Aemc instruments 6250 User Manual
MICRO-OHMMETER
6250
ENGLISH
User Manual
Statement of Compliance
Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments
certifies that this instrument has been calibrated
using standards and instruments traceable to
international standards.
We guarantee that at the time of shipping your
instrument has met its published specifications.
An NIST traceable certificate may be
requested at the time of purchase, or obtained
by returning the instrument to our repair and
calibration facility, for a nominal charge.
The recommended calibration interval for this
instrument is 12 months and begins on the date of
receipt by the customer. For recalibration, please
use our calibration services. Refer to our repair
and calibration section at www.aemc.com.
Serial #: ________________________________
Catalog #: 2129.81
Model #: 6250
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC® Instruments
www.aemc.com
READ CAREFULLY BEFORE
USING FOR THE FIRST TIME
Your instrument is equipped with a NiMH battery. This technology oers several
advantages:
• Long battery charge life for a limited volume and weight.
• Possibility of quickly recharging your battery.
• Signicantly reduced memory eect: you can recharge your
battery even if it is not fully discharged.
• Respect for the environment: no pollutant materials such as lead
or cadmium, in compliance with the applicable regulations.
After prolonged storage, the battery may be completely discharged. If so, it must
be completely recharged.
Your instrument may not function during part of this recharging operation.
Full recharging of a completely discharged battery may take several hours.
NOTE: In this case, at least 5 charge/discharge cycles will be necessary
for your battery to recover 95% of its capacity.
To make the best possible use of your battery and extend its eective service life:
• Only use the charger supplied with your instrument. Use of
another charger may be dangerous.
• Only charge your instrument at temperatures between 0° and 40°C.
• Comply with the conditions of use dened in the operating manual.
• Comply with the storage conditions specied in the operating
manual.
NiMH technology allows a limited number of charge/discharge cycles depending
signicantly on:
• The conditions of use.
• The charging conditions.
Please refer to § 9 for correct replacement of the battery.
Do not dispose of the battery pack with other solid waste. Used batteries
must be entrusted to a qualied recycling company or to a company
specialized in processing hazardous materials.
Table of Contents
1. INTRODUCTION ................................................................................. 5
1.1 International Electrical Symbols ................................................6
1.2 Denition of Measurement Categories .....................................6
1.3 Receiving Your Shipment ..........................................................6
1.4 Ordering Information .................................................................7
1.4.1 Accessories and Replacement Parts ............................7
2. PRODUCT FEATURES ......................................................................... 8
2.1 Description ................................................................................8
2.2 Applications ..............................................................................9
2.3 Key Features ............................................................................9
2.4 Control Features .....................................................................10
2.5 Button Functions ..................................................................... 11
2.6 Display Symbols .....................................................................12
3. SPECIFICATIONS ............................................................................. 14
3.1 Electrical .................................................................................14
3.2 Mechanical ..............................................................................15
3.3 Display ....................................................................................15
3.4 Environmental .........................................................................16
3.5 Safety ......................................................................................16
4. OPERATION ..................................................................................... 17
4.1 Quick Summary ......................................................................17
4.2 Instrument Conguration (SET-UP Mode) .............................. 19
4.2.1 Program Menu Tree ....................................................19
4.2.2 Programming the 9-Pin Interface Port (rS) ................20
4.2.3 Setting the Buzzer Level (bUZZ) ................................21
4.2.4 Reading the Internal Serial Number (EdSn) ...............21
4.2.5 Reading the Internal Software Version (EdPP) ........... 21
4.2.6 Setting Language for Printing Reports (LAnG) ...........22
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Micro-Ohmmeter Model 6250
4.2.7 Setting the Value for Reference Temperature .............22
4.2.8 Selecting the Method/Value for Ambient Temp ...........23
4.2.9 Selecting the Metal Type (nEtA) .................................24
4.2.10 Programming the Alpha Value (ALPH) ........................24
4.2.11 Selecting Temperature Units (dEg) ............................. 24
4.2.12 Setting Alarm Set Point/Direction/Buzzer Level ..........25
4.2.13 Setting the Display Timeout (LlgH) .............................26
4.2.14 Clearing the Memory (nEn) .........................................26
4.3 Operating Procedure ..............................................................28
4.3.1 Connections and Readings .........................................28
4.3.2 Test Lead Connection ................................................. 29
4.3.3 Very Low Resistance ..................................................29
4.3.4 Meter Readings ..........................................................29
4.3.5 Stand-by (ST BY) State .............................................. 30
4.4 Selecting the Test Range ........................................................ 30
4.5 Measurement Modes ..............................................................31
4.5.1 Measurement Safety Warnings ...................................31
4.5.2 Inductive Resistance Measurement Mode ..................31
4.5.3 Resistance Measurement Mode .................................33
4.5.4 Low Inductive Resistance Measurement Mode ..........34
4.6 Ambient Temperature Compensation .....................................35
4.6.1 Activating the Compensation Function ......................38
4.7 Activating Alarms ....................................................................39
5. MEMORY / PRINTING ...................................................................... 40
5.1 Managing and Printing the Data in Memory .........................40
5.2
Displaying and Printing Stored Measurements ...............................41
5.3 Cables and Printers Used with the Interface Port ...................43
6. DATAVIEW® SOFTWARE ................................................................... 45
6.1 Installing DataView® ................................................................45
6.2 Connecting the Instrument to your Computer .........................49
6.3 Establishing Communication to the Instrument ......................49
6.4 Conguring the Instrument .....................................................50
6.5 Downloading Stored Tests ......................................................52
Micro-Ohmmeter Model 6250
3
6.6 Creating a DataView® Report .................................................52
6.7 Exporting the Report to a Spreadsheet or PDF File ..............53
7. TROUBLESHOOTING ........................................................................ 54
7.1 Fault Indicators .......................................................................54
8. APPLICATION EXAMPLES ................................................................ 55
8.1 Measuring Winding Resistance of Motors
and Transformers ....................................................................55
8.2 Measuring Resistance on Electric Motors ..............................56
8.3 Battery Strap Measurements ..................................................56
9. MAINTENANCE ................................................................................ 57
9.1 Warning...................................................................................57
9.2 Cleaning ..................................................................................57
9.3 Charging/Recharging the Battery ...........................................58
9.4 Battery and Fuse Replacement ..............................................59
Repair and Calibration ....................................................................60
Technical and Sales Assistance ......................................................60
Limited Warranty .............................................................................61
Warranty Repairs ............................................................................61
4
Micro-Ohmmeter Model 6250
CHAPTER 1
INTRODUCTION
WARNING
These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument.
• Do not attempt to perform any tests with this instrument until you
have read the user manual.
• Tests are to be carried out on de-energized circuits only! Never
connect the unit to a live circuit.
• When the unit is measuring resistance showing a high inductive
component (transformers, motors, etc.) after ending the measurement, the unit then discharges the inductive sample and the
warning icon
the connection wires before this icon disappears.
• The micro-ohmmeter should never be used in an explosive
environment (this includes poorly ventilated battery rooms and
enclosures).
appears for the entire duration. Never disconnect
• Make sure the internal battery is fully charged prior to testing. If the
instrument has been left unused for several months, recharge the
battery.
• We recommend recharging the micro-ohmmeter every month to
ensure a full battery charge when used.
• When replacing fuses, install only fuses which are direct replacements.
• If the case needs cleaning, do not use any alcohol or oil based
cleaners. Preferably use soapy water with a damp cloth or
sponge.
• The test leads and measuring wires must be in good condition and
should be changed if there is any evidence of deterioration (insulation split, burnt, etc.).
• Never exceed the safety values indicated in the specications.
Micro-Ohmmeter Model 6250
5
1.1 International Electrical Symbols
This symbol signifies that the instrument is protected by double or reinforced insulation.
CAUTION - Risk of Danger! Indicates a WARNING and that the operator must
refer to the user manual for instructions before operating the instrument in all
cases where this symbol is marked.
Important instructions to read and understand completely.
Important information to acknowledge.
Risk of electric shock. The voltage at the parts marked with this symbol may
be dangerous.
Compliance with the Low Voltage & Electromagnetic Compatibility European
directives (73/23/CEE & 89/336/CEE)
In the European Union, this product is subject to a separate collection system
for recycling electrical and electronic components In accordance with directive
WEEE 2002/96/EC
1.2 Definition of Measurement Categories
CAT II: For measurements performed on circuits directly connected to
the electrical distribution system. Examples are measurements
on household appliances or portable tools.
CAT III: For measurements performed in the building installation at
the distribution level such as on hardwired equipment in xed
installation and circuit breakers.
CAT IV: For measurements performed at the primary electrical supply
(<1000V) such as on primary overcurrent protection devices,
ripple control units, or meters.
1.3 Receiving Your Shipment
Upon receiving your shipment, make sure that the contents are consistent
with the packing list. Notify your distributor of any missing items. If the equip-
ment appears to be damaged, le a claim immediately with the carrier and
notify your distributor at once, giving a detailed description of any damage.
Save the damaged packing container to substantiate your claim.
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Micro-Ohmmeter Model 6250
1.4 Ordering Information
Micro-ohmmeter Model 6250 ............................................ Cat. #2129.81
Includes extra large tool bag, set of two 10ft Kelvin clips (10A - Hippo), one RS-232 DB9 F/F
6 ft null modem cable, RS-232 to USB adapter, US 115V power cord, quick reference guide,
one pad of measurement
supplied with product user manual and DataView® software.
1.4.1 Accessories and Replacement Parts
Kelvin clips (10A Hippo), 10 ft color-coded leads ................Cat. #1017.84
Kelvin clips (10A Hippo), 20 ft color-coded leads ................ Cat. #2118.70
Kelvin probes (1A), spring loaded, 10 ft color-coded leads
with banana plug terminations ............................................. Cat. #2118.73
Kelvin probes (1A), spring loaded, 20 ft color-coded leads
with banana plug terminations ............................................. Cat. #2118.74
Kelvin Probes Pistol Grip 10 ft (10A) Spring Loaded........... Cat. #2118.75
Kelvin Probes Pistol Grip 20 ft (10A) Spring Loaded........... Cat. #2118.76
Kelvin Probes 10 ft (10A) Spring Loaded ........................... Cat. #2118.77
Kelvin Probes 20 ft (10A) Spring Loaded ........................... Cat. #2118.78
Kelvin Clips 10 ft (1-10A) ..................................................... Cat. #2118.79
Kelvin Clips 20 ft (1-10A) ..................................................... Cat. #2118.80
Cable, PC RS-232, DB9 F/F 6 ft Null Modem Cable ........... Cat. #2119.45
Replacement Battery 6V, 8.5 Ah rechargeable NiMH
result forms, NiMH rechargeable 6V battery pack, and USB stick
.......... Cat. #2129.91
RTD temperature probe ....................................................... Cat. #2129.95
RTD temperature probe with 7 ft (2m) extension cable ....... Cat. #2129.96
Fuse, set of 3, 16A/250V, 1 1/4 x 1/4" (6.3x32mm)
fast blow ....................................................................................... Cat. #2129.98
Fuse, set of 10, 2A/250V, 3/4 x 3/16" (5x20mm) fast blow .. Cat. #2129.99
Extra large classic tool bag..................................................Cat. #2133.73
Inverter – 12VDC to 120VAC 200 Watt for vehicle use ......... Cat. #2135.43
115V Power Cord ................................................................Cat. #5000.14
Adapter – RS-232 to USB 2.0 .............................................Cat. #5000.60
Order Accessories and Replacement Parts Directly Online
Check our Storefront at www.aemc.com/store for availability
Micro-Ohmmeter Model 6250
7
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The Model 6250 Micro-ohmmeter is used to perform low resistance
measurements from 1μΩ to 2500Ω. There are seven ranges with test
currents from 1mA to 10A.
The front end of the micro-ohmmeter employs a four-wire Kelvin conguration, which eliminates test lead resistance for a measurement accuracy
of 0.05%. A built-in circuit lters out AC signals.
The Model 6250 Micro-ohmmeter is packaged in a sealed eld case well
suited for shop and eld use. Power is supplied by a long-life NiMH battery
pack with a built-in recharger (110/220V).
The large, easy-to-read liquid crystal display is 2.25 x 4.00". It displays
the value of resistance, metal type, reference and ambient temperatures
(if selected), alarm conditions (if selected), test current and range and test
mode (Resistive, Inductive or Auto).
For operator safety and instrument protection, the micro-ohmmeter is
fuse protected at the inputs. Two fuses, accessible behind the front panel,
protect against stored energy in inductive loads.
Enhanced internal circuitry protects against possible inductive kickback
when the current is shut o.
A built-in thermal switch protects the micro-ohmmeter against overheating
on the 10A range when in continuous use.
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Micro-Ohmmeter Model 6250
2.2 Applications
Some of the more popular and most frequent uses of the micro-ohmmeter
are in applications for:
•
Checking metallic coating resistance, especially in aeronautics
• Ground connections and continuity measurement
• Resistance measurements on motors and transformers
• Contact resistance measurements on breakers and switches
• Component measurement
• Electrical cable resistance measurement
• Mechanical bond tests
• Wire to terminal connections
• Aircraft and rail bonds
• Many other very low resistance samples
2.3 Key Features
• Measures from 1µΩ to 2500Ω
• Test current selection from 1mA to 10A
• RTD temperature measurement (optional)
• Automatic or manual temperature compensation
• Two programmable alarms with high or low triggering
• Stores up to 1500 test results
• Selectable Inductive or Resistive test modes
• Operator safety by automatic discharge of residual charge on the
equipment under test
• Instantaneous, continuous or multiple test operation
• Selectable metal type (Copper, Aluminum or other) for
temperature compensation
• Internal, rechargeable batteries conduct up to 5000, 10A tests
• A built-in battery pack recharger recharges the batteries by
connecting to the AC line (90V/264V, 45Hz/420Hz) using a
standard line cord
• 4-Wire measurement with automatic compensation of
undesirable voltages and lead resistance
• Large multi-function backlit display
• Direct display of the measurement with its units, range, measure-
ment mode and, if activated, temperature compensation.
• Measurement can be initiated from the front panel or remotely
through the 9-pin communication port
• Rugged, sealed case
Micro-Ohmmeter Model 6250
9
2.4 Control Features
32
1
8
Figure 2-1
54
6
7
1. Kelvin input terminals
2. AC line recharging receptacle
3. Large multi-line backlit liquid crystal display
4. RTD temperature input
5. Communication / remote operation port
6. Range selection switch
7. Test, Start/Stop button
8. Eight program / function buttons
10
Micro-Ohmmeter Model 6250
2.5 Button Functions
PRINT
PRINT
MEM
ALARM
METAL
MEM
MR
In SET-UP mode, selects a function or increments a flashing parameter.
In SET-UP mode, selects a function or decrements a flashing parameter
In SET-UP mode, accesses the function to be modified.
In Wrap-Around mode, selects the parameter to be modified (from left to
right)
In SET-UP mode, shifts the decimal point and selects the unit.
Activates the secondary function of a button. The symbol appears on
the left side of the display.
Immediate printing of the measurement to a serial printer. If the temperature
compensation function has been activated, the calculated result and the
temperatures involved are also printed.
Retrieves stored data for printing (this function is independent of the setting
of the switch) except in the OFF and SET-UP positions.
Activates or deactivates the temperature compensation function to calculate the resistance measured at a temperature other than ambient measurement temperature.
Activates or deactivates the alarms. High or low triggering values are
adjusted in SET-UP.
Selects the desired measurement mode prior to starting one of the following measurements: Inductive mode (continuous test), non-inductive mode
(instantaneous test) or non-inductive mode with automatic triggering (multiple tests).
Selects the metal type for the temperature compensation calculation: Cu,
Al, or Other metal.
Stores the measurement at an address identified by an object number
(OBJ) and a test number (TEST).
Two presses on this button are required, one to select the location (use
the ▲ and ► buttons to change the location) and another to store the
measurement.
Retrieves stored data (this function is independent of the selector setting
of the switch) except for the OFF and SET-UP positions. Data is viewed
using the ▲ and ► buttons. The , and ALARM buttons can
be used.
Turns the display backlight ON or OFF.
Activates or deactivates the buzzer and adjusts the sound level.
Micro-Ohmmeter Model 6250
11
2.6 Display Symbols
The display incorporates two lines of characters to display test results, as
well as a library of symbols to assist the operator in determining conditions
at a glance. The symbols that can appear are shown in Figure 2-2 and are
detailed here.
Figure 2-2
Buzzer ON
Battery condition
Temperature compensation ON
Cu
Al
Other metal
ALARM 1 ▲
ALARM 1 ▼
ALARM 2 ▲
ALARM 2 ▼
OBJ.
TEST
°C / °F
PRINT
MEM
12
Micro-Ohmmeter Model 6250
Copper metal type selected
Aluminium metal type selected
User defined metal type selected
Communication port active
Alarm 1 active with high set point
Alarm 1 active with low set point
Alarm 2 active with high set point
Alarm 2 active with low set point
First position locator for data stored in memory
Second position locator for data stored in memory
Temperature displayed in either degrees Centigrade or Fahrenheit
Printing current test result or tests stored in memory
Displayed measurement about to be stored in memory
REMOTE
Instrument under computer control
MR
mV mΩ
AUTO
ST BY
OPER
2500Ω 1mA
250Ω 10mA
25Ω 100mA
2500mΩ 1A
Memory recall
Memory utilization indicator
Units of measure
Resistive material test mode selected
Inductive material test mode selected
Repetitive test mode selected
System idle ready to start a test
Test in process
Second function of a button activated
CAUTION! Refer to the user manual before using the instrument.
2500 ohm, 1 milliamp test range selected
250 ohm, 10 milliamp test range selected
25 ohm, 100 milliamp test range selected
2500 milliohm, 1 Amp test range selected
250mΩ 10A
25mΩ 10A
5mΩ 10A
Micro-Ohmmeter Model 6250
250 milliohm, 10 Amp test range selected
25 milliohm, 10 Amp test range selected
5 milliohm, 10 Amp test range selected
13
CHAPTER 3
SPECIFICATIONS
3.1 Electrical
Specications are given for an ambient temperature of 23°C ± 5°, relative humidity
of 45 to 75% and a supply voltage of 6V ± 0.1V.
Measurement Method:
4-Wire Kelvin resistance measurement with compensation for stray/residual voltages
Measurement Ranges:
Range Resolution
5mΩ 0.1µΩ 0.15% ± 1.0µΩ 10A 50mV
25mΩ 1µΩ 0.05% ± 3µΩ 10A 250mV
250mΩ 10µΩ 0.05% ± 30µΩ 10A 2500mV
2500mΩ 0.1mΩ 0.05% ± 0.3mΩ 1A 2500mV
25Ω 1mΩ 0.05% ± 3mΩ 100mA 2500mV
250Ω 10mΩ 0.05% ± 30mΩ 10mA 2500mV
2500Ω 100mΩ 0.05% ± 300mΩ 1mA 2500mV
Accuracy over 1 year
23°C ± 5°C
Measurement
Current
Temperature Measurement: 3-wire 100Ω Platinum RTD
Accuracy: ± 0.5°C
Resolution: 0.1°C
Inuence From Environment Conditions:
Temperature: 0.1% per 10°C typical, 0.25% max
Humidity: 0.5% max from 10 to 90%
Battery Voltage: ± 0.1% from 4.5 to 7.5V
Open Circuit Voltage: 7VDC max
Voltage
Drop
14
Micro-Ohmmeter Model 6250
Operating Voltage: 5 to 6VDC
Power Source:
Rechargeable 6V, 8.5 Ah NiMH battery pack
Built-in 90 to 256V (45 to 420Hz) charger
Battery Life: 5000, 10A tests (typical)
Battery Charging: 120/240VAC ± 20% (45 to 400Hz) line voltage
Auto-Power O: when battery voltage <5.0V
Low Battery Indication: The
needs to be recharged
Overload Input Protection: 250Vrms
Fuses:
F1 - 1 1/4 x 1/4" (6.3x32mm), fast acting, 16A/250V current source
protection
F2 - 3/4 x 3/16" (5x20mm), fast acting, 2A/250V charging circuit
protection
symbol is displayed when the battery
3.2 Mechanical
Dimensions: 10.63 x 9.84 x 7.09" (270 x 250 x 180mm)
Weight: 8.1 lbs (3.69kg approx) without leads
Case Protection: ABS plastic polycarbonate: watertight to IP64 (cover
closed), water resistant to IP53 (cover open).
Color: Safety yellow case with gray faceplate
3.3 Display
Blue Electroluminescent backlit Liquid Crystal Display (LCD), 2.25 x 4.00"
with icons and two numeric elds for data presentation.
One numeric eld contains 4 digits for displaying ambient and reference
temperature levels on the top line in “temperature compensation” mode.
The other contains 5 digits and is used to display the measured values on
the bottom line. Error messages are also listed on the bottom line.
Micro-Ohmmeter Model 6250
15
3.4 Environmental
Operating Temperature:
14° to 132°F (-10° to 55°C), 10 to 80% (non-condensing)
Storage Temperature: -40° to 140°F (-40° to 60°C)
3.5 Safety
EN 61010-1, 50V, CAT III, Pollution Degree 2
Conducted and radiated emission:
EN 55022, class B
EN 61000-3-2
EN 61000-3-3
Immunity:
EN 61000-4-2 electrostatic discharges
EN 61000-4-3 radiated elds
EN 61000-4-5 shock
EN 61000-4-6 conducted disturbances
EN 61000-4-11 voltage drops
EN 61000-4-4 bursts
*Specications are subject to change without notice
16
Micro-Ohmmeter Model 6250
CHAPTER 4
OPERATION
NOTE: Charge the instrument fully before use.
4.1 Quick Summary
The following is a summary instruction set that will assist the operator in
performing measurements. For complete details on each function and test
method refer to the operating procedure section (§ 4.3) and instrument
conguration section (§ 4.2) in this manual.
WARNING: Read and follow all safety warnings on page 4 before operating this instrument.
1. Turn the instrument on and select a test range by turning the rotary
switch to the desired position. If the resistance of the device under test
is unknown, start with the highest range (2500Ω) and work down to
increase resolution as necessary.
2. Select the test method best suited for the measurement by press-
ing the button to select inductive (continuous test), resistive
(instantaneous test) or AUTO (multiple testing).
3. Activate the backlight, if necessary, by pressing the button.
4. Activate the buzzer, if desired, by pressing yellow button followed
by the button.
5.
Activate alarms, if desired, by pressing the yellow button followed
by the ALARM button. Successive presses of this two-button sequence
will select Alarm 1, Alarm 2 or both.
6. Select the metal type for the device under test by pressing the yellow
button followed by the METAL button. Successive presses of this
two-button sequence will select Copper (Cu), Aluminum (Al) or Other
metal. This will be needed for temperature compensation.
Micro-Ohmmeter Model 6250
17
7. Activate temperature compensation by pressing the button.
Temperature
A
Test current
Resistance measurement
Inductive test mode
The reference temperature will appear followed by the ambient
temperature on the top line of the display.
8. Start the test by pressing the START/STOP button. The resistance
reading will appear on the lower line of the display. The symbol
OPER will appear on the lower left to indicate that a test is in
process. The Stand-by symbol STBY will appear when the test is
completed. Resistive element tests will stop automatically. Inductive
and AUTO testing will stop when the operator pushes the START/
STOP button a second time.
9. Store the test result in memory by pressing the MEM button at the
conclusion of a test. The next available location will be presented on
the top line of the display. To use this location, press the MEM button
a second time.
10.
Recall readings from memory by pressing the yellow button followed by the MEM button. The last measurement stored in location
OBJ: X TEST: X will be displayed. Use the ▲, ▼ and ► buttons to
select the object and test memory location to review. All information
from the measurement is available for review including metal type,
ambient and reference temperatures, resistance at ambient and reference temperatures, test range and test current.
Typical Operational Display
compensation active
Buzzer active
larm 1 hi set point active
Measurement range
Figure 4-1
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Micro-Ohmmeter Model 6250
Metal type (Copper)
Reference temperature
Measurement units
Test in process
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