pass through the heart wil l stop

most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a

lethal current under certain conditions. Higher voltages pose an even greater threat because such voltage can more easily produce a

lethal current. Your normal work habits should include all accepted practices to prevent contact with exposed high voltage, and to

steer current away from your heart in case of accidental contact with a high voltage. You will significantly reduce the risk factor if you

know and observe the following safety precautions:

1. Don't expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test

connections in high-voltage circuits. Discharge high-voltage capacitors after removing power.

2. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However, remember

that high voltage may appear at unexpected points in defective equipment.

3. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place

equipment; and make certain such surfaces are not damp or wet.

4. Use the time proven "one hand in the pocket" technique while handling an instrument probe. Be particularly careful to avoid

contacting a nearby metal object that could provide a good ground return path.

5. When testing ac powered equipment, remember that ac line voltage is usually present on some power input circuits such as the

on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is turned

off.

(continued on inside back cover)

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Instruction Manual

for

MODEL 4012A

5 MHz

SWEEP/FUNCTION

GENERATOR

with Digital Display

22820 Savi Ranch Parkway •Yorba Linda, CA 92887

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TABLE OF CONTENTS

TEST INSTRUMENT SAFETY inside front cover

INTRODUCTION .............................................5

SPECIFICATIONS ........................................... 6

CONTROLS AND INDICATORS ..................... 9

OPERATING INSTRUCTIONS .......................11

Frequency and Waveform Selection .................11

Considerations................................................ 12

Duty Cycle Control......................................... 13

TTL/CMOS Output......................................... 14

Sweep Considerations ..................................... 14

Voltage Controlled Frequency Operation............. 14

Output Protection Considerations........................ 15

Function Generator Applications Guidebook .......16

MAINTENANCE................................................17

Fuse Replacement...............................................17

Instrument Repair Service ...................................17

Customer Support ...............................................18

SERVICE INSTRUCTIONS................................19

LIMITED ONE YEAR WARRANTY ................. 20

SPANISH MANUAL ..........................................22

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INTRODUCTION

The B+K Precision Model 4012A Sweep/Function

Generator is a versatile signal source which combines several

functions into one unit - waveform generation, pulse

generation (through variable symmetry), and frequency sweep.

Additionally, the instrument provides the added convenience

of a built-in frequency counter. This permits more accurate

determination of output frequency than is possible with a

simple calibrated dial. Coarse and fine tuning controls permit

precision settability of the output frequency.

With this versatility, the unit has a vast number of

applications in both analog and digital electronics in the

engineering, manufacturing, servicing, educational, and

hobbyist fields.

The heart of the function generator is a VCG (voltage-

controlled generator) that produces precision sine, square, or

triangle waves over the 0.5 Hz to 5 MHz range. This

encompasses subaudible, audio, ultrasonic, and RF

applications. A continuously variable dc offset allows the

output to be injected directly into circuits at the correct

bias level.

The sweep generator offers linear or log sweep with

variable sweep rate and adjustable sweep time.

Variable symmetry of the output waveform converts

the instrument to a pulse generator capable of generating

rectangular waves or pulses, ramp or sawtooth waves, and

slewed sine waves.

In addition to the above features, an external voltage

may be used to control operating frequency. This is useful

in situations where an externally controlled frequency is

desirable.

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SPECIFICATIONS

FREQUENCY CHARACTERISTICS

Waveforms

Sine, Square, Triangle, ± Pulse, ± Ramp

Range

0.5 Hz to 5 MHz in 7 ranges

Resolution

4 digits

Tuning Range

Coarse: 10:1, Fine: ±5% of Coarse Setting

Variable Duty Cycle

15:85:15 Continuously Variable

Operating Modes

Normal, VCG (Voltage Contr+olled Generator)

Frequency Stability

Output frequency will not change more than 0.09% in 15

minutes after 1 hour warmup.

OUTPUT CHARACTERISTICS

Impedance

50Ω ±10%

Level

20V p-p Open-circuit, 10V p-p into 50 Ω

Amplitude Control

Variable, 20 dB range typical

Attenuation

-20 dB ±1 dB

DC Offset

Preset: ±0.1 V typical

Variable: ±10 V open-circuit, ±5 V into

50Ω

SINE WAVE

Distortion

≤3% Typical at 1 KHz

Flatness

±5% (.45 dB)

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SPECIFICATIONS

SQUARE WAVE

Symmetry

0.5Hz to 100 kHz ≤2%

Rise Time

≤120nS

TRIANGLE WAVE

Linearity

≥98% to 100 kHz

TTL OUTPUT

Level 0.8V to 4V p-p + 0.5V p-p

Rise Time ≤20 nS

Duty Cycle 50% typical

CMOS OUTPUT

Max Frequency 2 MHz

Level 4V to 14V ±0.5V p-p,

Continuously variable

Rise Time ≤120nS

VCG (Voltage Controlled Generator)

INPUT

Input Voltage

0 - 10 V ±1 V causes a 100:1 frequency

change

Impedance

10 kΩ ±5%

SQUARE WAVE

Symmetry

0.5Hz to 100kHz ≤2%

Rise Time

≤120 nS

TRIANGLE WAVE

Linearity

≥98% to 100kHz

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SPECIFICATIONS

NOTE: Specifications and information are subject to change without notice. Please visit www.bkprecision.com for the most current product

information.

SWEEP OPERATION

Mode LIN / LOG

Width 100:1,

Continuously variable

Rate 0.5 sec to 30

sec, continuously variable

Sweep Output 0 to 10V

FREQUENCY COUNTER

Accuracy

Time Base Accuracy ±1 count

Time Base Accuracy

±10 PPM (23 °C ±5 °C)

Display

4 digit LED

AC INPUT

120 / 230VAC ±10%, 50 / 60Hz, internal

jumper selectable

DIMENSIONS (H x W x D)

4.5" x 10.5" x 12.25"

WEIGHT

4 lb. (1.8 kg.)

ACCESSORIES

Instruction Manual

Output Cable, BNC to Alligator Clips

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CONTROLS AND INDICATORS

FRONT PANEL (Refer to Fig. 1)

1. POWER Switch. Turns power on and off.

2. RANGE Switch. Selects output frequency range. Seven

ranges from 1 Hz to 10 MHz. Switch indicates maximum

frequency of range and is adjusted with COARSE

FREQUENCY control to 0.1 times the maximum. For

example, if the 100 kHz range is selected, the output

frequency can be adjusted from 10 kHz to 100 kHz.

3. FUNCTION Switch. Selects sine, square, or triangle

waveform at OUTPUT jack.

4. OUTPUT LEVEL Control. Controls the amplitude of the

signal at the OUTPUT jack. Output level can be decreased

by approximately 20 dB with this control.

5. DC OFFSET Control. Enabled by the DC OFFSET Switch

(12). Clockwise rotation from center changes the DC offset

in a positive direction while counterclockwise rotation

from center changes the DC offset in a negative direction.

6. OUTPUT Jack. Waveform selected by FUNCTION switch

as well as the superimposed DC OFFSET voltage is

available at this jack.

7. TTL/CMOS Jack. TTL or CMOS square wave, depending

on the position of the CMOS LEVEL switch (13) is output

at this jack. This output is independent of the OUTPUT

LEVEL and DC OFFSET controls.

8. CMOS LEVEL Control. Rotating this control clockwise

increases the amplitude of the CMOS square wave at the

TTL/CMOS jack.

9. VCG/SWEEP Jack. Controlled by SWEEP EXT/INT

Switch (12). When SWEEP EXT is selected, jack is the

Voltage Controlled Generator input and permits external

control of generator output frequency by a DC voltage

input at this jack. A positive voltage will decrease

frequency. When SWEEP INT is selected the internally

generated sweep voltage is available at this jack for

connection to an oscilloscope.

10. DUTY CYCLE Control. Enabled by the DUTY CYCLE

Switch (14). Rotation from center position adjusts the

duty cycle of the main OUTPUT signal.

11. -20 dB Switch. When engaged, the signal at the

OUTPUT jack is attenuated by 20 dB.

12. SWEEP INT/EXT Switch. When engaged (INT) enables

the sweep mode of operation. Sweep rate is controlled by

SWEEP TIME control (18) and sweep magnitude is

controlled by the SWEEP WIDTH control (16). When

released (EXT), allows external control of generator output

frequency by a DC voltage input at the VCG/SWEEP jack

(9).

13. SWEEP LIN/LOG Switch. When engaged (LOG) selects

logarithmic sweep characteristic and in the released (LIN)

position selects a linear sweep characteristic.

14. DC OFFSET Switch. When engaged, enables operation

of the DC OFFSET control (5).

15.CMOS LEVEL Switch. When engaged, changes the TTL

signal to CMOS signal at the TTL/CMOS jack

CONTROLS AND INDICATORS

Figure 1. Model 4012A Front Panel.

20. SWEEP WIDTH Control. Rotation determines sweep

width by adjusting sweep stop frequency.

21. DUTY CYCLE Switch. When engaged, enables

operation of DUTY CYCLE control (10).

22. SWEEP TIME Control. In sweep mode, rotation

determines amount of time to sweep from the start

frequency to the stop frequency.

23. FINE FREQUENCY Control. Vernier adjustment of the

output frequency for ease of setting frequency.

24. COARSE FREQUENCY Control. Coarse adjustment of

the output frequency from 0.1 to 1 times the selected

range.

16. COUNTER DISPLAY. Displays frequency of internally

generated waveform.

17. GATE LED. Indicates when the frequency counter

display is updated. When the 100K through 10M ranges

are selected, the LED will flash 10 times per second

(every 0.1 seconds). When the 10 through 10K ranges are

selected, the LED will flash once every second and when

the 1 range is selected, the LED will flash every 10

seconds. As the LED turns off, the display is updated.

18. Hz and KHz LED. Indicates whether the counter is

reading in Hz or kHz.

19. Invert Button. Used to invert the output signal.

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