PeakTech 4065 User manual

PeakT
ech
®
4065
Operation manual
DDS Arbitrary
Waveform enerator

1. Safety Precautions
This product complies with the requirements of the following European Community Directives: 2004/108/EG
(Electromagnetic Compatibility) and 2006/95/EG (Low Voltage) as amended by 2004/22/EC (CE-Marking).
Overvoltage category II; pollution degree 2.
To ensure safe operation of the equipment and eliminate the danger of serious injury due to short-circuits
(arcing), the following safety precautions must be observed.
Damages resulting from failure to observe these safety precautions are exempt from any legal claims
whatever.
* The instrument must be set up so that the power plug can be removed from the socket easily.
* Prior to connection of the equipment to the mains outlet, check that the available mains voltage
corresponds to the voltage setting of the equipment.
* Connect the mains plug of the equipment only to a mains outlet with earth connection.
* Do not place the equipment on damp or wet surfaces.
* Do not cover the ventilation slots of the cabinet to ensure that the air is able to circulate freely inside.
* Do not insert metal objects into the equipment by way of the ventilation slots.
* Do not place water filled containers on the equipment (danger of short-circuit in case of knock over of the
container).
* Do not exceed the maximum permissible input ratings (danger of serious injury and/or destruction of the
equipment).
* To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking
any resistance measurements.
* Check test leads and probes for faulty insulation or bare wires before connection to the equipment.
* To avoid electric shock, do not operate this product in wet or damp conditions. Conduct measuring works
only in dry clothing and rubber shoes, i. e. on isolating mats.
* Comply with the warning labels and other info on the equipment.
* The measurement instrument is not to be to operated unattended.
* Do not subject the equipment to direct sunlight or extreme temperatures, humidity or dampness.
* Do not subject the equipment to shocks or strong vibrations.
* Do not operate the equipment near strong magnetic fields (motors, transformers etc.)
* Keep hot soldering irons or guns away from the equipment.
* Allow the equipment to stabilize at room temperature before taking up measurement (important for exact
measurements).
* Do not input values over the maximum range of each measurement to avoid damages of the meter.
* Use caution when working with voltages above 35V DC or 25V AC. These Voltages pose shock hazard.
* Periodically wipe the cabinet with a damp cloth and mid detergent. Do not use abrasives or solvents.
* The meter is suitable for indoor use only
* Do not operate the meter before the cabinet has been closed and screwed safely as terminal can carry
voltage.
* Do not store the meter in a place of explosive, inflammable substances.
* Do not modify the equipment in any way
* Do not place the equipment face-down on any table or work bench to prevent damaging the controls at
the front.
* Opening the equipment and service – and repair work must only be performed by qualified service
personnel
*-Measuring instruments don’t belong to children hands-
-1-

2. Introduction of PeakTech
®
4065 Function/Arbitrary Waveform Generator
With Direct Digital Synthesis (DDS) technology, the PeakTech
®
4065 Function/Arbitrary Waveform
Generator is of the high performance indexes and rich function characteristics which are necessary for the
fast completion of measuring. The clear and bright VFD fluorescent display interface is convenient for the
users to operate and observe.
The generator has the following advanced specifications and powerful function characteristics:
* Two-channel output: two independent output channels, CHA and CHB, the
characteristics of the two are the same
* Sync output: output sync signal
* Frequency characteristics: frequency accuracy 20 ppm, 6 digits, resolution 1µHz
* Amplitude offset characteristics: amplitude and offset accuracy 1％, 5 digits, resolution 0.1mV
* Unlimited measurement range: without limitation for the whole range, digital setting directly
* Non-intergraded process: up to the stable value immediately when switching, continuous
signal phase and amplitude without deflection
* High waveform accuracy: the output waveform is synthesized by the computation value of
functions with higher waveform accuracy and less distortion
* Square and Ramp: set accurate square duty cycle and Ramp symmetry
* Pulse: set accurate pulse width
* Arbitrary: 11 internal fixed waveforms and 5 user-defined waveforms
* Phase characteristics: set phase difference of CHA and CHB
* Modulation characteristics: output FM, AM, PM, PWM, FSK signal
* Frequency sweeping: be of the function of output linearity or logarithm frequency
sweeping signal, start point and stop point can be set arbitrarily
* Burst characteristics: output burst signal of which the number has been set.
* External trigger: external trigger is available under frequency sweeping, FSK
modulation and burst function.
* Frequency measurement: be of the function of frequency measurement function.
* Computation function: frequency or period, amplitude virtual value or peak-peak value
can be selected.
* Operation mode: keyboard operation, fluorescent display screen, direct digital
setting or continuous adjusting by knobs.
* High reliability: large scale integrated circuit, surface-mount technology, high
reliability and long service life
* Programmable interface: equipped with USB device interface, with which the generator
could be program-control and download waveforms
* Programmable interface: equipped with USB host interface, with which the parameter setting
and user-defined waveforms could be stored to a U disk
3. Chapter 1 Getting started
The front and rear panels, operations and functions of the PeakTech
®
4065 function generator are described
in this chapter so as to help users to master the basic operation as quickly as possible. The main contents of
this chapter are as follows:
3.1. Prepare the generator for use
3.1.1. Check the generator and the accessories
Check the completeness of the generator and its accessories based on the package list. If the packing box is
damaged badly, please keep it till the generator passes the performance test.
-2-

3.1.2. Connect to power supply
Boot the generator only under the following conditions.
Voltage: AC 100 ~ 240 V
Frequency: 45 ~ 65 Hz
Power consumption: < 30 V A
Temperature: 0 ~ 40°C
Humidity: < 80 %
Plug the attaching plug into an AC 100 ~ 240 V outlet with grounding conductor, press the mains switch on
the panel in to turn on the generator. The generator now is initializing itself and obtaining the default
parameters, outputting sine waveform under continuous working state, with frequency and amplitude of the
signal displayed.
Warning!
In order to ensure the security of the operator, use triple- core socket outlet with grounding conductor.
3.2. Front panel
1. Power switch
2. Function keys
3. CHA output
4. CHB output
5. SYNC output
6. Arrow keys
7. Display screen
8. Number keys
9. Adjusting knob
-3-
1. 2. 3. 4. 5. 6.
7. 8. 9.

3.3. Rear panel
1. Modulation in
2. Trig in
3. Count in
4. Fan
5. Power socket
6. USB Device
7. USB Host
3.4 Display introduction
The display screen display two groups of digits, the group on the left with 6 digits shows frequency, period
and attenuation and so on of the signals. And the 5 digits on the right show amplitude, offset, duty cycle and
so on of the signals. There are also letter and letter indicator lights on the display screen, to indicate present
waveform signal, parameter options and also units of parameters.
3.5 Keyboard introduction
There are totally 28 keys on the front panel (see front panel picture), the functions of which respectively are:
【0】【1】【2】【3】【4】【5】
【6】【7】【8】【9】keys: Digits inputting key.
【.】key: Point inputting key.
【-】key: Minus inputting key, press this key to input minus under offset and
waveform edition option. Press this key to enable or disable the key-
tone circularly under other options.
【＜】key: Move the cursor left; delete the input when inputting digits.
【＞】key: Move the cursor right.
【Freq/Period】select frequency and period circularly; disable calibration process when
calibrating.
【Ampl/Offset】keys: select amplitude and offset circularly.
【Width/Duty】key: select pulse width, duty cycle of square or symmetry of Ramp circularly.
【FM】【AM】【PM】【PWM】
【FSK】【Sweep】【Burst】keys: press them to select respectively frequency modulation, amplitude
modulation, phase modulation, pulse width modulation, frequency shift
keying, frequency sweeping and burst functions, press again to return
back to continuous function.
-4-
1. 2. 3. 4. 5.
6. 7.

【Count/Edit】key: press this key to select waveform edition function when CHA output
user-defined waveforms, and select frequency measurement function
under other functions, press again to return back to continuous function.
【Menu】key: key for menu, select different options circularly under different
functions(see below function option list).
【Shift/Local】key: select shift, or press this key to resume keyboard function under
program control state.
【Output】key: open and close output signal circularly.
【Sine】【Square】【Ramp】
【Pulse】keys: shift keys, select respectively sinewave, square, Ramp and pulse four
common waveforms fast.
【Waveform】key: shift key, select respectively 16 kinds of waveforms with the waveform
sequence numbers.
【CHA/CHB】key: shift key, select CHA and CHB as output channel circularly.
【Trig】key: shift key, manual trigger under frequency sweeping and burst functions
【Cal】key: shift key, select parameter calibration function.
Unit key: The five keys with unit characters above them on the left bottom of the
instrument are not shift keys, but double-function keys, press these
keys directly to execute the functions marked on themselves; when
inputting digits with numeric keys, press these five keys to select the
unit of the inputting and end the digits inputting at the same time.
Options list of menu
Menu Option
CHA continuous Amplitude attenuation, output mode, state and waveform storage, state recall
CHB continuous Amplitude attenuation, output mode, AB phase difference, version number
FM Frequency deviation, modulation frequency, modulation waveform, modulation
source
AM Modulation amplitude depth, modulation frequency, modulation waveform,
modulation source
PM Phase deviation, modulation frequency, modulation waveform, modulation
source
PWM Pulse width deviation, modulation frequency, modulation waveform, modulation
source
FSK Hop frequency, hop rate, trigger source
Frequency sweeping Start frequency, end frequency, sweep time, sweep mode, trigger source
Burst Repeated period, pulse count, start phase, trigger source
Waveform edition Edition point number, horizontal phase, vertical voltage
Frequency measurement Gate time
Calibration Calibration value: zero, offset, amplitude, frequency, flatness
3.6. Basic operation
Below are some samples to describe the basic operation of the generator, for more complex usage and
problems, please refer to the details in chapter 3.
-5-

3.6.1. CHA continuous function
* CHA continuous function: CHA outputs stable and continuous signal with continuous.
Press【Shift】【CHA/CHB】key, select “CHA” option, and set CHA parameters.
* Frequency setting: set frequency value as 3.5kHz
Press【Freq】key and select “Hz” unit, press【3】【.】【5】【kHz】.
* Frequency adjusting: Press【＜】or【＞】key to move the cursor, switch the adjusting knob left or right
to decrease or increase the digit on the cursor position, borrowing from or carrying to the former digit
continuously. Move the cursor left to do rough adjusting, and right to do fine adjusting. The adjusting knob
is applicable for adjusting digits of other options too, which will not be described any more.
* Period setting: set the period as 2.5ms
Press【Period】key and select “s” unit, press【2】【.】【5】【ms】.
* Amplitude setting: set amplitude value as 1.5Vpp
Press【Ampl】key and select “Vpp” unit, press【1】【.】【5】【Vpp】.
* Attenuation setting: set attenuation as 0dB
Press【Menu】key and select “Atten” option, press【0】【dB】.
* Offset setting: set DC offset as -1Vdc
Press【Offset】key and select “V DC” unit, press【-】【1】【V DC】.
* Common waveform selection: select square
Press【Shift】【Square】.
* Duty cycle setting: set square duty cycle as 20％
Press【Duty】key, press【2】【0】【％】.
* Other waveform selection: select exponent waveform sequence number 5, see waveform sequence
number table)
Press【Shift】【Waveform】key, press【5】【#】.
* Output mode selection: the phase of output signal is the opposite of the one of sync signal
Press【Menu】key, select “Mode” option and press 【1】【#】.
3.6.2. CHB continuous
* CHB continuous: CHB outputs stable and continuous signal with continuous.
Press【Shift】【CHA/CHB】key, select “CHB” option and set CHB parameters.
* AB phase difference setting: set the phase difference of CHA and CHB as 90°
Press【Menu】key, select “Phase” option and press【9】【0】【°】.
* Other parameter setting of CHB is the same as the one of CHA.
3.6.3. Frequency modulation function
* Frequency modulation function: set the CHA continuous as 20 kHz first.
Press【FM】key to output frequency modulation signal.
* Modulation frequency setting: set modulation frequency as 10Hz
Press【Menu】key, select “Mod_f” option and press【1】【0】【Hz】.
* Frequency deviation setting: set frequency deviation as 2kHz
Press【Menu】key, select “Devia” option and press 【2】【kHz】.
* Modulation waveform setting: set the modulation waveform as Ramp
Press【Menu】key, select “Shape” option and press【2】【#】.
* Modulation source setting: set external modulation source
Press【Menu】key, select “Source” option and press【1】【#】.
* Return back to continuous function: Under frequency modulation, press 【FM】key to return back to
continuous function.
-6-

3.6.4. Amplitude modulation function
* Press【AM】key to output amplitude modulation signal.
* Modulation frequency setting: set modulation frequency as 1 kHz
* Press【Menu】key, select “Mod_f” option and press【1】【kHz】.
* Modulation amplitude depth setting: set modulation amplitude depth as 50％
* Press【Menu】key, select “Depth” option and press【5】【0】【％】.
* Modulation waveform setting: set modulation waveform as sinewave
* Press【Menu】key, select “Shape” option and press【0】【#】.
* Modulation source setting: set internal modulation source
* Press【Menu】key, select “Source” option and press【0】【#】.
* Return back to continuous function: Under amplitude modulation, press【AM】key to return back to
continuous function.
3.6.5. Phase modulation function
* Phase modulation function: Press【PM】key to output phase modulation signal.
* Modulation frequency setting: set modulation frequency as 10 kHz
Press【Menu】key, select “Mod_f” option and press【1】【0】【kHz】.
* Phase deviation setting: set phase deviation as 180°
Press【Menu】key, select “Devia” option and press【1】【8】【0】【°】.
* Modulation waveform setting: set modulation waveform as square
Press【Menu】key, select “Shape” option and press【1】【#】.
* Modulation source setting: set external modulation source
Press【Menu】key, select “Source” option and press【1】【#】.
* Return back to continuous function: Under phase modulation, press 【PM 】key to return back to
continuous function.
3.6.6. Pulse width modulation function
* width modulation function: Press【PWM】key to output pulse width modulation signal.
* Modulation frequency setting: set modulation frequency as 1Hz
Press【Menu】key, select “Mod_f” option and press【1】【Hz】.
* Pulse width deviation setting: set pulse width deviation as 80 %
Press【Menu】key, select “Devia” option and press【8】【0】【%】.
* Modulation waveform setting: set modulation waveform as sinewave
Press【Menu】key, select “Shape” option and press【0】【#】.
* Modulation source setting: set internal modulation source
Press【Menu】key, select “Source” option and press【0】【#】.
* Return back to continuous function: Under pulse width modulation, press【PWM】key to return back to
continuous function.
3.6.7. Frequency shift keying function
* Frequency shift keying function: set waveform as sinewave
Press【FSK】key to output frequency shift keying signal.
* Hop rate setting: set hop rate as 1 kHz
Press【Menu】key, select “Rate” option and press【1】【kHz】.
* Hop frequency setting: set hop frequency as 2 kHz
Press【Menu】key, select “Hop_f” option and press【2】【kHz】.
* Trigger source setting: set internal trigger source
Press【Menu】key, select “Source” option and press【0】【#】.
* Return back to continuous function: Under frequency shift keying function, press【FSK】key to return
back to continuous function.
-7-

3.6.8. Frequency sweeping function
* Frequency sweeping function: Press【Sweep】key to output frequency sweeping signal.
* Start frequency setting: set the start frequency as 5 kHz
Press【Menu】key, select “Start” frequency and press【5】【kHz】.
* End frequency setting: set end frequency as 20 Hz
Press【Menu】key, select “Stop” and press【2】【0】【Hz】.
* Sweeping time setting: set sweeping time as 5 s
Press【Menu】key, select “Time” option and press【5】【s】.
* Sweeping mode setting: set logarithm sweeping mode
Press【Menu】key, select “Mode” option and press【1】【#】.
* Trigger source setting: set external trigger source
Press【Menu】key, select “Source” option and press【1】【#】.
* Single trigger setting: trigger sweeping once
Press【Shift】【Trig】keys to trigger sweeping once.
* Return back to continuous function: Under frequency sweeping, press【Sweep】key to return back to
continuous function.
3.6.9. Burst function
* Burst function: set continuous as 1 kHz
Press【Burst】key to output burst signal.
* Repeated period setting: set repeated period as 5ms
Press【Menu】key, select “Period” option and press【5】【ms】.
* Pulse count setting: set pulse count as 1
Press【Menu】key, select “Ncyc” option and press【1】【#】.
* Start phase setting: set start phase as 180°
Press【Menu】key, select “Phase” option and press【1】【8】【0】【°】.
* Trigger source setting: set internal trigger source
Press【Menu】key, select “Source” option and press【0】【#】.
* Return back to continuous function: Under burst function, press【Burst】to return back to continuous
function.
-8-

4. Chapter 2 Principle introduction
This chapter describes the basic concept of signal shaping and internal operation of the generator, to help
users to learn more about the performance and specifications then operate the generator more smoothly.
4.1. Principle diagram of generator
4.2. DDS working principle
To generate a voltage signal, traditional analog function generator adopt electronic components to consist
oscillator by many different means, the signals generated are of poor frequency accuracy and stability, low
resolution, inconvenient to set frequency and programmed with computer, but request complex techniques.
Direct Digital Synthesis (DDS) technology is an up-to-date technique to generates signals, it need no
oscillator but digital synthesis technique to generate series of data-current which convert to analog signals
through digital-analog converter.
To generate a sine signal, for example, the function of Y＝SinX should be digitally quantized first, and then
taking x as the address and y as the quantized data to store them into waveform memorizer. DDS uses
phase adding technique to control the address of waveform memorizer. Add a phase increment on the
present result of phase accumulator in each sampling clock period so as to change the output frequency
value by change phase increment. According to the address from the phase accumulator, take the quantized
data out from the wave memorizer and then convert it into analog voltage via digit-analog converter and
operation amplifier. Since the waveform data are discontinuous sampling, stair sine waveform is output from
DDS generator. The included high-level harmonic wave should be filtered by lowpass filter so to output a
continuous sine wave. With high accurate reference voltage source in digit-analog converter, the output
waveform is of high amplitude accuracy and stability.
-9-
Micro-
controller
MCU
Digital
synthesis
FPGA
Digital-analog
converter D/A
Amplitude
control
Offset
control
Clock 20 MHz
Keyboard,
display,
adjusting knob
Voltage
amplification
Power
amplification
Attenuator
20dB+40dB
SYNC output
Output port
Output
protection
Lowpass filter
Data storage
FLASH
Programmable
interface
USB
Power