A. SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product: A WARNING. Warning statements identify condition or practices that could result in injury or loss of life, A CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property. The following symbols may appear in this manual or on the product: A © ¢t ATTENTION Protective Earth refer to Manual Conductor {Ground) Terminal Terminal B.
C. CLEANING Remove the AC input power (disconnect and remove the power cord) and test lead from the instrument before attempting to clean the instrument. To keep the instrument clean, wipe the case with a damp cloth and detergent. Do not use chemicals containing benzine, benzene, toluene, xylene, acetone, abrasives or similar solvents D. FOR UNITED KINGDOM ONLY .
1. FEATURES Low sine wave distortion,high stability, shorter warm-up time and less power consumption. High reliability with adoption of direct coupled circuits throughout the entire stage. Compact styling with vertical type panel for easy operation. Frequency dial scale calibrated with single-scale graduations for frequency range from 10Hz to MHz delectable in 5 ranges. High output design; more then 5V rms at 600 QO (Sine Wave).
2.8 Environmental: o Indoor use Altitude up to 2000m o Installation category 11 . Pollution degree 2 ® Within specification temperature/humidity range: Operation temperature/humidity range: Power requirement: 100/120/220/230VAC % 250VAC), 50-60Hz 2.10 Power consumption: 8watts/IOVA 2.11 Dimensions: o Casing: 200(W)x 340(D)X 270(H) mm ® Overall(include knobs): 130(W) X 295(D)x 210(H) mm ® External view: See Fig 2 2.12 Weight: 3kg 2.
3.CIRCUIT DESCRIPTION 3.1 Summary ‘When reading the following descriptions, refer to the block diagram (Fig.1). The sine-wave signal generated by the Wren bridge oscillator circuit is fed through the WAVE FORM selector switch set at the "~ position to the AMPLITUDE control, by means of which it is adjusted to any desired voltage. If the WAVE FORM switch is in the "_L" position, the sine-wave signal is shaped into the square wave and the voltage is also adjusted by the AMPLITUDE control.
These elements provide means to vary the oscillating frequency continuously over 10 times its frequency on one range, thus determining any desired frequency within the entire frequency range from 10Hz to MHz. The amplifier circuit for the oscillator circuit is composed of a compound differential amplifier and an output stage.
3.5 Output Attenuate The 6-position output attenuation selects attenuation of 0dB to -50dB in 10dB steps. At the 0dB position with the AMPLITUDE control muted fully clockwise, the output voltage (sine wave at a 600 () load) is more than 5V rms. load. 3.6 Power Supply The output impedance is rated for 600 ' and the attenuation accuracy visas == 1.
4 PANEL CONTROLS AND THEIR FUNCTIONS The table below describes the functions of panel controls. Refer to the panel diagram (Fig.2). ® FRONT PANEL 1. This lamp (light emitting diode) lights when POWER switch is ON. 2. POWER SWITCH: This switch applies or removes AC power. 3. ATTENUATION: 6-position output attenuation selects attenuation of 0dB to -50dB in 104B » steps. 4. OUTPUT TERMINAL: Output terminal used for both sine wave and square wave. The Black terminal indicates GND (Case grounded) 5.
7. AMPLITUDE: Amplitude adjuster to continuously vary the amplitude of output voltage. 8. FREQUENCY DIAL: This dial adjusts oscillating frequencies. Frequencies can be read by multiplying the reading on the dial scale by magnification of FREQ. RANGE. . 9. DIAL SCALE: This pointer indicates frequencies on the dial scale. ® REAR PANEL + 10. EXT SYNC: External synchronizing signal input terminals for GND for connection of synchronizing signal to the instrument. 11. FUSE HOLDER: Fuse for power supply. 12.
EXASPERATING INSTRUCTIONS 1. Start-up First check that the fuse (11), then connect the supplied AC power cord to your AC outlet. Press the power switch (2) and the pilot lamp (1) will light indicating that the unit is ready for operation, Allow 2 or 3 minutes for the unit to warm up so that it is stabilized. 2. Waveform Selection Press the WAVE FORM switch (5) to position to obtain sine waves. Press the switch to the for square waves. 3. Frequency Selection First set the FREQ.
4. Adjustment of Output Voltage The output voltage from OUTPUT terminal (4), sine wave or square wave, can be continuously F varied by AMPLITUDE (7) and stepped down by ATTENUATION (3), ( Example: To adjust output voltage to 10mV rms, proceed as follows: 1.Connect a voltmeter capable of measuring AC 1V rms to OUTPUT terminal ATTENUATION (3) to 0dB and then adjust AMPLITUDE (7) until the voltmeter indicates 1V mms. A voltage of 1V rms will appear at OUTPUT terminal (4). 2.Set ATTENUATION (3) to -40dB.
Note: that too high a synchronizing signal voltage will affect the amplitude and distortion factor, and care must therefore be taken when the signal voltage is higher than 3V rms. Also, note that if the synchronizing signal is largely deviated from the frequency of instrument the synchronization is pulled out which affects the distortion factor. It is therefore advisable that the oscillating frequency be first synchronized with a low input signal voltage (less than 1V rms) and then the voltage be increased.
6. APPLICATIONS 1. Using as Sine Wave Oscillator: The instrument can be used as a sine wave oscillator as outlined below. 1.1 Since the unit features low distortion factor, it can be used for measurement of distortion characteristic of amplifier. 1.2 Since the unit features wide bandwidth, it can be used for measurement of frequency characteristic of amplifier. 1.3 The built-in high accuracy attenuation permits measurement of amplifier gain. 1.4 Can be used as a signal source of impedance bridge. 2.
I — 2.2 Disconnect the amplifier and connect the AC volt-meter to instrument to measure the output voltage. Note: that the use of ATTENUATION (3) eliminates the need for connecting a high sensitivity voltmeter, E ATTENUATION (3) is set to 0dB and the volt-meter indicates 2V, it means that the input voltage of the amplifier is 50dB below 2V.
3. Measurement of Phase Characteristic Connect the instrument and an oscilloscope to the amplifier to be tested as shown in Fig.5. If there is no phase shift about the output signal of the amplifier, the oscilloscope will display a straight line as shown in Figaro. 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.
GOV 135° 1800 (B) 315° 270° 225° L x Fig.6 Check of Phase Shift Angle 4. Using as Square Wave Oscillator The instrument features excellent rising and falling characteristics (120 s as standard characteristic). It has no coupling capacitors in the output stage, so the sag (deflection of top section) is as low 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.
OSCILLOSCOPE AUDIO GRATEFUL amn Fig.7 Output waveform Amplifier characteristic Flat frequency characteristic over 10 times the input frequency Frequency of about 10 times the input frequency is cut off. Frequency of about 1/10 of the input frequency is cut off ZINE U Peak appears on frequency of about 10 times the put frequency. Fig.
7. ADJUSTMENT AND CALIBRATION 1. Oscillating Voltage Adjustment 1.1 Set the instrument frequency to kHz. Connect an oscilloscope to TP202. 1.2 Adjust VR201 to obtain a symmetric sine wave on the oscilloscope. 1.3 Adjust VR203 until the sine wave amplitude is 11V p-p. 1.4 Set the instrument frequency to MHz. Adjust VC202 until the sine wave amplitude is 12V p-p. 2. Frequency Adjustment 2.1 Connect a frequency counter to the OUTPUT terminal. 2.2 Set the FREQ.
4. Distortion Adjustment 4.1 Connect 8 distortion meter to the OUTPUT terminal. 4.2 Set the FREQ. RANGE switch to X 100 and the frequency dial to "10" position. 4.3 Adjust VR202 to obtain a minimum distortion.
8.CAUTION L. Do not apply voltage of more than 10V rms to OUTPUT terminal and SYNC terminal. If a DC voltage is to be used, it should be applied through a capacitor. 2. Connecting leads should be as short as possible. Use of a long shield cable will affect high frequency amplitude characteristics because of its own line capacitance. Also, use of a long shielded lead will introduce noise and cause other troubles. 3.
sure to press only one FREQ. RANGE switch, If two switches are pressed at the same time or all the switches are in released positions, your instrument will not work properly. 7. Impedance matching: Any related equipment to be connected to OUTPUT terminal should be checked to see that its input impedance matches the output impedance (600 ) of instrument. 8. Effect of external noise: Excessive noise from an outside source may affect the external synchronizing input terminal.
Declaration of Conformity We GOOD WILL INSTRUMENT CO., LTD. Rd, Chengdu City, Taipei County, Taiwan. GOOD WILL INSTRUMENT (SUZHOU) CO., LTD. +No. 69 Lush an Road, Suzhou New District Jiangsu, China.