JINGYAN MESR-100 ESR Capacitor Tester Ohm Meter User Guide
- May 15, 2024
- JINGYAN
Table of Contents
JINGYAN MESR-100 ESR Capacitor Tester Ohm Meter
Product Information
- The MESR100 V2 is an auto-ranging capacitor ESR and Low Ohm Meter designed for measuring capacitors in a circuit.
- It uses a true 100 KHz sine wave to measure the ESR value, allowing for accurate testing similar to capacitor manufacturers’ methods.
- The device can help identify bad or damaged capacitors based on their ESR values, which indicate larger ripple and potential issues with filtering noise.
Features
- Measuring range from 0.001 to 100.0R
- Supports in-circuit testing
- Dual terminal for inspecting capacitors and resistors
- External USB power support via micro-USB port
Product Usage Instructions
Operating Instructions
- POWER ON: Press and hold the ON/OFF circle orange button for 2 to 3 seconds to power on. Press and release the button to shut down the meter.
- AUTO/MANUAL mode:
- Auto Range: Press and release the RANGE button to enable auto mode.
- Manual Range: Scroll through the manual range options by pressing the RANGE button.
- 1 Key Zero: Short circuit the test leads’ terminal, then press and release the ZERO button to zero out wire resistance.
FAQ
- What is the ESR of a capacitor?
- The ESR (Equivalent Series Resistance) of a capacitor refers to the series resistor inside the capacitor. By using a 100kHz frequency, the device removes impedance and measures the true series resistor value, helping identify if a capacitor is bad or damaged.
- How can I use the MESR100 V2 for in-circuit testing?
- With its low testing voltage of less than 15mV DC, the MESR100 V2 can be used for in-circuit testing without turning on the semiconductor inside a circuit under testing. This feature is particularly useful when repairing electronic devices like TVs, LCDs, and audio boards.
MESR100 V2 User Guide V1.0
Features
- JINGYAN MESR-100 V2 Auto-ranging capacitor ESR and Low Ohm Meter Measuring range from 0.001 to 100.0R, support IN CIRCUIT Testing.
- Using true 100 KHz sine wave to measure the ESR value, which is equal to the testing method of capacitor manufacturer.
- In the market, some techniques use the short pulse method to testing, but the value will vary vs the capacitance and sometimes the reading is different from the manufacturer’s value.
- What is the ESR of a capacitor?
- There is a series resistor inside the capacitor, using 100kHz to remove the impedance 1/(2piF*C), the impedance becomes small, and we can then measure the true series resistor value.
- A bad E-capacitor will have a larger ESR and create a large ripple rather than filtering noise.
- Normally, a big capacitor is larger than 3 ohms.
- Using this theory, we can measure the capacitor is bad/ damaged or good in condition.
- Because our ESR meter only applies less than 15mV DC or peak to peak on a good capacitor, as a result we can use it as in circuit test. Because this low testing voltage, it cannot turn on the semiconductor inside a circuit under testing.
- During repairing TV, LCD, Audio board, etc. we can circuit testing the capacitor is good or not.
- Dual terminal, for fast and easy inspect general capacitor or resistor, a printed ESR table for fast check.
Compare MESR100 old V1 and new V2 Improvement
- Change square wave to sine wave 100 KHz, reduce square wave’s high-frequency component, and affect the reading passing the test leads and capacitor.
- Higher Resolution up to 0.001 ohm.
- 128X64 dot matrix LCD, with more larger value display and information
- Embedded 25V capacitor table at LCD, auto display the capacitor is good or bad reference to common 25V electrolytic capacitor.
- New plastic case, curve design for hand carrying. New stand for 60 degree stand on desk.
- Use 2X AA battery, more convenience and longer battery life than 9V battery.
- Support external USB power, using standard micro-USB port.
MEASURING 220uF 25V Electrolytic Capacitor Vpk to pk is 2.48mV Frequency is 100kHz Sine Wave
Specification
Range| Accuracy (After Zero, tested with 1,10,100R resistor)| Refresh Time (Manual Mode)
*Auto mode take 0 to 2s more time depend on value
---|---|---
0.000 to 1.000R| 1%+2Digit| ~0.4s
1.000 to 10.00R| 1%+1Digit| ~0.4s
10.00 to
100.0R
| 2%+1Digit| ~0.4s
Accuracy may be affected by the test lead’s length and contact point
resistance.
Standard test leads are 15cm, longer test leads need special shielding to
affect the EMI inference (Can contact sales’ salesperson for more details)
- Accuracy: Up to 1% (detail in above table) Wide Measurement Range: >1uF (for 0.1uF the error will be larger on equation 1/(2piF*C) @ 100Khz )
- High Resolution: 4 digits, or 0.001Ohm @ 1 Ohm range
- Measuring voltage: <~40mV RMS (TESTING VOLTAGE)
- Clamping voltage: ~0.15V (open voltage)
- Battery 2X AA 1.5V battery
- External Power: 5V micro USB
- Operating current 0.02A
- Battery Lifetime: >80 Hours
Operating Introduction
POWER ON
- Press and hold the ON/ OFF circle orange button for 2 to 3 seconds to power on.
- Press and release the ON/ OFF button to shut down the meter.
AUTO/ MANUAL mode
- Auto Range:
- Press and release the RANGE button and at the first line of LCD will show “AUTO:”
- At auto mode meter will automatically select the best range to detect.
- Manual Range:
- Scroll the manual range from 1R, 10R and 100R range by press and release the RANGE button
- In LCD will show MANUAL at first LCD line and show at second line: 0-1R, 1-10R and 10-100R.
Key Zero:
Short circuit the test leads’ terminal, cancelling the wire resistance.
Press and release the “ZERO” button, LCD shows “ZERO” and wait the zero to
disappear.
If you are using the meter array socket, you need to use a short pin to short
circuit to set zero.
Backlight:
LCD backlight will be on during power-on
Auto Sleep:
After around 10 hours of not testing, it will shut down automatically to save
power.
OVERFLOW or OL:
Display overflow when the value is out of range, you can check that you are
zero correctly.
ESR TABLE:
It is for reference only, different manufacturer of capacitors has different
ESR, better to test a good cap ESR and compare with what you are testing,
usually bad cap with higher ESR few times larger than good one.
SOFTWARE ESR:
Put the 25V Electrolytic capacitor value to LCD, and compare,
GOOD if C < XXuF means the capacitor may be in good condition if it is less
than XXuF
PLASTIC STAND:
If you don’t use the stand, press and push the lock position:
- PLEASE DISCHARGE THE CAPACITOR BEFORE TESTING, you can use a screwdriver to short circuit, or series with a resistor around 10 ohm and short for 5 to 10s.
- There is 2 fast diodes inside the meter to prevent high voltage, but it is important to discharge the capacitor firstly, as it is a large surge current and voltage and may damage the meter.