Raytech Micro Junior 2 User manual

ENGLISH
INSTRUCTION MANUAL
MICRO JUNIOR 2
Micro Junior 2
RAYTECH AG , OBEREBENESTRASSE 11, CH-5620 BREMGARTEN, SWITZERLAND

Contents
1 Warranty Con itions 4
1.1 Limit tion of W rr nty..........................................................................................................4
1.2 Arbitr tion............................................................................................................................5
2 Safety Precautions 6
2.1 S fe oper tion.....................................................................................................................6
2.2 Keep w y from live circuits................................................................................................6
2.3 Do not oper te in n expolive tmosphere..........................................................................6
2.4 Do not subsitute p rts or modify Instrument........................................................................6
2.5 Before pplying power.........................................................................................................7
2.6 Ground the Instrument.........................................................................................................7
3 Unpacking 8
3.1 Option l Items.....................................................................................................................8
4 Technical Specifactions 9
5 Quick Start Gui e 10
5.1 Oper tion........................................................................................................................... 10
5.2 Single................................................................................................................................. 11
5.3 Cont...(Continuous)............................................................................................................11
5.4 Auto (Autom tic)................................................................................................................11
5.5 Cross Current me surements (Forw rd / Reverse)...........................................................12
6 Intro uction 13
6.1 E se of use.......................................................................................................................13
6.2 Impressive ccur cy..........................................................................................................13
6.3 Unique me suring technique.............................................................................................13
6.4 Oper tion........................................................................................................................... 13
6.5 Comp ct design.................................................................................................................13
6.6 Simple m inten nce..........................................................................................................13
6.7 Adv nced protection.......................................................................................................... 13
7 A vantages & Features 14
8 System Details 15
8.1 B ttery check.....................................................................................................................15
8.2 Li-Ion Ch rger.................................................................................................................... 15
8.2.1 Prec utions..............................................................................................................15
8.2.2 Fe tures.................................................................................................................. 15
8.2.3 Ch rging Instructions...............................................................................................16
8.2.4 Expl n tion of Ch rging Function............................................................................16
8.3 Limit tions of Resist nce Testing.......................................................................................17
8.4 Tr nsformer windings........................................................................................................17
8.5 Low Resist nce Testing.....................................................................................................17
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9 Front Panel Description 18
9.1 Typic l displ y screens......................................................................................................22
10 Operation Menu 23
10.1 Menu Structure................................................................................................................ 23
11 Main Menu 24
11.1 R nge Selection Screen..................................................................................................24
11.2 Archive Screens...............................................................................................................24
11.2.1 Show......................................................................................................................24
11.2.2 Print.......................................................................................................................25
11.2.3 Er se..................................................................................................................... 25
11.3 Setup Menu Screens.......................................................................................................25
11.3.1 Clock......................................................................................................................26
11.3.2 Interv l Test............................................................................................................26
11.3.3 Contr st................................................................................................................. 27
11.3.4 Printer....................................................................................................................27
11.3.5 Temper ture Correction.........................................................................................28
11.3.6 Length Correction (specific Resist nce).................................................................30
12 Testing Screen Description 31
12.1 R nge Selection..............................................................................................................31
12.2 Testing............................................................................................................................. 32
12.2.1 Single..................................................................................................................... 32
12.2.2 Cont (Continuous)..................................................................................................32
12.2.3 Auto.......................................................................................................................33
12.2.4 Inter… (Interv l).....................................................................................................34
12.2.5 Timer......................................................................................................................34
12.3 X10A / x1A (Forw rd / Reverse test)................................................................................35
12.3.1 Single..................................................................................................................... 35
12.3.2 Auto.......................................................................................................................36
12.4 Print.................................................................................................................................36
12.5 Store................................................................................................................................37
13 Measurement Parameters 38
Appendix....................................................................................................40
A Troubleshooting 41
B System Upgra es 43
C Contacts 44
D In ex 45
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1 Warranty Con itions
R ytech AG Switzerl nd sh ll t their option nd expense, rep ir or repl ce ny p rt or p rts th t
prove to be defective within the w rr nty limit tion period- irrespective of the oper ting time of the
test equipment provided th t the c use of the defect occurred prior to the time t which the risk
w s p ssed.
W rr nty cl ims re subject to w rr nty limit tion period of 24 months from the d te of shipment.
The purch ser is oblig ted to immedi tely notify R ytech AG Switzerl nd in writing of ny defects
of the supplied test equipment.
R ytech AG Switzerl nd must lw ys be given the opportunity to rectify defect within
re son ble mount of time. The purch ser sh ll gr nt n dequ te mount of time th t the test
equipment sh ll be rep ired.
R ytech AG Switzerl nd covers the costs ssoci ted with the rep ir of the defect; especi lly the
costs for the m teri l nd work. Cost for sending the f ulty test equipment sh ll be borne by the
purch ser. R ytech AG Switzerl nd sh ll not be li ble for m teri l d m ge, or fin nci l loss due to
the loss of production, loss of d t , loss of inform tion, d t or interest, reg rdless of their leg l
b sis.
W rr nty cl im rights on repl cement p rts s well s rep ir of defective p rts sh ll expire fter 12
months.
W rr nty limit tion period sh ll be extend ble ccording to the price list. The purch ser h s the
right to extend the w rr nty period by purch sing ddition l w rr nty ye rs.
1.1 Limitation of Warranty
The foregoing w rr nty sh ll not pply to defects resulting from:
•Improper nd un uthorized modific tions or misuse nd buse of the product, negligence,
lter tion, modific tion, f ulty inst ll tion by the customer, customer’s gents or
employees.
•Attempted or ctu l dism ntling, dis ssembling, service or rep ir by ny person, firm, or
corpor tion not specific lly uthorized in writing by R ytech GmbH Switzerl nd.
•Defects c used by or due to h ndling by c rrier, or incurred during shipment, tr ns-
shipment, or other move.
•In dequ te m inten nce by the customer, second source supplied softw re or interf cing,
oper tion outside the environment l limits, or improper site prep r tion.
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Exclusive remedies provided herein re the customer’s sole nd exclusive remedies.
R ytech Switzerl nd sh ll not be li ble for ny d m ges resulting from the use of this equipment
whether direct, indirect, speci l, incident l, or consequenti l d m ges, or whether b sed on
contr ct, tort, or ny other leg l theory.
1.2 Arbitration
All disputes rising out of or in connection with the contr ct between the purch ser nd R ytech
GmbH Switzerl nd nd including those reg rding the leg l v lidity of this contr ct nd this
rbitr tion cl use sh ll be settled out of court nd sh ll be referred to rbitr tion for fin l decision.
Any disputes between the purch ser nd R ytech AG Switzerl nd sh ll be settled ccording to the
rules of settlement nd rbitr tion of the ch mber of commerce in Zurich by one or more rbitr tors
ppointed lso ccording to the rules of rbitr tion of the ch mber of commerce in Zurich
Switzerl nd.
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INFO:
INFO:
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.

2 Safety Precautions
The following s fety prec utions must be observed during ll ph ses of oper tion, service nd
rep ir of this instrument. By purch sing this equipment the purch ser ssumes ll li bility for the
oper tion nd use of this equipment. The intended use of the instrument, its design nd
m nuf cture, is to be conducted within the prec utions or other specific w rnings loc ted within
this m nu l. F ilure to comply with these prec utions nd other specific w rnings viol tes the
s fety st nd rds of design, m nuf cture, nd intended use. R ytech ssumes no li bility for the
oper tion nd use of this equipment.
2.1 Safe operation
Only qu lified, knowledge ble persons should be permitted to or ttempt to oper te this test
equipment. All test personnel should fully f mili rize themselves with the correct pplic tion nd
oper tion of this nd ll test equipment prior to oper tion. Persons directly nd indirectly eng ged
in the oper tion of this test equipment should keep cle r of ll high volt ge pp r tus while
conducting tests nd me surements.
2.2 Keep away from live circuits
Oper ting personnel must not remove instrument covers. Component repl cement nd intern l
rep irs must be m de by qu lified service personnel. Do not repl ce components or service this
instrument with the power c ble connected. To void injuries, lw ys disch rge circuits, disconnect
power nd remove extern l volt ge sources before touching components.
2.3 Do not operate in an expolive atmosphere
Do not oper te the instrument in the presence of fl mm ble g ses or fumes.
2.4 Do not subsitute parts or mo ify Instrument
Bec use of the d nger of introducing ddition l h z rds, do not inst ll substitute p rts or perform
ny un uthorized modific tion to the instrument. Return the instrument to R ytech service
dep rtment for service to ensure proper oper tion nd th t s fety fe tures re m int ined.
Instruments, which ppe r d m ged or defective, should be m de inoper tive nd secured g inst
unintended oper tion until they c n be rep ired by qu lified service personnel.
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WARNING !
WARNING !
Never connect the instrument to n energized Test Object!

2.5 Before applying power
Re d this m nu l c refully before oper ting the system.
The Micro Junior 2 is line oper ted. It oper tes within wide r nge of power input from 100V c to
250V c nd The system is designed to be used with either 50Hz or 60Hz
Do not v ry the input power source volt ge level when v ri ble AC power source is connected.
2.6 Groun the Instrument
To minimize shock h z rd, the Ground Termin l on the instrument must be properly connected to
n E rth grounded point. In m ny c ses, the qu lity of the s fety ground termin l provided by the
power cord does not fulfill the s fety requirements.
Also the power cord supplied with the equipment must be connected to n electric l recept cle
with n electric l ground (s fety e rth ground).
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3 Unpacking
The Micro Junior 2 consists of the following items:
The Instrument Test Le d Power Current 2x3m Test Le d Potenti l 2x3m
C ble B g Power Cord, Ch rger User M nu l
If ny of the bove items re missing or d m ged, cont ct your loc l represent tive or R ytech AG
Switzerl nd immedi tely.
3.1 Optional Items
Temper ture Probe Kelvin Probe Set (MJO-201) P per rolls
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4 Technical Specifactions
The Micro Junior 2 is speci lly designed for f st nd e sy field me surement with the well known
high precision nd qu lity of R ytech.
Type
Size
Weight
Ext. Power Unit
B ttery
Test Current
P nel Displ y
Front P nel
Interf ce
Printer
Memory Stor ge
Micro Junior 2
L: 410 mm (16.1”) W: 337 mm (13.3”) H: 178 mm (7”)
6.3 kg (13.88 lbs.)
100 to 250 VAC 50 / 60 Hz, utom tic r nging
Li-Ion b ttery p ck, 14.8V / 6Ah
User Select ble: 10, 1, 0.1, 0.01, 0.001 Ampere
LCD Gr phic with b ck lighting
Se led nodized with multi- ctu tion rot ry knob
9 Pin RS232 seri l
Inern l p nel mount printer
Intern lly stores up to 2000 complete test results
Oper ting Temper ture
Stor ge Temper ture
-10°C to 60°C
-20°C to 70°C
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INFO:
INFO:
The Micro Junior 2 Fieldc se is w terproof design with pressure relief
v lve. This v lve should be slightly open when encountering tmospheric
ch nges; i.e... Airpl ne Tr vel, High ltitudes, etc... Close the v lve when
tr nsporting the equipment in wet conditions.

5 Quick Start Gui e
5.1 Operation
This section describes typic l, step by step, oper tion of the Micro Junior 2
Open the top protection lid of the c se nd tt ch the test le ds to the test set.
The Two (2) connections on the front pl te m rked +I & -I re the current le ds.
The Two (2) connections on the front pl te m rked +P & -P re the Potenti l or Volt ge le ds.
By connecting test specimen to the Current le ds nd pplying the potenti l le ds ( See figure )
cross the specimen the resist nce re dings will be determined.
Turn the Power switch to the “ON” position.
The Instrument will m ke the initi l
c libr tion check. Then the Initi l R nge
selection screen will ppe r.
Select the current or resist nce r nge
expected to be me sured with the rot ry
knob.
(Selecting the cross current, X10A & X1A me surement r nge.)
Press the rot ry knob when the indic tor is pointing t the resist nce nd current level to be
me sured (If unsure of current level, then st rt t the 1 mA r nge nd incre se the current r nge
until v lid re ding ppe rs).
After the current r nge is selected press the rot ry knob g in. The following me suring modes
c n then be ccessed: Single, Cont... (Continuous), Auto (Autom tic), Inter... /Interv l).
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WARNING !
WARNING !
Before Oper ting this or ny other test equipment, re d ll s fety w rnings
nd underst nd them fully

5.2 Single
The "Single" mode llows single test to be m de. Turn the rot ry knob until “Single” is
highlighted. Press the rot ry knob to select. The test set will st rt me suring sequence
immedi tely. The system will sense the current output, nd if v lid re ding is detected, then
record the results on the displ y. The results c n then be “Stored” or “Printed”.
5.3 Cont...(Continuous)
The "Cont..." (Continuous) mode llows single test to be m de continuously. The instrument will
continuously me sure until the oper tor presses “Stop”.
Turn the rot ry knob until “Cont” is highlighted. Press the rot ry knob to select. The test set will
st rt me suring immedi tely. The system will sense the current output nd, if it is v lid re ding,
displ y the results on the displ y. If the STOP button is selected the l st v lid re ding displ yed will
rem in on the displ y.
5.4 Auto (Automatic)
The "Auto" (Autom tic) mode will me sure nd store, utom tic lly, numerous single sequenti l
tests. The instrument will continuously me sure multiple tests until the oper tor selects nd
presses “Stop”.
For this type of me surement, ple se use the option l Kelvin probes.
Turn the rot ry knob until “Auto” is highlighted. Press the rot ry knob to select.
The test set will st rt me suring immedi tely nd prompt the oper tor to m ke Cont ct with the
test probes. The system will sense the current output, nd if it is v lid re ding, then displ y the
results on the displ y. The instrument will utom tic lly s ve this l st result in memory loc tion
nd then prompt the oper tor to remove the test probes (Remove Cont ct). The instrument will
then repe t the process. Press the STOP button to end the me suring sequence.
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NOTE:
NOTE:
The instrument will h lt the me suring process if excessive interference is
detected.
If w rning mess ge,”Rx Too High” is displ yed, Or if ”+++.+” is displ yed,
Then return to the “SET UP” screen nd select the next higher resist nce
r nge.

5.5 Cross Current measurements (Forwar / Reverse)
The Micro Junior 2 w s designed to llow me surements with the current flow in forw rd
direction nd then in reverse direction. The current flow through the device under test is reversed
(or crossed) utom tic lly during testing sequence in R nges X10 A nd X1 A.
When the test is initi ted the current flow is first positive (+) DC sourced then utom tic lly
switches current flow to neg tive (-) DC sourced. The potenti l le ds re not reversed.
Me surements re t ken from the (+) Positive me surement re dings nd me surements re
t ken from the (-) Neg tive me surement re dings. These re dings re then combined with the
result nt.
v lue of resist nce being very ccur te with resolution of 0.1 Ohm.
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6 Intro uction
Digit l Micro ohm meter, Micro Junior 2, w s designed for high degree of ccur cy for the
me surement of very low resist nce. This technology w s then p cked into port ble test system
for use by pp r tus m nuf cturers, rebuild shops, nd electric l m inten nce crews.
6.1 Ease of use
This intelligent system h s n e sy to use oper tion screen, which llows quick selection of the
current level nd resist nce level to be me sured. The system h s the bility to detect the
resist nce level nd suggest the correct r nge to select which provides for extremely ccur te
results.
6.2 Impressive accuracy
The Micro Junior 2 is high precision, fully utom tic, microprocessor b sed system. This system
is designed for highly ccur te re dings on-site with l bor tory precision.
6.3 Unique measuring technique
This newly designed technique of me surement incorpor tes high precision me surement circuit
which will utom tic lly me sure with current flow in one direction, then the system will reverse the
current flow nd displ y very ccur te results to 0.1. The system llows long term
me surements t 10 A without frequent rech rging
6.4 Operation
The Micro Junior 2 pplies preset current level, selected by the user. The results of the test re
displ yed within few seconds utom tic lly. The results re reported on the e sy to re d liquid
cryst l displ y.
6.5 Compact esign
The Micro Junior 2 is lightweight system th t comes complete with its own rugged w terproof
Fieldc se.
6.6 Simple maintenance
There is No m inten nce required. There is No c libr tion procedure (No potentiometers to turn).
This is due to the utiliz tion of high precision components in the design.
6.7 A vance protection
Upon powering on the system initi lizes itself with self-c libr ting, circuit checking sequence. If
ny problems re detected during this initi liz tion period, or during oper tion, the oper tor is
immedi tely notified. The system const ntly monitors the condition when turned on. The Micro
Junior 2 h s extensive protection built in to the circuitry. This is one of the m ny re sons we c n
extend our w rr nty to 2 ye rs.
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7 A vantages & Features
–Microprocessor b sed system
–Autom tic me surements of Low Resist nce
–Autom tic current revers l mode for gre ter ccur cy
–Intern l stor ge for 2000 test results
–Response time less th n 2 seconds
–Single push button oper tion
–Autom tic shut-off to extend b ttery life
–Lithium B ttery power source
–Runs for more th n 5 hours continuous t 10 A
–Complete utom tic c libr tion system
–He vy duty protection circuitry
–Intern l P nel Mount Printer
–Extern l connection Port & RS232 (seri l) Interf ce
–2 Ye r st nd rd w rr nty
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8 System Details
8.1 Battery check
The instrument is b ttery oper ted. Before oper ting the Micro Junior 2, check the b ttery indic tor
loc ted on the upper left h nd of the displ y. The B ttery indic tor will give good indic tion of the
b ttery ch rge. A full Ch rge will llow the Micro Junior 2 to oper te continuously for 5 Hours t 10-
mpere output or (typic lly) month of d ily us ge. Rech rge the b tteries t ny time. The
system c n be oper ted while ch rger is plugged into the m ins power (100 to 250 VAC 50 / 60
Hz, utom tic r nging).
8.2 Li-Ion Charger
Ext. power Unit 100 to 250 VAC 50/60 Hz, utom tic r nging.
8.2.1 Precautions
•This ch rger is for indoor use only. Do not expose to w ter or dust.
•To void overhe ting, the ch rger must not be covered while in use.
•This ch rger is designed for use with Lithium-Ion B tteries inst lled in the
R ytech Micro Junior 2 only.
•The m ins outlet must be e sily ccessible. Should f ulty Condition occur: remove the
plug from the m ins outlet immedi tely.
8.2.2 Features
•3-step ch rge control for s fe, f st ch rging of Lithium-Ion B tteries.
•One volt ge level: Quick bulk ch rge.
•LED-indic tor with three different colors show the ch rge st tus.
•Built in timer for prolonged ch rging.
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HIGH VOLTAGE !
HIGH VOLTAGE !
Do not remove cover! There re no user service ble components inside.

8.2.3 Charging Instructions
1. Connect the ch rger to the Micro Junior 2 before it is connected to the m ins outlet.
2. When ch rging is complete, disconnect from the m ins before removing connections.
8.2.4 Explanation of Charging Function
The Extern l Ch rger works in three different modes. An LED-indic tor with three different colors
shows the mode th t the ch rger is in.
LED Indic tor Ch rge St tus:
Bulk Ch rge Or nge LED. B ttery < 95% C p city.
The ch rger is in const nt current mode. Ch rge current is m ximum.
B l ncing Ch rge Yellow LED. B ttery > 95% C p city.
The ch rger is in timer/trickle mode. Ch rge current is less th n m ximum.
St ndby mode Green LED. B ttery t full C p city.
The ch rge is stopped. Ch rge current is zero.
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WARNING !
WARNING !
The ch rger h s n intern l slow blow gl ss fuse which will blow if f ult
occurs in the ch rger.
Unit must be rep ired by qu lified service personnel only.

8.3 Limitations of Resistance Testing
This Test system is c p ble of sourcing 10 A t 0.9 VDC. The c ble le ds th t c rry the test current
should h ve tot l resist nce not exceeding 40 m. Beyond the 40 m the test set decre ses the
v il ble output current. A w rning mess ge,”Use 1 A r nge” will be displ yed. However, the
system will continue to me sure nd displ y slightly less ccur te results. If the mess ge, ”Rx Too
High” or ”+++.+” is viewed in the displ y, then m nd tory r nge switching must be complied with.
8.4 Transformer win ings
Use of ny micro ohm meter for high inductive winding resist nce is not recommended.
The inductive ch r cteristics of tr nsformer winding testing require long period to s tur te the
winding to get st ble re ding. In ddition, c re must be t ken when removing test le ds such th t
volt ge ch rge does not rem in on the winding. Leth l currents m y rem in nd might c use
person l injury nd d m ge to the instrument. Speci lized test sets with higher potenti l
compli nce volt ges nd current should be considered for winding resist nce me surements.
8.5 Low Resistance Testing
The Micro Junior 2 is n extremely useful device for checking Switch Cont cts, SF6 Switchge r,
Busb rs, Splices, Joints, Fuses, Bre ker cont cts, R ilbonds, nd Low inductive windings.
The Micro Junior 2 utilizes 4 wire me suring technique. The Two connections on the front pl te
m rked +I & -I re the current le ds. The Two connections on the front pl te m rked +P & -P re
the Potenti l sense or Volt ge me suring le ds.
By connecting test specimen to the Current le ds nd pplying the Potenti l le ds cross the
resist nce to be me sured. The points where the potenti l le ds re connected determine the
resist nce re ding.
The test set employs very simple principle of Ohm’s l w:
R=V
I
R = Resist nce, V = Volt ge, I = Current
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9 Front Panel Description
Power Switch
Turning the switch to the “ON” position
pplies power to the test set.
Turning the switch to the “OFF” position
turns off the instrument.
The switch def ults to the “Autom tic off”
position nd will utom tic lly turn off fter
being idle for cert in period.
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Lithium Ion Charger Input
Connect the ext. Power supply here.
Emergency Stop
Press to Stop ny me surement in
progress.
Turn clockwise to rele se
Groun
E rth Ground Termin l
Connect the e rth c ble here.
External
This port is used for n extern l connection
to the 50A/50V Tr nsformer Winding
Resist nce Power Supply Option: WR50-
1A.
This port c n lso be used with n option l
temper ture probe.
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Test Connections
+ I : Positive Current Connection
+ P : Positive Potenti l Connection
- P : Neg tive Potenti l Connection
- I : Neg tive Current Connection
Interface
Seri l RS232 Computer nd Extern l
Printer Connection.
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