Motech FG 700S Series Operating Manual
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Motech FG 700S Series Operating Manual

Motech FG 700S Series Operating Manual

Direct digital synthesis function generator
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FG 700S/F Series
Direct Digital Synthesis
Function Generator
Operating Manual

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Summary of Contents for Motech FG 700S Series

  • Page 1 FG 700S/F Series Direct Digital Synthesis Function Generator Operating Manual...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION SAFETY CONSIDRATIONS The Model FG700S/F series Direct Digital Synthesis Function Generator has been designed and tested according to EN61010-1:2001 and EN61326:1997. SAFETY PRECAUTIONS SAFETY NOTES The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument.

  • Page 4: Warranty Information

    If any defect is discovered within the warranty period, MOTECH will repair or replace the unit, subject to verification of the defect or malfunction, upon delivery or prepaid shipment to MOTECH.

  • Page 5: Table Of Contents

    Table of Content Introduction ........................... 1 General ..........................1 Key Features ........................1 Physical Description ......................1 Specification ........................3 Operation............................7 Keypad and Knob Description.................... 7 Opening Screen ........................8 Setting Group Name......................9 Adjust Frequency ....................... 9 Select Waveform ........................ 9 Frequency Sweep ......................

  • Page 7: Introduction

    1. Introduction General The Motech Model FG 700S/F series is a high-performance direct digital synthesize (DDS) function generator with very low noise and distortion. Combined with the DDS technology, the FG 700S/F series can output high accuracy and stable frequency to meet your test requirement of precision and accuracy.
  • Page 8 FG 700F Series Front Panel Rear Panel Liquid Crystal Display Keypad Square Wave Pulse Width Adjustment On/Off Indicator Output Offset On/Off Indicator Output Amplitude Attenuation Range Indicator External/Internal indicator of Trigger/Gate or PSK/FSK Rotary with Push Button Handle Function Output BNC Connector (50 output impedance)

  • Page 9: Specification

    External input BNC Connector for Trigger/Gate and PSK/FSK (CMOS level) Amplitude Adjustment Knob DC/Offset Adjustment Knob Square Wave Pulse Width Adjustment Knob Sync Output Connector (TTL level with 50 output impedance) Power Switch Adjustable Feet Air Ventilation Holes Power-line Fuse Holder Power-line AC Input Socket Chassis Terminal Protective Earth (Ground) Terminal...
  • Page 10 Sync Output : Frequency range : 100mHz ~ 8MHz Output level : low level 0.6V @ 50 high level 1V @ 50 Output impedance : 50 Modulation Characteristics : Function : Sine, Square or Triangle Frequency range : 100mHz ~ 8MHz Internal rate : 400Hz / 1000Hz Source...
  • Page 11 DC Offset and DC Output : ±10V at open-circuit, ±5V at 50 load DC Output Resolution 10mV@±9.99V ,1mV@±99mV ,0.1mV@±9.9mV ,0.01mV@± 0.99mV (Depend on Attenuation) k. DC Output Accuracy : 1% ± 5 counts (Amplitude Knob at Maximum Position) Sine Wave Harmonic Distortion : DC ~ 100KHz < -55dBc typical 100KHz ~ 1MHz <...
  • Page 12 Main frequency setting : 100mHz ~ 10M/20MHz Frequency Counter Range : 4Hz to 100MHz Accuracy : ±5 counts Resolution : 7 digits or (99.9999) d. Low pass filter : Manual Timebase accuracy : 50MHz±25ppm(23.5±5˚C)Optional TCXO Time Base Available Input Attenuation : 0db,-20db g.

  • Page 13: Operation

    2. Operation Keypad and Knob Description Key and knob Function Right Key (FG700S/F Series) a. Change to the next selection. b. In frequency editing, the frequency will x10 if the cursor is off. c. In frequency editing, the cursor goes to right position if the cursor is on. Function Key (FG700S Series) a.

  • Page 14: Opening Screen

    Rotary with Push button (FG700S/F Series) a. Change to the next selection when turning clockwise. b. Change to the previous selection when turning counterclockwise. c. In frequency editing, turn clockwise to increase the frequency setting. d. In frequency editing, turn counterclockwise to decrease the frequency setting. e.

  • Page 15: Setting Group Name

    Warning " Please make sure that the correct power rating feeds to the function generator. If the higher voltage (230V) feeds to 115V version of function generator, the chance of damage the function generator may happen and the fuse will blow. Please use the following rating of fuse for replacement. 115V version function generator : 0.5A/250V fuse (slow blow) 230V version function generator :...

  • Page 16: Frequency Sweep

    b. In FG708F series, press the key to select output waveform. There are six waveforms to be selected (sine, square, triangle, ramp up, ramp down and DC). F R Q : 1 . 0 0 0 0 K H z A M P : 1 .
  • Page 17 L I N : 4 . 0 0 0 2 K H z S W E E P L I N S W 1 Linear Frequency Sweep L O G : 4 . 0 0 0 2 K H z S W E E P L O G S W 1...
  • Page 18 L I N : 1 0 . 0 0 0 0 K H z S w e S t e p S e t S W 5 Linear Sweep Step Frequency Setting L O G : 1 0 . 0 S w e S t e p S e t S W 6 Logarithm Sweep Step Ratio Setting...

  • Page 19: Output Attenuation

    waveform. L I N : 4 . 0 0 0 0 2 M H z A M P : 1 . 0 0 V S I N Linear Sweep L O G : 4 . 0 0 0 0 2 M H z A M P : 1 .

  • Page 20: Amplitude, Offset And Square Wave Pulse Width Display

    to select the default or manual frequency step of rotary up/down key or adjustment. F R Q : 1 . 0 0 0 0 K H z F S t e p D e f a A T 2 Default Frequency Step F R S : 1 .
  • Page 21 F R Q : 1 . 0 0 0 0 K H z O F S : . 0 0 m V S I N Offset Display e. To adjust the pulse width in FG700S series, please select the square waveform first and set the pulse width on in sub function menu (SB2).

  • Page 22: Trigger/Gate

    D T Y : 5 0 . 0 5 0 0 . 0 S B 6 Pulse Width Duty Setting 2.10 Trigger/Gate a. Press the key to enter the trigger/gate selection menu. to select external trigger , rotary push trigger , external gate b.
  • Page 23 to select PSK 1KHz , PSK 400Hz , PSK external , FSK 1KHz , b. Use the key or FSK 400Hz and FSK external . The corresponding internal or external indicator will show up. F R Q : 1 . 0 0 0 0 K H z P F M O F F...

  • Page 24: Sub Function

    F R Q : 1 . 0 0 0 0 K H z F s k F r q 1 S e t T M 4 FSK Frequency 1 Setting F R Q : 1 . 0 0 0 0 K H z F s k F r q 0 S e t T M 5...
  • Page 25 F R Q : 1 . 0 0 0 0 K H z P W H P o s S B 2 Square Wave Pulse Width Adjustment On and Output Positive Pulse F R Q : 1 . 0 0 0 0 K H z P W H N e g...
  • Page 26 1 9 . 6 % D u t y Duty Cycle Measurement Note : Use the key measure the duty cycle of the external input signal. F R Q : 1 . 0 0 0 0 K H z S Y N O F F S B 1 Sync Output Off...
  • Page 27 F R Q : 1 . 0 0 0 0 K H z E X T E R N S B 3 AM On, External Source F R Q : 1 . 0 0 0 0 K H z P W H O F F S B 4 Square Wave Pulse Width Adjustment Off...

  • Page 28: Notice Of Operating

    F R Q : 1 . 0 0 0 0 K H z O F F S B 7 FM Off F R Q : 1 . 0 0 0 0 K H z 4 0 0 H z S B 7 FM On, Internal 400Hz Source F R Q : 1 .
  • Page 29 signal / noise ratio. d. For Large Signal Output : • In general, the function generator output is 20Vp-p in open circuit, and the output current is limited to less than 100mA. For high voltage and high current output in special applications, the external power amplifier is needed.
  • Page 30 ZOMG-700ME-1B...

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