Model 1756 Test Lead Kit
Keithley Instruments
28775 Aurora Road
Cl
eveland, Ohio 44139
1-888-KEITHLEY
http://www.keithley.com
General Purpose Test Lead Information
Description
These test leads allow you to make multiple measurement connections, depending on your testing needs. There
are three different types of probe tips included with the test leads:
• Standard probe (quantity: 2)
• Needle probe (quantity: 2)
• Spring hook (quantity: 2)
Figure 1: Model 1756 General Purpose Test Lead Kit
These test leads should only be used by quali fied personnel who recog nize shock hazards and
are familiar with the safety precautions required to avoid possible injury.
The test lead's ratings may be greater than those of the instrument. Do not exceed the ratings
of the instrument. Also, do not exceed the maximum signal levels of thi s accessory (as defined
in the Characteristics paragraph) or any attached instrument.
Inspect the probes, lead insulation, and insulating sheaths for wear, cracks, or breaks before
each use.
For maximum safety, never touch or change the leads or power connections when power is
applied to the circuit under test.
Always turn off test system power and dischar g e all capacitors before connecting or
disconnecting the leads.
To prevent exposed voltages or shorting between connections, make sure both ends of the
cables are properly connected before applying power.
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Model 1756 Test Lead Kit
Characteristics
Standard probe specifications
Characteristic Specification Category
Maximum voltage 1000 V
Maximum current 20 A
Needle probe specifications
Characteristic Specification Category
Maximum voltage 1000 V III
Maximum voltage 600 V IV
Maximum current 10 A
Spring hook specifications
Characteristic Specification Category
Maximum voltage 1000 V III
Maximum voltage 600 V IV
Maximum current 20 A
II and III
2 071339300 / November 2014
Model 1756 Test Lead Kit
Dimensions
Standard probe:
Figure 2: Model 1756 standard probe dimensions
Needle probe:
Spring hook probe:
Figure 3: Model 1756 needle probe dimensions
Figure 4: Model 1756 spring hook dimensions
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Safety precautions
The following safety precaut ions should be ob served before u sing this product and any associated in strumentation. A lthough so me
instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid pos sible injur y. Read a nd follow all install ation, o peration, an d maintena nce inform ation caref ully bef ore using the
product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to w ork on live circuits, perform safe in stallations, an d repair produ cts. Only proper ly trained serv ice
personnel may perform installation and service procedures.
Keithley Instruments produ cts are designed for use with elect rical signals tha t are measurement, control, and da ta I/O connections,
with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient
overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme c aution w hen a s hock hazard is pres ent. L ethal v olt age m ay be prese nt o n cabl e connect or ja cks or test f ix tures.
The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30 V RMS,
42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit
before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators are
prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human
contact. Product operat ors in these cir cumstances mus t be trained t o protect them selves from the r isk of electri c shock. If t he circuit
is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
Do not connect switching card s directly to unlimited power cir cuit s. T hey ar e inte nded t o be used with impedance-limited s our ces .
NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to
limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the
connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
When installing equipment w here acce ss to the main p ower cord is restr icted, su ch as rack moun ting, a separat e main inp ut pow er
disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the pro duct, test c ables, or any other instr uments while pow er is applied to the circuit un der test.
ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or
jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any ob ject that could provide a current path to t he com mon side of the circuit under test or power lin e ( ear th) gr ou nd .
Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being
measured.
For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating
information, and as shown on the instrument or test fixture panels, or switching card.
When fuses are used in a product, replace with the same type and rating for co nt in ued prot ecti on against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
If you are using a tes t fix ture, keep the li d clo sed w hile power is applied to the d evice under t est. S afe op erati on requ ires th e u se o f
a lid interlock.
If a screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
The symbol on an instrument means caution, risk of danger. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is mark ed on the instru ment .
The symbol on an instrument means caution, r isk of electri c shock. Use stan dard safety precautions to avoid personal contact
with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.
If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be
properly disposed of according to federal, state, and local laws.
The WARNING heading in the user d ocu me ntat ion explains dangers that might result in personal injury or de at h. A lways read the
associated information very carefully before performing the indicated procedure.
The CAUTION heading in the user documentation explains h az ards that coul d dama ge the instrument. Such damage may
invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from e lectric shock and fire, repla ce m ent co mpo nent s in mai ns circ u its — including the power tr ans former,
test leads, and input jacks — must be purchased from Keithley Instruments. Standard fuses with applicable national safety
approvals may be used if the rating and type are the same. Other components that are not safety-related may be purchased fr o m
other suppliers as long as t hey are equivalen t to the original c omponent (note t hat selected p arts should be purc hased only t hrough
Keithley Instruments to maintain accuracy and functionality of the product). If you are unsure about the applicability of a
replacement component, call a Keithley Instruments office for information.
To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the ext erior of the in stru ment only . Do not apply
cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no
case or chassis (e.g., a data acquis ition board for in stallation i nto a comput er) should never r equire clean ing if handled a ccording to
instructions. If the board becomes contaminated and operation is affected, the board should be returned to the factory for proper
cleaning/servicing.
Safety precaution revision as of January 2013.
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