B+K precision 4013DDS User manual

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Model 4013DDS
12 MHz Sweep Function
Generator

Model 4013DDS - Instruction Manual
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Limited Two-Year Warranty
B&K Precision warrants to the originalpurchaser that its products and the component parts thereof,
will be free fromdefects in workmanship and materials for a period of two years fromdate of
purchase froman authorized B&K Precision distributor.
B&K Precision will, without 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 a sales
receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by completing the
warranty registration formon www.bkprecision.comwithin 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 Precision shall not be liable for any consequential damages, including without limitation
damages resulting fromloss of use. Some states do not allow limitations of incidental or
consequential damages. So the above limitation or exclusion may not apply to you.
This warranty gives you specific rights and you may have other rights, which vary fromstate-to-
state.
Service Information
Warranty Service: Please return the product in the original packaging with 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 original packaging 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. 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
www.bkprecision.comand click on “service/repair”.
Return all merchandise to B&K Precision with pre-paid shipping. The flat-rate repair charge for Non-
Warranty Service does not include return shipping. Return shipping to locations in North American
is included for Warranty Service only. For overnight shipments and non-North American shipping
fees please contact B&K Precision.
B&K Precision
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com

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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 Operating Instructions
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

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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
WARNINGand CAUTION statements, such as the following examples, denote a hazard and appear
throughout this manual. Follow all instructions contained in these statements.
AWARNING statement calls attention to an operating procedure, practice, or condition, which, ifnot
followed correctly, could result in injury or death to personnel.
ACAUTION 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.

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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 4013DDS Function
Generator.
1.2 DESCRIPTION
The Model 4013DDS 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 and triangle wave outputs over the frequency range from 0.1 Hz to 12 MHz
in one extended range.
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 waveforms
1.3.2 Operating Modes
CONTINUOUS...................................................Output continuous at selected frequency.
SYMMETRY ......................................................Square symmetry is continuously adjustable from 15% to 85%.
SWEEP ………………………………………………………..The output waveform can be linear or logarithmic internally swept,
up or down, over the full unit range. The sweep start and stop

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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 12 MHz for Sine and Square waveforms. To 1 MHz
for Triangle waveforms.
CONTROL.........................................................The frequency is selected with front panel up or down keys and
modified with a rotary digital control.
DISPLAY ..........................................................Up to 4 digits with large, bright LCD, ranging units (MHz, KHz,
Hz and mHz) and decimal point. Waveform 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 variable.
AMPLITUDE ATTENUATOR.................................20 dB.
AMPLITUDE FLATNESS......................................±1 dB to 12 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...................................< -55dBc, 0 - 20 KHz, (<0.25%)
< -50 dBc, 20 KHz - 100 KHz
< -45 dBc, 100 KHz – 1 MHz
< -35 dBc, 1 MHz – 12 MHz
SPURIOUS ...................................................... < -55 dBc, 0 - 1 MHz
TRIANGLE LINEARITY.......................................>99% to 100 KHz.
SQUARE TRANSITION TIMES.............................<20 ns (10% to 90%) at full 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.

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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.
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 4013DDS 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 of the container and seal it with tape bands. Mark the box with
“FRAGILE”.
2.3 INSTRUMENT MOUNTING
The Model 4007DDS is intended for bench use. The unit can be installed in a closed rack or test
stand ifproper airflow is assured for removing about 15W of power dissipation. The instrument

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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 4013DDS 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
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.
Use only fuses of0.5A 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
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.
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 ofgenerator 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

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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 of paragraph 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 .
Section 3
Operating Instructions
3.1 CONTROLS AND CONNECTORS
Front panel controls and connectors are shown in the front view illustration ofthe Model 4013.
Each operating control is described as follows:
1. POWER ON/OFF – Applies or removes AC power to the unit.
2. FREQUENCY – Selects the frequency ofthe 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 ofthe offset control.
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.

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8. -20dB – Attenuates the amplitude of the selected output waveform by 20-dB.
9. DUTY CYCLE ON/OFF – Enables operation ofthe variable duty cycle function.
10. DUTY CYCLE – Adjusts, after pressing the pushbutton, the duty cycle of the Square
waveform, when selected.
11. OUTPUT – BNC connector for output of selected 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 ofexternal devices.
13. SWEEP – The ON selects the Linear, Logarithmic sweep. The SET selects the START
and STOP frequencies ofthe seep and also the RATE repetition ofthe sweep selected.
Front Panel View
3.2 INSTRUMENT INPUTS AND OUTPUTS
The Model 4013 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 ofan
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 ofthe 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.

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3.4 FIRST TIME OPERATION
The following exercise will familiarize the operator with most functions ofthe Model 4013 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 ofan
oscilloscope (set vertical to 2V/Div and horizontal to 1 ms/Div). The oscilloscope should display a
triangle waveform.
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 ofthe 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 ofthe 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 ofthe Square waveform can be changed by pushing the DUTY CYCLE ON button
and rotating the DUTY CYCLE knob. A change ofsymmetry 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

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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 ofthe 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 of the 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 ofthe frequency sensitive characteristics of a device
under test. In the mode the frequency ofthe 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 ofthe 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.

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