目錄:廈門地坤科技有限公司>>儀器儀表>>儀器>> GFG-809110低頻信號發(fā)生器
| 應用領域 | 文體,建材,電子,汽車,綜合 |
|---|
GFG-809110低頻信號發(fā)生器
1.FEATURES
Reliable circuitry insure high stability and accuracy
Easy operation on vertical type panel assembling
Frequency range from 10Hz to 1MHz selectable in 5 ranges are calibrated with single-scale graduations.
More than 5Vrms at no load and more than 2.8Vrms on 600Ω loading (sine wave). Output level can be adjusted by a 10dB-step, 6 range attenuator and a level adjuster.
Sine wave and square waves is available.
Synchronizing input terminal
2.Specifications
Frequency range:
X1 range: 10Hz-100Hz
X10 range: 100Hz-1KHz
X100range: 1KHz-10KHz
X1K range: 10KHZ-100KHz
X10K range: 100KHz-1MHz
Sine wave characteristics
Output volGFG-809110: 5V rms or more
Output distortion: 400Hz-20KHz, 0.1% or less
(X100 range for 1KHz)
50Hz-500KHz 0.5% or less
Output Flatness: ±1.5 dB (refer to 1KHz)
Square wave characteristics:
Output volGFG-809110: 10Vp.p or more
Rise time: 0.25 us or less
Duty ratio: 50%±5% (refer to 1KHz)
External synchronization characteristics
Range±3% of oscillator frequency
Input impedance: 10K approximate
Maxi mun input: 10V rms
Output characteristics:
Impedance: 600Ω±10%
Attenuator: 0dB, -10dB, -20dB, -30dB, -40dB, and -50dB in 6 steps (accuracy +1 dB at 600Ω load)
Power requirement:
Input: AC 110V or 220V, 50/60Hz
Consumption: 5 Watt
Dimension:
142(w)*233(D)*197(H) mm
Weight:3.5Kg
Accessories:
Power cord 1pc
Test clip 1pc
Instruction manual 1pc
3.CIRCUIT DESCRIPTION
1) Summary
When reading the following descriptions, refer to the block diagram(Fig.1) and the schematic diagram.
The sine-wave signal generated by the oscillator is fed through the WAVE FROM selector switch set at the “ 
” position to the OUTPUT control, to adjust on any desired volGFG-809110.
If the WAVE FORM switch is in the “
” position, square wave is fed to the OUTPUT control to adjust on any desired volGFG-809110.
The adjusted signal volGFG-809110 is applied to the output circuit with its impedance converted, and then delivered through an output attenuator to the output terminal.
The attenuator provides selectable attenuations of 0dB through -50dB in 10dB steps at 600Ω of output impedance.
2) Wien Bridge Oscillator Circuit
The Wien bridge oscillator circuit with resistance elements may be switched over for 5 ranges by the FREQ. RANGE switch, and the variable capacitor controlled by the FREQUENCY dial.
These elements provide means to vary the oscillating frequency continuously over 10 times its frequency on one range, so any desired frequency within the entire frequency range from 10Hz to 1MHz can be set.
The buffer circuit for the oscillator circuit is composed of a 2 sGFG-809110 differential amplifier and an output sGFG-809110, employing an DC amplifier circuit.
The output volGFG-809110 is fed back with positive polarity through the oscillator elements to form an oscillating circuit; while it is also fed back with negative polarity through the non-linear thermistor to stabilize the amplitude.低頻信號發(fā)生器GFG-809110
3) Square wave shaping circuit
The square wave shaping circuit is a Schmit-trigger circuit in which the sine wave signal from the oscillator circuit is shaped into a square wave. Schmit-trigger circuit and a buffer amplifier providing sufficient rising and falling characteristics
4) Output circuit
The output circuit converts the impedance of oscillating signal from the OUTPUT control and feeds the signal to the output attenuator at a low impedance. SEPP-OCL circuit is employed to provide sufficient low output impedance characteristics over the range from DC to 1MHz
5) Output Attenuator
The 6-positions output attenuator selects attenuations of 0dB to -50dB in 10dB steps. At the 0dB position with the OUTPUT control turned fully clockwise, the output volGFG-809110 (sine wave at no-load time) is more than 5Vrms.
The output impedance is rated at around 600Ω and the attenuation accuracy is as high as ± 1.0dB at 600Ω load.
6) Power supply
The power supply circuit is powered by AC 110V/220V and delivers DC ± 24V sufficiently stabilized by large capacity smoothing capacitors and a volGFG-809110 stabilizer.
4. PANEL CONTROLS AND THEIR FUNCTIONS
The table below describes the functions of panel controls. Refer to panel diagram on page 4
FRONT PANEL
1. DIAL POINTER
This pointer indicates frequencies on the dial scale
2.DIAL SCALE
This dial is calibrated with graduations of 10-100 to indicate oscillating frequencies
3. FREQUENCY DIAL
This dial adjusts oscillating frequencies. Frequencies can be read by multiplying the reading on the dial scale by magnification of FREQ. RANGE.
4. ATTENUATOR
6-position output attenuator selects attenuations of 0dB to -50dB in 10dB steps.
5. SYNC
External synchronizing signal input terminals for GND for connection of synchronizing signal to the instruments.
6. OUTPUT
Output terminal used for both sine wave and square wave
7. FREQ. RANGE
Oscillating frequency range selector switch which selects the ranges in 5 steps as follows:
X1 10Hz-100Hz
X10 100Hz-1KHz
X100 1KHz-10KHz
X1K 10KHz-100KHz
X10K 100KHz-1MHz
8. WAVE FORM
Output waveform selector switch. When pressed to “
’ output signal is sine wave. When pressed to “
” the signal is square wave.
9. AMPLITUDE
Amplitude adjuster to continuously vary the amplitude of output volGFG-809110
10. POWER Switch turns on the power when pressed
11.VOLGFG-809110 SELECTOR 110V/220V selection
12. AC INPUT TERMINAL
13. FUSE SOCKET
14. This lamp ( light emitting diode) lights when POWER switch (10) is ON.
5. OPERATING INSTRUCIONS
1) Start-up
First check that the fuse (13), then connect the supplied AC power cord to your AC outlet. Press the power switch (10) and the pilot lamp (14) will light indicating that the unit is ready for operation. Allow 3 minutes for the unit to warm up so that it is stabilized.
2)Waveform selection
Press the WAVE FORM switch (8) to “~” position to obtain sine waves. Press the switch to the “
” position for square waves.
3)Frequency selection
First set the FREQ. RANGE switch (7) to the desired range, then set the frequency dial(3) so that the dial pointer(1) indicates your frequency.
Example: suppose you want to select a frequency of 1.5KHz, then proceed as follows:
1. Set FREQ. RANGE switch(7) to X 100.
2. by using the frequency dial, set the dial pointer(1) to “15” on the dial scale.
The frequency thus selected is:
15×00=1500(Hz)=1.5( KHz)
4) Adjustment of output volGFG-809110
The output volGFG-809110 from OUTPUT terminal (6) either sine wave or square wave, can be continuously varied by AMPLITUDE(9) and stepped down by ATTENUATOR (4)
Example: To adjust output volGFG-809110 to 10mV rms, proceed as follows:
1. Connect a voltmeter (e.g. TVT-321) capable of measuring AC 1V rms to OUTPUT terminal (6)
2. Set ATTENUATOR (4) to 0dB and then adjust AMPLITUDE (9) until the voltmeter indicates 1Vrms (6)
3. Set ATTENUATOR (4) to -40dB. The voltmeter indicates about OV, while a volGFG-809110 of 10mVrms appears at OUTPUT terminal (6)
低頻信號發(fā)生器GFG-809110
5) USE of Synchronizing input terminal (instrument is between 990Hz and 1010Hz)
By applying an external sine wave signal to SYNC terminal (5), the oscillating frequency can be synchronized to the external signal. Synchronizing range is increased in proportion as the input volGFG-809110 is increased as shown in Fig.3, indicating that the synchronizing range is about 1% per input volGFG-809110 of 1V.
Example: Suppose that the input signal volGFG-809110 is 1Vrms and the oscillating frequency of GENERATOR is between 990Hz and 1010Hz(1KHz±1KHz×1%/v×1V=1KHz±1KHz×0.01), the frequency can be synchronized with 1KHz of the input signal.
Note that too high synchronizing signal volGFG-809110 will affect the amplitude and distortion factor, and care must therefore be taken when the signal volGFG-809110 is higher than 3Vrms. Also, note that if the synchronizing signal is largely deviated the distortion factor. It is therefore advisable that the oscillating frequency be first synchronized with a low input signal volGFG-809110 (less than 1Vrms) and then the volGFG-809110 be increased.
6. APPLICATIONS
1) Using as sine wave oscillator
As a sine wave oscillator, features can be noted as below.
1.1 Low distortion factor can be obtained for measurement of distortion characteristic of amplifier.
1.2 As the unit working on wide bandwidth, it can be used for measurement of frequency characteristic of amplifier.
1.3 The built-in high accuracy attenuator permits measurement of amplifier gain.
1.4 Can be used as a signal source of impedance bridge.
2)Measurement of amplifier gain
An example of measurement of amplifier gain is described below
First connect the instrument, amplifier to be tested and AC volt-meter as shown in Fig.4
2.1Adjust ATTENUATOR (4) and AMPLITUDE(9) so that AC voltmeter indicates the rated output (supposed to be 1 Vin this example) of the amplifier. To facilitate the measurement, it is advisable to set ATTENUATOR(4) as low as possible. Assume that ATTENUATOR (4) is set -50dB for the rated output.
2.2 Disconnect the amplifier and connect the AC voltmeter to instrument to measure the output volGFG-809110. Note that the use of ATTENUATOR (4) eliminates the need for connecting a high sensitivity voltmeter. If ATTENUATOR(4) is set to 0dB and the voltmeter indicates 2V, it means that the input volGFG-809110 of the amplifier is 50dB below 2V. Therefore, the gain obtained is as follows:
3) Measurements of phase characteristic
Connect the instrument and an oscilloscope to the amplifier to be tested as shown in Fig5. If there is no phase shift about the output signal of the amplifier, the oscilloscope will display a straight line as shown in Fig. 5A. If the straight line on the oscilloscope is curved at its top and bottom sections as shown in Fig.5B, it indicates that the output signal of amplifier is suffering from an amplitude distortion. In this case, reduce the output level of instrument a little to vary the frequency. This causes the straight line on the oscilloscope to expand gradually to turn into an ellipse. By utilizing the configuration of this ellipse. The phase shift can be calculated as follows:
First, measure the maximum horizontal deflection and suppose that this deflection is”X” and that the section at which the ellipse crosses the horizontal axis is “X, as show in Fig.6. And, the phase shift angle θ is given by the following
Find from the table of trigonometric functions and the value obtained gives the angle of phase shift.
4) Using as square wave oscillator
The instrument features excellent rising and falling characteristics (120ns as standard characteristic.) it has no coupling capacitors in the output sGFG-809110, so the sag (deflection of top section) is as low as 5% at 50Hz. By applying such a good square wave to an amplifier input, various characteristics of amplifier can be observed on an oscilloscope. To test an amplifier proceed as follows:
4.1 connect the instrument, an amplifier to be tested and an oscilloscope as shown in Fig7.
4.2 Press WAVE FORM (8) to the “
” position to obtain square waves of appropriate frequency and amplitude.
4.3 During the test, change the frequency as necessary. The relationship between waveforms and amplifier characteristics is shown in Fig.8
GFG-809110低頻信號發(fā)生器
公司已發(fā)展成為一家集研發(fā)、生產(chǎn)、銷售、售后于一體的企業(yè)。公司以“高效服務，誠信創(chuàng)新”為經(jīng)營理念，取得了用戶的*認可。本著“質(zhì)量是生命，服務是根基”的創(chuàng)業(yè)理念，博采眾長，堅持以品質(zhì)為先，以服務取勝！
公司銷售網(wǎng)絡遍布全國，為國內(nèi)外企業(yè)用戶提供Zui大化壓縮商品物流環(huán)節(jié)，大大降低用戶采購成本，力爭成為業(yè)內(nèi)工業(yè)品集成供應商。
公司以技術為先導，在得到廣大用戶認可的同時，業(yè)務能力也得到了發(fā)展，積累了豐富的行業(yè)經(jīng)驗力，經(jīng)營規(guī)模不斷擴大，不斷成長為一家綜合性的供應商。
公司團隊口號：我們是細分領域?qū)＜遥√貏e能吃苦！特別能學習！特別能戰(zhàn)斗！
對用戶的鄭重承諾是：莫因事小而不為之，莫因事煩而不愿為之。
隨著公司的不斷成長、壯大，公司將繼續(xù)以服務社會為己任，我們始終本著“質(zhì)量是生命，服務是根基”的創(chuàng)業(yè)理念，堅持以品質(zhì)為先，以服務取勝！
公司擁有專業(yè)的銷售工程師和強大的技術支持，優(yōu)質(zhì)的售后服務隊伍為用戶提供快捷、周到的服務，消除您一切后顧之憂。我們深信，只有站在用戶的立場，為用戶提供更好服務。以支持用戶的業(yè)務和發(fā)展，才能終獲得雙羸！
公司以其化的平臺，打造高效能供應鏈體系，配套大型空港倉儲物流中心，為用戶提供強有力的供貨保障。
“下道工序的要求是對上道工序的命令”，用戶是我們終的下道工序，所以滿足用戶的需求 “有求必應” 是一切工作的出發(fā)點和核心。
“科技為本、*yi、用戶至上、合作共贏”是公司一貫的宗旨。公司將嚴守承諾，積極進取，進一步加大研發(fā)投入，開發(fā)更好的產(chǎn)品與用戶共享，并謁誠為廣大用戶提供jia的服務。
讓我們一路同行，攜手走向更加美好的明天！
SM-30磁化率儀在地理和地質(zhì)方面用途廣泛，*的靈敏度為10–7SI，小得可放在襯衫口袋里，重量輕，深受擁護喜愛。SM-30是SM-20的升級版，更新穎，更精確。
SM-30特別用在野外地質(zhì)勘探和快速實驗室分析，對巖石或巖心樣品進行分析和分類。能測出順磁性、反磁性、鐵磁性巖石的細微差別并精確地給出磁化率。使用了傳統(tǒng)的傳感器和新的信號處理方法保證儀器處于lǐng先地位。
SM-30的六個測量模式在工作狀態(tài)下可切換。兩個是基本模式，兩個是補償模式，一個是掃描模式，一個是平均模式。
自動調(diào)整測量，非常簡單的三鍵控制，單手可操作，一個用于測量，一個用于貯存，一個用于存檔。其它操作可使用電腦來完成，如給出測點說明，貯存測量數(shù)據(jù)以便進一步處理。鋰電池以及自動關機功能配合，可在不換電池的情況下長期工作。
技術參數(shù)：
靈敏度：10 – 7SIunit s
工作頻率：8KHz
測量時間：每點不長于5秒
數(shù)字顯示：4數(shù)位LCD
控制：3個控制鍵
測量范圍：0.000至999× 1/1000SIunits，自動調(diào)整測量范圍：
內(nèi)存：250個測量數(shù)據(jù)，更大內(nèi)存可依附于電腦
傳感器：空心線圈+8KHz LC振子，直徑50mm。在20mm范圍內(nèi)可獲取90%的信號：
電池：2塊3V鋰電池CR2430（正常工作時間為80小時）
尺寸：100×65×25mm
操作溫度：-20℃ 到 +50℃
9
化工儀器網(wǎng)