VOLTEQ SFG1002 Manuel utilisateur
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This instrument is a signal generator with features such as highly stable, broadband and
multi-function .The design of appearance is strong and elegant. And it is easy to operate, could
directly generated sine wave, triangle wave, square wave, ramp, pulse, and has VCF input control
functions. TTL / CMOS can be as synchronized output with the OUTPUT. The adjusted Waveform is
symmetry and have reverse output, DC level can be adjusted continuously. Frequency meter could be
as the display of internal frequency and measure the outside frequency. It is particularly suitable for
teachings, scientific researching and experimenting of electronic and pulse circuits.
ⅠMain technical Features
1. Frequency range: 0.1Hz-2MHz (SFG1002)
0.1Hz-5MHz (SFG1005)
0.1Hz-10MHz (SFG1010)
0.1Hz-15MHz (SFG1015)
2. Waveform: sine wave, triangle wave, square wave, Positive and Negative sawtooth and Positive
and Negative pulse
3. Square-wave front: SFG1002<100ns
SFG1005<50ns
SFG1010<35ns
SFG1015<35ns
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4. Sine wave
Distortion :< 1% (10Hz-100KHz)
Frequency response: 0.1Hz-100 KHz ≤±0.5dB
100 KHz-5MHz ≤±1dB (SFG1005)
100 KHz-2MHz ≤±1dB (SFG1002)
5. TTL / CMOS output
Level:TTL Pulse low level is no more than 0.4V, high level is no less than 3.5V.
Rising time: no more than 100ns
6. Output: Impedance:50Ω±10%
Amplitude: no less than 20vp-p （Empty load）
Attenuation：20dB 40dB
DC bias 0-±10V (Continuously adjustable)
7. Adjustment range of symmetry: 90:10-10:90
8. VCF input
Input voltage:-5V-0V±10%
The maximum voltage ratio: 1000:1
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Input signal: DC-1KHz
9. Frequency meter
Measuring range: 1Hz-20MHz
Input Impedance: no less than 1 MΩ/20pF
Sensitivity: 100mVrms
The maximum input: 150V (AC+DC) with attenuator
Input attenuation: 20dB
Measurement error: ≤0.003%±1digit
10. The scope of adaptation of power
Voltage: 220V±10 %( 110V±10%)
Frequency: 50Hz±2Hz
Power: 10W (Optional)
11. Environmental conditions
Temperature: 00C -400C
Humidity: ≤RH90% Atmospheric pressure: 86kPa-104kPa
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12. Dimension (L ×W×H):310×230×90mm
13. Weight :About2-3Kg
ⅡPrinciple
The Block diagram of the apparatus is shown as Figure 1
Figure 1
50Ω
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1．Constant current source control circuit,
This part of the circuit is shown as Figure 2, positive Vbe of transistor is offset due to the
closed-loop of integrated circuits，if it is ignored as block offset voltage IUP=IDOWN=VC/R
2. Square-wave generator,
This is a constant current source controlled with triangular wave - square-wave generator, in
Figure 3. Diode consisted circuit control capacitor C charging and discharging, using high-speed
comparator to control the on and off of the diode switches (V105-V111). When the comparator B
is high, V107 and V109 conduct，V105 and V111 cut-off, constant current source doing positive
charge to integral capacitance C, when the comparator B is low, V105 and V111 conduct，V107
and V109 cut-off, constant current source doing positive discharge to integral capacitance C .So
as the cycle, the output of a point is the triangle wave, the output of B points is the square wave.
While wave, square wave change, you could also change the integral capacitance to change the
frequency of equipment.
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(Figure 2)
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(Figure 3)
3. PA (Power Amplifiers)
In order to guarantee a very high slew rate and good stability, power amplifier circuit used as the
dual-channel, the entire amplifier circuit has the inverted phase features.
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(Figure4)
4．Digital frequency meter
The circuit is made up of broadband amplifier, square-wave shaper, microcontroller, LED
display, etc. When the frequency is working at the “External measurement" state, the external signal
was sent to counter to count after amplifying and regulation, finally displayed on the LED digital tube.
While internal measurement, the signal entered into the counter directly, counting the time of gates,
LED tube decimal point location and Hz or KHz are determined by the CPU
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(Figure5)
5．Power
This instrument use three groups of±23，±17，±5 powers。The ±17 is the main regulation power
supply; ±5 is obtained by three-regulator integrated circuits 7805 for the use of frequency, ±23 used
as power amplifier.
Ⅲ Structural Features
The instrument adopts the all-metal chassis with solid structure, pasted plastic panels, new
beautiful appearance。And it is small with light weight, the majority components（Including the key
switch）of the circuit are installed on a printed circuit board。All the adjustment components are
Ce manuel convient aux modèles suivants
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