1. Product Overview

Model: ST201 Digital Clamp Multimeter Display: 3½ digits, 1999 counts LCD Power Supply: 2 × 1.5V AAA batteries (Batteries NOT included) Functions: AC Voltage, DC Voltage, AC Current, Resistance, Diode Test, Continuity Buzzer, Data Hold, Auto Power Off Safety Standard: IEC 61010, CAT II 600V

2. Panel Introduction

Clamp Jaw: For AC current measurement
Rotary Function Selector: Switch measurement modes
HOLD Button: Freeze the reading on screen
Backlight Button: Turn LCD backlight ON/OFF
COM Jack: Common input for black test lead
VΩ Jack: Input for red test lead for voltage, resistance, diode test

3. Operation Instructions

3.1 AC Voltage Measurement

Turn rotary switch to ACV range.
Insert black lead into COM jack, red lead into VΩ jack.
Connect two probes across the measured power source / load.
Read value on LCD.

3.2 DC Voltage Measurement

Turn rotary switch to DCV range.
Connect probes to the tested object, red for positive, black for negative.

Note: If display shows negative value, reverse the probes.

3.3 AC Current Measurement (Clamp Mode)

Turn rotary switch to A~ range.
Open the clamp jaw, clamp ONLY ONE single wire inside the jaw.
Close the jaw tightly, then read the AC current value. ⚠️ Important: Do NOT clamp two wires at the same time.

3.4 Resistance Measurement

Switch to Ω range.
Disconnect power from the tested resistor completely.
Connect two probes to both ends of resistor.

“OL” means over-range.

3.5 Continuity Buzzer Test

Switch to continuity gear.
Connect probes to two points of the circuit.
The buzzer will sound if resistance is low (circuit conducts).

Do not test live circuits.

3.6 Diode Test

Switch to diode symbol gear.
Red probe to diode anode, black probe to cathode. Read forward voltage.
Reverse connection shows “OL”.

3.7 Data Hold

Press HOLD button to lock current reading; press again to release.

3.8 Auto Power Off

The meter will shut down automatically after about 15 minutes of idle operation to save battery. Press any button to restart.

4. Specifications

表格

Function	Range
DC Voltage	200mV ~ 600V
AC Voltage	200mV ~ 600V
AC Current	2A ~ 400A
Resistance	200Ω ~ 20MΩ
Diode Test	Approx. 0–1.5V
Continuity Buzzer	<50Ω buzzer on

5. Maintenance

Clean the housing with soft dry cloth; do not use solvent.
Remove batteries if the meter will not be used for a long time to avoid leakage.
Do not open the meter housing unless replacing batteries.
Keep the clamp jaw clean for accurate current reading.

6. Packing List

1 × ST201 Clamp Multimeter 1 × Pair of Test Leads 1 × User Manual

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