PCE Instrument PCE-MO 2001 Milliohm Meter Instruction Manual

PCE Instrument PCE-MO 2001 Milliohm Meter

Milliohm Meter – PCE-MO 2001

Specifications

General Specifications

• Display: 18 mm (0.7) LCD, Max. indication 1999
• Range: 200 m ohm, 2,000 m ohm, 20 ohm, 200 ohm, 2000 ohm
• Zero Adjustment: External adjustment for zero value of the display. Adjusting range approx. 100 counts
• Input Terminal: 4 terminal input, accurate for low ohms measuring
• Over input Indication: Indication of 1
• Sampling Time: Approx. 0.4 sec
• Operating Temp.: 0 to 50°C (32 to 122°F)
• Operating Humidity: Less than 80% R.H.
• Power Supply: AC 110V 10%, 50/60 Hz or AC 220V/240V 10%, 50/60 Hz
• Power Consumption: Less than 2.5 VA
• Dimension: 170 x 120 x 90 mm, with housing front cover
• Weight: Approx. 690 g (1.52 LBS)

Electrical Specifications

Remark: Spec. tested under the environment RF Field Strength less than 3 V/M & frequency less than the 30 MHz only.

Front Panel Description

Fig. 1

1. AC Power Input Socket
2. 4 Wires Input Terminal
3. Display
4. Zero Adjust Knob
5. Power Off/Range Rotary Switch

Basic 4 Wires Measuring Principle
The Digital Milliohm Meter is a precision, wide range, and small resistance with high resolution measuring instrument. To prevent any measuring errors, especially to avoid the influence of lead stray resistance or test wire’s resistance, the meter is designed according to the following 4 wires measuring principle to ensure high accuracy.

Precaution & Preparations for Measurement
Before using the Milliohm Meter, please take the following precautions and make necessary preparations

1. Make sure the Meter is in good condition and all accessories are included.
2. Ensure the Meter is properly connected to the power supply.
3. Check if the test wires are properly connected to the input terminals.
4. Perform zero adjustment to compensate for any offset.
5. Avoid strong electromagnetic fields and keep the Meter away from sources of interference.
6. Ensure the operating temperature and humidity are within the specified range.

Measuring Procedures
To measure the resistance using the Milliohm Meter, follow these steps:

1. Connect the test wires to the device under test.
2. Set the desired range on the Power Off/Range Rotary Switch.
3. Press the Power On button to turn on the Meter.
4. Wait for the Meter to stabilize and display the measured resistance.
5. Record the measured resistance if necessary.
6. Press the Power Off button to turn off the Meter.

FAQ

• Q: What is the measuring range of the Milliohm Meter?
  A: The Milliohm Meter has a wide measuring range from 0.1 m ohm to 2000 ohm, with 5 ranges available.

• Q: What is the sampling time of the Meter?
  A: The sampling time of the Meter is approximately 0.4 seconds.

• Q: Can I adjust the zero value of the display?
  A: Yes, the Meter has an external zero adjustment knob to calibrate the zero value of the display.

• Q: What is the power supply requirement for the Meter?
  A: The Meter can be powered by AC 110V (10%, 50/60 Hz) or AC 220V/240V (10%, 50/60 Hz).

• Q: Is the Meter suitable for measuring motor coils and PCB layouts?
  A: Yes, the Meter is ideal for measuring the resistance of motor coils, transformers, and PCB layouts.

Your purchase of this MILLIOHM METER marks a step forward for you into the field of precision measurement. Although this METER is a complex and delicate instrument, its durable structure developed. Please read the following instructions carefully and always keep this manual within easy reach.

FEATURES

• 4 terminal devices for accurate measurement of very low resistance.
• Ideal for measuring the resistance of the motor coil, transformer, PCB layout.
• Ideal for testing protective conductors, lightning conductors and welded points.
• Wide measuring range, 0.1 m ohm – 2000 ohm, 5 ranges.
• 18 mm, large size LCD display, easy to read-out.
• LSI circuit provides high accuracy, reliability and durability.
• Built-in over input.
• Durable & portable housing plastic case with the front protective cover.

General Specifications

Electrical Specifications (23 ±5℃)

Remark
Spec. tested under the environment RF Field Strength less than 3 V/M & frequency less than the 30 MHz only.

FRONT PANEL DESCRIPTION

Fig. 1

• AC Power Input Socket
• Wires Input Terminal
• Display
• Zero Adjust Knob
• Power Off/Range Rotary Switch

BASIC 4 WIRES MEASURING PRINCIPLE

The DIGITAL MILLIOHM METER is the precision, wide range & small resistance with high resolution measuring instrument. As for preventing any measuring errors, especial to avoid the influence of “LEAD STRAY RESISTANCE” or “TEST WIRE’S RESISTANCE”. The meter is designed according the following “4 WIRES MEASURING PRINCIPAL” to let the meter within high accuracy.

• Please refer to 2-2 Electrical Specification, each range exist the exciting test current (from Hi to Lo terminal).
• The standard current is dropped to the unknown resistor Rx.
• From the terminal Rx1, Rx2 can measure a voltage: Vx = Is x Rx.
• According the Vx value, then meter can get the unknown resistance (Rx) values from following formula
• The measured resistance between Rx 1 and Rx 2 is not affected by any stray resistance of test wire.

PRECAUTION & PREPARATIONS FOR MEASUREMENT

• Please check carefully if the meter’s power supply is AC 110 V or AC 220 V before operating the meter. There is a label at the rear of the meter to show the proper power source outlet AC 110 V or AC 220 V.
• Please don’t input voltage to input terminal ( Lo, Rx1, Rx2, Hi ) to prevent any internal circuit damage.

MEASURING PROCEDURES

1. Rotate the ” Power off/Range Rotary Switch ” ( 3-5, Fig. 1 ) to the convenient & right range 200 m ohm, 2000 m ohm, 20 ohm, 200 ohm, 2000 ohm.

2. After select the above right range, then should make the following ” ZERO ADJ. PROCEDURE ”

   • Short the 2 clips.
   • Rotate the ” Zero Adjust Knob ” (3-4, Fig. 1) until the display reading values show the zero values.
   • Consideration
   • Zero adjustment is necessary for range 200 m ohm, 2000 m ohm, 20 ohm only.
   • Recommend user select 200 m ohm range to make “ZERO ADJ. PROCEDURE”

3. Connect the 2 clips as following Fig. 3 to measure the unknown resistance.

4. Connect the 2 Kelvin clips as following Fig. 4 to measure the unknown resistance between two test points, such as PCB layout.

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