B+K precision 4005DDS User manual

Model 4005DDS
5 MHz DDS Function Generator
INSTRUCTION MANUAL

1
1 Safety Summary
The following safety precautions apply to both operating and maintenance personnel
and must be observed during all phases of operation, service, and repair of this
instrument. Before applying power, follow the installation instructions and become
familiar with the operating instructions for this 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 of the 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 of the power cable
meet IEC safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases or
fumes. Operation of any 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 of rendering first aid and resuscitation, is present.

2
DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT
Do not install substitute parts or perform any unauthorized modifications to
this instrument. Return the instrument to B&K Precision 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, if not followed correctly, could result in injury or death
to personnel.
A CAUTION statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in damage to or
destruction of parts or the entire 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.
CAUTION:
This product uses components which can be damaged by
electro-static discharge (ESD). To avoid damage, be sure to
follow proper procedures for handling, storing and
transporting parts and subassemblies which contain ESD-
sensitive components.

3
Compliance Statements
Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union
and other European countries with separate collection systems)
This product is subject to Directive 2002/96/EC of the
European Parliament and the Council of the European
Union on waste electrical and electronic equipment
(WEEE), and in jurisdictions adopting that Directive, is
marked as being put on the market after August 13,
2005, and should not be disposed of as unsorted
municipal waste. Please utilize your local WEEE collection
facilities in the disposition of this product and otherwise
observe all applicable requirements.

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Contents
1Safety Summary .........................................................................................................1
2Introduction.................................................................................................................5
3Installation ...................................................................................................................5
3.1 Initial Inspection ..............................................................................................5
3.2 Input Power Requirements..........................................................................6
4Controls and Indicators ..........................................................................................7
4.1 Front Panel Description ................................................................................7
4.2 Rear Panel Description ..................................................................................8
5Operating Instructions ............................................................................................9
5.1 Function Generator Output..........................................................................9
5.2 Duty Cycle Control........................................................................................ 10
5.3 Function Generator Display Messages................................................. 10
6Specifications ........................................................................................................... 11
7Certification .............................................................................................................. 13
8Maintenance ............................................................................................................. 14
8.1 Preventive Steps............................................................................................ 14
8.2 When the Unit is Not Turning On ........................................................... 14
8.3 Fuse Replacement......................................................................................... 15
8.4 Instrument Repair Service ........................................................................ 15
9Service Information............................................................................................... 16
10 Limited One-Year Warranty............................................................................... 17

5
2 Introduction
Description
The B&K Precision model 4005DDS is a versatile 5 MHz DDS (direct digital synthesis)
function generator with display up to 4 digits. The instrument generates sinusoidal,
triangular, and square waveforms over the 1 Hz to 5 MHz range. The output voltage
can be varied from 0 to 10 Vp-p into 50 ohms or to 20 Vp-p into open circuit. A
continuously variable DC offset allows the output to be injected directly into circuits
at the correct bias level.
Features
Frequency is selectable from 1 Hz to 5 MHz
Sine, square, or triangle waveform output
Direct digital synthesis (DDS) architecture
Bright, easy-to-read LED display
Number pad for quick input of frequency
Front panel push button and pull knob can attenuate output by up to 40 dB
3 Installation
3.1 Initial Inspection
This unit is tested prior to shipment. It is therefore ready for immediate use upon
receipt. The initial physical inspections should be made to ensure that no damage has
been sustained during shipment.
Inspect the packing box on receipt for any external damage. If any external damage is
evident, remove the instrument and visually inspect its case and parts for any
damage. If damage to the instrument is evident, a description of the damage should
be noted on the carrier’s receipt and signed by the driver or carrier agent. Save all
shipping packaging for inspection and contact the distributor from where the
instrument was purchased.

6
Retain the original packing in case subsequent repackaging for return is required. Use
of the original packing is essential.
After the mechanical inspection, verify the contents of the shipment. The items
included with the instrument are:

Power cord

User manual

BNC to BNC cable

BNC to alligator clips
If the contents are incomplete, or if the instrument does not pass the specification
acceptance tests, notify B&K Precision.
3.2 Input Power Requirements
The instrument can operate on 115 or 230 VAC source at 50 or 60 Hz. The line
selector plug on the rear panel allows you to select the line voltage. Before
connecting the power plug to an AC line outlet, be sure to check that voltage selector
plug is set in the correct position corresponding to the line voltage in your location
and the fuse rating is as shown in the table.
Selector
AC Input
Fuse
115V
110 –120 V, 50/60 Hz
0.6A
230V
220 –240 V, 50/60 Hz
0.3A
Table 1 - Fuse Table

7
4 Controls and Indicators
4.1 Front Panel Description
1) POWER SWITCH
Turns power on and off.
2) ATTENUATE KEY
Attenuates the output signal by 20 dB.
3) FREQUENCY RANGE SELECTION BUTTON
Selects output frequency range (Hz, KHz, or MHz).
4) DUTY CYCLE KEY
Used to specify duty cycle of a square waveform.
5) FUNCTION SELECTOR BUTTON
Selects sine, square, or triangle waveform.
6) ENTER KEY
Used to confirm frequency or duty cycle entry.
7) SYNC OUTPUT
TTL level square signal output synchronous with frequency of MAIN OUTPUT.
This output is independent of output level and DC offset controls.
8) MAIN OUTPUT
Waveform selected by FUNCTION SELECTOR BUTTONS at a specified frequency
as well as the superimposed DC OFFSET voltage is available at this output.
2
10
5
12
4
7
8
9
1
11
3
6

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9) AMPLITUDE KNOB
Controls the amplitude of the signal at the MAIN OUTPUT. Pull knob to
attenuate the signal by 20 dB. This can be combined with ATTENUATE KEY for
total of 40 dB attenuation.
10) DC OFFSET
Applies a DC offset to the main signal. Pull knob to turn on. 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.
11) NUMBER PAD
Use these keys to set the frequency value or duty cycle %.
12) LED DISPLAY
Displays the set frequency.
4.2 Rear Panel Description
13) DC FAN
40 mm fan for cooling purposes.
14) KENSINGTON SECURITY SLOT
For use with Kensington locks to secure your product and prevent theft.
15) INPUT AC POWER SELECTOR AND FUSE
Power input socket and fuse compartment. Refer to arrow mark on fuse plug
and mark on panel for selected input line voltage.
13
15
14

9
5 Operating Instructions
5.1 Function Generator Output
Before applying power to the unit, make sure that input voltage is correct and the
ventilation holes are not blocked. Ensure the ventilation fan is working well. It is
necessary to inspect the generated signal with an oscilloscope before connecting it to
any electronic circuit. Hence, use of oscilloscope is mentioned in the procedure. Turn
on the instrument with power on switch provided on the front panel. The display LED
will light up.
1. Select the type of waveform required by pushing the corresponding function
button.
2. Connect the main output signal to CH1 of oscilloscope and the SYNC output
signal to CH2 of oscilloscope. Set the trigger source of oscilloscope to CH2.
3. Set the output frequency of the signal by the frequency control keys. The
display shows the number immediately. If the input number is more than a 4-
digit number, the unit will clear all the digits but keep the last digit number
and start again.
4 Press the frequency unit button in “Range” to set the value of the input
number. The output of the function generator will be the new output.
5. Adjust the amplitude of the signal with the AMPLITUDE KNOB. Pull the knob if
the signal is to be attenuated by 20 dB. If the ATTENUATE KEY is also activated
while the knob is pulled, the signal will be attenuated by 40 dB.
6. Set the DC offset of the signal by the DC OFFSET KNOB to the required level
(-10 V to +10 V).
Note: Check the impedance of the load before connecting. To get an accurate
representation of the signal and prevent reflection, it is important to match this
impedance to the output impedance of the function generator.

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5.2 Duty Cycle Control
The DUTY CYCLE KEY can be used to alter the symmetry of a square waveform.
Symmetry variation amounts to changing the duty cycle, a ratio of “high” to “low”
time, effectively converting the instrument into a pulse generator.
1. Press the DUTY CYCLE KEY and the display will blink.
2. Use the number keys to input the duty cycle percentage value (between 20% -
80% can be entered).
3. Press the ENTER KEY to execute duty cycle adjustment. The instrument will then
return to the frequency display.
4. If you want to change the duty cycle percentage value while the instrument is
under duty cycle mode, repeat steps 1-3 above.
To turn off duty cycle, press the DUTY CYCLE KEY two times and the duty cycle LED
will turn off.
Note: The duty cycle adjustment mode only functions for a square waveform and at
frequencies below 3 MHz.
5.3 Function Generator Display Messages
The LED display will show 1.000 kHz after power on. If the user inputs a frequency
value, the LED display will blink until the user presses the ENTER KEY to execute it. If
there is an input error, the LED display will show one of the following messages: Err-
02, Err-03, Err-04, or Err-05. The display will hold this error message for about 3
seconds and then return to the previous display.
Error Code
Description
Err-02
Input value is too large
Err-03
Input value is too small
Err-04
Over the key waiting time, did not press ENTER KEY
Err-05
Duty cycle frequency is higher than 3 MHz
Table 2 - Error Codes

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6 Specifications
4005DDS
Frequency Characteristics
Waveforms
Sine, Square, Triangle
Range
1 Hz to 5 MHz
Resolution
4 digits or 1 Hz
Accuracy
0.02% (200 ppm)*
Frequency Stability
Output will change less than 1 ppm within a 15 minute
interval and less than 2 ppm within a 24 hour interval.
Output Characteristics
Impedance
50 Ω ± 2%
Amplitude Range
Variable control from 20 mVpp to 20 Vpp (open circuit);
10 mVpp to 10 Vpp (into 50 Ω)
Attenuation
-20 dB ± 2%, -40 dB ± 2%
DC Offset
Variable ±10 V (open circuit); ±5 V (into 50 Ω)
Duty Cycle
Adjustable 20% - 80% to 3 MHz for square
Sine Wave
Harmonic Distortion
-50 dBc, DC to 20 kHz
-30 dBc, 20 kHz to 5 MHz
Flatness
± 0.3 dB to 1 MHz, ± 1 dB to 5 MHz
Square Wave
Symmetry
± 2% to 100 kHz, ± 5% to 5 MHz
Rise Time
≤ 35 ns
Triangle Wave
Linearity
≥ 98% to 100 kHz, ≥ 95% to 5MHz

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SYNC Output
Level
≥ 3 V
Rise Time
≤ 25 ns
General
AC Input
115/230 VAC, 50/60 Hz
Operating Temperature
32 °F to 104 °F (0 °C to 40 °C)
Humidity
10% - 80% R.H.
Storage Temperature
-4 °F to 158 °F (-20 °C to 70 °C)
Storage Humidity
0% - 90% R.H.
Dimensions (W x H x D)
11” x 4” x 11.7” (279.4 x 101.6 x 297.2 mm)
Weight
5.05 lbs (2.3 kg)
Supplied Accessories
Instruction manual, power cord, BNC to BNC cable, BNC to
alligator clips
*Applies to frequencies ≥ 1 kHz.
NOTE: All specifications apply to the unit after a temperature stabilization time
of 15 minutes. Specifications and information are subject to change without
notice.
To ensure the most current version of this manual, please download the current
version here: http://www.bkprecision.com/search/manual/4005DDS
For current up-to-date product information, please visit www.bkprecision.com

13
7 Certification
CE Compliant
CE Declaration of Conformity
The function generator meets the requirements of 2006/95/EC Low Voltage Directive
and 2004/108/EC Electromagnetic Compatibility Directive.
Low Voltage Directive
-EN61010-1:2001
oSafety requirements for electrical equipment for measurement,
control, and laboratory use.
EMC Directive
-EN 61000-6-2:2005
-EN 61000-6-4:2007
-EN 61326-1:2006
oElectrical equipment for measurement, control, and laboratory use.

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8 Maintenance
8.1 Preventive Steps
Please follow these preventive steps to ensure the proper operation of your
instrument.
Never place heavy objects on the instrument.
Never place a hot soldering iron on or near the instrument.
Never insert wires, pins, or other metal objects into ventilation fan.
Never move or pull the instrument with power cord or output lead. More
importantly, never move the instrument when the power cord or output
lead is connected.
Do not obstruct the ventilation holes in the rear panel as this will increase
the internal temperature.
Do not operate the instrument with the cover removed unless you are a
qualified service technician.
Clean and recalibrate the instrument on a regular basis to keep the
instrument looking nice and working well.
Remove any dirt, dust, and grime whenever they become noticeable on the
outside cover using a soft cloth moistened with a mild cleaning solution.
8.2 When the Unit is Not Turning On
Check if the power ON/OFF switch is turned ON. If not, then check the power cord.
Please make sure that the power cord is properly connected to the unit. Please also
check the main switch and ensure that the AC supply at your site is the same as the
one mentioned at the rear chassis of the unit. Check for a blown fuse.

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8.3 Fuse Replacement
If the fuse blows, the LED will not light and the instrument will not operate. Replace
only with the correct value fuse. Refer to Table 1 - Fuse Table for fuse values.
The fuse is located on the rear panel adjacent to the power cord receptacle.
Remove the fuse holder assembly as follows:
1. Unplug the power cord from the rear of the instrument.
2. Insert a small screwdriver in the fuse holder slot (located between fuse holder
and receptacle).
When reinstalling fuse holder, be sure that the fuse is installed so that the correct
line voltage is selected. To verify this, check the inscription on the surface of the fuse
box. At the top left and bottom right corner, the line voltage rating is labeled along
with a small arrow. Pick the line voltage to use and match the arrow on the bottom
right corner. On the rear panel, there is also a label that says “LINE VOLT.” with an
arrow. Match the line voltage inscription of the fuse box to this arrow to select that
line voltage.
8.4 Instrument Repair Service
Because of the specialized skills and test equipment required for instrument repair
and calibration, many customers prefer to rely upon B&K Precision for this service.
We maintain a network of B&K Precision authorized service agencies for this
purpose. To use this service, even if the instrument is no longer under warranty,
follow the instructions given in the Warranty Service Instructions section of this
manual. There is a nominal charge for instruments out of warranty.

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9 Service Information
Warranty Service: Please go to the support and service section on our website at
www.bkprecision.com to obtain an RMA #. Return the product in the original
packaging with proof of purchase to the address below. Clearly state on the RMA the
performance problem and return any leads, probes, connectors, and accessories that
you are using with the device.
Non-Warranty Service: Please go to the support and service section on our website
at www.bkprecision.com to obtain an RMA #. Return the product in the original
packaging to the address below. Clearly state on the RMA the performance problem
and return any leads, probes, connectors, and accessories that you are using with the
device. Customers not on an open account must include payment in the form of a
money order or credit card. For the most current repair charges, please refer to the
service and support section on our website.
Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-
rate repair charge for Non-Warranty Service does not include return shipping.
Return shipping to locations in North America is included for Warranty Service.
For overnight shipments and non-North American shipping fees, please contact
B&K Precision Corp.
B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
714-921-9095
Include with the returned instrument your complete return shipping
address, contact name, phone number, and description of problem.

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10 Limited One-Year Warranty
B&K Precision Corp. warrants to the original purchaser that its products and the
component parts thereof will be free from defects in workmanship and materials,
for a period of one year from date of purchase.
B&K Precision Corp. 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 form of a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by
completing a warranty registration form on our website www.bkprecision.com
within 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 Corp. shall not be liable for any consequential damages, including
without limitation, damages resulting from loss 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 from state-to-state.
B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
714-921-9095

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