Sanwa SP-18D Analog Multitester Instruction Manual

1. Introduction

This manual provides detailed instructions for the safe and effective use of the Sanwa SP-18D Analog Multitester. This portable instrument is designed for low-voltage circuit measurements and is suitable for various applications in small communications equipment, home electrical appliances, and other general electrical work.

Figure 1: Sanwa SP-18D Analog Multitester. This image shows the front view of the multitester with its analog display, rotary selector switch, and input jacks for test leads.

2. Applications and Features

The Sanwa SP-18D Analog Multitester offers a range of features designed for practical and reliable electrical measurements:

• Integrated Design: The instrument and its protective case are combined into one body, enhancing portability and ease of storage.
• High Resistance Measurement: Capable of measuring resistance up to 200MΩ even under low voltage (3V).
• Capacitance Measurement: Supports capacitance measurements ranging from 0.01µF to 1000µF.
• Battery Check Function: Includes a dedicated function for checking battery status.
• LED Check: The 3V terminal voltage for resistance measurement allows for checking LEDs.
• Protective Cover: Features a front panel protection cover that also doubles as a stand for convenient viewing.
• Drop Shock Proof: Designed to withstand accidental drops, ensuring durability.

Figure 2: Overview of Sanwa SP-18D Applications and Features. This image highlights the key functionalities and design aspects of the multitester.

3. Setup and Preparation

3.1. Unpacking and Inspection

Upon receiving your Sanwa SP-18D Multitester, carefully unpack all components and inspect them for any signs of damage. The standard accessories include the Sanwa SP-18D unit and an instruction manual.

Figure 3: Contents of the Sanwa SP-18D package. This image displays the multitester, its retail box, and the included instruction manual.

3.2. Battery Installation

The Sanwa SP-18D requires 1 Lithium Metal battery (included) for operation. Refer to the battery compartment on the rear of the device for proper installation. Ensure correct polarity.

Figure 4: Rear view of the Sanwa SP-18D. This image shows the back of the multitester, including the battery compartment cover.

3.3. Test Lead Connection

Connect the red test lead to the positive (+) input jack and the black test lead to the common (-) input jack on the multitester. Ensure connections are firm.

4. Operating Instructions

Before taking any measurements, ensure the multitester is set to the appropriate range and function. Always start with a higher range if the expected value is unknown to prevent damage to the meter.

4.1. DC Voltage (DCV) Measurement

1. Set the rotary switch to the desired DCV range (e.g., 0.3V, 3V, 12V, 30V, 120V, 600V).
2. Connect the red test lead to the positive side of the circuit and the black test lead to the negative side.
3. Read the voltage value from the DCV scale on the analog display.

4.2. AC Voltage (ACV) Measurement

1. Set the rotary switch to the desired ACV range (e.g., 12V, 30V, 120V, 300V, 600V).
2. Connect the test leads across the AC voltage source.
3. Read the voltage value from the ACV scale on the analog display.

4.3. DC Current (DCA) Measurement

1. Caution: Always connect the multitester in series with the circuit for current measurement.
2. Set the rotary switch to the desired DCA range (e.g., 0.3mA, 30mA, 0.3A).
3. Break the circuit and insert the multitester in series, ensuring correct polarity.
4. Read the current value from the DCA scale.

4.4. Resistance (Ω) Measurement

1. Set the rotary switch to the desired resistance range (e.g., x1, x10, x100, x1k, x10k, x100k).
2. Before measuring, short the test leads together and adjust the "Ω ADJ" knob until the pointer reads zero on the resistance scale.
3. Connect the test leads across the component to be measured. Ensure the circuit is de-energized.
4. Read the resistance value from the Ω scale and multiply by the selected range multiplier.

4.5. Capacitance (µF) Measurement

1. Set the rotary switch to the capacitance measurement function (if available, or use the appropriate resistance range for charging/discharging).
2. Connect the test leads across the capacitor. Observe the pointer's movement.
3. The pointer indication of the maximum move by charged current in the capacitor is used for measurement.

4.6. Battery Check

1. Set the rotary switch to the "Battery Check" function (1.5V or 1.5V Coin battery).
2. Connect the test leads to the battery terminals, observing polarity.
3. Read the battery status from the designated scale.

Figure 5: Sanwa SP-18D in use, demonstrating its compact design and ease of handling.

5. Maintenance and Care

5.1. Cleaning

Wipe the multitester with a soft, dry cloth. Do not use abrasive cleaners or solvents, as they may damage the casing or display.

5.2. Battery Replacement

When the battery check indicates low power or the meter's readings become erratic, replace the battery. Open the battery compartment on the rear of the unit, remove the old battery, and insert a new one, ensuring correct polarity. Dispose of old batteries responsibly.

5.3. Storage

Store the multitester in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the battery to prevent leakage.

6. Troubleshooting

7. Specifications

The following table details the technical specifications of the Sanwa SP-18D Analog Multitester:

Figure 6: Detailed Specifications for Sanwa SP-18D. This table provides specific measuring ranges and accuracy for various functions.

Note: The value in parentheses at DCV and ACV is input resistance. Pointer indication of the maximum move by charged current in the capacitor.

8. Warranty and Support

For warranty information and technical support, please refer to the documentation included with your purchase or contact GuliTech customer service. Keep your purchase receipt as proof of purchase.

For further assistance, you may visit the GuliTech brand page on Amazon: GuliTech Amazon Store