ENGLISH User manual
ENGLISH
User manual
 Copyright HT ITALIA 2013
Release EN 2.00 - 02/01/2013
HT7052
Table of Content:
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 .......................................................................................................... 5 3.1 Initial inspections .................................................................................................................................. 5 3.2 Instrument power supply ...................................................................................................................... 5 3.3 Calibration ............................................................................................................................................ 5 3.4 Storage ................................................................................................................................................. 5 4 DESCRIPTION OF PARTS.......................................................................................................... 6 4.1 Instrument description .......................................................................................................................... 6 4.2 Description of test leads ....................................................................................................................... 7 5 INITIAL OPERATIONS ................................................................................................................ 8 5.1 Switching on the instrument ................................................................................................................. 8 5.1.1 Mains powered instrument operation ................................................................................................ 8 5.1.2 Backlight operation ............................................................................................................................ 8 5.1.3 Autocalibration................................................................................................................................... 8 5.2 Configuration and Setup of systems parameters ................................................................................. 9 6 HOW TO PERFORM THE MEASUREMENTS .......................................................................... 10 6.1 Theory of insulation resistance measurement ................................................................................... 10 6.1.1 Time dependence test – Diagnostic test ......................................................................................... 12 6.1.2 Withstanding voltage test ................................................................................................................ 15 6.2 Guard terminal .................................................................................................................................... 16 6.3 Use of internal filters........................................................................................................................... 17 6.3.1 The purpose of filtering.................................................................................................................... 17 6.4 Voltage measurement ........................................................................................................................ 18 6.5 Insulation resistance measurement ................................................................................................... 19 6.5.1 Setting of parameters ...................................................................................................................... 19 6.5.2 Perform the measurement............................................................................................................... 20 6.6 Diagnostic test .................................................................................................................................... 22 6.6.1 Setting of parameters ...................................................................................................................... 22 6.6.2 Perform the measurement............................................................................................................... 23 6.7 Insulation resistance with step voltage test ........................................................................................ 25 6.7.1 Setting of parameters ...................................................................................................................... 25 6.7.2 Perform the measurement............................................................................................................... 26 6.8 Withstanding voltage test ................................................................................................................... 28 6.8.1 Setting of parameters ...................................................................................................................... 28 6.8.2 Perform the measurement............................................................................................................... 29 7 MANAGEMENT OF MEMORY DATA ....................................................................................... 30 7.1 Saving, recall and clear measurement results ................................................................................... 30 8 CONNECTION OF THE INSTRUMENT TO PC ........................................................................ 31 8.1 Installation of software and initial configurations (Win XP) ................................................................ 31 9 MAINTENANCE ......................................................................................................................... 33 9.1 General information ............................................................................................................................ 33 9.2 Replacement and charging batteries ................................................................................................. 33 9.3 Cleaning the instrument ..................................................................................................................... 33 9.4 End of life............................................................................................................................................ 33 10 TECHNICAL SPECIFICATIONS ............................................................................................... 34 10.1 Safety standards ................................................................................................................................ 35 10.2 General characteristics....................................................................................................................... 36 10.3 Environment ....................................................................................................................................... 36 10.4 Accessories ........................................................................................................................................ 36 11 SERVICE ................................................................................................................................... 37 11.1 Warranty conditions............................................................................................................................ 37 11.2 Service................................................................................................................................................ 37 EN - 1
HT7052
1 PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with standards IEC/EN61557-1 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:
WARNING: 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
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 CAT 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
EN - 2
HT7052
1.2 DURING USE
Carefully read the following recommendations and instructions:
CAUTION





Failure to observe the warnings 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 Europlug 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
In case of a capacitive test object (long tested cable etc.), automatic discharge of the
object may not be done immediately after finishing the measurement – “Please wait,
discharging” message will be displayed
Handling with capacitive loads note that 40nF charged to 1kV or 5nF charged to 10 kV
are hazardous live
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 lowvoltage 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
EN - 3
HT7052
2 GENERAL DESCRIPTION
The instrument HT7052 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
 High insulation resistance measurement up to 10 T
 Programmable test voltage from 500V up to 10 kV, step 25 V
 R(t) Graphs
 Programmable timer (1s up to 30 min)
 Automatic discharge of test object after completion of measurement
 Capacitance measurement
 Insulation resistance measurement with step-up voltage test
 Five discrete test voltages proportionately set within preset test voltage range
 Programmable timer 1 min up to 30 min per step
 Polarization Index (PI), Dielectric Absorption ratio (DAR) and Dielectric Discharge (DD)
ratio measurements
 PI = Rins (t2) / Rins (t1)
 DAR = R1min / R15s
 DD = Idis1min / C*U
 Withstanding voltage (DC) up to 10 kV
 Programmable ramp test voltage from 500 V up to 10 kV
 High resolution ramp (approx. 25 V per step)
 Programmable threshold current up to 5mA
 Voltage and frequency measurement up to 600 V AC/DC
A dot matrix LCD offers easy-to-read results and all associated parameters. The operation
is straightforward and clear to enable the user to operate the instrument without the need
for special training (except reading and understanding this user manual)
Test results can be stored on the instrument. The new professional PC SW enables
straightforward transfer of test results and other parameters in both directions between the
test instrument and PC
EN - 4
HT7052
3 PREPARATION 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 § 10.4.
Should you find any discrepancy, please contact the dealer. Should it become necessary
to return the instrument, please follow the instructions reported in § 11
3.2 INSTRUMENT POWER SUPPLY
The instrument is power-supplied through 6x1.2V IEC LR20 NiMH internal rechargeable
batteries which are recharged from the mains by means of a battery charger integrated in
the instrument itself. The symbol “
“ illuminated in the left bottom part indicates that
the batteries are flat and must be recharged. To recharge or replace the batteries, follow
the instructions given in § 10.2
CAUTION
 Use only NiMh rechargeable batteries (IEC LR20)
 Connect the instrument to the mains power supply for 20 hours to fully
charge batteries (typical charging current is 600mA). When you charge the
batteries for the first time, it normally takes about 3 charge and discharge
cycles for the batteries to regain full capacity
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 the environmental specifications listed in §
0)
EN - 5
HT7052
4 DESCRIPTION OF PARTS
4.1
INSTRUMENT DESCRIPTION
Fig. 1: Instrument description
LEGEND:
1
2
3-4-5-6
7
8
9
10
11
12 -13
14
15
16
17
18
19
20
21
ON/OFF key to switch the instrument ON or OFF
START/STOP key to start or stop any measurement
, , , arrow keys to select parameters and set values
SELECT key to enter set-up mode parameters
ESC key to exit the selected mode
MEM key to store, recall and erase results
Light key to turn the display backlight ON or OFF
Positive insulation resistance test terminal +OUTPUT
GUARD test terminals intended to lead away potential leakage current
Negative insulation resistance test terminal –OUTPUT
Screw to fixing battery cover
Battery cover
USB galvanic port for connection to PC
RS-232 galvanic port for connection to PC
Mains connector to connect the instrument to the mains supply
LCD display
Label with serial number of the instrument
EN - 6
HT7052
4.2 DESCRIPTION OF TEST LEADS
Test lead 1
This test lead is designed for hand held testing of
insulation resistance
Features
 Shielded cable in order to increase the immunity to
external disturb and improve the accuracy of
measurements
 Insulation of yellow shielded cable: 12kVDC
 Length cable = 2m
 Test lead with double insulation and protection
10kVDC
 Red banana connector with basic protection 10kVDC
and double protection 5kVDC
 Green guard banana connector: CAT IV 600V
Test leads 2
These test leads is designed for diagnostic testing of
insulation
Features
 Shielded cables in order to increase the immunity to
external disturb and improve the accuracy of
measurements
 Insulation of yellow shielded cables: 12kVDC
 Length cables = 2m
 Red/black banana connectors with basic protection
10kVDC and double protection 5kVDC
 Green guard banana connectors: CAT IV 600V
 Red/Black alligator clips with basic protection
10kVDC and double protection 5kVDC
Guard test lead
This test lead is used in connection with the object on
test in order to reduce or cancel the surface leakage
current (see § 6.2)
Features
 Cable banana-banana with protection CAT IV 600V
 Alligator clip CAT IV 600V
EN - 7
HT7052
5 INITIAL OPERATIONS
5.1 SWITCHING ON THE INSTRUMENT
5.1.1 Mains powered instrument operation
CAUTION
 If you connect instrument to the mains supply when instrument is turned
OFF, internal charger will begin to charge the batteries but instrument will
remain turned OFF. In button left angle of LCD, flashing battery indicator
will appear to indicate that the batteries are charging
 If batteries are defective or missing and the instrument is connected
to the mains, the instrument do not switch on
 If batteries are defective or missing, the charger will not work. In
button left corner of LCD screen only plug character will be appeared
 If the instrument is connected to the mains supply when the instrument is
turn ON, the instrument will automatically switch from the battery supply to
the main supply. In button left corner of the LCD screen, the plug character
will appear
 If instrument is not in measuring mode*, the internal charger will begin to
charge the batteries. In button left corner of LCD screen battery indicator
will start to flash, indicating that the batteries are charging
 It is recommended to DO NOT connect or disconnect the instrument to
mains supply while the instrument is in measuring mode
5.1.2 Backlight operation
Instrument supplied by the batteries
After turning the instrument ON the LCD backlight is automatically turned ON. It can be
turned OFF and ON by simply clicking the LIGHT key
Instrument supplied by the mains
After turning the instrument ON the LCD backlight is automatically turned OFF. It can be
turned OFF and ON by simply clicking the LIGHT key
Auto power OFF
The instrument can be switched OFF only by pressing the ON/OFF key. The auto-off
function is not available to allow long-term measurements to be performed
5.1.3 Autocalibration
The instrument is switched ON by pressing the ON/OFF key. After turning on, the
instrument will perform the autocalibration (see Fig. 3). Measuring test leads should be
disconnected during autocalibration. If not, the autocalibration procedure could be false
and instrument will require disconnection of the test leads and repeat switching OFF and
ON
Fig. 2: Spash screen
Fig. 3: Autocalibration
Fig. 4: Main menu
After finishing the autocalibration, the main menu (see Fig. 4) will appear and instrument
is ready for normal operation
EN - 8
HT7052
Auto-calibration prevents the reduction in accuracy when measuring very low currents. It
compensates the effects caused by ageing, temperature and humidity changes etc. A new
auto-calibration is recommended when the temperature changes by more than 5C. If the
instrument detects an incorrect state during the autocalibration, the following warning
message will be displayed:
CAUTION
 TEST LEADS CONNECTED: DISCONNECT AND SWITCH ON THE
INSTRUMENT AGAIN
 CONDITIONS OUT OF RANGE: PRESS START TO CONTINUE
Possible reasons for out of range conditions are excessive humidity, excessively high
temperature, etc. In this case it is possible to perform measurements by pressing the
START/STOP button again but results could be out of technical specification
5.2 CONFIGURATION AND SETUP OF SYSTEMS PARAMETERS
The configuration and setup function enables the selection and adjustment of the
parameters (see Table 1) that are not directly involved in the measurement procedure (see
Fig. 5 and Fig. 6). In the lower section of the display the power supply status is shown
Fig. 5: Configuration menu
PARAMETERS
Memory clear
Filter
DIAG. Starting
time
Contrast
Time
Date
COM port
Language
Initialization
Fig. 6: Setup menu
VALUE
DESCRIPTION
Clear all memory locations
Selection of noise rejecting filter (see § 6.3)
Adjustment of start of the timer in the
DIAGNOSTIC TEST functions, according to the
nominal voltage Unominal. See additional
explanation in § 6.1)
Adjustment of the LCD contrast
Set real time (hour: minute)
Set current date (day-month-year)
Fil1, Fil2, Fil3, Fil0
0%…90%
0%…100%
RS232 2400, RS232 4800,
RS232 9600,RS232 19200,
USB 115000
Ita, Eng, Esp, Deu
Set communication mode and rate
Set system language
For internal factory and service maintenance
only
Table 1: Configuration of system parameters
1. Use  and  arrows to select parameter (line) to be adjusted
2. Use  or  arrows to change the value of the selected parameter. If there are two or
more sub-parameters in one line (e.g. date and time) then use the SELECT key to skip
to the next sub-parameters and back
3. Press the ESC key to exit from configuration and back to the main menu
EN - 9
HT7052
6 HOW TO PERFORM THE MEASUREMENTS
6.1
THEORY OF INSULATION RESISTANCE MEASUREMENT
The purpose of insulation tests
Insulating materials are important parts of almost every electrical product. The material’s
properties depend not only on its compound characteristics but also on temperature,
pollution, moisture, ageing, electrical and mechanical stress, etc. Safety and operational
reliability require the regular maintenance and testing of the insulation material to ensure it
is kept in good operational condition. High voltage tests are used to test insulating
materials
DC vs. AC testing voltage
Testing with a DC voltage is widely accepted as being useful as testing with AC and / or
pulsed voltages. DC voltages can be used for breakdown tests especially where high
capacitive leakage currents interfere with measurements using AC or pulsed voltages. DC
is mostly used for insulation resistance measurement tests. In this type of test, the voltage
is defined by the appropriate product application group. This voltage is lower than the
voltage used in the withstanding voltage test so the tests can be applied more frequently
without stressing the test material
Typical insulation tests
In general, insulation resistance tests consist of the following possible procedures:
 Simple insulation resistance measurement also called a spot test
 Measurement of the relationship between voltage and insulation resistance
 Measurement of the relationship between time and insulation resistance
 Test of residual charge after the dielectric discharge
The results of this test can indicate whether the replacement of the insulation system is
required. Typical examples of where testing insulation resistance and its diagnosis are
recommended are transformer and motor insulation systems, cables and other electrical
equipment
Electrical representation of insulating material
The represents the equivalent electrical circuit of an insulating material
Itest
+
m aterial
surface
R iss1
R iso
G u ard
IPI
C pi
C iso
R pi
Itest
I Ci so
R iss2
I Ri so
I Ri ss
-
Fig. 7: Equivalent electrical circuit
Fig. 8: Current graphs
EN - 10
HT7052
Riss1, Riss2 = surface resistivity (position of optional guard connection)
Riso = the actual insulation resistance of material
Ciso = capacitance of material
Cpi, Rpi = represents polarization effects
The Fig. 8 shows typical currents for that circuit, where:
Itest = overall test current (Itest= IPI+ IRISO+ IRISS)
IPI = polarization absorption current
IRISO = actual insulation current
IRISS = surface leakage current
Basic Insulation resistance test
Virtually every standard concerning the safety of electrical equipment and installations
requires the performance of a basic insulation testing. When testing lower values (in the
range of M), the basic insulation resistance (Riso) usually dominates. The results are
adequate and stabilize quickly
It is important to remember the following:
 The voltage, time and limit are usually given in the appropriate standard or regulation
 Measuring time should be set to 60 s or the minimum time required for the Insulation
capacitance Ciso to be charged up
 Sometimes it is required to take ambient temperature into account and adjust the result
for a standard temperature of 40C
If surface leakage currents interfere with the measurements (see Riss above) use the
guard connection (see § 5.2.). This becomes critical when measured values are in the G
range
Voltage dependence test – Step voltage test
This test shows if the insulation under test has been electrically or mechanically stressed.
In this instance the quantity and size of insulation anomalies (e.g. cracks, local
breakdowns, conductive parts, etc). is increased and the overall breakdown voltage is
reduced. Excessive humidity and pollution have an important role especially in the case of
mechanical stress. If the results of successive tests show a reduction in the tested
insulation resistance the insulation should be replaced
In this function the instrument measure the insulation resistance by considering 5 equal
time intervals with the test voltage divided from 1/5 of nominal value to the set nominal
value (see Fig. 9)
Fig. 9: Insulation measurement with step voltage test
EN - 11
HT7052
6.1.1 Time dependence test – Diagnostic test
Diagnostic test is a long duration test for evaluating the quality of the insulation material
under test. The results of this test enable the decision to be made on the preventive
replacement of the insulation material
DIELECTRIC ABSORPTION RATIO (DAR)
DAR is ratio of Insulation Resistance values measured after 15s and after 1 minute. The
DC test voltage is present during the whole period of the test (also an Insulation
Resistance measurement is continually running). At the end, the DAR ratio is displayed:
DAR 
R 1 min 
R 15s 
iso
iso
Some applicable values:
DAR value
< 1.25
< 1.6
> 1.6
Tested material status
Not acceptable
Considered as good insulation
Excellent
When determining Riso (15s) pay attention to the capacitance of the test object. It has to
be charged-up in the first time section (15s). Approximate maximum capacitance using:
s .
C F   t 10
U V 
3
max
where:
t = period of first time unit (e.g. 15s)
U = test voltage.
To avoid this problem, increase the DIAG. Starting time parameter in CONFIGURATION
menu, because start of timer in the DIAGNOSTIC TEST functions depends on the test
voltage. The timer begins to run when test voltage reaches the threshold voltage, which is
product of the DIAG. Starting time and nominal test voltage (Unominal)
Using filters (fil1, fil2, fil3) in the DAR function is not recommended!
Analysing the change in the measured insulation resistance over time and calculating the
DAR and PI are very useful maintenance tests of an insulating material
EN - 12
HT7052
POLARIZATION INDEX (PI)
PI is the ratio of Insulation Resistance values measured after 1 minute and after 10
minutes. The DC test voltage is present during the whole period of the measurement (an
Insulation Resistance measurement is also running). On completion of the test the PI ratio
is displayed:
PI 
R 10 min 
R 1 min 
iso
iso
General applicable values:
PI value
Tested material status
Not acceptable (older types)
Considered as good insulation (older types)
Modern type of (good) insulation systems
1 to 1.5
2 to 4 (typically 3)
>4(very high insulation resistance)
When determining Riso (1min) pay close attention to the capacitance of the object under
test. It has to be charged-up in the first time section (1 min). Approximate maximum
capacitance using:
s .
C F   t 10
U V 
3
max
where:
t = period of first time unit (e.g. 1min)
U = test voltage
To avoid this problem, increase the DIAG. Starting time parameter in CONFIGURATION
menu, because start of timer in the DIAGNOSTIC TEST functions depends on the test
voltage. The timer begins to run when test voltage reaches the threshold voltage, which is
product of the DIAG. Starting time and nominal test voltage (Unominal)
EN - 13
HT7052
DIELECTRIC DISCHARGE RATIO (DD)
An additional effect of polarization is the recovered charge (from Cpi) after the regular
discharging of a completed test. This can also be a supplementary measurement for
evaluation of the quality of insulating material. This effect is generally found in insulating
systems with large capacitance Ciso. The polarisation effect (described in “Polarisation
Index”) causes a capacitance to form (Cpi). Ideally this charge would dissipate
immediately a voltage was removed from the material. In practice, this is not the case
DD is the diagnostic insulation test carried out after the completion of the Insulation
Resistance measurement. Typically the insulation material is left connected to the test
voltage for 10  30 min and then discharged before the DD test is carried out. After 1
minute a discharge current is measured to detect the charge re-absorption of the insulation
material. A high re-absorption current indicates contaminated insulation (mainly based on
moisture:
DD 
Idis1 minmA
U V .C F 
where:
Idis 1min = discharging current measured 1 min after regular discharge
U= test voltage
C= capacitance of test object
General applicable values:
DD Value
>4
2-4
<2
Tested material status
Bad
Critical
Good
EN - 14
HT7052
6.1.2 Withstanding voltage test
Some standards allow the use of a DC voltage as an alternative to AC withstanding
voltage testing. For this purpose the test voltage has to be present across the insulation
under test for a specific time. The insulation material only passes if there is no breakdown
or flash over. Standards recommend that the test starts with a low voltage and reaches the
final test voltage with a slope that keeps the charging current under the limit of the current
threshold. The test duration normally takes 1 min
The instruments offers Withstanding Voltage test of insulation material. It covers two types
of tests:
 Breakdown voltage testing of high voltage device, e.g. transient suppressors and
 DC withstanding voltage test for insulation coordination purposes
Both functions require breakdown current detection. The test voltage increases step by
step from the Start up to the Stop value over a predefined time and it is kept at the Stop
value for a predefined test time (see Fig. 10 – left part) or it happens the breakdown on
device under test (see Fig. 10 – right part)
Fig. 10: Withstanding test without breakdown (left) and with breakdown (right)
Ut = test voltage
t = time
Ustart = starting voltage
Ustep = voltage step approx. 25 V (fixed value - not modify)
Ustop = end test voltage
Tstep = test voltage duration per step
Tend = constant test voltage duration after reaching End value
Ub = breakdown voltage
Humidity and insulation resistance measurements
When testing outside the reference ambient conditions, the quality of the insulation
resistance measurements can be affected by humidity. Humidity adds leakage paths onto
the surface of the complete measuring system, (i.e. the insulator under test, the test leads,
the measuring instrument etc). The influence of humidity reduces accuracy especially
when testing very high resistances (e.g. T). The worst conditions arise in environments
containing high condensation, which can also reduce safety. In the case of high humidity, it
is recommended to ventilate the test areas before and during the measurements. In the
case of condensed humidity the measuring system must dry and it can take several hours
or even few days to recover
EN - 15
HT7052
6.2 GUARD TERMINAL
The purpose of the GUARD terminal is to lead away potential leakage currents (e.g.
surface currents), which are not a result of the measured insulation material itself but are a
result of the surface contamination and moisture. This current interferes with the
measurement i.e. the Insulation Resistance result is influenced by this current. The
GUARD terminal is internally connected to the same potential as the negative test terminal
(black one). The GUARDs test clip should be connected to the test object so as to collect
most of the unwanted leakage current (see Fig. 11)
Fig. 11: Principle scheme relative to the Guard terminal
where:
Ut ..................... Test voltage
IL ...................... Leakage current (resulted by surface dirt and moisture)
IM ...................... Material current (resulted by material conditions)
IA ...................... Test current
Result without GUARD terminal: RINS = Ut / IA = Ut / (IM + IL)  Incorrect result
Result using GUARD terminal: RINS = Ut / IA = Ut / IM  correct result
The GUARD terminal it is internal connected at the same negative test lead (black). The
alligator clip should be connected to the object on test in way to detect the most possible
leakege current (see Fig. 12)
Fig. 12: Connection of the Guard terminal to the object on test
CAUTION
 It is recommended to use the GUARD connection when high insulation
resistance (> 10G) should be measured
 The guard terminal is protected by an internal impedance 400k
 The instrument has two guard terminals to allow easy connection of
shielded measuring leads
EN - 16
HT7052
6.3 USE OF INTERNAL FILTERS
Filters are built in to reduce the influence of noise on measurement results. This option
enables more stable results especially when dealing with high Insulation Resistances
(Insulation Resistance, Diagnostic Test, Step Voltage). In these functions, the status of the
filter option is shown in the top right corner of the LCD screen. The below table contains a
definition of the individual filter options
Filter options
Description
Fil0
Low pass filter with cut off frequency of 0.5 Hz in signal line
Additional low pass filter with cut off frequency of 0.05 Hz in
Fil1
the signal line
Fil2
Fil1 with increased integrating time (4 s)
Fil3
Fil2 with additional cyclic averaging of 5 results
Table 2: Filter options
6.3.1 The purpose of filtering
The internal filters smooth the measured currents by means of averaging and bandwidth
reduction. There are various sources of disturbance:
 AC currents at the mains frequency and its harmonics, switching transients etc, cause
the results to become unstable. These currents are mostly cross talk through insulation
capacitances close to live systems
 Other currents induced or coupled in the electromagnetic environment of the insulation
under test
 Ripple current from internal high voltage regulator,
 Charging effects of high capacitive loads and / or long cables.
Voltage changes are relatively narrow on high resistance insulation, so the most important
point is to filter the measured current
CAUTION
 Any of the selected filter options increases the settling time with Fil1 to 60
s, Fil2 to 70 s, and Fil3 to 120s
 It is necessary to pay close attention to the selection of time intervals when
using the filters
 The recommended minimum measuring times when using filters are the
settling times of the selected filter option
Example:
A noise current of 1mA/50Hz adds approximately 15% distribution to the measured result
when measuring 1G.
 By selecting FIL1 option the distribution will reduce to less than 2 %
 In general using FIL2 and FIL3 will further improve the noise reduction
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6.4
VOLTAGE MEASUREMENT
CAUTION
Maximum input for DC or AC voltage is 600V. Do not attempt to take any
voltage measurement that exceeds the limits. Exceeding the limits could
cause electrical shock and damage the instrument
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “VOLTAGE” on main menu and confirm with
SELECT key. The screen of Fig. 13 is shown by the meter
Fig. 13: Initial screen of voltage measure
Fig. 14: Screen of measured value
3. Connect the red part of the Test lead 1 or Test leads 2 (see § 4.2) to the +OUTPUT
input and the black part of the Test leads 2 (see § 4.2) to the –OUTPUT input
4. Connect the tip of Test lead 1 or Test leads 2 (positive) and the black cable of Test
leads 2 (negative) to the object on test respect the polarities for DC voltage
measurement (see Fig. 15)
Fig. 15: Connection of meter for voltage measurement
5. Press START/STOP key to activate the measurement in continuous mode
6. Press again the START/STOP to stop the measurement. The result of test is shown at
display (see Fig. 14)
7. For saving the result see § 7
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6.5 INSULATION RESISTANCE MEASUREMENT
6.5.1 Setting of parameters
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “INSULATION RESISTANCE” on main menu
and confirm with SELECT key. The screen of Fig. 16 is shown by the meter. In case of
activation of Graphic R(t) option press arrow keys  or  to select the graphical
screen of Fig. 17
Fig. 16: Initial numerical screen
Fig. 17: Initial graphical screen
3. Press again the SELECT key to enter in the setup parameters section. The screen of
Fig. 18 is shown by the meter
4. Use the arrow keys  or  for the selection of parameters. The herewith Table 3
shows the meaning of the measurement parameters
5. Set the values by using the arrow keys  or . Press SELECT key to select possible
sub-parameters and repeat the settings
6. To activate the graphical screen the parameter Graph R(t) should be ON and the Timer
must be activated (see Fig. 18). The time duration of graphical function is
correspondent to the value of set Timer
7. The Timer value could be very long (up to 30 minutes), so the special automatic
decimation algorithm (LOG) is use to write the Graph R(t) at display (see Fig. 19)
8. The cursors of the Graph R(t) could be activated with  key at the end of
measurement. The cursors of the Graph R(t) could be moved with  or  keys
9. Press ESC key to save the settings and back to the measurement screen or the
START/STOP key to exit from the settings menu and activate the test
Parameter
Unominal
Timer
Timer ON/OFF
Time 1
Graph R(t)
R(t)
R(t) Type
Description
Set test voltage – Range 500V10kV step 25V
Duration of the measurement
ON: timer activated, OFF timer disabled
Time to accept and display first Rmin and Rmax results
Enable/Disable Graph R(t)
Set of minimum and maximum values of R(t) for graphical
screen
Set of “LIN” (linear) o “LOG” algorithm of graphical screen
Table 3: Setting of internal parameters
CAUTION
Timer and Time1 are independent timers. Maximum time for each of them is
30 min 60s
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Fig. 18: Setting parameters
Fig. 19: Setting of graph R(t) parameters
6.5.2 Perform the measurement
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “INSULATION RESISTANCE” on main menu
and confirm with SELECT key. The screen of Fig. 20 is shown by the meter. In case of
activation of Graphic R(t) option press arrow keys  or  to select the graphical
screen of Fig. 22
CAUTION
It is not possible to switching mode of presentation when measurement
running
Fig. 20: Initial numerical screen
Fig. 21: Numerical screen of result
Fig. 22: Initial graphical screen
Fig. 23: Graphical screen of result
3. Connect the red part of the Test lead 1 or Test leads 2 (see § 4.2) to the +OUTPUT
input and the black part of the Test leads 2 (see § 4.2) to the –OUTPUT input
4. Connect the tip of Test lead 1 or Test leads 2 (positive) and the black cable of Test
leads 2 (negative) to the object on test (see Fig. 24)
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Fig. 24: Connection of instrument for insulation measurement
5. Press START/STOP key to activate the measurement in continuous mode
6. Wait for a stable result at display and press again START/STOP key to stop the
measurement or wait for the end of the set Timer. The result of test is shown at display
(see Fig. 21 or Fig. 23) with meaning of items descript in Table 4
7. Wait for the object under test to discharge
8. For saving the result see § 7
Parameter at display
Description
Filter type enabled, see the chapter 5.3. Configuration
Fil0 (Fil1, Fil2, Fil3)
(see § 6.3)
Set test voltage
5000V
U=5323V
Applied test voltage
I=266nA
Applied test current
Result of insulation measurement
19.9G
C=0.0nF
Capacitance of measured object
Tm:01min 04s
Timer information – test duration
Bargraph
Analogue representation of result
Maximum value of result (only if timer is enabled)
Rmax=20.G
Minimum value of result (only if timer is enabled)
Rmin=19.9G
Table 4: Meaning of parameters of insulation measurement
CAUTION
 If the timer is disabled then OFF is displayed instead of the timer value
 During a measurement, the timer information displays the time needed to
the complete the measurement (tr) while after the completion the test
duration (tm) is displayed
 A high-voltage warning symbol appears on the display during the
measurement to warn the operator of a potentially dangerous test voltage
 Value of capacitance is measured during the final discharge of the test
object
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HT7052
6.6 DIAGNOSTIC TEST
6.6.1 Setting of parameters
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “DIAGNOSTIC TEST” on main menu and
confirm with SELECT key. The screen of Fig. 25 is shown by the meter. In case of
activation of Graphic R(t) option press arrow keys  or  to select the graphical
screen of Fig. 26
Fig. 25: Initial numerical screen
Fig. 26: Initial graphical screen
3. Press again the SELECT key to enter in the setup parameters section. The screen of
Fig. 27 is shown by the meter
4. Use the arrow keys  or  for the selection of parameters. The herewith Table 3
shows the meaning of the measurement parameters
5. Set the values by using the arrow keys  or . Press SELECT key to select possible
sub-parameters and repeat the settings
6. To activate the graphical screen the parameter Graph R(t) should be ON and the Timer
must be activated (see Fig. 27). The time duration of graphical function is
correspondent to the value of set Time3
7. The Timer value could be very long (up to 30 minutes), so the special automatic
decimation algorithm (LOG) is use to write the Graph R(t) at display (see Fig. 28)
8. The cursors of the Graph R(t) could be activated with  key at the end of
measurement. The cursors of the Graph R(t) could be moved with  or  keys
9. Press ESC key to save the settings and back to the measurement screen or the
START/STOP key to exit from the settings menu and activate the test
Parameter
Unominal
Time1
Time2
Time3
DD ON/OFF
Graph R(t)
R(t)
R(t) Type
Description
Set test voltage – Range 500V10kV step 25V
Time to take R1min result
Time to take R1min result and calculate DAR
Time to take R3min result and calculate PI
ON: DD enabled, OFF: DD disabled
Enable/Disable Graph R(t)
Set of minimum and maximum values of R(t) for graphical
screen
Set of “LIN” (linear) o “LOG” algorithm of graphical screen
Table 5: Setting of internal parameters
CAUTION
Time1  Time2  Time3 are timers with the same start point. The value of
each presents the duration from the start of the measurement. The maximum
time is 30 min
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Fig. 27: Setting parameters
Fig. 28: Setting of graph R(t) parameters
6.6.2 Perform the measurement
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “DIAGNOSTIC TEST” on main menu and
confirm with SELECT key. The screen of Fig. 29 is shown by the meter. In case of
activation of Graphic R(t) option press arrow keys  or  to select the graphical
screen of Fig. 31
CAUTION
It is not possible to switching mode of presentation when measurement
running
Fig. 29: Initial numerical screen
Fig. 30: Numerical screen of result
Fig. 31: Initial graphical screen
Fig. 32: Graphical screen of result
3. Connect the red part of the Test lead 1 or Test leads 2 (see § 4.2) to the +OUTPUT
input and the black part of the Test leads 2 (see § 4.2) to the –OUTPUT input. In case
of use of GUARD terminals (see § 6.2) connect also the green cables to the “GUARD”
input (see Fig. 33)
4. Connect the tip of Test lead 1 or Test leads 2 (positive) and the black cable of Test
leads 2 (negative) to the object on test (see Fig. 33)
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HT7052
Fig. 33: Connection of instrument for diagnostic test
5. Press START/STOP key to activate the insulation measurement
6. Wait for the end of the set Timers. The result of test is shown at display (see Fig. 30 or
Fig. 32) with meaning of items descript in Table 6
7. Wait for the object under test to discharge
8. For saving the result see § 7
Parameter at display
Description
Fil0 (Fil1, Fil2, Fil3)
Filter type enabled on test (see § 6.3)
Set test voltage – step 25 V
5000V
U=5295V
Applied test voltage
I=55.6nA
Applied test current
Result of insulation measurement
95.1G
C=2.1nF
Capacitance of measured object
Bargraph
Analogue representation of Riso result
Resistance value measured after set time 1
R15sec=95.0G
Resistance value measured after set time 2
R01min=95.1G
Resistance value measured after set time 3
R10min=95.1G
DAR=1.00
DAR as ratio of R1min / R15s
PI=1.00
PI as ratio of R10min/R1min
DD=
DD result
Table 6: Meaning of parameters of diagnostic test
CAUTION
 A high-voltage warning symbol appears on the display during the
measurement to warn the operator of a potentially dangerous test voltage
 The value of the capacitance is measured during the final discharge of the
test object
 If enabled, the instrument measures Dielectric Discharge (DD) when the
capacitance is in the range 5nF  50F
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HT7052
6.7 INSULATION RESISTANCE WITH STEP VOLTAGE TEST
6.7.1 Setting of parameters
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “STEP VOLTAGE” on main menu and confirm
with SELECT key. The screen of Fig. 34 is shown by the meter. In case of activation of
Graphic R(t) option press arrow keys  or  to select the graphical screen of Fig. 35
Fig. 34: Initial numerical screen
Fig. 35: Initial graphical screen
3. Press again the SELECT key to enter in the setup parameters section. The screen of
Fig. 36 is shown by the meter
4. Use the arrow keys  or  for the selection of parameters. The herewith Table 7
shows the meaning of the measurement parameters
5. Set the values by using the arrow keys  or . Press SELECT key to select possible
sub-parameters and repeat the settings
6. To activate the graphical screen the parameter Graph R(t) should be ON and the Timer
must be activated (see Fig. 36). The time duration of graphical function is
correspondent to the value of Step Timer multiplied by 5
7. The Timer value could be very long (up to 150 minutes), so the special automatic
decimation algorithm (LOG) is use to write the Graph R(t) at display (see Fig. 37)
8. The cursors of the Graph R(t) could be activated with  key at the end of
measurement. The cursors of the Graph R(t) could be moved with  or  keys
9. Press ESC key to save the settings and back to the measurement screen or the
START/STOP key to exit from the settings menu and activate the test
Parameter
Unominal
Step time
Graph R(t)
R(t)
R(t) Type
Description
Set test voltage – Range 2kV10kV step 125V
Duration of measurement per step
Enable/Disable Graph R(t)
Set of minimum and maximum values of R(t) for graphical
screen
Set of “LIN” (linear) o “LOG” algorithm of graphical screen
Table 7: Setting of internal parameters
Fig. 36: Setting parameters
Fig. 37: Setting of graph R(t) parameters
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HT7052
6.7.2 Perform the measurement
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “STEP VOLTAGE” on main menu and confirm
with SELECT key. The screen of Fig. 38 is shown by the meter. In case of activation of
Graphic R(t) option press arrow keys  or  to select the graphical screen of Fig. 40
CAUTION
It is not possible to switching mode of presentation when measurement
running
Fig. 38: Initial numerical screen
Fig. 39: Numerical screen of result
Fig. 40: Initial graphical screen
Fig. 41: Graphical screen of result
3. Connect the red part of the Test lead 1 or Test leads 2 (see § 4.2) to the +OUTPUT
input and the black part of the Test leads 2 (see § 4.2) to the –OUTPUT input
4. Connect the tip of Test lead 1 or Test leads 2 (positive) and the black cable of Test
leads 2 (negative) to the object on test (see Fig. 24)
Fig. 42: Connection of instrument for insulation measurement
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HT7052
5. Press START/STOP key to activate the insulation measurement
6. Wait for the end of the set Timers. The result of test is shown at display (see Fig. 39 or
Fig. 41) with meaning of items descript in Table 8
7. Wait for the object under test to discharge
8. For saving the result see § 7
Parameter at display
Description
Fil0 (Fil1, Fil2, Fil3)
Filter type enabled (see § 6.3)
Set test voltage – step 125 V
5000V
U=5302V
Applied test voltage
I=133nA
Applied test current
Result of insulation measurement
39.7G
C=0.0nF
Capacitance of measured object
Tm:05min 00s
Actual test duration
Last result of 1st step
R1000V=40.0G
Last result of 2nd step
R2000V=40.0G
Last result of 3rd step
R3000V=40.0G
Last result of 4th step
R4000V=39.8G
Last result of 5th step
R5000V=39.7G
U1=1076V
1st step voltage
U2=2141V
2nd step voltage
U3=3238V
3rd step voltage
U4=4278V
4th step voltage
U5=5302V
5th step voltage
Table 8: Meaning of parameters of insulation measurement with step voltage
CAUTION
 Timer information is displayed from the start of the measurement until the
completion of each step measurement
 A high-voltage warning symbol appears on the display during the
measurement to warn the operator of a potentially dangerous test voltage
 The value of the capacitance is measured during the final discharge of the
test object
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6.8 WITHSTANDING VOLTAGE TEST
6.8.1 Setting of parameters
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “WITHSTANDING VOLTAGE DC” on main
menu and confirm with SELECT key. The screen of Fig. 43 is shown by the meter
Fig. 43: Initial screen withstanding test
Fig. 44: Final screen withstanding test
3. Press again the SELECT key to enter in the setup parameters section. The screen of
Fig. 45 is shown by the meter
Fig. 45: Setting parameters
4. Use the arrow keys  or  for the selection of parameters. The herewith Table 9
shows the meaning of the measurement parameters
5. Set the values by using the arrow keys  or . Press SELECT key to select possible
sub-parameters and repeat the settings
6. Press ESC key to save the settings and back to the measurement screen or the
START/STOP key to exit from the settings menu and activate the test
Parameter
Ustart
Ustop
Itrigg
Tstep
Tend
Description
Start test voltage – Range 500V10kV step 25V
Stop test voltage – Range 500V10kV step 25V
Set trigger leakage current – Range 0.001mA  5mA step 10A
Duration of test voltage per one step
Duration of constant test voltage after reaching stop value
Table 9: Setting of internal parameters
CAUTION
 Tstep and Tend are independent timers. The maximum time for each timer
is 30 min 60 s. Tend begins after the completion of the ramp period. Ramp
period can be calculated from:
Ttot-ramp  Tstep * [(Ustop-Ustart) / 25V]
 If Tstep is set to 00min 00s, then the ramp voltage increases by
approximately 25 V every 2s
EN - 28
HT7052
6.8.2 Perform the measurement
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “WITHSTANDING VOLTAGE DC” on main
menu and confirm with SELECT key. The screen of Fig. 43 is shown by the meter
3. Connect the red part of the Test lead 1 or Test leads 2 (see § 4.2) to the +OUTPUT
input and the black part of the Test leads 2 (see § 4.2) to the –OUTPUT input
4. Connect the tip of Test lead 1 or Test leads 2 (positive) and the black cable of Test
leads 2 (negative) to the object on test (see Fig. 46)
Fig. 46: Connection of instrument for withstanding test
5. Press START/STOP key to activate the measurement
6. Wait until the set timers run out or until breakdown occurs. The result of test is shown
at display (see Fig. 44) with meaning of items descript in Table 10
7. Wait for the object under test to discharge
8. For saving the result see § 7
Parameter at display
Description
Start test voltage
2000V
Stop test voltage
7000V
Applied test voltage
7221V
I=0.002mA
Measured leakage current
Tm:01min 00s
Timer information
Table 10: Meaning of parameters of withstanding test
CAUTION
 Breakdown is detected when the measured current reaches or exceeds the
set current level Itrigg (see § 6.8.1)
 The timer shows the time needed to complete each step during the
measurement and it shows the total measurement period after the
completion of the measurement
 A high-voltage warning symbol appears on the display during the
measurement to warn the operator of a potentially dangerous test voltage
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HT7052
7 MANAGEMENT OF MEMORY DATA
7.1
SAVING, RECALL AND CLEAR MEASUREMENT RESULTS
SAVING DATA
1. With measurement result displayed press MEM key. The screen of Fig. 47 is shown by
the instrument
SAVE
CLR
RCL
nnnn
Fig. 47: Saving data
2. Use the arrow keys  or  and select the “MEM” option. The “nnnn” number shows
the memory location where the data will be saved
3. Press again MEM key to confirm the operation. A double acoustic signal is given by the
instrument
RECALL SAVED DATA
1. Press MEM key, use the arrow keys  or  to select the “RCL” option and confirm
again with MEM key. The last saved data is shown at display
2. Use the arrow keys or  to select and display the saved data correspondent to the
previous memory locations
3. The recalled data with “G” indication means the presence of a graphical screen more
than the numerical. Press SELECT key to display the graphical screen and ESC to
return to the numerical one
4. Press ESC key to exit from the function and return in measurement mode
CLEAR RESULT
1. For clear all internal memory select the “Memory clear” parameter (see § 5.2), press
SELECT key and confirm with MEM key
2. Press ESC key to exit from the function
3. For clear the last saved result press MEM key, use the arrow keys  or  to select the
“CLR” option and confirm again with MEM. A double acoustic signal is given by the
instrument to confirm the operation
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HT7052
8 CONNECTION OF THE INSTRUMENT TO PC
The saved data can be transferred to PC by using the TeraView dedicated software
included with instrument
TeraView software permits the herewith operations:





Download data from meter
Define customized settings on the final report
Analyze the results of measurements in numerical and graphical screens
Print the final report
Export the data in text (TXT) format file
MINIMUM SYSTEM REQUIREMENTS
Pentium III – 500MHz
512 MB RAM
100 MB free space on HD
CD-ROM reader
USB/serial port
Video resolution 800x600
Windows systems: Win2k/XP/Vista/Win7 32 bit and 64 bit platforms
8.1 INSTALLATION OF SOFTWARE AND INITIAL CONFIGURATIONS (WIN XP)
1. Close all the open application on the PC
2. Insert the supplied CD-ROM in the PC reader
3. Launch the “TeraView.exe” file included on CD-ROM and follow the steps to correctly
install the TeraView software
4. Switch on the instrument, set the USB mode (see § 5.2) and connect it to the PC by
using the supplied USB cable
5. Read the “Instal_USB_neutral.pdf” file inside the “Handbook” folder for the installation
of USB driver on the PC
6. Launch the TeraView software
7. Select the command “Config  Password…”, type the serial number of meter and the
password (which is indicated on the CD-ROM label) and confirm with “Add” (see Fig.
48)
Fig. 48: Insertion of initial password
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HT7052
8. Select the “Config  COM Port…” command and click on the “AutoFind” button to
start the automatic detection of the instrument (see Fig. 49)
Fig. 49: Connection of the instrument to PC
9. The herewith message means a correct detection of meter by the PC
Fig. 50: Correct detection of instrument
10. In case of failed detection of the meter by the PC it should be necessary to re-configure
the “virtual” COM serial port associated the USB driver previously installed. The
TeraView program can detect automatically serial ports from the COM1 to the COM16.
Follow the herewith steps to modify the COM associated to USB driver:
 Right click of mouse on the “My computer” icon on the PC desktop and selection of
“Properties” item
 “Hardware” folder  “Device Manager”  “Ports (COM & LPT)
 Move on the “USB CDC Serial Port Emulation (COMxx)” item  right click 
“Properties”
 Select “Port Settings”  “Advanced…”
 In the COM Port Number list select a “COMxx” among COM1 and COM16
 Confirm all operations, come back to software TeraView and repeat the AutoFind
For any information about the use of TeraView software refer to the help on line of
the same program
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HT7052
9 MAINTENANCE
9.1 GENERAL INFORMATION
The instrument You purchased is a precision instrument. During use and storage, carefully
observe the recommendations listed in this manual in order to prevent possible damage or
dangers during use. Do not use the instrument in environments with high humidity levels or
at high temperatures. Do not directly expose to sunlight. Always turn off the instrument
after use. Never remove the front panel of the instrument. The instrument don’t need any
particular maintenance
9.2 REPLACEMENT AND CHARGING BATTERIES
The instrument is power-supplied through internal rechargeable batteries which are
recharged from the mains by means of a battery charger integrated in the instrument itself.
The symbol “
“ illuminated in the left bottom part indicates that the batteries are flat
and must be recharged
CAUTION
 Connect the instrument to the mains power supply for 20 hours to fully
charge batteries. (typical charging current is 600mA). When you charge the
batteries for the first time, it normally takes about 3 charge and discharge
cycles for the batteries to regain full capacity
 The operator does not need to disconnect the instrument from mains
supply after the full recharging period. The instrument can be connected
permanently
 The instrument will only work when rechargeable batteries are inside the
instrument
In case of batteries replacement follow the herewith steps:
CAUTION
Nominal power supply voltage is 7.2 V DC. Use only six NiMH cells with
size equivalent to IEC LR20 (diameter = 33 mm, height = 58 mm)
1. Turn the power off and disconnect any measurement accessories or mains supply
cable connected to the instrument before opening the battery cover to avoid electric
shock
2. Remove the two screws (see Fig. 1 – Part 15) and open the battery cover
3. Replace all the six batteries with others of the same type respecting the indicated
polarity
4. Restore the battery cover
5. Use the appropriate battery disposal methods for your area
9.3 CLEANING THE INSTRUMENT
To clean the instrument, use a soft dry cloth. Never use humid cloths, solvents, water, etc
9.4
END OF LIFE
Warning: the reported symbol indicates that the appliance, the batteries and its
accessories must be disposed of separately and treated correctly
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HT7052
10 TECHNICAL SPECIFICATIONS
Accuracy is given as [%rdg + (number of dgt) * resolution] at reference indicated in § 0
INSULATION RESISTANCE MEASUREMENT
Measurement range
120k  999k
1.00M  9.99M
10.0M  99.9M
100M  999M
1.00G  9.99G
10.0G  99.9G
100G  999G
1.00T  10.00T
Resolution
1k
0.01M
0.1M
1M
0.01G
0.1G
1G
0.01T
FS value of insulation resistance is defined as:
Nominal test voltage:
Current capability of test generator:
Short-circuit test current:
Automatic discharge of tested object:
RFS = 1G * Utest [V]
500  10kV DC
> 1mA
5mA  10%
yes
Measurement range test voltage
0  9999V
 10kV
Resolution
1V
0.1kV
Accuracy
(5.0rdg + 3dgt)
(15.0 rdg + 3 dgt)
Accuracy
(3.0 rdg + 3V)
3.0 rdg
500  10kV DC programmable in step of 25V
-0 / +10% + 20V
10W max
Nominal test voltage:
Accuracy of test voltage:
Output power:
Measurement range test current
0.00  9.99nA
10.0  99.9nA
100  999nA
1.00  9.99A
10.0  9.99A
100  999A
1.00  5.50mA
Resolution
0.01nA
0.1nA
1nA
0.01A
0.1A
1A
0.01mA
Noise current rejection (resistive load)
Filter option
Fil0
Fil1
Fil2
Fil3
Accuracy
(5.0 rdg + 0.05nA)
Maximum current @ 50Hz (mA rms)
1.5
2.5
4.5
5
Diagram Test voltage – Resistance
12
10
[ kV ]
8
6
4
2
0
0,1
1
10
[M
]
Utes t=10k V
EN - 34
Utest=5k V
100
HT7052
DAR, PI, DD MEASUREMENT
Measurement range
0.01  9.99
10.0  100.0
Capacitance range for DD test:
Resolution
0.01
0.1
Accuracy
(5.0 rdg + 2 dgt)
5.0 dgt
5nF  50F
INSULATION MEASUREMENT WITH STEP VOLTAGE
Measurement range test voltage
2000  9999V
 10kV
Nominal test voltage:
Accuracy of test voltage:
Resolution
1V
0.1kV
Accuracy
(3.0 rdg + 3V)
3.0 rdg
2000  10kV DC programmable in steps of 125V
-0 / +10% + 20V
WITHSTANDING VOLATGE DC
Measurement range test voltage
500  9999V
 10kV
Resolution
1V
0.1kV
Accuracy
(3.0 rdg + 3V)
3.0 rdg
Measurement range leakage current
0.000  0.009mA
0.01  5.50mA
Resolution
0.001mA
0.01mA
Accuracy
(3.0 rdg + 3 dgt)
3.0 rdg
Nominal test voltage:
Accuracy of test voltage:
500  10kV DC programmable in steps of 25V
-0 / +10% + 20V
AC or DC VOLTAGE
Measurement range
0  600V
Input impedance:
Voltage frequency
0 e 45.0  65.0Hz
Frequency within 0 and 45Hz:
Frequency > 65Hz:
Resolution
1V
Accuracy
(3.0 rdg + 4V)
3M 10%
Resolution
0.1Hz
Accuracy
0.2Hz
displayed < 45Hz
displayed > 65Hz
CAPACITANCE
Measurement range
0.0  99.9nF
100  999nF
1.00  50.0F
Resolution
0.1nF
1nF
0.01F
Accuracy
(5.0 rdg + 2 dgt)
Full-scale value of capacitance is defined as:
CFS = 10F * Utest [kV]
10.1 SAFETY STANDARDS
Instrument safety:
Measuring accessory safety:
Insulation:
Protection:
Polluting level:
Overvoltage category:
Maximum altitude:
IEC/EN61010-1, IEC/EN61557-2
IEC/EN61010-031
double insulation
IP44 (closed case)
2
CAT IV 600V (to earth), max 600V between inputs
2000m (6561ft)
EN - 35
HT7052
10.2 GENERAL CHARACTERISTICS
Mechanical characteristics
Dimensions (LxWxH):
360 x 330 x 160mm; 14 x 13 x 6in
Weight (with batteries):
5.5kg; 11lv
Power supply
External supply:
Internal supply:
Low battery indication:
Battery life:
90-260V AC, 45-65Hz, 60VA
6x1.2V rechargeable NiMH battery IEC LR20
symbol “
“ at display
approx 4 hours (continuous test on 10kV)
Display
Characteristics:
LCD, dot matrix, with backlight (160x116pxl)
Memory
Characteristics:
1000 memory locations
Discharging
Characteristics:
each time after the end of test; resistance 425
10%
Connection to PC
RS-232 serial interface:
USB interface:
optoinsulated (2400,4800,9600,19200 baud, 1, N)
type B standard, 115000 baud
10.3 ENVIRONMENT
Reference temperature:
Reference humidity:
Operating temperature:
Operating humidity:
Storage temperature:
Storage humidity:
10°C ÷ 30°C; 50°F ÷ 86°F
40%RH ÷ 60%RH
-10°C ÷ 50°C; 14°F ÷ 122°F
<90%HR
-20°C ÷ 70°C; -4°F ÷ 158°F
<90%HR
This instrument complies with the requirements of European Directive on low
voltage 2006/95/EC (LVD) and of Directive EMC 2004/108/EC
10.4 ACCESSORIES
 N 1 Test lead red, protection 10kV, 2m
 N 2 Test leads (red/black), basic protection 10kV (double protection 5kV), 2m
 N 2 Alligator clips (red/black), basic protection 10kV (double protection 5kV)
 N 1 Guard test lead green
 N 1 Guard alligator clip green
 N 1 Mains cord
 N 1 USB cable
 N 1 RS-232 cable
 “TeraView” software on CD-ROM
 6x1.2V rechargeable batteries NiMH type IEC LR20
 User manual
 ISO9000 calibration certificate
EN - 36
HT7052
11 SERVICE
11.1 WARRANTY CONDITIONS
This instrument is warranted against any material or manufacturing defect, in compliance
with the general sales conditions. During the warranty period, defective parts may be
replaced. However, the manufacturer reserves the right to repair or replace the product
Should the instrument be returned to the After-sales Service or to a Dealer, transport will
be at the Customer's charge. However, shipment will be agreed in advance
A report will always be enclosed to a shipment, stating the reasons for the product’s return
Only use original packaging for shipment; any damage due to the use of non-original
packaging material will be charged to the Customer
The manufacturer declines any responsibility for injury to people or damage to property
The warranty shall not apply in the following cases:
 Repair and/or replacement of accessories and battery (not covered by warranty)
 Repairs that may become necessary as a consequence of an incorrect use of the
instrument or due to its use together with non-compatible appliances
 Repairs that may become necessary as a consequence of improper packaging
 Repairs which may become necessary as a consequence of interventions performed
by unauthorized personnel
 Modifications to the instrument performed without the manufacturer’s explicit
authorization
 Use not provided for in the instrument’s specifications or in the instruction manual
The content of this manual cannot be reproduced in any form without the manufacturer’s
authorization.
Our products are patented and our trademarks are registered. The manufacturer
reserves the right to make changes in the specifications and prices if this is due to
improvements in technology
11.2 SERVICE
If the instrument does not operate properly, before contacting the After-sales Service,
please check the conditions of battery and cables and replace them, if necessary
Should the instrument still operate improperly, check that the product is operated
according to the instructions given in this manual
Should the instrument be returned to the After-sales Service or to a Dealer, transport will
be at the Customer's charge. However, shipment will be agreed in advance
A report will always be enclosed to a shipment, stating the reasons for the product’s return
Only use original packaging for shipment; any damage due to the use of non-original
packaging material will be charged to the Customer
EN - 37
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