Walfront UDB1002 User manual

UDB100x(S) seriers
Direct Digital Synthesis (DDS)
Signal Generator
Users Manual
Rev2.1
2011-3-10
Introduction of the instrument

UDB100x(UDB100xS) series direct digital synthesis signal generator use DDS technology
and FPGA design with the characters of high stability and low distortion ect., with the function of
TTL output and 60MHz frequency meter, UDB100xS series have sweep function, the start and end
frequency and sweep time can be set at will. It’s the ideal equipment of electronic engineer, laboratory,
production lines, the teaching and scientific research.
Main technology data
●Signal Output function
Output waveforms Sine wave, Square wave and Triangle wave
Output amplitude ≥9Vp-p (signal output, no load)（MAX）
About 0.1Vp-p (MIN)
Output impedance 50Ω±10%(signal output)
DC offset ±2.5V(no load)
Display LCD1602
Frequency range 0.01Hz ~ 2MHz(UDB1002)
0.01Hz ~ 3MHz(UDB1003)
0.01Hz ~ 5MHz(UDB1005)
Resolution 0.01Hz(10mHz)
Frequency Stability ±1×10－6
Frequency accuracy ±5×10－6
Sine wave distortion ≤0.8% (reference frequency is 1kHz)
Trinagle linearity ≥98% (0.01Hz~10kHz)
Rise and fall time of square wave ≤100ns
Square Wave Duty range 1%~99%(digital control mode)
●TTL Output function
Frequency range 0.01Hz ~ 2MHz(UDB1002 or UDB1002S)
0.01Hz ~ 3MHz(UDB1003 or UDB1003S)
0.01Hz ~ 5MHz(UDB1005 or UDB1005S)
Amplitude >3Vp-p
Fan Out >20 TTL loads
●COUNTER function
Counter Range 0-4294967295
Frequency Meter Range 1Hz~60MHz
Input Voltage Range 0.5Vp-p~20Vp-p
●SWEEP function (as for UDB100xS series)
Frequency range fM1 to fM2
Sweep time 1s~99s
●Others function
Save and Load Parameter M0-M9(M0: default load)
The function introduction of front panel

Operating Guide
1. Pressing the “select” button which can switch from frequency adjusting
to function adjusting, and the detailed condition (frequency adjusting or
function adjusting) displayed after “*”.
2. As frequency adjusting, pressing the button of “left” and “right” can adjust
position, and the “OK” button can switch units(Hz，kHz and MHz) and then
adjust the code switch and the corresponding value of frequency appear.
step frequency：0.01kHz
step frequency：100kHz etc.
The frequency unit is ‘Hz’
The frequency unit is ‘MHz’

3. As function adjusting, pressing the button of “left” and “right” can
switch “WAVE，“DUTY”， “COUNTER”， “EXT.FREQ”，
“SAVE” , “LOAD”, “TIME” and “SWEEP”.
4. As WAVE adjusting, pressing “OK” which can change waves of SIN, TRI
and SQR.
main output waveform is sine.
main output waveform is square.
main output waveform is triangle.
5. The “DUTY” means duty cycle, SQR adjusted from 1% to 99%, while TRI
adjusted from 50%(standard TRI), above 50% to below 50% (both are
different sawtooth waves, SIN is disable).
: (WAVE=SQR)
: (WAVE=SQR)
: (WAVE=TRI)
: (WAVE=TRI)
: (WAVE=TRI)
6. COUNTER is counter function, and the counter values displayed on the
screen, impulse inputted from ExtInput, reset to “0”as “OK” pressed and
counting again.
7. EXT.FREQ is exterior frequency measuring function, which can measure the
frequency of input signal.

8. SAVE can save the value of the current frequency, wave and duty, and there
are 10 storage position from M0 to M9, which adjusted by code switch,
as setting finished, then press “OK” button, when “OK” appeared on the
screen, storage is over. If the current value is saved to “M0”, and the changed
value will be called in next time, to UDB100xS series, the start frequency of
sweep function is defined at M1, the end frequency is defined at M2. If the
sweep function need to be run, the start and end frequency must to be set
correctly, and fM2>fM1.
（set posion）
(Save to “0 position” is OK)
9. LOAD is function of calling in the parameters of memory, operation is
similar to SAVE.
10. TIME is the function of set sweep time from 1 second to 99 seconds.
11. SWEEP is the function of sweep, the default setting is stop, it can be run as
pressing the button of OK，the sweep time and frequency range (fM1 to fM2)
need to be set in advance.
12. TTL output the synchronized TTL wave of the same frequency
13.The two right potentiometers adjust output amplitude and DC offset
respectively.
Appendix
complete set of instrument and auxiliary
DDS function generator / counter----------------1
DC 5V Power Supply------------------------------1
User’s manual---------------------------------------1