Rishabh Rish Insu 5Dx User manual

Release 1.01 - 04/02/16
Rish Insu 5Dx
5KV Digital Insulation Tester
User Manual

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Table of contents
1 PRECAUTIONS AND SAFETY MEASURES....................................................................................................2
1.1 Preliminary instructions ................................................................................................................................ 2
1.2 During use..................................................................................................................................................... 3
1.3 After use....................................................................................................................................................... 3
1.4 Definition of measurement (overvoltage) category........................................................................................ 3
2 GENERAL DESCRIPTION............................................................................................................................4
2.1 Instrument features ...................................................................................................................................... 4
3 PREPARATION FOR USE............................................................................................................................4
3.1 Initial inspections .......................................................................................................................................... 4
3.2 Power supply ................................................................................................................................................ 4
3.3 Calibration .................................................................................................................................................... 4
3.4 Storage ......................................................................................................................................................... 4
4 OPERATING INSTRUCTIONS .....................................................................................................................5
4.1 Instrument description.................................................................................................................................. 5
4.2 Description of function keys.......................................................................................................................... 5
4.3 Description of display.................................................................................................................................... 6
4.4 Description of measuring leads...................................................................................................................... 7
4.5 GUARD lead .................................................................................................................................................. 7
4.6 Notes on the insulation measurements ......................................................................................................... 7
4.7 Switch on the instrument .............................................................................................................................. 8
4.7.1 Configuration of the test parameters for FIX mode ............................................................................. 8
4.8 Insulation measurement in FIX mode ............................................................................................................ 9
4.8.1 Configuration of the test parameters for FIX mode ............................................................................12
4.9 Insulation measurement in ADJUST mode ....................................................................................................13
4.9.1 Configuration of the test parameters for ADJUST mode .....................................................................16
4.10 Insulation measurement in RAMP mode.......................................................................................................17
4.10.1 Configuration of the test parameters for RAMP#1 mode....................................................................21
4.10.2 Configuration of the test parameters for RAMP#2 mode....................................................................21
4.10.3 Configuration of the test parameters for RAMP#3 mode....................................................................22
4.11 Enable/Disable of SMOOTH function ............................................................................................................22
4.12 Anomalous situations...................................................................................................................................22
5 MANAGEMENT OF MEMORY DATA........................................................................................................25
5.1 Save measurements.....................................................................................................................................25
5.2 Delete measurements..................................................................................................................................25
5.3 Recall measurements...................................................................................................................................26
6 RESET OF INSTRUMENT .........................................................................................................................26
7 CONNECTION OF THE INSTRUMENT TO PC.............................................................................................26
8 MAINTENANCE ......................................................................................................................................27
8.1 General information.....................................................................................................................................27
8.2 Recharging internal battery..........................................................................................................................27
8.3 Cleaning the instrument...............................................................................................................................27
8.4 End of life.....................................................................................................................................................27
9 TECHNICAL SPECIFICATIONS ..................................................................................................................28
9.1 Reference guidelines....................................................................................................................................29
9.2 General characteristics.................................................................................................................................29
9.3 Environment ................................................................................................................................................30
9.4.1. Environmental conditions for use ......................................................................................................30
9.4 Accessories ..................................................................................................................................................30
9.4.1 Standard accessories .........................................................................................................................30
9.4.2 Optional accessories..........................................................................................................................30
10 SERVICE .................................................................................................................................................31
10.1 Service operation .........................................................................................................................................31
11 THEORETICAL APPENDIX........................................................................................................................32
11.1 Polarization Index (PI) ..................................................................................................................................32
11.2 Dielectric Absorbtion Ratio (DAR) .................................................................................................................32

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1PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with standards IEC/EN61557 and IEC/EN61010-1
regarding electronic measuring instruments.
CAUTION
For the operator’s safety and to prevent damaging the instrument, follow the
procedures described in this manual and carefully read all notes preceded by the
symbol .
Before and during measurements, carefully observe the following instructions:
Do not perform any measurement in humid environments, in the presence of gas or explosive
or inflammable material or in dusty areas
Even when no measurements are being performed, avoid any contact with the circuit being
tested, with exposed metal parts, with unused measuring leads or circuits, etc
Do not perform any measurement when anomalies are found in the instrument, such as
deformations, breaks, substance leaks, no display view, etc
Pay special attention when measuring voltages above 25V in special environments (building
yards, swimming pools, etc.) and 50V in ordinary environments, as there is the danger of
electric shocks.
In this manual and on the instrument, the following symbols are used:
CAUTION: it is necessary to consult the instruction manual to find the type of potential
danger and the actions to be taken.
Observe the instructions reported in the manual. An improper use could damage the
instrument and lead to dangerous situations for the operator.
DC voltage or current.
AC voltage or current.
Dangerous voltages: risk of electric shocks.
Instrument with double insulation.
1.1 PRELIMINARY INSTRUCTIONS
This instrument has been designed for use in an environment with pollution level 2
It may also be used to test industrial electrical systems up to overvoltage category IV 600V to
earth with maximum voltage 600V between inputs
Follow the usual safety rules to protect the operator from dangerous currents and protect the
instrument against improper use
Never use the instrument resting on the floor, it must be placed over flat horizontal surfaces
Only the accessories supplied with the instrument guarantee safety standards. They must be in
good conditions and replaced, if necessary, with identical models
Do not measure systems exceeding the current and voltage limit values specified
Do not perform measurements in environmental conditions not within the limit values
indicated in this manual
Before connecting the probes to the circuit to be tested, check that the correct function is
selected.

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1.2 DURING USE
Carefully read the following recommendations and instructions:
CAUTION
Failure to observe the cautions and/or instructions may damage the instrument
and/or its components or generate a danger for the operator. If, during use, the low
battery symbol appears on the display, insert the supply cable into the Mains socket
to start battery recharge. During battery recharge, it is possible to perform
measurements.
Before selecting a new function, disconnect the measuring probes from the circuit
When the instrument is connected to the circuit being tested, never touch any unused lead
Avoid measuring resistance with external voltages; even if the instrument is protected, as an
excess voltage may cause instrument malfunctions
Prevent that the instrument receives voltage during measurement (e.g. a probe slipping from
the measuring point and touching a point under voltage)
Avoid inserting the plug of the supply cable into the Mains socket while measuring.
1.3 AFTER USE
When measurements are completed, turn off the instrument by pressing the ON/OFF key.
1.4 DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard "IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control
and laboratory use, Part 1: General requirements", defines what is intended for measurement
category, commonly known as overvoltage category. In § 6.7.4: Measuring circuits, it reads:
Circuits are divided into the following measurement categories:
Measurement category IV is for measurements performed at the source of a low-voltage
installation
Examples are electric counters and measurements on primary devices protecting against
overcurrents and on ripple adjusting units
Measurement category III is for measurements performed on installations inside buildings
Examples are measurements performed on distribution boards, circuit breakers, wiring
harnesses, including cables, bars, junction boxes, switches, sockets of fixed installations and
appliances designed for industrial use and other equipment, e.g. stationary motors connected
to fixed systems.
Measurement category II is for measurements performed on circuits directly connected to the
low-voltage installation.
Examples are measurements performed on household appliances, portable tools and similar
equipment.
Measurement category I is for measurements performed on circuits not directly connected to
the MAINS.
Examples are measurements performed on circuits not derived from the MAINS and on circuits
derived from the MAINS provided with a special (internal) protection. In this latter case, the
stress caused by the transients is variable; therefore, (OMISSIS) it is necessary that the user
knows the appliance’s resistance to transients.

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2GENERAL DESCRIPTION
The instrument You purchased, if used in compliance with the indications given in this manual,
guarantees accurate and reliable measurements and the utmost safety thanks to a development
of new conception which ensures double insulation and, consequently, compliance with the
requirements of overvoltage category IV.
2.1 INSTRUMENT FEATURES
Insulation resistance measurement with nominal voltage which can be set up to 5kV
Dielectric leakage current measurement
Polarization Index (PI) measurement
Dielectric Absorption Ratio (DAR) measurement
Capacitance measurement.
AC/DC voltage measurement up to 600V
3PREPARATION FOR USE
3.1 INITIAL INSPECTIONS
Before shipment, the instrument’s electronics and mechanics have been inspected. All possible
precautions have been taken in order for the instrument to be delivered without damage.
However, we recommend generally inspecting the instrument in order to detect any damage
suffered during transport. Should you detect any anomalies, immediately contact the forwarding
agent or the dealer.
Moreover, we recommend checking that the package contains all parts listed in § 9.4. Should you
find any discrepancy, please contact the dealer. Should it become necessary to return the
instrument, please follow the instructions reported in § 10
3.2 POWER SUPPLY
The instrument is power-supplied through internal batteries which are recharged from the mains
by means of a battery charger integrated in the instrument itself. The symbol “ ” steadily
illuminated in the right bottom part indicates that the batteries are flat and must be recharged. To
recharge the batteries, follow the instructions given in § 8.2
CAUTION
Perform at least a complete recharging of internal battery in one year. If the
instrument is not used for one year, the battery can be damaged and could not be
completely recharging neither after some charging/discharging cycles.
3.3 CALIBRATION
The instrument complies with the technical specifications reported in this manual. Its correct
operation is guaranteed for one year from the date of purchase.
3.4 STORAGE
In order to guarantee accurate measurements and protect the instrument from possible failures,
after a long storage period under extreme environmental conditions, wait for the instrument to
return to a normal condition (see § 9.4.1).

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4OPERATING INSTRUCTIONS
4.1 INSTRUMENT DESCRIPTION
CAPTION:
1. Input bushings
2. Mains socket
3. RS232 connector
4. ON/OFF/ key
5. Multifunction arrow keys
6. FUNC/ERASE MEM key
7. MODE/CLEAR SMOOTH key
8. SET/DISPLAY MEM key
9. ESC/RECALL MEM key
10. SAVE key
11. START/STOP key
12. LCD display
Fig. 1: Instrument description
4.2 DESCRIPTION OF FUNCTION KEYS
Key
Description
Multifunction arrow keys they have several functions which are
described in detail below
ON/OFF/ key used for:
Switch on/off the instrument
Switch on the display’s backlighting for 20 seconds (short
pressing of the key with the instrument already on)
FUNC/ERASE MEM key used for:
Select the desired function
Delete the measurements saved during the display of memory
data
MODE/CLEAR SMOOTH key used for:
Change the internal modes (if there are more available modes)
The pressure of the key set the default value of the selected
parameter
SET/DISPLAY MEM key used for:
Set the test parameters of a function
The pressure of the key shows the dates of the measurement
saved inside the memory

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ESC/RECALL MEM key used for:
Access to the data saved in the memory (if present)
From a parameter setting screen or memory data display screen,
pressing the key once allows returning to the previous screen
SAVE key used for:
Once a measurement has been completed, pressing the key once
allows saving the results in the memory
From a parameter setting screen, pressing the key once allows
saving the changes made to the parameters
START/STOP key used for:
Start and/or stop a measurement
Table 1: Description of function keys
4.3 DESCRIPTION OF DISPLAY
Symbol
Description
Display group 1 shows:
Insulation resistance
Dielectric leakage current
PI (Polarization Index)
DAR (Dielectric Absorption Ratio)
Capacitance
Display group 2 shows:
Nominal test voltage
Generated test voltage
Display group 3 shows the duration time of the test
Bargraph
Modes available test : FIX, ADJUST and RAMP
, ,
“Flash”, Alarm (values over limits), “Warning” symbols
, ,
“Low battery", “Mains supply", “Timer” symbols
“Number of test cycles” symbol
Table 2: Description of symbols of display

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4.4 DESCRIPTION OF MEASURING LEADS
CAPTION:
1. Hand protection
2. Safety areas
Fig. 2: Measuring leads
4.5 GUARD LEAD
In some cases, measurements could be affected by surface currents. By applying voltage to an
insulation to be measured, there may be two distinct currents: one flowing in the test piece, the
other flowing on its surface. In case you want to measure only the resistance due to current Im
flowing in the test piece Rx (which is the significant one), it is necessary to absorb the surface
current If using another lead.
Fig. 3: Currents flowing in the test piece
4.6 NOTES ON THE INSULATION MEASUREMENTS
Measuring a high resistance such as the insulation resistance is very difficult as the value of the
currents considered may be very low. When measuring, to prevent making mistakes, it is therefore
necessary to take the following precautions:
CAUTION
Keep the measuring leads suspended above the path or, anyway, make sure the
leads do not make contact in more of one point
While measuring high resistances, the area around the measuring instrument and
the appliance being tested must be free. It is recommended to use the timer
function so that the operator may keep at due distance from the leads and from
the resistance to be tested
It is recommended to use the GUARD lead to measure resistances of some tens of
Gor higher
While use the instrument with main supply, it's important to check that the
earthed resistance pole to measure is connected to the instrument Rx+
Terminal

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4.7 SWITCH ON THE INSTRUMENT
After switch on, the instrument gives a short
acoustic signal and, for approximately one
second, all segments of the display appear.
Then, the instrument shows the firmware
version, then it sets to the last measuring mode
selected before turning off.
4.7.1 Configuration of the test parameters for FIX mode
If no test is being carried out, the instrument automatically turns off after approximately 5
minutes after the last time a key was pressed. To reactivate the instrument, it is necessary to turn
it on again by pressing the relevant key.

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4.8 INSULATION MEASUREMENT IN FIX MODE
This measurement mode, performed in compliance with IEC/ EN61557-2 guideline, allows a quick
selection of the test voltage among the values: 250, 500, 1000, 2500, and 5000VDC.
CAUTION
The instrument may be used on installations of overvoltage category CAT IV 600V
to earth with maximum voltage 600V between inputs. Do not connect the
instrument to installations with voltages exceeding the limit values indicated in
this manual. If these limit values are exceeded, the operator may be exposed to
electrical shocks and the instrument could get damaged
Always connect the measuring leads to the instrument and to the alligator clips
with the accessories disconnected from the system
It is recommended to hold the alligator clip respecting the safety area marked by
the hand protection (see § 4.4)
Fig. 4: Instrument connection
1.
Turn on the instrument by press ON/OFF/ key
2.
Press the FUNC/ERASE MEM key to select the “FIX” mode
3.
The display shows a screen similar to that
reported here to the side, which contains:
The FIX selected mode
The bargraph set to zero
The "--- TΩ" indication
The selected test voltage
The test time value
The plug symbol (if the instrument is
supplied from the mains)
The battery symbol steadily
illuminated or flashing (if batteries are
flat or are being recharged)
The TIMER symbol if the duration of
the test has been set

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4.
By pressing the arrow keys, the
instrument shows a screen similar to that
reported here to the side, which contains
the value of the input voltage.
5.
Press the MODE/CLEAR SMOOTH key to set one of the following test voltages: 250V, 500V,
1000V, 2500V, 5000V
6.
Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx and
GUARD, if necessary (see § 4.5 and Fig. 4)
CAUTION
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
7.
Connect the alligator clips to the part of the system to be tested
8.
Press the START/STOP key to perform measurement
CAUTION
The display shows the message "Measuring..." which indicates that the instrument is
performing the measurement. During this whole phase:
Do not disconnect the measuring leads of the instrument from the conductor
being tested; the conductor could remain live at a dangerous voltage because of
possible stray capacitances in the circuit tested;
Never insert the power cord into the Mains socket
9.
During measurement, the instrument
gives a short acoustic signal every second
and the display shows a screen similar to
that reported here to the side, which
contains:
The FIX selected mode
The bargraph proportional to the
measured resistance value
The numerical indication of the
measured resistance
The applied test voltage
The symbol of the alarm bell (if the measured value is not within the set limits and/or if
the value of the test voltage is lower than the set nominal value)
The value of the test time elapsed or remaining (if a test has been set)
The plug symbol (if the instrument is supplied from the mains)
The battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged)
The timer symbol if the duration of the test has been preset
The two "flash" symbols to indicate a dangerous voltage
The message "MEASURING..."

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While measuring, it is also possible to display the leakage current, the DAR (Dielectric Absorption
Ratio if test duration > 1 minute), the PI (Polarization Index if test duration > 10 minutes) which
cyclically show when pressing the arrow keys (see § 11.1)
10.
If no measuring time was set when setting the parameters or if you want to stop the test in
advance before the set time elapses, press the START/STOP key
11a.
Once measurement is complete and any
capacitance has been discharged, the
instrument shows:
The value of the measured insulation
resistance;
The value of the generated voltage;
The duration of the test
If the measured resistance value is
between the (MIN - MAX) limits
previously set, the instrument shows
OK and gives a double acoustic signal
(see § 4.10.1)
OR
11b.
Once measurement is complete and any
capacitance has been discharged, the
instrument shows:
The value of the measured insulation
resistance
The value of the generated voltage
The duration of the test
If the measured resistance value is not
between the (MIN - MAX) limits
previously set, the instrument shows
NOT OK, the alarm bell and gives a
long acoustic signal (see § 4.10.1)
12.
Once measurement is complete, it is also possible to display the leakage current, the DAR
(Dielectric Absorption Ratio), the PI (Polarization Index) and the capacitance which cyclically
show when pressing the arrow keys (see § 11.1)
CAUTION
If the measured resistance value < 5.0M, the screen displaying the capacitance
shows three hyphens “---“, to indicate that it was impossible to measure the
capacitance, and the symbol
If, when scrolling the results obtained, the capacitance value is > 1nF, it is
recommended to repeat the measurement by activating the SMOOTH function
(see § 4.11)
13.
Measures can be saved by pressing the SAVE key twice (see § 5.1)

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4.8.1 Configuration of the test parameters for FIX mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is possible to select the following
parameters:
Minimum value of the insulation (MIN) in a range between 0,01M- MAX
Maximum value of the insulation (MAX) in a range between (MIN) - 10T
Test time value in a range between (00min:05sec) - (99min:59 sec)
b.
Press the arrow keys to change the value of the parameters (a long pressing of the keys
allows a rapid change of the values)
c.
Press the MODE/CLEAR SMOOTH key to remove the limit values set for the parameters. The
display shows the message "no" to indicate that there is no limit set.
d.
After setting, press the SAVE key to save the changes made or press the ESC/RECALL MEM
key to exit without saving and return to the previous screen

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4.9 INSULATION MEASUREMENT IN ADJUST MODE
This function is performed in compliance with IEC/ EN61557-2 guideline. The ADJUST mode allows
the fine adjustment of the test voltage between 100 - 5000VDC.
CAUTION
The instrument may be used on installations of overvoltage category CAT IV 600V
to earth with maximum voltage 600V between inputs. Do not connect the
instrument to installations with voltages exceeding the limit values indicated in
this manual. If these limit values are exceeded, the operator may be exposed to
electrical shocks and the instrument could get damaged
Always connect the measuring leads to the instrument and to the alligator clips
with the accessories disconnected from the system
We recommend holding the alligator clip respecting the safety area marked by
the hand protection (see § 4.4)
Fig. 5: Instrument connection
1.
Turn on the instrument by pressing the relevant key
2.
Press the FUNC/ERASE MEM key to select the “ADJUST” mode
3.
The display shows a screen similar to that
reported here to the side, which contains:
The ADJUST function selected
The bar graph set to zero
The indication "--- TΩ"
The test voltage
The value of the test time
The plug symbol (if the instrument is
supplied from the mains)
The battery symbol steadily
illuminated or flashing (if batteries are
flat or are being recharged)
The timer symbol if the duration of the
test has been preset

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4.
By pressing the arrow keys, the
instrument shows a screen similar to that
reported here to the side, which contains
the value of the input voltage.
5.
Make sure that the set test voltage is the desired one. Should it not be the case, please refer
to § 4.9.1 to change it
6.
Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx and
GUARD, if necessary (see § 4.5 and Fig.5)
CAUTION
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
7.
Connect the alligator clips to the part of the system to be tested.
8.
Press the START/STOP key to perform measurement
CAUTION
The display shows the message “Measuring…” which indicates that the instrument is
performing the measurement. During this whole phase:
Do not disconnect the measuring leads of the instrument from the conductor
being tested; the conductor could remain live at a dangerous voltage because of
possible stray capacitances in the circuit tested
Never insert the power cord into the Mains socket
9.
During measurement, the instrument gives a
short acoustic signal every second and the
display shows a screen similar to that
reported here to the side, which contains:
The ADJUST function selected
The bar graph proportional to the
measured resistance value
The numerical indication of the
measured resistance
The actual test voltage
The symbol of the alarm bell (if the measured value is not within the set limits and/or if
the value of the test voltage is lower than the set nominal value)
The value of the test time elapsed or remaining (if a test has been set)
The plug symbol (if the instrument is supplied from the mains)
The battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged)
The timer symbol if the duration of the test has been preset
The two “flash” symbols to indicate a dangerous voltage
The message “MEASURING…”

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While measuring, it is also possible to display the leakage current, the DAR (Dielectric
Absorption Ratio if test duration > 1 minute), the PI (Polarization Index if test duration > 10
minutes) which cyclically show when pressing the arrow keys (see §11.1)
10.
If no measuring time was set when setting the parameters or if you want to stop the test in
advance before the set time elapses, press the START/STOP key
11a.
Once measurement is complete and any
capacitance has been discharged, the
instrument shows:
The value of the measured insulation
resistance
The value of the generated voltage
The duration of the test
If the measured resistance value is
between the (MIN - MAX) limits
previously set, the instrument shows
OK and gives a double acoustic signal
(see § 4.9.1)
OR
11b.
Once measurement is complete and any
capacitance has been discharged, the
instrument shows:
The value of the measured insulation
resistance
The value of the generated voltage
The duration of the test
If the measured resistance value is not
between the (MIN - MAX) limits
previously set, the instrument shows
NOT OK, the alarm bell and gives a
long acoustic signal (see § 4.9.1)
12.
Once measurement is complete, it is also possible to display the leakage current, the DAR
(Dielectric Absorption Ratio), the PI (Polarization Index) and the capacitance which cyclically
show when pressing the arrow keys (see § 11.1)
CAUTION
If the measured resistance value < 5,0M, the screen displaying the capacitance
shows three hyphens “---“, to indicate that it was impossible to measure the
capacitance, and the symbol
If, when scrolling the results obtained, the capacitance value is > 1nF, it is
recommended to repeat the measurement by activating the SMOOTH function
(see § 4.11)
13.
Measures can be saved by pressing the SAVE key twice (see § 5.1)

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4.9.1 Configuration of the test parameters for ADJUST mode
a.
By cyclically pressing the SET/DISPLAY MEM key, it is possible to select the following
parameters:
Minimum value of the insulation (MIN) in a range between 0.01M- MAX
Maximum value of the insulation (MAX) in a range between (MIN) - 10T
Value of the test voltage in a range between 100V - 5000V (can be set in steps of 25V up
to 1000V and in steps of 50V from 1000V to 5000V)
Test time value in a range between (00min:05sec) - (99min:59 sec).
b.
Press the arrow keys to change the value of the parameters (a long pressing of the keys
allows a rapid change of the values).
c.
Press the MODE/CLEAR SMOOTH key to remove the limit values set for the parameters. The
display shows the message "no" to indicate that there is no limit set. Only when setting the
value of the test voltage, by pressing the MODE/CLEAR SMOOTH key, the voltage sets to
the default value of 1000V.
d.
After setting, press the SAVE key to save the changes made or press the ESC/RECALL MEM
key to exit without saving and return to the previous screen

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4.10 INSULATION MEASUREMENT IN RAMP MODE
This function is performed in compliance with standard IEC/ EN61557-2. The RAMP mode allows
choosing among three different types of ramps:
RAMP#1 RAMP#2 RAMP#3
For each type of ramp, it is possible to set the duration, the test voltage and the number of times
the ramp is repeated (§ 4.10.1, § 4.10.2, § 4.10.3).
RAMP#1: Voltage starts from 0V, reaches the value V1 in a time interval T, keeps the value
V1 for a time T1, and finally returns to 0 (with possible discharge of the residual
voltage).
RAMP#2: Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a time
interval T, and finally returns to 0 (with possible discharge of the residual voltage).
RAMP#3: Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a time
interval T, keeps to value V1 for a time T1, and finally returns to 0 (with possible
discharge of the residual voltage).
CAUTION
The instrument may be used on installations of overvoltage category CAT IV 600V
to earth with maximum voltage 600V between inputs. Do not connect the
instrument to installations with voltages exceeding the limit values indicated in
this manual. If these limit values are exceeded, the operator may be exposed to
electrical shocks and the instrument could get damaged
Always connect the measuring leads to the instrument and to the alligator clips
with the accessories disconnected from the system
It is recommended to hold the alligator clip respecting the safety area marked by
the hand protection (see § 4.4)
Fig. 6: Instrument connection
1.
Turn on the instrument by press the ON/OFF/ key
2.
Press the FUNC key to select the RAMP function

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3.
The display shows a screen similar to that
reported here to the side, which contains:
The RAMP type selected
The bar graph set to zero
The indication "--- T"
The set test voltage
The value of the test time
The plug symbol (if the instrument is
supplied from the mains)
The battery symbol steadily illuminated
or flashing (if batteries are flat or are
being recharged)
The timer symbol if the duration of the
test has been preset.
4...
By pressing the arrow keys, the instrument
shows a screen similar to that reported
here to the side, which contains the value
of the input voltage.
5.
Insert the measuring leads into the relevant input leads of the instrument -Rx, +Rx and
GUARD, if necessary (see § 4.5 and Fig. 6)
CAUTION
Make sure that there is no voltage at the ends of the measuring points before
connecting them to the measuring leads.
6.
Connect the alligator clips to the part of the system to be tested.
7.
Press the START/STOP key to perform measurement.
CAUTION
The display shows the message "Measuring..." which indicates that the instrument is
performing the measurement. During this whole phase:
Do not disconnect the measuring leads of the instrument from the conductor
being tested; the conductor could remain live at a dangerous voltage because of
possible stray capacitances in the circuit tested
Never insert the power cord into the Mains socket

Rish Insu 5Dx
19
8.
During measurement, the instrument gives
a short acoustic signal every second and
the display shows a screen similar to that
reported here to the side, which contains:
The RAMP function selected
The bar graph proportional to the
measured resistance value
The numerical indication of the
measured resistance
The segment relevant to the current ramp point, flashing
The actual test voltage (relevant to the current ramp point)
The symbol of the alarm bell (if the measured value is not within the set limits and/or if
the value of the test voltage is lower than the set nominal value)
The value of the remaining test time (relevant to the current ramp point)
The plug symbol (if the instrument is supplied from the mains)
The battery symbol steadily illuminated or flashing (if batteries are flat or are being
recharged)
The timer symbol
The two "flash" symbols to indicate a dangerous voltage
The message "MEASURING..."
While measuring, it is also possible to display the leakage current, the capacitance the
number N of the cycle the instrument is performing, which cyclically show when pressing
the arrow keys.
9...
If you want to stop the test in advance before the set number N of cycles is reached, press
the START/STOP key.
10a.
Once measurement is complete and any
capacitance has been discharged, the
instrument shows:
The value of the measured insulation
resistance
The value of the actually generated
voltage V1
The value of the time relevant to
parameter T1
If the measured resistance value is
between the (MIN - MAX) limits
previously set, the instrument shows
OK and gives a double acoustic signal
(see § 4.10.1, § 4.10.2, § 4.10.3)
OR