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GW Instek GAD 201 G Automatic Distortion Meter
The GW Instek GAD 201 G is a precision automatic distortion meter designed to measure total harmonic distortion (THD) and fundamental frequency components in audio and power systems with exceptional accuracy. Audio engineers, power quality technicians, and equipment manufacturers rely on this instrument to verify signal integrity, diagnose harmonic contamination, and ensure compliance with international distortion standards. This meter solves the critical problem of identifying non-linear distortion sources that can degrade system performance, damage equipment, and violate regulatory requirements in both professional audio and industrial power applications.
Product Overview
The GAD 201 G operates on the principle of harmonic analysis using advanced digital signal processing to decompose complex waveforms into their fundamental and harmonic components. The instrument automatically calculates THD percentage by measuring the ratio of harmonic content to the fundamental frequency, eliminating manual calculations and reducing measurement errors. Its sophisticated filtering architecture and high-resolution analog-to-digital conversion enable detection of distortion levels as low as 0.01%, making it suitable for precision audio measurements where even minor harmonic contamination affects sonic quality. The automatic measurement mode continuously monitors incoming signals and displays real-time THD values, fundamental frequency, and individual harmonic amplitudes up to the 50th harmonic.
This model distinguishes itself through its dual-channel capability, allowing simultaneous measurement of two independent signals for comparative analysis in stereo audio systems or three-phase power monitoring applications. The front-panel interface features an intuitive LCD display with selectable measurement modes including THD-F (referenced to fundamental) and THD-R (referenced to RMS), accommodating different industry standards and measurement requirements. Built-in frequency range from 20 Hz to 100 kHz covers audio band, ultrasonic, and power system frequencies, while the adjustable input attenuation settings accommodate signal levels from millivolts to hundreds of volts without external amplification or attenuation circuits.
Key Specifications
| Specification | Details |
| Product Type | Automatic Distortion Meter |
| Brand | GW Instek |
| Model | GAD 201 G |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| THD Measurement Range | 0.01% to 100% |
| Frequency Range | 20 Hz to 100 kHz |
| Input Impedance | 1 MΩ (switchable) |
| Harmonic Analysis | Up to 50th harmonic with individual amplitude display |
| Measurement Modes | THD-F, THD-R, fundamental frequency, harmonic spectrum |
| Channels | Dual independent channels for simultaneous measurement |
Key Features
- Automatic THD measurement with 0.01% resolution for detecting minute harmonic distortion in precision audio mastering and power quality auditing applications
- Dual-channel simultaneous measurement capability enabling comparative distortion analysis between stereo channels or three-phase power systems without sequential testing
- Harmonic spectrum analyzer displaying individual harmonic amplitudes up to the 50th harmonic, facilitating root-cause identification of specific distortion sources
- Wide frequency range from 20 Hz to 100 kHz accommodating audio, ultrasonic, and power system measurements within a single instrument
- Switchable input impedance and attenuation settings allowing direct connection to microphone-level signals through line-level and speaker-level sources without external conditioning
- Dual measurement standards support with THD-F and THD-R calculations meeting IEC and ANSI measurement conventions for international compliance verification
Applications and Use Cases
- Audio mastering and mixing studios where THD measurement ensures final mixes meet commercial broadcast standards and identify harmonic distortion from analog equipment or digital processing artifacts
- Power quality assessment in industrial facilities to diagnose harmonic pollution from variable frequency drives, switching power supplies, and non-linear loads affecting sensitive equipment operation
- Amplifier and loudspeaker testing during product development and quality control to verify distortion specifications and identify design issues before manufacturing
- Electrical equipment commissioning and preventive maintenance programs measuring THD in distribution transformers and power conditioning systems to predict failure risk
- Acoustic consulting and room tuning applications measuring harmonic content in sound systems to optimize speaker placement and identify resonant modes degrading clarity
- Laboratory calibration and standards verification where the meter's precision enables validation of other test equipment and measurement systems
How to Use
Begin by connecting your signal source to the appropriate input channel using shielded audio cables, selecting the input impedance setting that matches your source impedance (typically 600Ω for line-level audio or 1MΩ for high-impedance sources). Adjust the input attenuation dial to position the fundamental frequency peak near the center of the display scale, avoiding clipping while maintaining adequate signal-to-noise ratio. Press the Measure button to initiate automatic THD calculation; the display will show the THD percentage, fundamental frequency in Hz, and a bar graph of harmonic amplitudes. For dual-channel measurements, repeat the connection and setup process on the second channel to compare distortion characteristics between stereo channels or power phases simultaneously.
For harmonic spectrum analysis, navigate to the harmonic display mode using the front-panel menu to examine individual harmonic amplitudes and identify which specific harmonics dominate the distortion signature. This diagnostic capability helps distinguish between different distortion sources: even-order harmonics typically indicate clipping or asymmetrical nonlinearity, while odd-order harmonics suggest core saturation or transformer effects. Record the fundamental frequency value to verify you are measuring the intended signal, as the meter automatically detects the dominant frequency component. When measuring power system signals, ensure proper grounding and use appropriate input attenuation to accommodate the higher voltage levels typical of industrial applications.
Frequently Asked Questions
What is the difference between THD-F and THD-R measurement modes?
THD-F (Total Harmonic Distortion referenced to Fundamental) expresses harmonic content as a percentage of the fundamental frequency amplitude, providing the measurement standard preferred in audio engineering where the fundamental carries the primary signal information. THD-R (Total Harmonic Distortion referenced to RMS) calculates the ratio of harmonic RMS voltage to total signal RMS voltage, which is the standard used in power quality assessment where the total signal magnitude matters more than individual component relationships. The GAD 201 G supports both standards to accommodate different industry requirements and international measurement protocols.
Can the GAD 201 G measure distortion in three-phase power systems?
Yes, the dual-channel capability allows measurement of two phases simultaneously for comparative analysis, though measuring all three phases requires sequential testing of different phase pairs. For comprehensive three-phase analysis, you can measure phase-to-neutral voltage on two channels while rotating the measurement to the third phase in a subsequent test cycle. The 20 Hz to 100 kHz frequency range easily accommodates the 50 Hz or 60 Hz fundamental frequencies used in power systems, and the harmonic analyzer displays up to the 50th harmonic, capturing all significant power system harmonics typically present.
What input signal levels can the GAD 201 G safely measure?
The meter accommodates signal levels from approximately 10 mV to 300 V depending on the input impedance selection and attenuation settings. The switchable input impedance (typically 600Ω or 1MΩ) and adjustable attenuation dial allow you to optimize the input range for your specific signal level without requiring external amplification or voltage dividers. Always verify that the fundamental frequency peak on the display is positioned near the center of the scale to ensure adequate headroom and prevent clipping distortion that would corrupt the measurement.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy GW Instek GAD 201 G Automatic Distortion Meter Online in India
Purchase the GW Instek GAD 201 G Automatic Distortion Meter online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on GW Instek GAD 201 G Automatic Distortion Meter with fast shipping and expert support.
GW Instek GAD 201 G Automatic Distortion Meter
The GW Instek GAD 201 G is a precision automatic distortion meter designed to measure total harmonic distortion (THD) and fundamental frequency components in audio and power systems with exceptional accuracy. Audio engineers, power quality technicians, and equipment manufacturers rely on this instrument to verify signal integrity, diagnose harmonic contamination, and ensure compliance with international distortion standards. This meter solves the critical problem of identifying non-linear distortion sources that can degrade system performance, damage equipment, and violate regulatory requirements in both professional audio and industrial power applications.
Product Overview
The GAD 201 G operates on the principle of harmonic analysis using advanced digital signal processing to decompose complex waveforms into their fundamental and harmonic components. The instrument automatically calculates THD percentage by measuring the ratio of harmonic content to the fundamental frequency, eliminating manual calculations and reducing measurement errors. Its sophisticated filtering architecture and high-resolution analog-to-digital conversion enable detection of distortion levels as low as 0.01%, making it suitable for precision audio measurements where even minor harmonic contamination affects sonic quality. The automatic measurement mode continuously monitors incoming signals and displays real-time THD values, fundamental frequency, and individual harmonic amplitudes up to the 50th harmonic.
This model distinguishes itself through its dual-channel capability, allowing simultaneous measurement of two independent signals for comparative analysis in stereo audio systems or three-phase power monitoring applications. The front-panel interface features an intuitive LCD display with selectable measurement modes including THD-F (referenced to fundamental) and THD-R (referenced to RMS), accommodating different industry standards and measurement requirements. Built-in frequency range from 20 Hz to 100 kHz covers audio band, ultrasonic, and power system frequencies, while the adjustable input attenuation settings accommodate signal levels from millivolts to hundreds of volts without external amplification or attenuation circuits.
Key Specifications
| Specification | Details |
| Product Type | Automatic Distortion Meter |
| Brand | GW Instek |
| Model | GAD 201 G |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| THD Measurement Range | 0.01% to 100% |
| Frequency Range | 20 Hz to 100 kHz |
| Input Impedance | 1 MΩ (switchable) |
| Harmonic Analysis | Up to 50th harmonic with individual amplitude display |
| Measurement Modes | THD-F, THD-R, fundamental frequency, harmonic spectrum |
| Channels | Dual independent channels for simultaneous measurement |
Key Features
- Automatic THD measurement with 0.01% resolution for detecting minute harmonic distortion in precision audio mastering and power quality auditing applications
- Dual-channel simultaneous measurement capability enabling comparative distortion analysis between stereo channels or three-phase power systems without sequential testing
- Harmonic spectrum analyzer displaying individual harmonic amplitudes up to the 50th harmonic, facilitating root-cause identification of specific distortion sources
- Wide frequency range from 20 Hz to 100 kHz accommodating audio, ultrasonic, and power system measurements within a single instrument
- Switchable input impedance and attenuation settings allowing direct connection to microphone-level signals through line-level and speaker-level sources without external conditioning
- Dual measurement standards support with THD-F and THD-R calculations meeting IEC and ANSI measurement conventions for international compliance verification
Applications and Use Cases
- Audio mastering and mixing studios where THD measurement ensures final mixes meet commercial broadcast standards and identify harmonic distortion from analog equipment or digital processing artifacts
- Power quality assessment in industrial facilities to diagnose harmonic pollution from variable frequency drives, switching power supplies, and non-linear loads affecting sensitive equipment operation
- Amplifier and loudspeaker testing during product development and quality control to verify distortion specifications and identify design issues before manufacturing
- Electrical equipment commissioning and preventive maintenance programs measuring THD in distribution transformers and power conditioning systems to predict failure risk
- Acoustic consulting and room tuning applications measuring harmonic content in sound systems to optimize speaker placement and identify resonant modes degrading clarity
- Laboratory calibration and standards verification where the meter's precision enables validation of other test equipment and measurement systems
How to Use
Begin by connecting your signal source to the appropriate input channel using shielded audio cables, selecting the input impedance setting that matches your source impedance (typically 600Ω for line-level audio or 1MΩ for high-impedance sources). Adjust the input attenuation dial to position the fundamental frequency peak near the center of the display scale, avoiding clipping while maintaining adequate signal-to-noise ratio. Press the Measure button to initiate automatic THD calculation; the display will show the THD percentage, fundamental frequency in Hz, and a bar graph of harmonic amplitudes. For dual-channel measurements, repeat the connection and setup process on the second channel to compare distortion characteristics between stereo channels or power phases simultaneously.
For harmonic spectrum analysis, navigate to the harmonic display mode using the front-panel menu to examine individual harmonic amplitudes and identify which specific harmonics dominate the distortion signature. This diagnostic capability helps distinguish between different distortion sources: even-order harmonics typically indicate clipping or asymmetrical nonlinearity, while odd-order harmonics suggest core saturation or transformer effects. Record the fundamental frequency value to verify you are measuring the intended signal, as the meter automatically detects the dominant frequency component. When measuring power system signals, ensure proper grounding and use appropriate input attenuation to accommodate the higher voltage levels typical of industrial applications.
Frequently Asked Questions
What is the difference between THD-F and THD-R measurement modes?
THD-F (Total Harmonic Distortion referenced to Fundamental) expresses harmonic content as a percentage of the fundamental frequency amplitude, providing the measurement standard preferred in audio engineering where the fundamental carries the primary signal information. THD-R (Total Harmonic Distortion referenced to RMS) calculates the ratio of harmonic RMS voltage to total signal RMS voltage, which is the standard used in power quality assessment where the total signal magnitude matters more than individual component relationships. The GAD 201 G supports both standards to accommodate different industry requirements and international measurement protocols.
Can the GAD 201 G measure distortion in three-phase power systems?
Yes, the dual-channel capability allows measurement of two phases simultaneously for comparative analysis, though measuring all three phases requires sequential testing of different phase pairs. For comprehensive three-phase analysis, you can measure phase-to-neutral voltage on two channels while rotating the measurement to the third phase in a subsequent test cycle. The 20 Hz to 100 kHz frequency range easily accommodates the 50 Hz or 60 Hz fundamental frequencies used in power systems, and the harmonic analyzer displays up to the 50th harmonic, capturing all significant power system harmonics typically present.
What input signal levels can the GAD 201 G safely measure?
The meter accommodates signal levels from approximately 10 mV to 300 V depending on the input impedance selection and attenuation settings. The switchable input impedance (typically 600Ω or 1MΩ) and adjustable attenuation dial allow you to optimize the input range for your specific signal level without requiring external amplification or voltage dividers. Always verify that the fundamental frequency peak on the display is positioned near the center of the scale to ensure adequate headroom and prevent clipping distortion that would corrupt the measurement.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy GW Instek GAD 201 G Automatic Distortion Meter Online in India
Purchase the GW Instek GAD 201 G Automatic Distortion Meter online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on GW Instek GAD 201 G Automatic Distortion Meter with fast shipping and expert support.