PRO-TEK B8000FD Series User manual

Protek
Test and Measurement
B8000FD Series
DDS Function Generator
Operators Manual

1
Contents
1 Introduction................…………………………………………………1
1.1 Introduction…………….……………………………………….1
1.2 DDS Technology.……………………………………………....1
1.3 Product Series………………………………………………….2
1.4 General Information……………………………………... …..2
1.4.1 Contents……..…………………………………………….…2
1.4.2 Safety…..…………………………..…………………………2
2 Unit description………………………………………………………..3
2.0 Front panel description.............…..…………………………..3
2.1 Front Panel Outputs….……..…………………………….……3
2.2 Rear panel inputs…………………………………………..…..4
2.3 Front panel controls…….…..………………………………..5
2.4 Front panel button description………….……………………..7
3 Using the front panel buttons………………………………..……...8
3.1 Waveform.....……………………….………………………...8
3.2 Frequency………………...…………………………….…….9
3 .3 Amplitude………..….………………………………….…...10
3.4 Duty Ratio……………..…………….…………….……..……12
3.5 Offset……………………………………………..……………12
3.6 Mode button………………………….….……………..……13
4 Modulation setup menus………………………….…………….…..15
4.1 Linear sweep…………………………………………………15
4.2 Log sweep…………………………………………………....16
4.3 Frequency Shift key……………………………..….……….17
4.4 Phase Shift key…………………………………………..….17
4.5 Amplitude shift key…………………………………………..18
4.6Burst…………………..………………………………………18
4,7FM…………………………………………………………….18
48.Phase modulation…….……………………………………..19

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4.9 Internal Am modulation……………………………………19
4.10 External AM modulation………………………………….20
4.11Demo……………………………………………………….20
5 Multifunction menu…………………………………………………..21
5.1 Config button………………………………...…………….21
5.2 B out ……………….………………………………………21
5.3 Frequency counter……………………………………..…22
5.4 RS232………………………………………………………23
6 External Trigger……………………………….……………………...24
6.1 Trigger button………………………….…………………..24
6.2 Single trigger…………………………………………...….25
6.3 External trigger…………………………………………….25
7 Store/Recall……………………………………………………………26
Appendix technical Specifications ….…………………………... ...27

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1 Introduction
1.1 Introduction
The B8000FD series Digital Synthesized Function
generator have the following features:
zDDS technology for excellent frequency stability,
frequency resolution and the ability to generate very low
frequencies.
zVery precise Sine, Square, triangle, Ramp, Exponential,
Pulse and Sin (X)/X waveforms are generated using
the key board or encoder dial entry
zFSK, ASK, PSK Burst modulation
zLow -54dBC Sine wave distortion.
zLog and linear sweeps
zInternal and External AM and FM modulation.
zDual independent channel outputs;
zBuilt with integrated circuits for high reliability and small
size
zDual back lit LCD display increases the number of
displayed parameters.
zBuilt in 100MHz frequency counter
zRS-232 interface, for connecting to a PC.
1.2 DDS Technology
DDS is the abbreviation for Direct Digital Synthesis. It
completely changes the way waveforms are generated.
With the use of High speed digital circuits, memories and
D/A converters a wide range of highly stable, accurate and
complex waveforms may be generated.

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1.3 Product series
There are four models to choose from in the B8000FD series
of DDS function generators with frequency ranges from 1μHz to
40MHz. These models include:
Model B8003FD B8010FD B8020FD B8040FD
Frequency 3MHz 10MHz 20MHz 40MHz
All models are easy to use and generate Sine, Square, Triangle,
Ramp, Exponential up, Exponential down, Pulse, sin (x)/x and noise
waveforms. They also provide a wide variety of modulations including:
Burst, Frequency shift key, Phase shift key, amplitude shift key, Am,
FM, PM along with Linear and Log sweep. All modulation and
waveform parameter values are entered in to user friendly menus with
a keyboard or an Encoder knob.
1.4 General Information
1.4.1 Contents
z1 B8000FD series DDS Generator
z1 AC power cord
z1 BNC to Alligator clip test lead
z1 Operating manual
1
.4.2 Safety
1) Before operating, read and understand the user manual
thoroughly on how to use this instrument.
2) Before connecting the power cord, verify that line input voltage
(110/220V) is set properly.
3) Use only a fast blow fuse. (250V AC, 0.25A)

FIDE aK
(d) (6)
4) Do not apply voltage to the output connector.
5) Do not apply voltage over 10VP-P to the input connector.
6) . Do not use or store this instrument in a location near heat
source or in a place subject to high humidity.
7) This instrument should only be serviced by a competent
electronics technician
2 Unit Description
10
4 5
89
6
3
2
3
Fig 1
1
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2.0 Panel description
2.1 Front Panel outputs:
There are 3 BNC signal outputs on the front panel.
zMain OUTPUT:cMain output with an impedance of 50 Ω
zSYN:dThis output is a TTL level signal which is active for
all waveforms except Sine and square waves. It is the

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same frequency as the selected waveform at the main
output terminal and is used for synchronizing external
equipment to the generator.
ForSweep, the SYN signal is high during the time the
waveform is sweeping and low during the inactive time the
waveform is waiting for the next sweep to start.
When using FSK the positive portion of the sync signal is
high for the duration the FSK signal (TW) is at the first
frequency and low during the time the signal switches to
the second frequency (TS)
PSK the sync signal is high during the time the PSK
signal is at Zero phase (TW) and low during the time the
signal switches to the Phase shifted signal (TS).
ASK the sync signal is high during the time the ASK signal
is active (TW) and low during the time it is inactive (TS),
waiting the next cycle to start
zB OUT:eSecond output, with an impedance of 600Ω. All
waveforms with a frequency to 20 KHz maybe selected.
This output signal may be used as the modulating signal
when using External AM.
2.2 Rear Panel Inputs
(11) External Trigger input
(12) External Frequency counter input
(13) Ext AM input
(14) AC line Voltage selector
(15) AC input
(16) RS232 connector

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(11)
(12) (13) (14) (15) (16)
2.3 Front Panel controls
The front panel controls consists of:
1) The Numeric keyboardfwhich is used to enter waveform
data (Frequency, amplitude, offset and Duty cycle.) and the
various modulation parameters as will be explained later.
2) The encoder knobgis a Rotary digital encoder used to set
values for the selected waveform parameter such as
amplitude, phase, frequency, etc. When a parameter is
selected a digit in the value will blink. Rotating the encoder
will change the value. When this knob is rotated clockwise,
the blinking digit will increase and when rotated counter
clockwise the blinking will decrease.
3) The Soft buttons hare for selecting the menu items when
the Mode or Config Menus are displayed. The Soft buttons
are assigned to corresponding parameters: Example: When
the MODE key is pressed, the Mode selection menu is
displayed on the LCDlas shown in Figure 2. In this

---------) C._ ) C
 ) C --- ) 
C----->
example, continuous (CW) which is displayed adjacent to
mode is the currently selected item. Pressing the soft
button corresponding to > displays the next group of
modulations.
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Fig 2:
4) The front panel keysiare of 3 types. The first is the single
function buttons that displays waveform, frequency,
amplitude. DC offset and duty ratio values when pressed.
The Soft buttons are not used within these buttons.
5) The second type are the keys that display more than one
menu item on the LCD when pressed. The Mode and
Config keys are examples. These Soft buttons are used to
select items when multiple menu items are displayed.
6) The third type are execution buttons. The Enter key enters
waveform parameter values, the Esc key cancels an input
value after entering it from the key board. The direction key
(◄" & "►)jnavigates through the displayed numerical
value on the LCD and the Trig key for performing single
cycle and external trigger waveform operations.
Mode: Continuous
CW Lin Log fsk >

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2.4 Front panel button description:
z"Mode": When pressed displays the modulation option
menus.
z"Config": This key when pressed selects the B OUT put,
Frequency Counter and RS232 menus.
z"Trig": When Burst, ASK, PSK or FSK modulation has
been selected (see chapter on the Trigger
functions), pressing the “Trig” key, the generator
enters the Single trigger mode. Pressing the Trig
key again the generator will output one
waveform.
The External trigger input is also enabled. A
signal applied to the External trigger input will
externally trigger the generator at the rate of the
External input signal.
z"Enter: Enters and stores the numeric data which has
been entered from the Key board or the rotary
dial
z"Esc: cancels the current keyboard or rotary dial data
operation and displays the data that was
previously entered. If the triggered operation was
previously selected, pressing this key will return
the unit to normal operation.
zKeyboard buttonsfenters data values in to the upper
portion of the display of the selected waveform
parameter. Pressing the ENTER key enters the new
data. If the data entered is incorrect, pressing the

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ESC key will return the display to the previous
value.
zSoft buttons hThese keys are located at the bottom of
the LCD display and are used to select in items in
the "Mode" or "Config" menus. The five buttons are
have a corresponding menu item assigned to them
item and selects this item when pressed (See fig 2).
z" ◄" & "►"jdirection button. This key is a bi- direction key
used to navigate through the waveform data digits
when the Freq., Amp, Duty or Offset menu is
displayed. The value at the top of the LCD will have a
digit blinking. Pressing this key to the left (◄) will
cause the digit to the left to blink. Pressing this key to
the right (►) will cause the digit to the right to blink.
3 Using the Front Panel buttons
3.1 Waveforms (Wavef)
Pressing the "Wavef" button, displays the waveform menu
as shown in Fig 3. This menu displays the waveform to be
changed in blinking characters at the top of the LCD. The
lower portion of the LCD displays the parameters of the
currently selected waveform, frequency and amplitude.
The “blinking” waveform can be changed by rotating the
Encoder knobg. Rotating this knob will step through all 10
waveforms,
Note: Only the Sine wave can be set to the upper frequency
limit of the generator and is determined by the model number.
The square wave upper limit is 5MHz (except the B8003FD

which is 3MHz). All other waveforms have a upper frequency
limit of 1MHz. Exceeding these limits will cause the waveform
to be distorted.
Fig 3
3.2 Frequency (Freq)
Pressing the "Freq." button displays the frequency menu
similar to what is shown in Fig 4. The top portion of the LCD
displays the Frequency value to be changed with a digit blinking
along with its frequency units. The new frequency value is
entered here. The lower portion of the LCD displays the
currently selected waveform, along with its frequency and
amplitude value.
Pressing the ◄" & "►key to the right will cause the digit to
the right to blink. Rotating the Encoder knob clockwise will
increment the blinking digit. Rotating the Encoder knob counter
- clockwise will decrement the Digit. Pressing the
◄" & "►button to the left will cause the digit to the left to blink.
To change the value of the blinking digit use the same
procedures as explained in the above paragraph
Pressing the ◄" & "►button to the Frequency units position
will cause the currently selected frequency units to blink. There
are 5 frequency units to choose from: millihertz (mHz), Hertz
(Hz), Kilohertz (KHz) and Megahertz (MHz). Rotating the
Encoder knob will step through the frequency units. Rotating the
WAVEFORM: sin
Sin 1.0000 kHz 1.00V
9

Encoder knob clockwise while the frequency unit is blinking will
cause the frequency to increase by a factor of 10. Rotating the
Encoder knob counter clockwise will decrease the frequency by
a factor of 10.
Example: If the currently selected frequency is 1.0000000
KHz and the KHz units is blinking, rotating the encoder
clockwise 1 step will increase the frequency to 10.000000 KHz.
Rotating the Encoder knob counter clockwise 1 step will
decrease the frequency to 100.00000 HZ
A frequency value may also be entered using the keyboard.
Pressing a number on the key board will enter the keyboard value (the
previous digits will be cleared) and it will blink. An 8 digit value plus
decimal point may be entered from the Key board and all the entered
digits will be blinking. Pressing the Enter key confirms the new value
and the blinking will stop. NOTE: Pressing the ESC button at any time
while the digits are being entered (blinking) will cause the frequency to
revert back to its previous value.
If the frequency value entered from the keyboard or
encoder know is greater than the upper frequency limit of the
selected waveform, the frequency value will default to the
upper frequency limit of the selected waveform. (See the
specifications for this unit)
Fig 4
3.3 Amplitude (Amp)
Pressing the "Amp" Button displays the amplitude menu similar
to what is shown in Fig 5. The top portion of the LCD displays
Fo = 1.000000 KHz
Sin 1.0000 kHz 1.00V
10

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the amplitude value with a digit blinking along with the amplitude
units. The new amplitude value will be entered here.
Note: The displayed amplitude is in volts peak to peak in to a
50Ωload with an amplitude range of 1.00mV to 10.0 Volts for the
models with frequencies of 20 MHz or less (1.00mV to 3.00V for the
model B8040FD)
The lower portion of the LCD displays the currently selected
waveform, along with its frequency and amplitude value.
Pressing the ◄" & "►button to the right will cause the digit
to the right to blink. To change this digit rotate the Encoder knob
clockwise to increment the digit or rotate the Encoder know
counter clock wise to decrement it.
Pressing the ◄" & "►to the left will cause the digit to the
left to blink and can be changed using the procedure in the
above paragraph
Pressing the ◄" & "►to the Amplitude position will cause
the currently selected amplitude units to blink. The amplitude
units are millivolts and volts. Rotating the Encoder knob
clockwise while the amplitude unit is blinking will cause the
amplitude to increase by a factor of 10. Rotating the Encoder
knob counter clockwise will decrease the amplitude by a factor
of 10.
Example: If the currently selected amplitude is 100 mV and
the mV unit is blinking, rotating the encoder clockwise 1 step will
increase the amplitude by a factor of 10 to 1.00 volts. Rotating
the Encoder knob counter clockwise 1 step will decrease the
amplitude by a factor of 10 to 10.0mV.
The keyboard can also be used to enter an amplitude value.
Entering a digit from the keyboard will clear the current value
and all digits being entered will blink, and then press the Enter
button. If the value entered from the keyboard is wrong and the

digits are blinking, pressing the Esc key will return the amplitude
value to its previous value.
Fig 5
3.4 Duty ratio (Duty)
Pressing “Duty” button displays the Pulse Duty ratio menu
on the LCD as shown in figure 6. The top portion of the LCD
displays the Duty ratio value with a digit blinking along with a %
symbol. The new Duty ratio value is entered here.
Note: The Duty ratio is only valid with a Pulse or pulse
modulated waveform.
Duty ratio values of 0.1% to 99.9% may be entered using
Encoder knob or the keyboard as explained in the paragraphs
on Frequency and Amplitude. Percent is the only unit for duty
ratio.
Fig 6
3.5 Offset
Pressing “Offset” button displays the Voltage Offset menu
AMPLITUDE = 100. mV
Sin 1.0000 kHz 100mV
Pulse Duty = 10.0. %
puls 1.0000 kHz 100mV
12

C._ ) C_ )
C ) C 7 C
on the LCD as shown in figure 7. The top portion of the LCD
displays the offset value with a digit blinking along with a %
symbol. The new Duty ratio value is entered here. The Offset
value may be entered using the encoder dial or the keyboard as
explained in the paragraphs on Frequency and Amplitude. An
offset may be added -100% to + 100% of the waveform value.
Fig 7
3.6 Mode Button
Pressing the Mode” button displays the modulation selection
menu as shown in Fig 8. The first line on LCD displays the
current modulation and in this case Continuous wave (no
modulation) is selected and is also the default modulation. The
second line displays the modulations that may be selected with
a corresponding soft button. The soft button when pressed the
first time displays the selected modulation on the top line,
pressing it again displays the modulation setup menu.
Fig 8
The modulations that can be selected in figure 8 are: Linear
Sweep (Lin) Log sweep (Log), Frequency shift key (fsk). The
soft button that corresponds to the > symbol when pressed
DC OFFSET = 0. %
sin 1.0000 kHz 100mV
Mode: Continuous
CW Lin Log fsk >
13

C._ ..) C._
) L) C )  C__
-------) C._ ) C  ,)  C._ )
displays the next group of modulations as shown in Fig 9
Fig 9
Figure 9 shows the menu for selecting Phase shift key (psk),
Amplitude shift key (ask) and Burst modulations and their
corresponding soft button. Pressing the soft button that
corresponds to the < symbol returns the display to the previous
menu. Pressing the soft button corresponding to the > symbol
displays the next group of modulations and is shown in figure 10
Fig 10
Fig 10 shows the menu for selecting frequency modulation
(fm), Phase modulation (pm) and the amplitude modulation (am)
and their corresponding Soft buttons.
Pressing the soft button corresponding to the > symbol
displays the EXT amplitude selection menu and a waveform
Mode: Continuous
< psk ask burst >
Mode: Continuous
< fm pm am >
14

C__  --------)  C__ .)

C  .) 
C__ ..)
Fig 11
demo as shown in fig 11
4 Modulation set up menus
The following paragraph will explain the various modulation
menus and the parameter that are needed to be set.
4.1 Linear sweep
Pressing the soft button corresponding to the linear sweep
the menu as shown in fig 12 is displayed on the LCD. The first
line displays the selected modulation and the second line
displays the sweep parameters and their corresponding soft
buttons to set these parameters.
Fig 12
F1: Start frequency
F2: Stop frequency
Tw: Sweep time
Ts: The time when the next sweep starts
OK: Confirms the settings and starts the sweep
Mode: Continuous
< extam Demo
MODE: linear sweep
f1 f2 tw ts OK
15

Pressing the soft button that corresponds to F1, the Start
frequency will be displayed on the top line of the menu as shown
in Fig 13. The start frequency and all other parameters are set
and entered using the Encoder dial and the keyboard as
explained on page 9 and page 11 on how to set the generator
frequency and amplitude. Press the Enter button after the F1
frequency is entered.
Fig 13
When all parameters are entered, press the soft button
corresponding to OK to start the linear sweep.
Note: If F1 frequency is greater than F2 the sweep will start
at the frequency entered by F1 and stop at the frequency
entered by F2. If F2 is less than F1 the sweep will start at the
frequency enter at F2 and stop at the Frequency entered at F1,
The range of the start and stop frequencies that can be set is
from 1Hz to the maximum frequency of the generator
4.2 Log sweep
Note: The same parameters, procedures and conditions as
was explained in linear sweep apply for Log sweep.
Pressing the soft button corresponding to the Log sweep
displays the menu as shown in Fig 14.
Fig 14
F1 = 1.0000000 kHz
f1 f2 tw ts OK
MODE: log sweep
f1 f2 tw ts OK
16

F1: Start frequency
F2: Stop frequency
Tw: Sweep time
Ts: the time when the next sweep starts
OK: Confirms the settings and starts the sweep
4.3 Frequency shift keying:
Pressing the soft button corresponding to FSK displays the
menu as shown in figure 15
Fig 15
F1: frequency 1
F2: frequency 2
Tw: the working time of frequency 1
Ts: the working time of frequency 2
OK: Confirms the settings and starts the waveform
4.4 Phase shift keying
Fig 16
Fo: Carrier frequency
Ph: phase difference
MODE: FSK
f1 f2 tw ts OK
MODE: PSK
fo ph tw ts OK
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