B+K precision 4040A Manuale utente

INSTRUCTION

MANUAL

MANUAL DE INSTRUCCIÓN

Model 4040A

MODELO 4040A

20 MHz SWEEP/FUNCTION

GENERATOR

with FREQUENCY COUNTER

20 MHz GENERADOR DE

BARRIDO/FUNCIONES CON

CONTADOR DE FRECUENCIA

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 will 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)

Instruction Manual

for Model 4040A

20 MHz

SWEEP/FUNCTION GENERATOR

with FREQUENCY COUNTER

22820 Savi Ranch Parkway • Yorba Linda, CA 92887

TABLE OF CONTENTS

TEST INSTRUMENT SAFETY ...........inside front cover

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

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

CONTROLS AND INDICATORS ................................ 8

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

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

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

Burst Operation ......................................................... 14

AM Operation ........................................................... 15

FM Operation ............................................................ 16

TTL/CMOS Output ................................................... 17

Voltage Controlled Frequency Operation ........................17

Sweep Operation............................................................ 18

Use of Frequency Counter with External Signals ............ 18

Output Protection Considerations ................................... 19

Function Generator Applications Guidebook .................. 19

MAINTENANCE ..........................................................20

Fuse Replacement.......................................................... 20

Instrument Repair Service ..............................................20

Customer Support ...........................................................21

WARRANTY SERVICE INSTRUCTIONS .................... 22

LIMITED TWO-YEAR WARRANTY............................ 23

SPANISH MANUAL ......................................................25

INTRODUCTION

The B&K Precision Model 4040A 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 stability of the output frequency.

SPECIFICATIONS

Square Wave

Symmetry: ≤2% 0.2Hz to 100kHz

Rise Time: ≤30ns (Typical)

Overshoot &

Undershoot ≤5%

TRIANGLE WAVE

Linearity: ≥98% to 100kHz

TTL OUTPUT

Level: 0.8V to 2.4V

Rise Time: ≤20 nS

Duty Cycle: 50% typical

CMOS OUTPUT

Max Frequency: 2MHz

Level: 4V to 14V ±0.5V p-p,

continuously variable

Rise Time: ≤120nS

VCG (Voltage Controlled Generator) INPUT

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

change

Impedance: 10kΩ±5%

FREQUENCY CHARACTERISTICS

Waveforms: Sine, Square, Triangle, ± Pulse, ± Ramp

Range: 0.2Hz to 20MHZ in 8 ranges

Resolution:

Tuning Range: Coarse: 10:1, Fine: ± 5% of Coarse

Setting

Variable Duty Cycle 15:85:15 Continuously Variable

Operating Modes Normal, Sweep, VCG, AM, FM, Burst

Frequency Stability: The output will change less than 0.09%

over 15 minutes after 1 hour warmup.

OUTPUT CHARACTERISTICS

Impedance: 50Ω± 10%

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

to 10MHz

Amplitude Control: Variable, 20dB range typical

Attenuation: -20dB ±1dB

Dc Offset: Preset: ±0.V typical

Variable: ±10V open-circuit, ±5V into 50Ω

Sine Wave

Distortion: 0.1Hz to 100KHz: ≤3%

Flatness: ±5% (0.45 dB) 10Hz to 8MHZ

±20 % ( 2.0 dB) 8MHZ to 20MHZ @

3Vp-p

SPECIFICATIONS

SWEEP OPERATION

Mode: LIN / LOG

Width: 100:1, Continuously variable

Rate: 20mS to 2 sec, continuously

variable

Sweep Output: 0 to 2V

Start/Stop

Frequencies: Adjustable

AM MODULATION CHARACTERISTICS

Source: Internal, External

Modulation Ratio: 0 To 100%

INT. Modulation: 1kHz

EXT. Modulation: DC to 500KHz

EXT. Sensitivity: Less than 10V p-p for 100%

modulation

FM MODULATION CHARACTERISTICS

Source: Internal, External

Deviation: 0 to 5%

INT. Modulation: 1kHz

EXT. Modulation: DC to 500kHz

EXT. Sensitivity: Less than 10V p-p for 100%

modulation

BURST CHARACTERISTICS

Source: Internal, External

Burst Width: Continuously variable from 5%

to 90% of internal gating frequency

Repetition Rate: 0.5Hz to 50Hz, internal or DC to

500kHz, external

Burst Frequency: Determined by the main generator

frequency setting. Tone burst is in

integral cycles of frequency being

gated.

FREQUENCY COUNTER

Accuracy: Time Base Accuracy ±1

count

Time Base Accuracy: ±10PPM (23°C ±5°C)

Display: 5 digit LED

External Input:

Frequency: 5Hz to 30MHz

Resolution: 0.1, 1, 10, 100, 1 kHz

Sensitivity: ≤25 mV rms

Impedance: 1 MΩ/100 Pf

POWER SOURCE

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

DIMENSIONS (H x W x D)

10 1/2" x 5 1/2" x 12 3/8" ( 26.67cm x 13.97cm x 31.43cm )

WEIGHT

5.3 lb. (2.4 kg.)

ACCESSORIES

Output Cable, BNC to Alligator Clips

Instruction Manual

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

information.

CONTROLS AND INDICATORS

10. OUTPUT LEVEL Control. Controls the amplitude of

the signal at the OUTPUT jack. Output level can be

decreased by approximately 20dB with this control.

11. DC OFFSET Control. Activated by the DC OFFSET

Switch (4). 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.

12. VCG/MOD INPUT Jack. Controlled by

MODULATION OFF/ON Switch (33). When

MODULATION OFF 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 MODULATION ON is selected, jack

becomes modulation input source.

13. OUTPUT Jack. Waveform selected by

Figure 1. Model 4040A Front Panel.

19 BURST OFF/ON Switch. Selects external or

internal burst gate. Continuous output is obtained

with switch in the OFF position and no external

burst gate is applied.

17. BURST WIDTH Control. Adjusts the duty

cycle of the internal burst gate.

18. % MODULATION Control. Adjusts the

percentage of AM or FM modulation.

CONTROLS AND INDICATORS

27. SWEEP STOP Control. Adjusts the ending sweep

frequency.

28. COARSE FREQUENCY Control. Coarse adjustment

of the output frequency from 0.1 to 1 times the selected

range.

29. SWEEP START Control. Adjusts the starting sweep

frequency.

30. GATE LED. Indicates when the frequency counter

display is updated. When the 200K through 20M ranges

are selected, the LED will flash 10 times per second

(every 0.1 seconds). When the 20 through 20K ranges

are selected, the LED will flash once every second and

when the 2 range is selected, the LED will flash every 10

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

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

reading in Hz or KHz.

32. COUNTER DISPLAY. Displays frequency of internally

generated waveform, or external signal when CNTR

EXT is selected.

33. MODULATION ON/OFF Switch. Enables or disables

modulation of the generator.

34. MODULATION EXT/INT Switch. Selects whether

generator modulation is from the internal 1 KHz source

or from a signal applied to the VCG/MOD INPUT jack.

35. MODULATION FM/AM Switch. Selects Frequency

modulation or Amplitude modulation.

36. GCV OUTPUT. (Located on back panel) Generator

control voltage output. Voltage is proportional to the

generator frequency. When Sweep mode is selected

sweep voltage is present at this jack for connection to an

oscilloscope.

20. .START/STOP Switch. Enables adjustment of the starting

and stopping sweep frequencies. The actual adjustment is

performed by the SWEEP START and SWEEP STOP

controls (29 and 27). START/STOP selection is enabled

only when the SET/RUN switch (21) is set to SET.

21. RUN/SET Switch. Selects sweep set or sweep run

operation. In the SET position, the starting or ending

sweep frequency is continuously present at the output. In

the RUN position, the generator sweeps between the low

and the high frequencies at a rate set by the SWEEP

TIME control.

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

the sweep mode of operation. Sweep rate is controlled by

SWEEP TIME control (25) and sweep length is controlled

by the SWEEP STOP control (27) and the start frequency

is controlled by the SWEEP START control (29). When

released (EXT), allows external control of generator

output frequency by a DC voltage input at the VCG/MOD

INPUT jack (12).

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

logarithmic sweep characteristic and when released (LIN)

selects a linear sweep characteristic.

24. CNTR INT/EXT Switch. Selects the input source for the

counter input.

25. SWEEP TIME Control. In sweep mode, rotation

determines amount of time to sweep from the start

frequency to the stop frequency.

26. FINE FREQUENCY Control. Vernier adjustment of the

output frequency for ease of setting frequency.

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