SafeGuard MegaGuard Pro User manual

SG9265051
Reference manual

EC CONFORMITY
Unit SG9265051 conforms to EC directives EMC - 2014/30/EU , the
following harmonized standards are in use: EN 61000-6-1, EN 61000-6-3.
SAFETY INSTRUCTIONS
ATTENTION : this instrument generates a 100V measuring voltage on the
two measuring terminals or on the external probes if connected in the
“EXTERNAL PROBE” sockets.
Thecurrentislimitedto10mAandcannotmakeanyinjurytotheoperator.
For operator’s security, avoid to touch the electrodes directly.
WARRANTY
This unit is guaranteed against all defects due to faulty materials and
workmanship, within 12 months from the date of purchase.
A use not conforming to what specified might be dangerous to the safety of
the operator and may damage the instrument.
In such circumstances the manufacturer is relieved of any liability and the
warranty itself will decay.
REPAIR
Repairs have not been attempted by anyone other than authorized repair
distributors.
Do not try to repair the unit by yourself.
ATTENTION: Dangerous voltage is present inside the instrument.

TECHNICAL FEATURES
The MegaGuard Pro can measure surface resistance and resistance
to the ground of mats, floors and other objects of the EPA area,
and can also be used for point-to-point measurements.
The instrument displays up to a significant digit and is equipped with a
display graphic and programmable audible alarm.
Measuring range: from 104 to 1012Ω
Resolution: 1 significant digit
Accuracy: ± ½ decade
Graphic liquid crystal display 102x64 pixel, 34x23mm
Measuring voltage: . . . . . . . . 10Vdc for R<100kΩ−100Vdc for R>100kΩ
Dimensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80x120x27mm
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200g
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 V
LOW BATTERY = Blinking
Auto Shut-off after 5 minutes of inoperativity.
PROBES AND ACCESSORIES
SG9265065 . . . . . . . . . . . . . . . . . . Shielded probe made to IEC 61340-5-1
. . . . . . . . . . . . . . . . . . . . . . . . 63/30mm diameter, 2.5Kg weight (optional)
SG9265070 . . . . . . . . . . Concentric ring PROBE made to IEC 61340-5-1
. . . . . . . . . . . . . . . . . . . . . . . . 63/30mm diameter, 2.5Kg weight (optional)
SG9265013B. . . . . . . . . . . . . Connection cable jack 3.5mm - banana 4mm
SG9265056. . . . . . . . . . . . . . . . . . . . . . . Portable Kit including 100V tester
. . . . . . . . . . . . . . . . . . . . . . . . . . two SG9265065 probes and carrying case

CONTENT OF THE PACKAGE
The code SG9265051 includes:
- 1 MegaGuard Pro with battery
- 1 connection cable 9265.013B, 3.5mm jack - banana4mm
- Manual
- ISO9000 traceable calibration certificate.
- Box
Kit SG9265056 includes:
- 1 MegaGuard Pro with battery
- 2 connection cables SG9265013B, 3.5mm jack - banana4mm
- 2 probes SG9265065
- Manual
- ISO9000 traceable calibration certificate.
- Carrying case
PANEL
LEFT SOCKET
Input for external probe RIGHT SOCKET
Input for external probe
MEASURING VOLTAGE BATTERY LEVEL
MEASUREMENT BUTTON
BATTERY COVER

DISPLAY
At the top of the display the measured material is classified according to its
resistance.
It can be "CONDUCTIVE", "DISSIPATIVE", "INSULATIVE"
"CONDUCTIVE" if Rmeasured <105Ω
"DISSIPATIVE" if 105Ω< Rmeasured<1012Ω
"INSULATIVE" it 1012Ω< Rmeasured
Exponentialformat 4x10
09
Ω Natural format 4G Ω
In the lowerpartof thedisplaythe measurement voltageis indicated(10Vor
100V).
KEYBOARD
Button “10x”:
To display the measured resistance in natural or exponential format.
To enter the programming mode.
To move to the next menu while in programming mode.
Button “MEASURE”:
To make the measurement
To increase the value at the cursor location when you are in programming
mode.
Key “Exit”:
To turn on / off the instrument and to exit programming mode

MEASURING ELECTRODES
Left Socket
Right Socket Left Measuring Rubber
Right Measuring Rubber
"Right Socket" and "Right Measuring Rubber".
In one of these two points the HV measurement output is present.
The HV measurement output is connected to the "Right Measuring Rubber".
When the 3.5mm jack is inserted into the "Right Socket", the "Right
Measuring rubber" is automatically disconnected and the HV measurement
output connected to the 3.5mm jack
"Left Socket" and "Left Measuring Rubber".
In one of these two points the SIGNAL measurement input is present.
The SIGNAL measurement input is connected to the "Left Measuring
Rubber".
When the 3.5mm jack is inserted into the "Left Socket", the "Left Measuring
Rubber" is automatically disconnected and the SIGNAL measurement input
connected to the 3.5mm jack.
EXTERNAL PROBE CONNECTION
SG9265065 SG9265070
to the LEFT socket
to the RIGHT socket
GREY socket
= SHIELD
connect to GND
for Meas. >100GΩ
(recommended)
to the
RIGHT socket
or to the
LEFT socket
GREY socket
= SHIELD
connect to GND
for Meas. >100GΩ
(recommended)

OPERATIVE INSTRUCTIONS
ON / OFF
•In order to light-up MegaGuard Pro press "Exit".
•To shut-off MegaGuard Pro keep pressed the same key for 1 second
SURFACE RESISTANCE MEASUREMENT
•Be sure that the surface under test is clean and free of grease or other
chemicals than can create an isolant layer.
•In case of doubt clean the surface with a specifical detergent, without
alcohol or silicon, so that the non conductive layer will be removed.
•Place meter on test surface.
•Press the central "MEASURE" button and keep it pressed by applyinga
pressure of about 2.5Kg.
•Continue to keep the button pressed and wait until the reading will be
stable, settling time is higher for high resistance values.
RESISTANCE TO GROUND MEASUREMENT
•Be sure that the surface under test is clean and free of grease or other
chemicals than can create an isolant layer.
•In case of doubt clean the surface with a specifical detergent, without
alcohol or silicon, so that the non conductive layer will be removed.
•Insert the 3.5mm jack of the connecting cable into the Left Socket
(SIGNAL measurement input) and connect the banana 4mm to a safe
ground point.
•Place meter on test surface.
•Press the central "MEASURE" button and keep it pressed by applyinga
pressure of about 2.5Kg.
•Continue to keep the button pressed and wait until the reading will be
stable, settling time is higher for high resistance values.
•
POINT TO POINT RESISTANCE MEASUREMENT
•Be sure that the surface under test is clean and free of grease or other
chemicals than can create an isolant layer.
•Insert the 3.5mm jack of the connecting cable into the Right Socket (HV
measurementoutput)andconnectthebanana4mmtoaneternalprobe.
•Insert the 3.5mm jack of the connecting cable into the Left Socket
(SIGNAL measurement input) and connect the banana 4mm to an
external probe.
•Place meter on test surface.

•Press the central "MEASURE" button and keep it pressed by applyinga
pressure of about 2.5Kg.
•Continue to keep the button pressed and wait until the reading will be
stable, settling time is higher for high resistance values.
MEASURING PRECAUTIONS
ATTENTION: DURING GROUND RESISTANCE MEASURING, if the earth
reference point is faulty or unconnected, indefinite resistivity values may
appear.
IMPORTANT: If there are devices connected to the mains power supply on
the surfaceunder test,and even power cordsor other conductors under a.c.
voltage, problems on the readings may occur, because 50Hz may cause an
interference with the LABEOHM measuring circuit especially when
measuring high resistance values.
In case of doubt disconnect the mains power supply by opening the main
switch.
ALARM PROGRAM
In program mode you can set an audible alarm sounds when the resistance
measurement is below or above a certain threshold.
Hold the key for "10x" second to enter in the programming mode
Press the "10x" key to advance the cursor.
Press the "MEASURE" key to increase the cursor digit.
Press the "EXIT" key to exit the programming mode.
BATTERY REPLACEMENT
•Open the battery cover, unscrewing the 2 fixing screws.
•Replace the battery.
•Close the battery cover.