GW Instek GAD-201G User Manual

GAD-201G user manual

TABLE OF CONTENTS PAGE

1. PRODUCTION INTRODUCTION.............................1

2. SPECIFICATIONS........................................................2

3. PRECAUTIONS BEFORE OPERATION..................4

4. PANEL INTRODUCTION...........................................6

5. OPERATING INSTRUCTIONS................................11

6. MAINTENANCE.........................................................14

6-1. Line fuse replacement..........................................14

6-2. Cleaning.................................................................14

SAFETY TERMS AND SYMBOLS

These terms may appear in this manual or on the product:

WARNING: Warning statements identify condition or practices that could result in injury or loss life.

CAUTION: Caution statements identify condition or practices that could result in damage to this product or other property.

Measurement category I is for measurements performed on circuits not

directly connected to MAINS. Measurement category II is for measurements performed on circuits directly connected to the low voltage installation. Measurement category III is for measurements performed in the building installation. Measurement category IV is for measurements performed at the source of the low-voltage installation.

DANGER

High

Voltage

ATTENTION

Refer to Manual

Protective

Conductor

terminal

Frame or

Chassis

Terminal

Earth

(ground)

Terminal

GAD-201G user manual

1. PRODUCTION INTRODUCTION

The model GAD-201G Automatic Distortion Meter is designed to measure the total distortion down to 0.1% full scale at any frequency between 20Hz and 20kHz.

The instrument provides the function of automatic tuning, auto ranging and automatic level control circuit to save the time of adjustment, frequency tuning control and input level setting control.

The instrument uses two meters allowing simultaneous level and distortion measurements. The range selection for both distortion and level measurements is automatically made with a reed relay.

The instrument also equips with a frequency holding selector to keep a spot frequency in a suitable condition to measure distortion factor of audio equipment, such as FM/AM radios, stereo amplifiers, tape recorders,…etc.

Besides, the instrument uses X axis and Y axis two outputs to observe the waveforms of the input signal and the total harmonics. All these features allow an easy measurement of Lissajous’ figure distortion and the analysis of distortion accuracy.

2. SPECIFICATIONS

Distortion Measurements

Measure Range 0.1% to 10% full scale in 7 ranges by auto ranging Fundamental Frequency

range Input level 100mVrms to 300Vrms Fundamental Harmonic

Rejection Ratio Secondary Harmonic Accuracy

Residual Distortion Less than 0.03% (including hum and noise) Maximum Input

Voltage

AC Voltage Measurements

Level measurement on AC voltage ranges

Decibel range Decibel scale -20dB to +1dB (0dB=1V)

Accuracy Frequency response

Residual noise Input impedance

20Hz to 20kHz 3 ranges continuous fine adjustme nt , 3 spot frequency: 400Hz, 1kHz, and 10kHz±1% only

80dB above

Within ±1dB at a basic frequency of 20Hz to 20kHz.

DC +AC peak, 400V or less

1mVrms to 300Vrms full scale in 12 ranges by auto ranges

-60dB to +50dB in increments of 10dB

-60dBm to +50dBm in increments of 10dBm

-20dBm to +3.2dBm (0dBm=1mW, 600Ω) Within ±3% of full scale (at 1kHz) Within ±0.5dB, 20Hz to 200kHz for 100mV to 300mV

ranges Within ±1dBm, 20Hz to 200kHz for 1mV to 30mV ranges Less than 10μV with input short circuit

100kΩ±10%, 70pF or less (unbalance)

GAD-201G user manual

X Output: Approx. 1Vrms at full scale in measuring input level

Output terminal

Output impedance Power source 100/120/220/240V, 50/60Hz, 25VA, 10Watts Stability against line

voltage fluctuation: Dimensions 310 (W) × 165(H) × 265(D) mm Weight Approx. 4.6 kg

Accessories

Operation Environment

WARNING: To avoid electrical shock, the power cord protective grounding conductor must be connected to ground.

CAUTION: To avoid damaging the instrument, don’t use it in a place where ambient temperature exceeds +50℃.

Y Output: Approx. 500mVrms at full scale in measuring distortion Factor (total harmonic signal output)

Approx. 600Ω

The indication of line voltage fluctuation is changed to ±10%, within ±0.5% of full scale.

Test leads GTL-103 × 1 User Manual × 1 Indoor use Altitude up to 2000m Installation category II Pollution Degree 2

3. PRECAUTIONS BEFORE OPERATION

Unpacking the instrument

The product has been fully inspected and tested before shipping from the factory. Upon receiving the instrument, please unpack and inspect it to check if there is any damage caused during transportation. If any sign of damage is found, notify the bearer and/or the dealer immediately.

Checking the Line Voltage

The instruments can be applied with any kind of line voltage shown in the table below. Before connecting the power plug to an AC line outlet, make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage. It might be damaged the instrument if connected to the wrong AC line voltage.

When line voltages are changed, replace the required fuses shown as below:

Line voltage Range Fuse Line voltage Range Fuse

100V 120V

Maximum input voltage

Any input voltage over the maximum specific voltage can damage the instrument. The specific voltage is determined by how much the peak value of the input signal is adding plus the superimposed DC voltage.

90-110V

108-132V

T 0.3A

250V

220V 240V

198-242V 216-264V

T0.2A

250V

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