3156 LEAK CURRENT HiTESTER
Safety Standards
Measuring Instruments
The Long-Awaited Bench-type Model Is Here
!
Leakage Current Measurement Essential
for Electrical Safety
Because of the risks it poses, many standards stipulate leak
current test methods, the performance of test equipment, limits
for leak current, and other factors related to leak current. The
bench-type 3156 LEAK CURRENT HiTESTER by itself, without
any additional equipment, is capable of performing tests that
comply with standards for a wide range of equipment, from
general purpose electrical equipment to medical electrical
equipment. The 3156 also is equipped with functions and an
interface that support embedded test lines.
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1
Automatically compatible with Networks
stipulated by IEC/UL/JIS standards
In order to avoid dangers such as electric shock,
electrical equipment is designed so that those
portions that are likely to be touched by people
are insulated from the power source. However,
the insulation resistance is not infinite, so there is
always some leak current present. Furthermore,
the extent of the leak current changes over time
as the insulation deteriorates. To determine their
safety level, the 3156 LEAK CURRENT HiTESTER
can prove to be highly valuable, both as a tester
on the production line as well as a maintenance
and inspection tool.
Main Features
s
Standard support for a variety of Networks
The 3156 is engineered to automatically support the
"Networks" (human simulated resistance) stipulated by
the various international safety standards. Switch
between Networks or use the filters using a PC.
s
Measurement that complies with standards
The 3156 by itself can measure leak current in compliance
with IEC, UL, and JIS standards.
s
Automatic measurement function
The 3156 is capable of automatically measuring power
supply polarity switching as well as the normal state/single
failure state, and can display the maximum values. The
measurement time and the wait time can be set by the user.
s
RS-232C, GP-IB, and EXT I/O interfaces
standard
Because the 3156 is equipped with several standard
interfaces, it is easy to set up for automatic inspection on
a production line, etc. In addition, the RS-232C port can
be used to connect the optional 9442 Printer for easy
print-outs.
s
Stores data for 100 units
The 3156 can store data such as equipment name, control
number, ground class, and measured values for up to 100
pieces of equipment being tested.
s
Save up to 30 sets of measuring conditions
The 3156 can save and load up to 30 different sets of
measuring conditions, and can switch between different
sets quickly.
s
Power supply separation
The power supply for the 3156 is separate from the line
power supply of the equipment being tested, preventing
damage to equipment due to wrong supply voltage being
input.
Simple operation in an interactive format
The 3156 is equipped with a touch panel that can
be used to make settings simply by touching the
items to be selected on the display, making
operation even more simple.
110% voltage application terminals
The 110% voltage application terminals are used when testing
medical equipment. It outputs on a 1:1 basis the voltage that is
supplied to the line power supply for the equipment being
tested. The polarity of the connectors can be switched.
Measurement mode
Breaker for equipment being tested
Since the 3156 is a bench-type unit that is suited
embedded test lines, it is equipped with a terminal
board and breaker on the front panel, allowing
test equipment to be easily connected to the 3156
even when it is rack mounted.
General
equipment
Medical
equipment
q
Leakage current between enclosure and line
q
Leakage current between enclosure and earth
q
Leakage current between enclosure and enclosure
q
Earth leakage current
q
Patient leakage current I
q
Patient leakage current II
q
Patient leakage current III
q
Patient auxiliary current
2
Based on the settings for the Network and
the equipment being tested, the 3156 displays
the appropriate measurement mode. The
state of the settable keys can be seen at a
glance. All settings can be made by selecting
the appropriate items or values.
[Initial screen]
s
Wiring check functions
The 3156 performs polarity
checks and VA checks.
s
Support for proprietary networks
When making measurements on a proprietary network that is
not built into the 3156, the
3156 can be used as a true
effective value ammeter in the
1MHz band.
s
Browsing saved data
The 3156 allows the user to
browse all saved data. Saved
data can also be printed out
or downloaded to a computer.
[System screen]
Result of evaluation against tolerance setting
Maximum value display
Displays the power supply failure status
and the maximum value for the leak current
as it fluctuates due to the operation of the
equipment being tested.
Power supply polarity/equipment
status/measured current
Current measured value
Data storage
Measurement data: For up to 100 units
Measuring conditions: Up to 30 sets
Allowable value
The upper limit for tolerance is set according
to the standard. The set value can be changed
freely, if necessary.
[Measurement screen]
Single failure setting
The single failure status can be set for
individual items in automatic testing, with
continuous testing performed automatically
only for the items for which the single failure
setting was made. In addition, the wait time
and measurement time can also be set.
3
Leak current measurement
for general equipment
The network (human simulated resistance) is
specified separately in each standard, and when
taking measurements a network that is suited to
the standards is needed. The 3156 is pre-engineered
with basic Networks that correspond to each
standard.
IEC standard
[ IEC 60990, others ]
UL standard
[ UL471, UL1310, UL1437, others ]
JIS standard
[ JIS B8561, others ]
The standard numbers that are listed are only examples.
The networks listed below can be used with all applicable
standards.
Network types
For JIS standards
For IEC60990s
1.5kΩ
±0.1%
1kΩ
±0.1%
500Ω
±0.1%
0.22µF
±1%
For UL standards
1.5kΩ
±0.1%
0.15µF
±2%
Basic measuring element
Basic measuring element
Basic measuring element
10kΩ±0.1%
11.22nF
±1%
1.5kΩ
±0.1%
0.22µF±1%
10kΩ±0.1%
0.022
µ
F
±
1
%
General purpose 1
1kΩ
±0.1%
579Ω
±1%
1kΩ
±0.1%
500Ω
±0.1%
Filter on
Basic measuring element
Filter 1 on
1.5k
Ω
±
0.1
%
General purpose 2
0.22
µ
F
±
1
%
10k
Ω±
0.1
%
20k
Ω
±
0.1
%
500
Ω
±
0.1
%
0.0062
µ
F
±
1
%
2kΩ
±0.1%
0.0091
µ
F
±
1
%
Filter 2 on
Basic measuring element
4
Leak current measurement
for medical equipment
Medical equipment leak current includes not only
ground leak current and exterior leak current, but
also patient leak current (I to III) and patient
measured current. The 3156 can measure all of
these different types of leak current without any
additional equipment.
IEC standard
[ IEC 60601-1 ('88) + am1 ('91) + am2 ('95) ]
UL standard
[ UL 2601-1, others ]
The 3156 does not have a built-in
insulated transformer. When
measuring
medical equipment, use a step-up insulated transformer or other
device to provide 110% of the rated voltage as the line power
supply for the equipment being tested.
The standard numbers that are listed are only examples. The
JIS standard
[ JIS T 0601-1, others ]
Leak current types and Network types
For medical equipment
Medical equipment leak current types
Faulty medical equipment
Faulty medical equipment
1kΩ
±0.1%
Signal input section
Medical equipment
Patient leakage
current III
Patient leakage
current II
Basic measuring element
Patient leakage
current I
Earth leakage current
10kΩ±0.1%
1kΩ
±0.1%
Enclosure leakage
current
0.015µF
±1%
Earth leakage current
A current flowing from the power supply through the interior or surface of
the insulation to the protective ground line.
Filter on
Enclosure leakage current
A current flowing from a part of the enclosure which during normal use can be
touched by an operator or patient either to ground or to another part of the
enclosure, through an external conductor other than the protective ground.
Patient leakage current
A current flowing from the device through the patient to ground.
Patient auxiliary current
A current flowing between contacts which during
normal use are connected through the patient, with
no intended physiological effect.
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