Lutron Electronics MO-2014 User manual

10 Amperes max. test current
Micro-Ohm Mete
r
Model : MO-2014
Y
our purchase o
f
this Micro-Ohm
METER marks a
step forward for
you into the field o
f
precision
measurement.
A
lthough this
Micro-Ohm METER
is a complex and
delicate instrument,
its durable structure
will allow many
years of use i
f
proper operating
techniques are
developed. Please
read the following
instructions
carefully and always
keep this manual
within easy reach.
OPERATION MANUAL

TABLE OF CONTENTS
1. FEATURES..............................................................
.
1
2. SPECIFICATIONS.....................................................1
2-1 General Specifications........................................
.
1
2-2 Electrical Specifications.......................................2
3. FRONT / REAR PANEL DESCRIPTION........................ 3
4. BASIC 4 WIRES MEASURING PRINCIPLE................... 4
5. PRECAUTION & PREPARATIONS FOR
MEASUREMENT.......................................................5
6. MEASURING PROCEDURES......................................
.
5
6-1 Buttons instructions ....................................... 5
6-2 Symbols & units of display.................................. 6
6-3 Resistance Measurement.................................... 6
7. HI / LO WARNING SETUP........................................
.
7
8. CALCULATE CABLE / WIRE LENGTH.........................
.
9
9. RS232 PC SERIAL INTERFACE.................................. 10
10. BATTERY REPLACEMENT........................................11

1. FEATURES
*4 terminal devices for accurate measurement of very
low resistance.
*Ideal for measuring the resistance of components
precisely.
*Ideal for testing protective conductors, lightning
conductors and welded points.
*Maximum test current is 10A ( 60000 uΩrange only ).
*Have two working mode , Resistive and Inductive mode,
Normal is resistive mode.
*Good / Fail set-function for input quality control.
*Built-in in buzzer sound (GOOD STATUS) to assist the Q.C.
j
udgment.
*Especial "CALCULATE" function to measure cable /
wire length.
*Wide measuring range, 5 u Ω- 6K Ω, 6 ranges.
*Large size and back-light LCM display, easy read-out.
*LSI circuit provides high accuracy, reliability and
durability.
*Built-in over input protection.
*Durable bench type housing plastic case stand.
2. SPECIFICATIONS
2-1 General Specification
s
Test Range 60000 uΩ( 10 A DC )
(Test Current) 600 m Ω( 1 A DC )
6000 mΩ( 100 mA DC )
60000 mΩ( 10 mA DC )
600 Ω( 1 mA DC )
6000 Ω( 100 uA DC )
Warning Setup * Warning LCD Indicator
* Buzzer
Operating Temp. 0 to 50 ( 32 to 122 ).℃℉
Operating Humidit
y
Less than 80 % R.H..
Power Supply DC 1.5 V , AA (UM-3)Battery X 8 PCs .
AC to DC 9V Power adapter .
1

Fuse protect * 10 A / 250 V
* Size : 6.3 X 32 mm dia..
Dimension 225 x 125 x 64 mm
( 8.86 x 4.92 x 2.52 inch)
Weight Approx. 790 g ( 1.74 LB ).
Standard 4 wire with 2 Kelvin clips........1 pair
Accessories Instruction Manual.................1 PC
AC/DC 9V power adapter........... 1 set
Optional * USB cable, USB-01.
Accessories * RS232 cable, UPCB-02.
* Data Acquisition software,
SW-U801-WIN., SW-E802.
* SD card data recorder, DL-9602SD
2-2 Electrical Specifications ( 23± 5 )℃
Range Resolution Test current Accuracy
60000 u Ω1 u Ω10 A
600 m Ω10 u Ω1 A
6000 mΩ100 u Ω100 mA ± ( 0.25 % + 25 d )
60000 mΩ1000 u Ω10 mA
600 Ω10 mΩ1 mA
6000 Ω100 mΩ100 uA ± ( 0.75 % + 3 d )
@ The above accuracy is based on the reading value.
@ Spec. tested under the environment RF Field Strength less
than 3 V/M & frequency less than the 30 MHz only.
Range Open Circuit Voltage
60000 u ΩApprox. DC 4.33 V
600 m ΩApprox. DC 4.33 V
6000 mΩApprox. DC 4.33 V
60000 mΩApprox. DC 4.33 V
600 ΩApprox. DC 4.33 V
6000 ΩApprox. DC 4.33 V
2

3. FRONT/REAR PANEL DESCRIPTION
Fig. 1
3-1 Display 3-11 Force Terminal "+"
3-2 Backlight key button 3-12 Sense Terminal "+"
3-3 Zero key button 3-13 Sense Terminal "-"
3-4 SET / TEST key button 3-14 Force Terminal "-"
3-5 HOLD key button 3-15 RS232 socket
3-6 START / STOP key button 3-16 Reset button
3-7 L / key button▲3-17 DC 9V power adapter socket
3-8 Beep / key button 3-18 Battery Cover / Battery
3-9 COMP / key button▼
compartment
3-10 Power / Range rotary 3-19 Stand
switch 3-20 AC/DC 9V power adapter
3-21 Battery cover screws
3

4. BASIC 4 WIRES MEASURING
PRINCIPLE
The DIGITAL MICRO-OHM METER is a precise,
wide range, small resistance and high resolution
measuring instrument. As for preventing 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 PRINCIPAL" to maintain the meter in
high accuracy.
Fig. 2
*Please refer to 2-2 Electrical Specification ( page 2 ),
each range exists fixed test current ( from 6000 Ωto
60000 uΩ.
*
T
he fixed current flow through the unknown resistor Rx.
*From the terminal " Sense + " and " Sense - " can measure
a voltage Vx = Is x Rx.
*According the Vx value, then meter can get the unknown
resistance (Rx) values from following formula :
Rx = Vx / Is
*
T
he measured resistance value between "Sense +" and
"Sense -"is not affected by any stray resistance of test wire.
4

5. PRECAUTION & PREPARATIONS FOR
MEASUREMENT
*Please check carefully the meter's power supply is DC
9V power adapter before operating at 60000 uΩrange .
*It's prohibited to input voltage to the 4 wire input
terminal ( Force +, Sense +, Sense -, Force - ) to
prevent any internal circuit damage.
6. MEASURING PROCEDURES
6 -1 Buttons instructions
Buttons Functio
n
Backlight Press this key to turn backlight on and
Button off.
ZERO Button When the display indicate few reading
before measure .
SET/TEST Press this key to do HI / LO limit
Button setup.
Press this key return to TEST status.
HOLD Button Press this key to do data hold .
START/STOP Press this key to starting measurement
Button or stop.
L/ Button▲Press this key to setting work mode
(Resistive or Inductive).
Press this key to adjust up value.
BEEP/ Press this key to open / close buzzer
Button function.
Press this key to select digit unit.
COMP / ▼Press this key to start "GOOD , FAIL "
Button status judgment.
Press this key to adjust down value.
5

6 -2 Symbols & units of display
Symbol & Functio
n
Unit
uΩ,mΩ,ΩOhm unit
.))) Appears on the "BEEP" function have
started.
HOLD Appears on the"HOLD" function have
started.
GOOD It is pass Q.C. Appears on finished
compare operate.
FAIL It is higher or lower than maximum or
minimum acceptance value . Appears
on finished compare operate.
COMP Appears on the"COMPARE" function.
LAppears on the"INDUCTIVE" mode.
H I Appears to showing H I limit.
LO Appears to showing LO limit.
6 -3 Resistance Measurement
1) Power on the instrument by rotate the "Power /
Range rotary switch" ( 3-10, Fig. 1 ) to exit the " OFF "
position and then select measuring range from 60000 uΩ
to 6000 Ωaccording to your requirement.
Note
:
*Always select the highest range ( 6000 Ω
) if you don't know the resistance value o
f
the resistor and then select lower rang
e
in sequence.
*At 60000 uΩ( 10A )must use DC 9V
adapter from socket ( 3-17, Fig. 1 ).
*Over range LCD shows " ----- ".
*Can't measure the resistance value, LC
D
will show 0.0000, 0.000 or 0.00.
6

2)Connect the
* Red cable ( with white O ring marker ) to " Force + "
terminal ( 3-11, Fig. 1 )
* Red cable ( no white O ring marker ) to " Sense + "
terminal ( 3-12, Fig. 1 )
* Black cable ( with white O ring marker ) to " Force - "
terminal ( 3-13, Fig. 1 )
* Black cable ( no white O ring marker ) to " Sense - "
terminal ( 3-14, Fig. 1 )
3)Connect the 2 Kelvin clips as following Fig. 3 to measure
the unknown resistance.
4)Press the "START / STOP" key ( 3-6, Fig. 1 ) will start
measure the unknown device.
Press once again will stop measure function and
froze the result at LCM.
5)When your tested material has inductive, you can press
" L/ " key ( 3-7, Fig. 1 ) for change to inductor mode▲
( at 600 mΩand 60000 uΩrange) , Display will showing
" L " mark. normal is resistor mode.
7. HI/LO WARNING SETUP
This instrument has Hi, Lo warning value setup function
and a buzzer which are specially designed for quality
control.
Primary to press the " SET / TEST " ( 3-4, FIG. 1 )
button enter setting mode.
1) Hi warning value setup
T
he last digit should flash at " H i warning value " on
the display . Then press " L / " buttons ( 3-7, Fig.▲
1 ) to increase or " COMP / " buttons ( 3-9, Fig. 1 )▼
to decrease digit that you want to alter large value,
7

press the " BEEP / " buttons (3-8 , Fig. 1) set
warning value , When user to move 1st digit unit to
next digit unit (10th, 100th. 1000th).
* Hypothesize display be set at 180.00 .
2) LO warning value setup
Finished (1) procedure then press the " SET / TEST "
button ( 3-4, Fig. 1 ) again, The last digit should flash
at " LO warning value " on the display . Other
operate way same above explain.
* Hypothesize display be set at 179.00 .
3)Finished (1)(2) procedure then press the " SET /
T
EST " button ( 3-4, Fig. 1 ) once . The function
should return to TEST MODE and indicate measure
value when clipping the resistor.
4)When measuring period press " COMP / " ( 3-9 ,▼
Fig. 1) button once, The display will show " GOOD "
or " FAIL " symbol to inform be measure results.
For example
a.
T
he value was readout 179.50 , The display
should show " GOOD " symbol and buzzer sounds.(
If buzzer function have been press on status, The
buzzer sounds can to assist Q.C judgment ) The
resistance value within the accuracy Pass the Q.C.
*
Press " BEEP / " ( 3-8, Fig 1) button once
will start buzzer, press once again to disable
" BEEP " function.
b.
T
he value was readout 180.10 or 178.60, The
display should show " FAIL " symbol, The
resistance value out of the accuracy.
8

8. CALCULATE CABLE/WIRE LENGTH
Before calculate cable length . You should sampling one
unit length (meter or feet).
1)Primary to take one sample from a lot of cable or
wire then to to measure 1 m or 1 feet length - unit.
2)Measue the unknown cable . wait a moment unitl the
reading have been stable . Stop the measure action
and hold the range.
3)Press " HOLD " button ( 3-5, Fig. 1 ) to release HOLD
status.
4)Press " SET / TEST " button ( 3-4 , Fig.1) more than
three secoends into sample unit mode.
5)Then press " L / " button ( 3-7 , Fig.1) or " COMP /▲
" button( 3-9 , Fig.1) to select unit (meter or feet).▼
6)Press " START / STOP " button ( 3-6 , Fig.1) to
sampling unit value.
7)Press " SET / TEST " button ( 3-4 , Fig.1) to save the
value and showing the cable length .
Now is already measurement unknown cable length.
8)Once press "SET / TEST" button ( 3-4 , Fig.1) more
than 3 secend . Will return to measure mode .
9

9. RS232 PC SERIAL INTERFACE
The instrument has RS232 PC serial interface via a 3.5
mm terminal ( 3-15, Fig. 1 ).
The data output is a 16 digit stream which can be
utilized for user's specific application.
A RS232 lead with the following connection will be
required to link the instrument with the PC serial port.
Meter PC
( 9W " D" Connector)
Center Pin.........................
.
Pin 4
(3.5 mm jack plug)
Ground/shield.......................Pin 2
2.2 K
resistor
Pin 5
The 16 digits data stream will be displayed in the
following format :
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Each digit indicates the following status :
D15 Start Word, 02
D14 4
D13 1
10

D12, D11 Annunciator for Display
Ω= 38 mΩ= B1 uΩ= F5
D10 Polarity
0 = Positive 1 = Negative
D9 Decimal Point(DP), position from right to the
left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
D8 to D1 Display reading, D1 = LSD, D8 = MSD
For example :
If the display reading is 1234, then D8 to
D1 is : 00001234
D0 End Word, 0D
RS232 FORMAT : 9600, N, 8, 1
Baud rate 9600
Parity No parity
Data bit no. 8 Data bits
Stop bit 1 Stop bit
10. BATTERY REPLACEMEN
T
1)
When the left corner of LCD display show " ", it
is necessary to replace the battery. However, in-spec.
measurement may still be made for several hours after
low battery indicator appears before the instrument
become inaccurate.
2)Loose the " Battery Cover Screws " ( 3-21, Fig. 1 )
and take away the " Battery Cover " ( 3-18, Fig. 1 )
from the instrument and remove the battery.
3)Replace with DC 1.5 V battery ( UM3, AA,
Alkaline/heavy duty ) x 8 PCs, and reinstate the cover.
4)Make sure the battery cover is secured after changing
the batteries
11
1403-MO2014