The GFG-8200A provides an output frequency of 5/3MHz. All models come with standard features such as TTL/CMOS/RAMP output, external voltage controlled frequency (VCF), and built-in 6-digit frequency counter (except for GFG-8215A). At the same time, (GFG-8217A/8219A/8255A) has added linear and logarithmic scanning, and (GFG-8219A/8255A) has added GCV output and AM/FM modulation functions. The complete functions and user-friendly interface of GFG-8200A are fully suitable for audio response testing, vibration testing, servo system evaluation, and ultrasonic applications.