ENGLISH
INSTRUCTION MANUAL
Micro Junior 2
MICRO JUNIOR 2
RAYTECH AG , OBEREBENESTRASSE 11, CH-5620 BREMGARTEN, SWITZERLAND
Contents
1 Warranty Conditions 4
1.1 Limitation of Warranty.......................................................................................................... 4
1.2 Arbitration............................................................................................................................ 5
2 Safety Precautions 6
2.1 Safe operation..................................................................................................................... 6
2.2 Keep away from live circuits................................................................................................ 6
2.3 Do not operate in an expolive atmosphere..........................................................................6
2.4 Do not subsitute parts or modify Instrument........................................................................6
2.5 Before applying power......................................................................................................... 7
2.6 Ground the Instrument......................................................................................................... 7
3 Unpacking 8
3.1 Optional Items..................................................................................................................... 8
4 Technical Specifactions 9
5 Quick Start Guide 10
5.1 Operation........................................................................................................................... 10
5.2 Single................................................................................................................................. 11
5.3 Cont...(Continuous)............................................................................................................ 11
5.4 Auto (Automatic)................................................................................................................11
5.5 Cross Current measurements (Forward / Reverse)...........................................................12
6 Introduction 13
6.1 Ease of use....................................................................................................................... 13
6.2 Impressive accuracy.......................................................................................................... 13
6.3 Unique measuring technique............................................................................................. 13
6.4 Operation........................................................................................................................... 13
6.5 Compact design................................................................................................................. 13
6.6 Simple maintenance.......................................................................................................... 13
6.7 Advanced protection.......................................................................................................... 13
7 Advantages & Features 14
8 System Details 15
8.1 Battery check..................................................................................................................... 15
8.2 Li-Ion Charger.................................................................................................................... 15
8.2.1 Precautions.............................................................................................................. 15
8.2.2 Features.................................................................................................................. 15
8.2.3 Charging Instructions............................................................................................... 16
8.2.4 Explanation of Charging Function............................................................................16
8.3 Limitations of Resistance Testing.......................................................................................17
8.4 Transformer windings........................................................................................................ 17
8.5 Low Resistance Testing.....................................................................................................17
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9 Front Panel Description 18
9.1 Typical display screens......................................................................................................22
10 Operation Menu 23
10.1 Menu Structure................................................................................................................ 23
11 Main Menu 24
11.1 Range Selection Screen.................................................................................................. 24
11.2 Archive Screens...............................................................................................................24
11.2.1 Show...................................................................................................................... 24
11.2.2 Print.......................................................................................................................25
11.2.3 Erase..................................................................................................................... 25
11.3 Setup Menu Screens....................................................................................................... 25
11.3.1 Clock...................................................................................................................... 26
11.3.2 Interval Test............................................................................................................26
11.3.3 Contrast.................................................................................................................27
11.3.4 Printer....................................................................................................................27
11.3.5 Temperature Correction......................................................................................... 28
11.3.6 Length Correction (specific Resistance).................................................................30
12 Testing Screen Description 31
12.1 Range 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… (Interval)..................................................................................................... 34
12.2.5 Timer...................................................................................................................... 34
12.3 X10A / x1A (Forward / 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 Upgrades 43
C Contacts 44
D Index 45
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1 Warranty Conditions
Raytech AG Switzerland shall at their option and expense, repair or replace any part or parts that
prove to be defective within the warranty limitation period- irrespective of the operating time of the
test equipment provided that the cause of the defect occurred prior to the time at which the risk
was passed.
Warranty claims are subject to a warranty limitation period of 24 months from the date of shipment.
The purchaser is obligated to immediately notify Raytech AG Switzerland in writing of any defects
of the supplied test equipment.
Raytech AG Switzerland must always be given the opportunity to rectify a defect within a
reasonable amount of time. The purchaser shall grant an adequate amount of time that the test
equipment shall be repaired.
Raytech AG Switzerland covers the costs associated with the repair of the defect; especially the
costs for the material and work. Cost for sending the faulty test equipment shall be borne by the
purchaser. Raytech AG Switzerland shall not be liable for material damage, or financial loss due to
the loss of production, loss of data, loss of information, data or interest, regardless of their legal
basis.
Warranty claim rights on replacement parts as well as repair of defective parts shall expire after 12
months.
Warranty limitation period shall be extendable according to the price list. The purchaser has the
right to extend the warranty period by purchasing additional warranty years.
1.1 Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from:
• Improper and unauthorized modifications or misuse and abuse of the product, negligence,
alteration, modification, faulty installation by the customer, customer’s agents or
employees.
• Attempted or actual dismantling, disassembling, service or repair by any person, firm, or
corporation not specifically authorized in writing by Raytech GmbH Switzerland.
• Defects caused by or due to handling by carrier, or incurred during shipment, transshipment, or other move.
• Inadequate maintenance by the customer, second source supplied software or interfacing,
operation outside the environmental limits, or improper site preparation.
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Exclusive remedies provided herein are the customer’s sole and exclusive remedies.
Raytech Switzerland shall not be liable for any damages resulting from the use of this equipment
whether direct, indirect, special, incidental, or consequential damages, or whether based on
contract, tort, or any other legal theory.
1.2 Arbitration
All disputes arising out of or in connection with the contract between the purchaser and Raytech
GmbH Switzerland and including those regarding the legal validity of this contract and this
arbitration clause shall be settled out of court and shall be referred to arbitration for final decision.
Any disputes between the purchaser and Raytech AG Switzerland shall be settled according to the
rules of settlement and arbitration of the chamber of commerce in Zurich by one or more arbitrators
appointed also according to the rules of arbitration of the chamber of commerce in Zurich
Switzerland.
INFO:
INFO:
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.
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2 Safety Precautions
The following safety precautions must be observed during all phases of operation, service and
repair of this instrument. By purchasing this equipment the purchaser assumes all liability for the
operation and use of this equipment. The intended use of the instrument, its design and
manufacture, is to be conducted within the precautions or other specific warnings located within
this manual. Failure to comply with these precautions and other specific warnings violates the
safety standards of design, manufacture, and intended use. Raytech assumes no liability for the
operation and use of this equipment.
2.1 Safe operation
Only qualified, knowledgeable persons should be permitted to or attempt to operate this test
equipment. All test personnel should fully familiarize themselves with the correct application and
operation of this and all test equipment prior to operation. Persons directly and indirectly engaged
in the operation of this test equipment should keep clear of all high voltage apparatus while
conducting tests and measurements.
2.2 Keep away from live circuits
Operating personnel must not remove instrument covers. Component replacement and internal
repairs must be made by qualified service personnel. Do not replace components or service this
instrument with the power cable connected. To avoid injuries, always discharge circuits, disconnect
power and remove external voltage sources before touching components.
2.3 Do not operate in an expolive atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
2.4 Do not subsitute parts or modify Instrument
Because of the danger of introducing additional hazards, do not install substitute parts or perform
any unauthorized modification to the instrument. Return the instrument to a Raytech service
department for service to ensure proper operation and that safety features are maintained.
Instruments, which appear damaged or defective, should be made inoperative and secured against
unintended operation until they can be repaired by qualified service personnel.
WARNING !
WARNING !
Never connect the instrument to an energized Test Object!
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2.5 Before applying power
Read this manual carefully before operating the system.
The Micro Junior 2 is line operated. It operates within a wide range of power input from 100Vac to
250Vac and The system is designed to be used with either 50Hz or 60Hz
Do not vary the input power source voltage level when a variable AC power source is connected.
2.6 Ground the Instrument
To minimize shock hazard, the Ground Terminal on the instrument must be properly connected to
an Earth grounded point. In many cases, the quality of the safety ground terminal provided by the
power cord does not fulfill the safety requirements.
Also the power cord supplied with the equipment must be connected to an electrical receptacle
with an electrical ground (safety earth ground).
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3 Unpacking
The Micro Junior 2 consists of the following items:
The Instrument Test Lead Power Current 2x3m Test Lead Potential 2x3m
Cable Bag Power Cord, Charger User Manual
If any of the above items are missing or damaged, contact your local representative or Raytech AG
Switzerland immediately.
3.1 Optional Items
Temperature Probe Kelvin Probe Set (MJO-201) Paper rolls
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4 Technical Specifactions
The Micro Junior 2 is specially designed for fast and easy field measurement with the well known
high precision and quality of Raytech.
Type
Size
Weight
Ext. Power Unit
Battery
Test Current
Panel Display
Front Panel
Interface
Printer
Memory Storage
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, automatic ranging
Li-Ion battery pack, 14.8V / 6Ah
User Selectable: 10, 1, 0.1, 0.01, 0.001 Ampere
LCD Graphic with back lighting
Sealed anodized with a multi-actuation rotary knob
9 Pin RS232 serial
Inernal panel mount printer
Internally stores up to 2000 complete test results
Operating Temperature
Storage Temperature
-10°C to 60°C
-20°C to 70°C
INFO:
INFO:
The Micro Junior 2 Fieldcase is a waterproof design with a pressure relief
valve. This valve should be slightly open when encountering atmospheric
changes; i.e... Airplane Travel, High altitudes, etc... Close the valve when
transporting the equipment in wet conditions.
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5 Quick Start Guide
5.1 Operation
This section describes a typical, step by step, operation of the Micro Junior 2
Open the top protection lid of the case and attach the test leads to the test set.
The Two (2) connections on the front plate marked +I & -I are the current leads.
The Two (2) connections on the front plate marked +P & -P are the Potential or Voltage leads.
By connecting a test specimen to the Current leads and applying the potential leads ( See figure )
across the specimen the resistance readings will be determined.
Turn the Power switch to the “ON” position.
The Instrument will make the initial
calibration check. Then the Initial Range
selection screen will appear.
Select the current or resistance range
expected to be measured with the rotary
knob.
(Selecting the cross current, X10A & X1A measurement range.)
Press the rotary knob when the indicator is pointing at the resistance and current level to be
measured (If unsure of current level, then start at the 1 mA range and increase the current range
until a valid reading appears).
After the current range is selected press the rotary knob again. The following measuring modes
can then be accessed: Single, Cont... (Continuous), Auto (Automatic), Inter... /Interval).
WARNING !
WARNING !
Before Operating this or any other test equipment, read all safety warnings
and understand them fully
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5.2 Single
The "Single" mode allows a single test to be made. Turn the rotary knob until “Single” is
highlighted. Press the rotary knob to select. The test set will start a measuring sequence
immediately. The system will sense the current output, and if a valid reading is detected, then
record the results on the display. The results can then be “Stored” or “Printed”.
5.3 Cont...(Continuous)
The "Cont..." (Continuous) mode allows a single test to be made continuously. The instrument will
continuously measure until the operator presses “Stop”.
Turn the rotary knob until “Cont” is highlighted. Press the rotary knob to select. The test set will
start measuring immediately. The system will sense the current output and, if it is a valid reading,
display the results on the display. If the STOP button is selected the last valid reading displayed will
remain on the display.
5.4 Auto (Automatic)
The "Auto" (Automatic) mode will measure and store, automatically, numerous single sequential
tests. The instrument will continuously measure multiple tests until the operator selects and
presses “Stop”.
For this type of measurement, please use the optional Kelvin probes.
Turn the rotary knob until “Auto” is highlighted. Press the rotary knob to select.
The test set will start measuring immediately and prompt the operator to make Contact with the
test probes. The system will sense the current output, and if it is a valid reading, then display the
results on the display. The instrument will automatically save this last result in a memory location
and then prompt the operator to remove the test probes (Remove Contact). The instrument will
then repeat the process. Press the STOP button to end the measuring sequence.
NOTE:
NOTE:
The instrument will halt the measuring process if excessive interference is
detected.
If a warning message,”Rx Too High” is displayed, Or if ”+++.+” is displayed,
Then return to the “SET UP” screen and select the next higher resistance
range.
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5.5 Cross Current measurements (Forward / Reverse)
The Micro Junior 2 was designed to allow measurements with the current flow in a forward
direction and then in a reverse direction. The current flow through the device under test is reversed
(or crossed) automatically during a testing sequence in Ranges X10 A and X1 A.
When the test is initiated the current flow is first positive (+) DC sourced then automatically
switches current flow to negative (-) DC sourced. The potential leads are not reversed.
Measurements are taken from the (+) Positive measurement readings and measurements are
taken from the (-) Negative measurement readings. These readings are then combined with the
resultant.
value of resistance being very accurate with a resolution of 0.1 Ohm.
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6 Introduction
Digital Micro ohm meter, Micro Junior 2, was designed for high degree of accuracy for the
measurement of very low resistance. This technology was then packed into a portable test system
for use by apparatus manufacturers, rebuild shops, and electrical maintenance crews.
6.1 Ease of use
This intelligent system has an easy to use operation screen, which allows quick selection of the
current level and resistance level to be measured. The system has the ability to detect the
resistance level and suggest the correct range to select which provides for extremely accurate
results.
6.2 Impressive accuracy
The Micro Junior 2 is a high precision, fully automatic, microprocessor based system. This system
is designed for highly accurate readings on-site with laboratory precision.
6.3 Unique measuring technique
This newly designed technique of measurement incorporates a high precision measurement circuit
which will automatically measure with current flow in one direction, then the system will reverse the
current flow and display very accurate results to 0.1. The system allows long term
measurements at 10 A without frequent recharging
6.4 Operation
The Micro Junior 2 applies a preset current level, selected by the user. The results of the test are
displayed within a few seconds automatically. The results are reported on the easy to read liquid
crystal display.
6.5 Compact design
The Micro Junior 2 is a lightweight system that comes complete with its own rugged waterproof
Fieldcase.
6.6 Simple maintenance
There is No maintenance required. There is No calibration procedure (No potentiometers to turn).
This is due to the utilization of high precision components in the design.
6.7 Advanced protection
Upon powering on the system initializes itself with a self-calibrating, circuit checking sequence. If
any problems are detected during this initialization period, or during operation, the operator is
immediately notified. The system constantly monitors the condition when turned on. The Micro
Junior 2 has extensive protection built in to the circuitry. This is one of the many reasons we can
extend our warranty to 2 years.
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7 Advantages & Features
– Microprocessor based system
– Automatic measurements of Low Resistance
– Automatic current reversal mode for greater accuracy
– Internal storage for 2000 test results
– Response time less than 2 seconds
– Single push button operation
– Automatic shut-off to extend battery life
– Lithium Battery power source
– Runs for more than 5 hours continuous at 10 A
– Complete automatic calibration system
– Heavy duty protection circuitry
– Internal Panel Mount Printer
– External connection Port & RS232 (serial) Interface
– 2 Year standard warranty
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8 System Details
8.1 Battery check
The instrument is battery operated. Before operating the Micro Junior 2, check the battery indicator
located on the upper left hand of the display. The Battery indicator will give a good indication of the
battery charge. A full Charge will allow the Micro Junior 2 to operate continuously for 5 Hours at 10ampere output or (typically) a month of daily usage. Recharge the batteries at any time. The
system can be operated while charger is plugged into the mains power (100 to 250 VAC 50 / 60
Hz, automatic ranging).
8.2 Li-Ion Charger
Ext. power Unit 100 to 250 VAC 50/60 Hz, automatic ranging.
8.2.1 Precautions
• This charger is for indoor use only. Do not expose to water or dust.
• To avoid overheating, the charger must not be covered while in use.
• This charger is designed for use with Lithium-Ion Batteries installed in the
Raytech Micro Junior 2 only.
• The mains outlet must be easily accessible. Should a faulty Condition occur: remove the
plug from the mains outlet immediately.
8.2.2 Features
• 3-step charge control for safe, fast charging of Lithium-Ion Batteries.
• One voltage level: Quick bulk charge.
• LED-indicator with three different colors show the charge status.
• Built in timer for prolonged charging.
HIGH VOLTAGE !
HIGH VOLTAGE !
Do not remove cover! There are no user serviceable components inside.
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8.2.3 Charging Instructions
1. Connect the charger to the Micro Junior 2 before it is connected to the mains outlet.
2. When charging is complete, disconnect from the mains before removing connections.
8.2.4 Explanation of Charging Function
The External Charger works in three different modes. An LED-indicator with three different colors
shows the mode that the charger is in.
LED Indicator Charge Status:
Bulk Charge Orange LED. Battery < 95% Capacity.
The charger is in constant current mode. Charge current is maximum.
Balancing Charge Yellow LED. Battery > 95% Capacity.
The charger is in timer/trickle mode. Charge current is less than maximum.
Standby mode Green LED. Battery at full Capacity.
The charge is stopped. Charge current is zero.
WARNING !
WARNING !
The charger has an internal slow blow glass fuse which will blow if a fault
occurs in the charger.
Unit must be repaired by qualified service personnel only.
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8.3 Limitations of Resistance Testing
This Test system is capable of sourcing 10 A at 0.9 VDC. The cable leads that carry the test current
should have a total resistance not exceeding 40 m. Beyond the 40 m the test set decreases the
available output current. A warning message,”Use 1 A range” will be displayed. However, the
system will continue to measure and display slightly less accurate results. If the message, ”Rx Too
High” or ”+++.+” is viewed in the display, then mandatory range switching must be complied with.
8.4 Transformer windings
Use of any micro ohm meter for high inductive winding resistance is not recommended.
The inductive characteristics of transformer winding testing require a long period to saturate the
winding to get a stable reading. In addition, care must be taken when removing test leads such that
a voltage charge does not remain on the winding. Lethal currents may remain and might cause
personal injury and damage to the instrument. Specialized test sets with higher potential
compliance voltages and current should be considered for winding resistance measurements.
8.5 Low Resistance Testing
The Micro Junior 2 is an extremely useful device for checking Switch Contacts, SF6 Switchgear,
Busbars, Splices, Joints, Fuses, Breaker contacts, Railbonds, and Low inductive windings.
The Micro Junior 2 utilizes a 4 wire measuring technique. The Two connections on the front plate
marked +I & -I are the current leads. The Two connections on the front plate marked +P & -P are
the Potential sense or Voltage measuring leads.
By connecting a test specimen to the Current leads and applying the Potential leads across the
resistance to be measured. The points where the potential leads are connected determine the
resistance reading.
The test set employs a very simple principle of Ohm’s law:
R =
V
I
R = Resistance, V = Voltage, I = Current
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9 Front Panel Description
Power Switch
Turning the switch to the “ON” position
applies power to the test set.
Turning the switch to the “OFF” position
turns off the instrument.
The switch defaults to the “Automatic off”
position and will automatically turn off after
being idle for a certain period.
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Lithium Ion Charger Input
Connect the ext. Power supply here.
Emergency Stop
Press to Stop any measurement in
progress.
Turn clockwise to release
Ground
Earth Ground Terminal
Connect the earth cable here.
External
This port is used for an external connection
to the 50A/50V Transformer Winding
Resistance Power Supply Option: WR501A.
This port can also be used with an optional
temperature probe.
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Test Connections
+ I : Positive Current Connection
+ P : Positive Potential Connection
- P : Negative Potential Connection
- I : Negative Current Connection
Interface
Serial RS232 Computer and External
Printer Connection.
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Buttons
Rotary Encoder with Push-Button.
Printer
This panel mount printer allows the user to
print out stored results or current results.
The single button on the printer is for FormFeed.
To tear paper, pull paper towards the front
of the instrument against the serrated
cutting edge.
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9.1 Typical display screens
Start Up Current & Range Selection Archive Highlighted
Archive Memory Archive Show Menu Archive Erase Menu
Setup Highlighted Setup Menu Setup Clock
Setup Interval Test Setup Contrast Setup Printer
10A Range Test X 10A Range Reverse Test 10A Range Auto Test
Further details of these menus and screens are located on the following pages.
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10 Operation Menu
The instrument software is straight forward and easy to set up and operate. With a few key strokes
and selections on the test screen, measurements can be started. See chapter 5 Quick Start Guide
on page 10
10.1 Menu Structure
Micro Junior 2 menu structured as shown in the figure below.
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11 Main Menu
11.1 Range Selection Screen
Allows setting of Resistance & Current
levels.
Selection is made by turning the rotary
knob to the desired Current or Resistance
range then pressing the rotary knob to
confirm selection.
11.2 Archive Screens
This is where the memory locations are
kept.
In the "Range selection Screen", position
the pointer with the rotary knob to highlight
“Archive”.
Press the rotary knob to view the "Archive"
(memory locations) and this screen will
appear:
11.2.1 Show
This selection allows viewing of all of the
memory locations. Move the rotary knob to
scroll through stored tests.
If you want to print a measurement, you
must select it in this menu item.
Now Press the rotary knob and you get to
the previous menu.
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11.2.2 Print
This selection will print the highlighted
memory location.
Position the pointer with the rotary knob to
highlight “Setup” and return the "Range
Selection screen".
11.2.3 Erase
This selection will erase all of the memory
locations. Press “OK” to erase all of the
stored results.
If you do not wish to erase the stored
results, position the pointer with the rotary
knob to highlight “Stop” and press the
rotary knob to cease this action.
11.3 Setup Menu Screens
Includes selections for "Printer options",
"LCD Contrast", "Interval Test mode"
"Clock adjustments" "Temperature
Correction" and "Length Corection".
In the "Range Selection Screen", position
the pointer with the rotary knob to highlight
“Setup”.Press the rotary knob.
This screen will appear.
• Firmware (FW)
• Serial Number (SN)
• Flash Boot Loader (FBL)
• More: "Temperature Correction"
and"Length Correction"
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11.3.1 Clock
The time can be set by turning the rotary
knob and pressing the desired selection.
Selections are made in this order: Year,
Month, Day, Hour, and Minute.
Press the rotary knob while “Clock” is
highlighted.
This screen will appear.
You are now able to adjust the Year, Month,
Day, Hour, and Minute. Using the rotary
knob, turn clockwise or counter-clockwise
to change the highlighted number.
Press the rotary knob to proceed to the
next number.
11.3.2 Interval Test
The "Inter..." (Interval Testing) mode will
measure and store, automatically,
numerous single sequential tests at timed
intervals that are preset by the operator.
The test set measures continuously in this
mode.Press the rotary knob while “Inter...”
is highlighted to preselect a desired
measurement setup.
You are now able to adjust the Time
Interval. Use the rotary knob, turn
clockwise or counter-clockwise to enter the
desired time.Once the desired Time is
reached, press OK with the rotary knob.
• Ti = Time Interval of Tests
• N = Number of tests to be performed
The minimum amount of time is 5 seconds,
maximum of 10 minutes.
The following screen will appear.
You are now able to adjust the Number of
Tests. Use the rotary knob. Once the
desired number is reached, press the
rotary knob to select “OK”.
The minimum number of tests are 2,
maximum of tests 2000.
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11.3.3 Contrast
The Contrast (LCD) can be changed by
pressing and then turning the rotary knob
for the desired view.
While “LCD” is highlighted, press the rotary
knob.
The following screen will appear.
You are now able to adjust the contrast.
Use the rotary knob, turn clockwise or
counter-clockwise to adjust the brightness
or darkness of the screen.
By pressing the rotary knob, the setting is
confirmed.
11.3.4 Printer
This screen allows the user to select either
the Internal panel mount Printer or external
Serial Printer.
To change Printer setup, press the rotary
knob while “Printer” is highlighted.
This screen will appear.
• Internal: Default for the internal panel
mount printer.
• Serial: An external printer connected to
the 9 Pin RS 232 connector.
Use the rotary knob, turn clockwise or
counter-clockwise to select the desired
port. By pressing the rotary knob, the
setting is confirmed and you get back to the
previous menu.
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11.3.5 Temperature Correction
Temp: The Micro Junior 2 can, fully
automatic, correct the measured values
regarding the temperature.
To activate temperature correction, press
the rotary knob while “Temp” is highlighted.
This screen will appear. Use the rotary
knob, turn clockwise or counter-clockwise
to select the desired Material.
• NoCorr
• Copper Tk: 234.5°
• Alu Tk: 225.0°
• User : Press the rotary knob, turn
clockwise or counter-clockwise
to set the desired Temperature.
Once the desired Material is reached,
press OK with the rotary knob.
The following screen will appear.
Use the rotary knob, turn clockwise or
counter-clockwise to set the desired Ref.
Temperature T
Ref
.
Once the desired reference temperature is
set, press OK with the rotary knob.
The following screen will appear.
Connect the Optional temperature probe to
the External port, when T1 is selected.
If you dont have a Optional temperature
probe. Use the rotary knob, turn clockwise
or counter-clockwise to use EXT. Press the
rotary knob, and then turn clockwise or
counter-clockwise to set the desired
temperature you measure with your other
temperature probe.
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In this example, the measured object is
copper and will be corrected to 25 Degrees
Celsius based on the measured
(temperature probe) temperature.
The correction formula:
R
corr
= Rmeas
T
Ref
+Tk
T
Probe
+Tk
R
corr
Resistance corrected
R
meas
Measured resistance
T
Ref
Desired reference temperature
T
Probe
The temperature at which resistance was/is measured
Tk 234.5 for copper
225.0 for aluminium ( aluminium may be as high as 240)
Alternative: Correction with "a25" to calculate Tk with the formula:
Tk =
1
α
25
−25
When temperature correction is activated
the following screen will appear.
To deactivate the temperature correction go
to the Temp Menu.
Use the rotary knob, turn clockwise or
counter-clockwise to select NoCorr.
By pressing the rotary knob, the setting is
confirmed.
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11.3.6 Length Correction (specific Resistance)
/m:The Micro Junior 2 can, fully
automatic, correct the measured values
regarding the length.
To activate length correction, press the
rotary knob while “/m” is highlighted.
This screen will appear.
Use the rotary knob, turn clockwise or
counter-clockwise to select the desired
Unit. Once the desired Unit is reached,
press OK with the rotary knob.
• NoCorr; /m; /100m; / km; /ft;
/100ft; /1000ft
The following screen will appear.
Use the rotary knob, turn clockwise or
counter-clockwise to set the desired
Test-Length.
• The minimum Test-Length is 1mm,
maximum 20 000 m.
By pressing the rotary knob, the setting is
confirmed.
When Length Correction is activated the
following screen will appear.
To deactivate the Length Correction go to
the /m Menu.
Use the rotary knob, turn clockwise or
counter-clockwise to select OFF.
By pressing the rotary knob, the setting is
confirmed.
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12 Testing Screen Description
12.1 Range Selection
When the Micro Junior 2 is first powered on
the following "Range Selection" screen will
appear.
Test selections are initially made by turning
the rotary knob to the desired selection of
current or resistance range then pressing
the rotary knob to begin that sequence.
The following Ranges can be selected:
The resistance Ranges are a recommendations.
Current Range Resistance Range
10 A (F/R)
1 … 40 m
10 A
1 m … 40 m
1 A (F/R)
1 m … 1
1 A
10 m … 1
0.1 A
0.1 … 10
10 mA
1 … 400
1 mA
10 ... 400 k
NOTE:
NOTE:
For the descriptions of the various adjustments and options for testing, this
manual will use the 10A and x10A Ranges as examples on the following
pages.
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12.2 Testing
10A Screen
When the 10A range (or any other Range)
is selected, the following screen will appear
to allow the user to select the type of test
mode required:
Selection of “Single” starts a test sequence.
12.2.1 Single
The following screen will appear.
The system will conduct and run a single
test on a device. The test measurement
sequence completes within a few seconds.
The user has the option to:
• “GO” : Start another test.
• “Store” : allows to save a reading into a
Memory location (Archive).
• “Print” : allows to go to the print screen.
• “Mode” : Select another test mode.
• “Setup” allows to go to the Range
Selection screen.
12.2.2 Cont (Continuous)
Cont starts a continuous test sequence.
In the continuous test mode, the test set
will measure until the user selects and
presses “Stop”.
The test system has an output of current
that runs continuously while the resistance
measurements are being taken.
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The following screen will appear.
The user can Select “Store” or “Print” at
anytime that the system is measuring.
After the user Selects and presses “Stop”.
The test sequence will halt.
The user has the option to:
• “GO” : Start another test.
• “Store” : allows to save a reading into a
memory location (Archive).
• “Print” : allows to go to the print screen.
• “Mode” : Select another test mode.
• “Setup” allows to go to the Range
Selection screen.
12.2.3 Auto
Selection of “Auto” allows a number of tests
to be made then automatically.
The system automatically detects when
contact is made to the device under test
and begins and ends the measurement.
The data is automatically saved.
For this type of measurement, please use
the optional Kelvin probes.
The system prompts the operator to “Make
Contact ” to the device under test. The
system automatically detects when the
contact is made to the device under test
and begins the measurement sequence.
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After completion of the test the system
saves the results in memory then prompts
the operator to “Open Contact” to the
device.
Once the contacts have been removed
from the device under test it is then
detected by the system.
The system then prompts the operator to “Make Contact ” to the device again to repeat the process
of the next measurement sequence. The user can Select “Print” or "Stop" at anytime that the
system is measuring.
12.2.4 Inter… (Interval)
Selection of “Inter…” mode will measure
and store, automatically, numerous single
sequential tests at timed intervals that are
preset by the operator. The test set also
measures continuously in this mode.
In this mode, the instrument will
continuously measure multiple tests until
the operator selects and presses “Stop” or
until the number of tests that were preselected have been achieved.
The instrument will automatically save test
results in a memory location that will
increment by a timed interval.
Preselected variables are preset by the
operator in the "Setup" menu .
The test system indicates and counts down
the time between test results taken and
stored.
12.2.5 Timer
The "Timer" feature is typically used with
the transformer Winding Resistance option:
WR50-A1.
This feature allows the operator to record
the time required to prepare a heated
transformer winding (or any heated device)
for cooling curve measurements.
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12.3 X10A / x1A (Forward / Reverse test)
12.3.1 Single
X10 or X1 Ranges are for making measurements where the current is first positive (+) DC sourced
then negative (-) DC sourced. Basically, the current flow through the device under test is reversed
or crossed. The system measures in both positive and negative sourced modes then the resultant
resistance value is displayed. This can be very beneficial when testing in areas with high
background interference. This mode also offers the highest degree of resolution.
When the X10A range is selected, this
screen will appear.
Selection of “Single” starts a
Forward/Reverse test sequence.
Straight (+) DC Sourced
Then; Reversed (-) DC Sourced.
At the end of the test sequence the
following screen appears.
The user now has the option to:
• “GO” :Start another test.
• “Store” : allows to save a reading into a
memory location (Archive).
• “Print” : allows to go to the print
screen.
• “Mode”: Select another test mode.
• “Setup” : allows to go to the Range
Selection screen.
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12.3.2 Auto
Selection of “Auto” allows a series of tests
to be made then automatically saved to
memory.
For this type of measurement, please use
the optional Kelvin probes.
This mode operates identical to all other
test Ranges.
Press stop with the rotary knob. The test
will stop
12.4 Print
The Print mode is available after each test
sequence is run. Selection of “Print” allows
the user to print the test results that are
displayed on the screen. This screen will
appear when “Print” is selected:
• “Header” allows to Print a Header.
• “Data” allows to Print the data.
• “FF” allows to Form Feed the paper.
• “Stop” returns to the Test screen.
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12.5 Store
The Store mode is available after each test
sequence is run. Selection of “Store” allows
the user to store the previous test results
that are displayed on the screen to the
archive (Memory).
The numbered memory locations are
allocated sequentially. The saved data
consists of time stamp and date of test,
Current Range and Resistance value
resultant.
This screen will appear. In this example the
data was saved to memory location 12.
Press “Print” to print test results.
Press “Mode” to access other testing
modes.
Press “Setup” to go back to the Range
Selection screen
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13 Measurement Parameters
Current Range Measuring Range Accuracy Resolution
10 A (F/R)
0.00 … 40 m 0.1% Rdg 0.1 5 Digits or 0.01
10 A
0.0 … 40 m 0.1% Rdg 1 5 Digits or 0.1
1 A (F/R)
0.0 … 1 0.1% Rdg 1 5 Digits or 0.1
1 A
0.000 m … 1 0.1% Rdg 10 5 Digits or 0.001 m
0.1 A
0.00 m … 10 0.1% Rdg 0.1 m 5 Digits or 0.01 m
10 mA
0.0 m … 400 0.1% Rdg 1 m 5 Digits or 0.1 m
1 mA
0.0 … 40 k 0.1% Rdg 0.1 5 Digits or 0.1
1 mA
40 k ... 400 k 1% Rdg
4 Digits
F/R = automatic Forward / Reverse current measurement
Resistance Range
0.0 to 400k
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Appendix
90081-&90998-1.00 Raytech Vorlage Manual.ott2.11 Micro Junior 2
Micro Junior 2
MICRO JUNIOR 2
Page 39 of 44
Appendix
A Troubleshooting 41
A.1 System does not dislpay anything.................................................................................... 41
A.2 System powers on but the disply fades out or blinks........................................................ 41
A.3 Test Current cannot be Turned on....................................................................................41
A.4 Warning Rx too high or "+++.+" is dispayed.....................................................................41
A.5 The display Blacklight goes out frequently.......................................................................41
A.6 The test set Turns off more frequently..............................................................................42
A.7 The test set displays +++.+ but current is flowing.............................................................42
A.8 Erratic or erroneous readings........................................................................................... 42
B System Upgrades 43
C Contacts 44
D Index 45
90081-2.11 Micro Junior 2
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A Troubleshooting
At powering on, the Micro Junior 2 internal calibration and check sequence is performed.
Upon completion of the check sequence the test set will proceed to the “Range Selection“ Screen.
Should there be any problem with the test set an error message will appear.
A.1 System does not dislpay anything
1. Check the display for any Initialization.
2. Plug the test set into a main power outlet to check to see if the battery is completely
discharged.
3. Contrast is set too low.
A.2 System powers on but the display fades out or blinks
1. Check the battery charge.
A.3 Test Current cannot be Turned on
1. Does the unit have an external safety switch incorporated? Is it properly operating?
2. Is the system connected in an area with excessive interference?
A.4 Warning Rx too high or "+++.+" is dispayed
1. A warning message,”Rx Too High” or “+++.+” will be displayed if the resistance being
measured is too high for the range selected.
2. The current leads total resistance has exceeded the current capability of the instrument.
Reduce the current lead length or increase the wire gauge of the current lead used.
A.5 The display Blacklight goes out frequently
1. As the battery charge decrease the display backlight will go out more frequently to reserve
the battery power.
INFO:
INFO:
The Micro Junior 2 is digned to be trouble free
90081-2.11 Micro Junior 2
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A.6 The test set Turns off more frequently
1. As the battery charge decrease the test set will automatically turn off more frequently to
reserve the battery power.
A.7 The test set displays +++.+ but current is flowing
1. The test set is not reading any test voltage on the “+P” & “- P” leads.
2. The resistance value is beyond the limit of the selected range (Over Range).
A.8 Erratic or erroneous readings
Possible causes
1. Test lead damaged or not connected.
2. Poor test lead connection.
3. Test set attached to a “Live” load or high interference load.
The Micro Junior 2 is designed to be trouble free.
If problems or questions do arise please contact our service support group.
INFO:
INFO:
If problems or questions do arise please contact your nearest Dealer or our
service support group in the Switzerland under www.Raytech.ch
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B System Upgrades
System firmware upgrades are available at no charge from the web site www.raytech.ch.
This firmware is downloaded to a Windows based computer and then can be used to upgrade the
Flash EPROM in the Micro Junior 2 via the RS232 link. For further details or assistance please
contact our support group.
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C Contacts
Raytech Switzerland Your Local Representative
Raytech AG
Oberenbenestrasse 11
5620 Bremgarten
Phone:+41 56 648 6010
Fax: +41 56 648 6011
Mail: welcome@raytech.ch
Web: www.raytech.ch
Raytech AG
Oberenbenestrasse 11
5620 Bremgarten
Phone:+41 56 648 6010
Fax: +41 56 648 6011
Mail: welcome@raytech.ch
Web: www.raytech.ch
Release Date: 2019-04
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