Mostec VG-BAT Series User manual
Portable Micro-Ohmmeter
VG-BAT-x00
OPERATING MANUAL
Operating manual VG-BAT
Page 2
Warranty
Mostec warrants this product to be free of manufacturing defects for a 2-year period after the
original date of purchase. Within this period, defective products will be repaired free of charge
provided that the defect occurred during normal operation. This warranty does not cover damage to
the product resulting from ordinary usage such as front panel scratches, broken control elements
and corrosion, etc. The customer is responsible for shipping and packing charges for products
returned under warranty to Mostec. Mostec warrants this product beyond the 2-year warranty
period for an additional 2 years in case of long term damages due to improper manufacturing.
Such damages as poorly soldered joints or other assembly problems are also covered by the
warranty. Transportation damages are not covered by the warranty and should be referred to the
respective delivery service.
Technical data
The portable micro-ohmmeters VG-BAT-x00 are used for resistance measurements of high
power switches etc. The strengths of the instruments are the easy handling, battery powered,
rugged design and low weight.
The VG-BAT-x00 enables a real direct current measurement for highest accuracy. The current
rises linear for 1 second than holds the preset current for 3 seconds and falls back within another 1
second.
The advanced build-in LiFePO4 battery offers maximum power with excellent safety and
outstanding life.
The 4.3" LCD graphic display, enables measurements in darkness, coldness and full sunlight.
Measurement data is saved directly to a USB stick and to the internal Memory.
The USB PC-Interface is used to control the device or read out the results automatically by
computer.
Read out the device history or start a measurement with an Android phone or tablet. Send the data
directly to your office.
The VG-BAT-200, with a weight of 5.2kg only, is very handy and easy transportable.
Typical applications are ohmic tests of:
Circuit breakers
Disconnecting switches
High current busbar joints
Railway parts
Cable splices
Welding joints
Ground connections
Operating manual VG-BAT
Page 3
Index Page
1. Safety Regulations ..................................................................................................................................... 4
2. Battery care ................................................................................................................................................ 5
3. Battery disposal.......................................................................................................................................... 5
4. Operating Instructions ................................................................................................................................ 5
5. Control Panel ............................................................................................................................................. 6
6. Power ON ................................................................................................................................................... 7
7. Main Menu ................................................................................................................................................. 7
8. System Menu ............................................................................................................................................. 8
9. System Menu, Description ......................................................................................................................... 9
10. Result Window ......................................................................................................................................... 12
11. Start/Stop Measurement .......................................................................................................................... 12
12. Printer ....................................................................................................................................................... 12
13. Error Messages ........................................................................................................................................ 13
14. Instrument Temperature Monitoring ........................................................................................................ 13
15. Application Example - one side grounded ............................................................................................... 14
16. Application Example - both sides grounded ............................................................................................ 15
17. Verify the measuring current .................................................................................................................... 16
18. Verify the measuring function .................................................................................................................. 16
19. Technical Data ......................................................................................................................................... 17
20. Notes ........................................................................................................................................................ 18
Operating manual VG-BAT
Page 4
1. Safety Regulations
Always comply with local safety regulations when using the Micro-Ohmmeter.
Always connect protective earth (ground).
Read and comply with the safety regulations in this manual before using Micro-Ohmmeter.
Never open a breaker as long as the Micro-Ohmmeter is connected.
High voltage/currents can occur at the input/output clamps.
The connection joints of the high current cables may become hot during a test.
Do not subject the instrument to strong impact, mechanical shock or excessive heat.
Do not expose the instrument to water, salt water or other liquids.
This instrument contains a LiFePO4 high energy battery pack and a lithium coin cell.
Do not pierce, damage, disassemble or modify the battery
Testing inductive circuits can be hazardous. The VG-BAT-x00 is a high power instrument,
designed for testing resistive loads. It must not be used to test inductive loads.
Operating manual VG-BAT
Page 5
2. Battery care
The battery should be charged at a minimum of 6 month intervals. This is to prevent deep
discharge.
Never attempt to charge the battery below 0°C or above +40°C ambient.
The instrument is specified between -20°C and +50°C. However keep in mind that at very
low temperatures, the battery is stressed and the capacity of measurements is reduced.
Keeping the instrument at room temperatures before doing measurements outside at low
temperatures helps to improve battery life.
The battery is charged by connecting the provided recharger at the DC socket on the back
of the instrument.
If the recharger is connected the LED next to the ON/OFF key illuminates.
The battery charging time is 1.5 hours.
Store the instrument in a cool, dry location to improve battery life.
Storage temperatures below freezing should be avoided. Do not attempt to remove the
batteries from this unit.
3. Battery disposal
The crossed out wheeled bin symbol placed on the batteries is a reminder not to dispose
of them with general waste at the end of their life.
This product contains lithium ion batteries and a coin cell. They are located inside the
instrument. The Lithium ion coin cell can be safely removed by Mostec AG.
4. Operating Instructions
1. Keep the Micro-Ohmmeter switched off while making connections.
2. Ground one side of the test object.
3. Ground the Micro-Ohmmeter.
4. Connect the current cables to the test object.
5. Connect the two sense cables as close as possible to the test object.
6. Switch on the Micro-Ohmmeter.
7. The Micro-Ohmmeter powers up and shows the startup text on the display.
8. Select the desired measuring current with the "ADJUST" keys [+] and [-] or use a
preset current with the keys [F1], [F2] or [F3].
9. Start the measurement with [Start/Stop].
To change the instrument settings, see page 8.
Operating manual VG-BAT
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5. Control Panel
01. LCD 4.3" graphic display
02. Keys to control the menu functions
03. Increment/decrement keys for menus and values
04. Start/Stop keys with status LED
05. Remote control connector
06. Accessories connector
07. USB PC-Interface
08. Data logger / USB stick
09. Current clamp sense input
10. Raw signal shunt voltage terminals
11. Sense terminals
12. DC - current output
13. DC+ current output
14. Power switch with recharging LED
15. Ground terminal
Warning: Opening the instrument case voids the warranty.
Operating manual VG-BAT
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6. Power ON
After power up the display shows the welcome message for 3 seconds. After that, the display
shows the main menu.
7. Main Menu
Iset = The previously set measuring current. The measuring current can be changed by
using the [+] and [-] keys.
Menu = Pressing [Ent], the user enters the system menu.
Reslt = Pressing [Esc], the user enters the window with the measuring results.
10 = Preselect value 1 of the measuring current. By pressing [F1], the measuring current
Iset is changed to 10A. This value can be changed in the system menu.
100 = Preselect value 2 of the measuring current. By pressing [F2], the measuring current
Iset is changed to 100A. This value can be changed in the system menu.
200 = Preselect value 3 of the measuring current. By pressing [F3], the measuring current
Iset is changed to 200A. This value can be changed in the system menu.
= State of charge
= Shows the numbers of remaining measurements for the actual load. On
startup the instrument takes the maximal load for calculation and adjusts
the value with further measurements.
Operating manual VG-BAT
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8. System Menu
Pressing [Ent] in the main menu leads to the system menu. In this menu, the user can navigate
between the items using the [F1] and [F2] key. Pressing [F3] switches between the first and
second page of the system menu. [Ent] selects the actual indicated item. The data of the
selected item can be modified using the keys [+] and [-]. To store the modified data and leave
the selected menu item, press the [Ent] key. [Esc] leaves the system menu without any
changes.
Operating manual VG-BAT
Page 9
9. System Menu, Description
First Page
Menu item
Description
Range of values
SM 0
Measure mode
(not available for battery types)
:
The measuring current flows continuously until it's
interrupted by the user. Single = the measuring current
only flows for a fixed given time.
single/continuous
SM 1
Current:
Preset current 1. The adjusted value appears in the main
menu above [F1].
5A to
205A
5A to 305A
5A to 405A
5A to 605A
SM 2
Current:
Preset current 2. The adjusted value appears in the main
menu above [F2].
5A to 205A
5A to 305A
5A to 405A
5A to 605A
SM 3
Current:
Preset current 3. The adjusted value appears in the main
menu above [F3].
5A to 205A
5A to 305A
5A to 405A
5A to 605A
SM 4
Current Clamp:
The instrument calculates the current which can be
bypassed through the grounding connections. This value is
subtracted from the measuring current which flows through
the device under test.
on/off
SM 5
Current Clamp:
Set the sensitivity of the external current clamp in mV/A.
0.10mV/A...20mV/A
SM 6
Temp. Compensation:
When this item is ON, the instrument works with the
temperature coefficient (α, see SM7). It measures the
temperature of the test object with the external
temperature sensor and compensates the temperature
coefficient of the test object.
on/off
SM 7
Temp. Compensation:
Set the value for the temperature coefficient (α) of the test
object that will be measured.
-/+ 9.99 x 10
-
3
1/K
SM 8
Erase measurements:
Erases all saved measurements.
yes/no
SM 9
Buzzer:
Activates key click and audio warning during measurement
and error messages.
on/off
Press [F3] for next page.
Operating manual VG-BAT
Page 10
Second Page
Menu item
Description
Range of values
SM
10
Time format:
Switches between 24/12h formats
12h/24h
SM 11
Date format:
Switches between different date formats.
YYMMDD, DDMMYY,
MMDDYY
SM 12
Time:
Adjusts the hour of the internal clock.
0…12 / 0…23
SM 13
Time:
Adjusts the minute of the internal clock.
0…59
SM 14
SM 15
SM 16
Date:
Adjusts year, month, day of internal calendar.
TT
1…31
MM 1…12
JJ 0…99
SM 17
Printer:
Incremental counter for the printout. The printouts are
numbered. The first number is set by item SM17.
0…9999
SM 18
Printer:
The user can switch the printout between simple
and detailed mode.
summary/all values
SM 19
Language:
Select the active language of the display.
English
Deutsch
Español
Swenska
Française
SM20
Display
Ueut:
Displays sense voltage
yes/no
SM21
Auto pol detection:
Disables automatic correction of sense polarity.
yes/no
SM22
Pass/Fail:
Enter submenu for changing limits by the [Ent] key. In
the submenu the limits for the measurement analysis
may be changed.
change limits
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