Tektronix STC-37 Screw Terminal Connector Packing List PA-589 Rev. A User manual
STC-37 Screw Terminal Connector
WARNING
This screw terminal connector is not intended for use in circuits carrying voltages in excess of 30V RMS,
42.4V peak, or 60VDC.
Description
The STC-37 provides screw terminals directly at the rear of any data acquisition board having a 37-pin D connector. Each of the
37 pins is connected directly to a screw terminal labeled with the pin number. See Figure 1 below.
Cable clamp
37-pin D connector that
connects directly to the data
acquisition board
Figure 1. Layout of STC-37 screw terminal connector
Specifications
Voltage: 30V RMS, 42.4V peak, or 60VDC
Current: 1A maximum
Screw terminal wire size: 12-22 AWG
Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although some
instruments and accessories would normally be used with non-hazardous 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 possible injury. Read the operating information carefully before using the product.
General safety definitions
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, and for ensuring that operators
PA-589 Rev. A / 3-98
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, for example, setting the line voltage or
replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly trained
service personnel may perform installation and service procedures.
If a grounding screw is present, connect it to safety earth ground using the wire recommended in the user documentation.
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read the associated
information very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the warranty.
Installation safety
As described in the International Electrotechnical Commission (IEC) Standard IEC 664, the signal terminals are Installation Category I and must not be connected to mains.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sources.
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.
Operators and maintainers of this product must be protected from electric shock at all times. The responsible body must ensure that
users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product users in these circumstances must be trained to protect themselves from the risk of electric shock. If the
circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.
Operation safety
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures.
The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS,
42.4V peak, or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit
before measuring.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under 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 object that could provide a current path to the common side of the circuit under test or power line (earth) ground.
Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being
measured.
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.
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