BK Precision 4007DDS User Manual

Model 4007DDS

7 MHz Sweep Function Generator

Model 4007DDS - Instruction Manual

Limited Two-Year Warranty

B&K Precision warrants to the originalpurchaser that its products and the component parts thereof, willbe free fromdefects in w orkmanship and materials for a period of two years fromdate of purchase froman authorized B&K Precision distributor.

B&K Precisionw ill, w ithout charge, repair or replace, at its option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the formof asales receipt.

To obtain warranty coverage in the U.S.A., this product must be registered by completing the warranty registration formon ww w.bkprecision.comw ithin fifteen (15) days of purchase.

Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs. The warranty is void if the serial number is altered, defaced or removed.

B&K Precisionshallnot be liable for any consequentialdamages, including without limitation damages resulting fromloss of use. Some states do not allow limitations of incidentalor consequentialdamages. So the above limitationor exclusion may not apply to you.

This warranty gives you specific rights and you may have other rights, w hich vary fromstate-tostate.

Service Information

Warranty Service: Please return the product in the original packaging w ith proof of purchase to

the address below. Clearly state in writing the performance problemand return any leads, probes, connectors and accessories that you are using with the device.

Non-Warranty Service: Return the product in the originalpackaging to the address below. Clearly state in w riting the performance problemand return any leads, probes, connectors and accessories that you are using w iththe device. Customers not on open account must include payment in the formof a money order or credit card. For the most current repair charges please visit ww w.bkprecision.comand click on “service/repair”.

Return all merchandise to B&K Precision with pre-paid shipping. The flat-rate repair charge for NonWarranty Service does not include return shipping. Return shipping to locations in North American is included for Warranty Service only. For overnightshipments and non-North American shipping fees please contact B&K Precision.

B&K Precision 22820 Savi Ranch Parkway Yorba Linda, CA 92887 ww w.bkprecision.com

714-921-9095

Include with the returned instrument your complete return shipping address, contact name, phone number and description of problem.

Contents

Section 1 Introduction

1.2 DESCRIPTION......................................................................................... 5

1.3 SPECIFICATIONS.................................................................................... 5

1.4 TECHNICAL SUPPORT ........................................................................... 6

Section 2 Installation

2.1 INTRODUCTION..................................................................................... 7

2.3 INSTRUMENT MOUNTING...................................................................... 7

2.4 POWER REQUIREMENTS........................................................................ 7

2.5 GROUNDING REQUIREMENTS................................................................ 7

2.7 ACCEPTANCE CHECK............................................................................ 8

Section 3 OperatingInstructions

3.1 CONTROLS AND CONNECTORS............................................................. 9

3.2 INSTRUMENT INPUTS AND OUTPUTS................................................... 10

3.4 FIRST TIME OPERATION........................................................................ 10

3.5 DETAILED OPERATING INSTRUCTIONS................................................. 11

Model 4007DDS - Instruction Manual

Safety Summary

The following safety precautions apply to both operating and maintenance personnel and must be observed during all phases ofoperation,service, and repair ofthis instrument. Before applying power, follow the installation instructions and become familiar with the operating instructions for this instrument.

Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards ofdesign, manufacture, and intended use ofthe instrument. B&K assumes no liability for a customer’s failure to comply with these requirements. This is a Safety Class I instrument.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. This instrument is grounded through the ground conductor ofthe supplied, three-conductor ac power cable. The power cable must be plugged into an approved three-conductor electrical outlet. Do not alter the ground connection. Without the protective ground connection, all accessible conductive parts (including control knobs) can render an electric shock. The power jack and mating plug ofthe power cable meet IEC safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence offlammable gases or fumes. Operation ofany electrical instrument in such an environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUITS

Instrument covers must not be removed by operating personnel. Component replacement and internal adjustments must be made by qualified maintenance personnel. Disconnect the power cord before removing the instrument covers and replacing components. Under certain conditions, even with the power cable removed, dangerous voltages may exist. To avoid injuries, always disconnect power and discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt any internal service or adjustment unless another person, capable ofrendering first aid and resuscitation, is present.

Do not install substitute parts or performany unauthorized modifications to this instrument. Return the instrument to vendor for service and repair to ensure that safety features are maintained.

WARNINGS AND CAUTIONS

WARNING and CAUTION statements, such as the following examples, denote a hazard and appear

throughout this manual. Follow all instructions contained in these statements. A WARNING statement calls attention to an operating procedure, practice, or condition, which, ifnot

followed correctly,could result in injury or death to personnel. A CAUTION statement calls attention to an operating procedure, practice, or condition, which, ifnot

followed correctly,could result in damage to or destruction ofpart or all ofthe product.

WARNING: Do not alter the ground connection. Without the protective ground

connection, all accessible conductive parts (including control knobs) can render an electric shock. The power jack and mating plug of the power cable meet IEC safety standards.

WARNING: To avoid electrical shock hazard, disconnect power cord before removing

covers. Refer servicing to qualified personnel.

CAUTION: Before connecting the line cord to the AC mains, check the rear panel AC

line voltage indicator. Applying a line voltage other than the indicated voltage can destroy the AC line fuses. For continued fire protection, replace fuses only with those of the specified voltage and current ratings.

Section 1

Introduction

1.1 SCOPE

This manual contains installation instructions, test procedures, operation procedures and troubleshooting information required to operate, test and maintain the Model 4007DDS Function Generator.

1.2 DESCRIPTION

The Model 4007DDS is a versatile, high performance function generator. Implemented using advance digital technologies based on DDS topology, the units generates superb quality waveforms with high precision and stability.

It provides sine & square wave outputs over the frequency range from 0.1 Hz to 7 MHz in one extended range (triangle/ramped wave outputs to 100KHz).

An auxiliary TTL output at the generator frequency is available to synchronize external devices. The output voltage can be varied from 0V to 10V peak-to-peak into 50 ohms or to 20V into open circuit. A front panel pushbutton can attenuate the output by 20 dB. The DC level of the output can be adjusted using the offset control.

1.3 SPECIFICATIONS

1.3.1 Waveforms

Sine, square and triangle wavef orms

1.3.2 Operating Modes

CONTINUOUS...................................................Output continuous at selected f requency.

SYMMETRY ......................................................Square symmetry is continuously adjustable from 15% to 85%.

Model 4007DDS - Instruction Manual

SWEEP ………………………………………………………..The output waveform can be linear or logarithmic internally swept,

up or down, over the full unit range. The sweep start and stop

frequencies can be independently adjusted and the sweep

rate can be set from 100ms to 30s.

1.3.3 Frequency Characteristics

RANGE.............................................................0.1 Hz to 7 MHz f or Sine and Square wavef orms. To 100 KHz

for Triangle wavef orms.

CONTROL.........................................................The f requency is selected with front panel up or down keys and

modif ied with a rotary digital control.

DISPLAY ..........................................................Up to 4 digits with large, bright LCD, ranging units (MHz, KHz,

Hz and mHz) and decimal point. Wavef orm accuracy is 0.01% (100 ppm).

1.3.4 Output Characteristics

AMPLITUDE RANGE ..........................................Up to 10V p-p into 50(20V p-p into open circuit)

AMPLITUDE CONTROL ......................................>20 dB continuously v ariable.

AMPLITUDE ATTENUATOR.................................20 dB.

AMPLITUDE FLATNESS......................................±1 dB to 7 MHz.

OFFSET RANGE................................................Variable up to ±10V (±5V into 50). Absolute peak amplitude

plus offset limited to ±10V (±5V into 50).

OUTPUT IMPEDANCE........................................50

OUTPUT PROTECTION ......................................The generator main output is non-destructively protected

against short circuit to ground or to any voltage practically

available in electronic laboratories.

1.3.5 Waveform Characteristics

HARMONIC DISTORTION...................................< -50dBc, 0 - 20 KHz, (<0.3%)

< -40 dBc, 20 KHz - 100 KHz < -35 dBc, 100 KHz – 1 MHz

< -30 dBc, 1 MHz – 7 MHz

SPURIOUS ...................................................... < -50 dBc, 0 - 1 MHz

TRIANGLE LINEARITY.......................................>99% to 100 KHz.

SQUARE TRANSITION TIMES.............................<25 ns (10% to 90%) at f ull output amplitude terminated into

50.

1.3.6 Inputs and Outputs

SYNC OUT.......................................................TTL level square wave at generator frequency, in phase with

main output and 50impedance. Can drive > 20 TTL loads.

1.3.7 General

OPERATING TEMPERATURE..............................0°C to +50°C

POWER REQUIREMENTS ..................................100V–240V , ± 10%, 48–66 Hz single phase, <25 VA.

DIMENSIONS....................................................8.4 inch (213 mm) wide; 8.3 inch (210 mm) deep;

3.5 inch (88 mm) high, without bumpers.

WEIGHT ...........................................................Aprox 2 kg

REGULATORY STANDARDS ........ .....................IEC 1010-1, Insulation category II, Pollution Degree 2.

EMC.................................................................EN50081-1 and EN50082-1.

CE Labeled

NOTES .............................................................Specifications apply at 25±5°C ambient temperature and after

30 minutes warm up.

Specifications are subject to change without notice.

For the most current product information please visit www.bkprecision.com.

1.4 TECHNICAL SUPPORT

Ifthis product fails to operate upon arrival, contact your B&K PRECISION dealer or the factory to arrange for service or exchange.

To arrange technical assistance or for service, contact the factory at:

B&K Precision Corp. 22820 Savi Ranch Parkway Yorba Linda, CA 92887 714-921-9095 www.bkprecision.com

Section 2

Installation

2.1 INTRODUCTION

This section contains installation information, power requirements and an acceptance check for the Model 4007DDS Function Generator.

2.2 MECHANICAL INSPECTION

This instrument was carefully inspected before shipment. Upon receipt, inspect the instrument for damage that might have occurred in transit. Ifthere is damage due to shipping, file a claim with the carrier who transported the unit. The shipping container and packing material should be saved in case reshipment is required. Ifthe original container is not be used, then use a heavy carton box. Wrap the unit with plastic and place cardboard strips across the face for protection. Use packing material around all sides ofthe container and seal it with tape bands. Mark the box with “FRAGILE”.

2.3 INSTRUMENT MOUNTING

Model 4007DDS - Instruction Manual

The Model 4007DDS is intended for bench use. The unit can be installed in a closed rack or test stand if proper airflow is assured for removing about 15W of power dissipation. The instrument does not require special cooling when operated within conventional temperature limits. The instrument includes a front feet tilt mechanism for optimum panel viewing angle.

2.4 POWER REQUIREMENTS

The Model 4007DDS can operate from 115/230 Vac, 50/60Hz. The maximum power consumption is less than 25VA.

CAUTION: Before connecting the line cord to the AC mains, check the rear panel AC

Use only fuses of 0.5A SLO-BLO or IEC127 T type rated for 250V. The ac line fuse is located in the Fuse Holder Assembly. To access the fuse, first disconnect the power cord and then remove the fuse cartridge.

2.5 GROUNDING REQUIREMENTS

WARNING: Do not alter the ground connection. Without the protective ground

connection, all accessible conductive parts (including control knobs) can render an electric shock. The power jack and mating plug of the power cable meet IEC safety standards.

2.6 SIGNAL CONNECTIONS

Use RG 58 coaxial cables for all input and output signals to and from the unit.

2.7 ACCEPTANCE CHECK

This acceptance check is a general verification of generator operation. Set the power on and allow a 15-minute warm-up period. Should a malfunction be found, refer to the Technical Service information on page 6 of this manual.

2.7.1 Output Level

Connect an oscilloscope to the instrument output. Set the Model 4007 controls as follows:

WAVEFORM...................SINE

FREQUENCY...................1 KHz

OFFSET ..........................OFF

ATTENUATOR................OUT

AMPLITUDE...................FULL CW

DUTY CYCLE .................OFF

Observe a 20V peak-to-peak sine wave on the scope display. Connect a 50 ohms feed through between the unit and a oscilloscope, and verify a 10V peak-to-peak waveform on display. Change the amplitude control position to decrease the output voltage. Push the attenuator pushbutton and measure an attenuation factor of10 for the 20 dB step. Repeat paragraph 2.7.1 for triangle and square wave output.

2.7.2 Offset Control

With the set up of 2.7.1, push the offset control. Rotate the offset knob from full CCW to full CW and observe a waveform change from negative to positive level. The maximum DC plus peak is limit to ±10V (un-terminated) or ±5V (50 ohms terminated).

2.7.3 Frequency

Connect a counter to the instrument output. Set the instrument controls as follows:

WAVEFORM...................SINE

OFFSET ..........................OFF

ATTENUATOR................OUT

AMPLITUDE...................MIDRANGE

DUTY CYCLE .................OFF

Change the frequency and range and read the counter indications. The reading should fall between instrument specifications.

2.7.4 Sync Output

Connect the scope to the SYNC output. Use the set up ofparagraph 2.7.1. Observe a square wave, ofno less than 2V amplitude, and with 50% symmetry.

2.7.5 Symmetry

With the set up of paragraph 2.7.1, select Square waveform and push the DUTY CYCLE ON control. Rotate the DUTY CYCLE knob from full CCW to CW and observe a waveform symmetry change .

Model 4007DDS - Instruction Manual

3.1 CONTROLS AND CONNECTORS

Front panel controls and connectors are shown in the front view illustration of the Model 4007. Each operating control is described as follows:

1. POWER ON/OFF – Applies or removes AC power to the unit.

2. FREQUENCY – Selects the frequency of the output waveform.

3. RANGE SWITCHES – Multiply or divide by 10 the selected frequency for faster setting.

4. WAVEFORM – Select Sine, Triangle and Square output.

5. OFFSET ON/OFF – Enables operation of the offset control.

Section 3

Operating Instructions

6. OFFSET – Sets the DC offset level ofthe output waveform. The maximum peak plus DC level is limited to ±10V (non terminated) or clipping ofthe waveform will occur.

7. OUTPUT LEVEL – Varies the amplitude of the selected waveform. The range is over 20dB.

8. -20dB – Attenuates the amplitude ofthe selected output waveform by 20-dB.

9. DUTY CYCLE ON/OFF – Enables operation of the variable duty cycle function.

10. DUTY CYCLE – Adjusts, after pressing the pushbutton, the duty cycle ofthe Square waveform, when selected.

11. OUTPUT – BNC connector for output ofselected waveform; 20V peak-to-peak into open circuit or 10V peak-to-peak into 50 ohms.

12. SYNC OUT – A square wave with TTL levels in phase with the main output. Useful for synchronization of external devices.

13. SWEEP – The ON selects the Linear, Logarithmic sweep. The SET selects the START and STOP frequencies of the seep and also the RATE repetition ofthe sweep selected.

Front Panel View

3.2 INSTRUMENT INPUTS AND OUTPUTS

The Model 4007 main output impedance is 50. The output can deliver up to 10V peak-to-peak waveforms into a 50 load. Proper signal loading and connection is necessary for the generator main output to meet its specifications. An RG-58 coaxial cable equipped with BNC connectors and terminated with a 50 feed through termination is recommended. Using the 50 terminator minimizes signal reflection and power losses on the line due to the impedance mismatch. At higher frequencies, an un-terminated or improperly terminated output will cause aberrations on the output waveform.

Impedance Matching

Ifthe waveform generator is driving a high impedance, such as the 1 M input impedance of an oscilloscope vertical input, connect the transmission line to a 50 ohms attenuator or a 50 ohms termination and to the oscilloscope input. The attenuator isolates the input capacitance of the device and terminates the waveform generator properly.

3.3 SYNC OUTPUT

A square wave output signal at the main output frequency is available at this output, producing TTL levels with a 50 source impedance. This output is protected from short circuit and can drive a minimum of20 TTL loads. Leads connected to the SYNC OUT should be as short as possible to prevent rounding of the TTL pulse. The SYNC output signal symmetry is changed by using the DUTY CYCLE control for all selected waveforms.

3.4 FIRST TIME OPERATION

The following exercise will familiarize the operator with most functions ofthe Model 4007 function generator. Preset the controls as follows:

WAVEFORM...................SINE

DUTY CYCLE .................OFF

OFFSET .........................OFF

ATTENUATOR................OFF

AMPLITUDE...................CENTERED

Connect a 50 coaxial cable, terminated into a 50 feedthrough, to the vertical input of an oscilloscope (set vertical to 2V/Div and horizontal to 1 ms/Div). The oscilloscope should display a triangle waveform.

Model 4007DDS - Instruction Manual

1. Alternately press the sine, square and triangle pushbuttons and observe the different wave shapes. Return to the sine function.

2. Rotate the frequency knob and press up and down range switches while observing the change in frequency of the displayed waveform.

3. Push the DUTY CYCLE ON button. Select the SQUARE wave. Rotate the control while observing the change in the duty cycle of the waveform

4. Alternately press the 20 dB attenuator button and rotate the AMPLITUDE control to verify that the waveform amplitude changes. Return these controls to the preset condition.

5. Push the OFFSET ON button and rotate the OFFSET control. Notice the change in DC level ofthe displayed waveform. Return these controls to the preset condition.

3.5 DETAILED OPERATING INSTRUCTIONS

3.5.1 Frequency Setting

The frequency of the generator is changed by turning the FREQUENCY control. The frequency range is selected by pressing the up or down range pushbuttons. The waveform output frequency is shown on the LCD display.

3.5.2 Variable Symmetry

The symmetry of the Square waveform can be changed by pushing the DUTY CYCLE ON button and rotating the DUTY CYCLE knob. A change of symmetry from 15% to 85% can be obtained.

3.5.3 Output Attenuation

The pushbutton attenuator of20 dB attenuates the waveform by a factor of10.. In order to achieve low noise waveforms at low levels, use proper attenuation and keep the amplitude control far from its maximum CCW position.

3.5.4 Offset Output

DC voltage appears at the main output by pushing the OFFSET ON button. By rotating the OFFSET control knob from CCW to CW, the output level and polarity are changed from negative to positive. This level is also controlled by the output attenuator. DC offset is achieved by adding the above DC output to any of the output waveforms selected by pressing the function buttons. A maximum open circuit offset voltage of ±10V can be obtained. It should be noted that the peak voltage ofthe signal, including DC and AC cannot exceed ±10V into open circuit and ±5V into 50. The maximum current which can be taken from the output in DC or AC modes is limited to 100 mA maximum.

3.5.5 Sweep Operation

The internal sweep mode allows an overview of the frequency sensitive characteristics of a device under test. In the mode the frequency of the selected waveform is swept from the selected start to selected stop frequency. When the stop frequency is reached, the instrument resets to the start frequency, and repeats. The SWEEP SET pushbutton selects the setting of the sweep START, sweep STOP and sweep RATE by using the main frequency control. The parameter being selected is displayed on the LCD. The SWEEP ON pushbutton selects the linear or logarithmic sweep and the sweep OFF.

Model 4007DDS - Instruction Manual

BK Precision 4007DDS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual