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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,
there is some technique using short pulse method to testing, but the value
will be varying vs the capacitance and sometimes reading is different from
the manufacturer's value.
What is ESR of
capacitor?
There is a series
resistor inside capacitor, using 100kHz to remove the impedance
1/(2*pi*F*C), the impedance become small, and we can then measure the true
series resistor value.
A bad E-capacitor
will have larger ESR and create large ripple rather than filtering noise.
Normally, a big capacitor is larger than 3 ohm.
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 in 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:
1)
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.
2)
Higher Resolution
up to 0.001 ohm.
3)
128X64 dot matrix
LCD, with more larger value display and information
4)
Embedded 25V
capacitor table at LCD, auto display the capacitor is good or bad reference
to common 25V electrolytic capacitor.
5)
New plastic case,
curve design for hand carrying. New stand for 60 degree stand on desk.
6)
Use 2X AA battery,
more convenience and longer battery life than 9V battery.
7)
Support external
USB power, using standard micro-USB port.
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 maybe
affected by the test lead’s length and contact point resistance.
Standard test leads
is 15cm, for longer test leads need special shielding to affect the EMI
inference (Can contact sales’ person for more detail)
1)
Accuracy: Up to 1%
(detail on above table)
Wide Measurement
Range: >1uF (for 0.1uF the error will be larger on equation 1/(2*pi*F*C) @
100Khz )
2)
High Resolution: 4
digit, or 0.001Ohm @ 1 Ohm range
3)
Measuring voltage:
<~40mV RMS (TESTING VOLTAGE)
4)
Clamping voltage:
~0.15V (open voltage)
5)
Battery 2X AA 1.5V
battery
6)
External Power: 5V
micro USB
7)
Operating current
0.02A
8)
Battery Life time:
>80 Hours
Operating
Introduction:
1)
POWER ON
Press and hold the
ON/ OFF circle orange button for 2 to 3 second to power on.
Press and release
the ON/ OFF button to shut down meter.
2) AUTO/ MANUAL
mode:
i) 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.
ii) 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.
3) 1 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 disappear.
If you are using
the meter array socket, you need to use a short pin to short circuit to set
zero.
4) Backlight:
LCD backlight will
on during power on
5) Auto Sleep:
Around 10 hours for
not testing, it will shut down automatically to save power.
6) OVERFLOW or OL:
Display overflow
when the value is out of range, you can check that you are zero correctly.
7) ESR TABLE:
It is for reference
only, different manufacturer of capacitor 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.
8) SOFTWARE ESR:
Put the 25V
Electrolytic capacitor value to LCD, and compare,
GOOD if C < XXuF,
means the capacitor maybe good condition if it is less than XXuF
9) PLASTIC STAND:
If you don’t use
the stand, press and push the lock position:
Package Content
1 unit
MESR-100 V2
1 pair 15cm test
clips (as photo) | 
