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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

GAD-201G user manual

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

Summary of content (8 pages)

PAGE 1
GAD-201G user manual GAD-201G user manual TABLE OF CONTENTS PAGE SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product: 1. PRODUCTION INTRODUCTION.............................1 2. SPECIFICATIONS........................................................2 3. PRECAUTIONS BEFORE OPERATION..................4 4. PANEL INTRODUCTION ...........................................6 5. OPERATING INSTRUCTIONS ................................11 6. MAINTENANCE...................................
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GAD-201G user manual 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.
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GAD-201G user manual GAD-201G user manual 3. PRECAUTIONS BEFORE OPERATION X Output: Approx. 1Vrms at full scale in measuring input level Output terminal Y Output: Approx. 500mVrms at full scale in measuring distortion Factor (total harmonic signal output) Approx. 600Ω Output impedance Power source 100/120/220/240V, 50/60Hz, 25VA, 10Watts The indication of line voltage fluctuation is changed to Stability against line ±10%, within ±0.5% of full scale.
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GAD-201G user manual GAD-201G user manual Full Scale The instrument uses a special extended scale with the reading range larger than the conventional full scale: Conventional Extended 0 to 1.0 0 to 1.12 0 to 3.1(3.2) 0 to 3.5 -20 to 0dB -20 to +1dB -20 to +2dBm -20 to +3.2dBm The rated value of full scale expressed in term of 1.0 on the 0~1.12 scales. Set the pointer to “1.0” on the outermost scale. 4. PANEL INTRODUCTION z Front Panel WARNING.
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GAD-201G user manual GAD-201G user manual z (1) INPUT terminal The terminal is used commonly for the measurements of distortion factor and AC voltage. (2) AUTO and HOLD function control The pushbutton is used for automatic measurement or holding the desired range during testing. (3) Function and Frequency range selector The selectors are used to set a basic frequency range of distortion factor.
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GAD-201G user manual GAD-201G user manual (7) (15) TUNING FREQ. setting knob Power switch Push the switch to left, and the pilot lamps corresponding to the measuring range will light up to indicate that the distortion meter is energized and ready for operation. (8) Measuring range pilot lamps Pilot lamps corresponding to the scale stage will light up according to the voltage level and distortion factor of the input signal. (9) The knob is used to adjust the frequency to a desired value.
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GAD-201G user manual GAD-201G user manual 5. OPERATING INSTRUCTIONS 5) Distortion measurement In order to reject the fundamental harmonics, the distortion meter is 1) Power on a. Set the POWER switch to “OFF” position. b. Check zero setting—If offset, adjust the pointer to zero by using a small screwdriver. c. Set the POWER switch to “ON” position. required the adjustment of the notch filter frequency. The instrument provides a. lamps are lighting on. b.
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GAD-201G user manual GAD-201G user manual Then, adjust (15) TUNING FREQ. knob to obtain the figure as shown on the Fig. 3 (b) and (c). 6. MAINTENANCE The following instructions should be performed by the qualified (a) (b) (c) personnel only in order to avoid electrical shock. Do not perform any servicing other than the operating instructions unless you are qualified to do so. 6-1. Line fuse replacement If the fuse is blown, the instrument would not work. Try to determine Fig.