Fluke 5520A - Connecting the Calibrator to a UUT; Recommended Cable and Connector Types

Front Panel Operation
Connecting the Calibrator to a UUT
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4-12. Connecting the Calibrator to a UUT
WWarning
The 5520A Calibrator is capable of supplying lethal voltages.
Do not make connections to the output terminals when a
voltage is present. Placing the instrument in standby may not
be enough to avoid shock hazard, since the Okey could be
pressed accidentally. Press reset and verify that the STBY
annunciator appears on the Control Display before making
connections to the output terminals.
The outputs labeled NORMAL (HI and LO) are used to source voltages, resistances,
capacitance and simulate resistance temperature detector (RTD) outputs. The LO
terminal connects to the analog signal ground inside the guard shield. This signal line
may or may not be tied to the guard shield and/or to chassis ground, depending on the
settings of the Z and B keys. See “When to Use EARTH and EXGRD” on the
next page for an explanation of these internal connections.
The outputs labeled AUX (HI and LO) source current and low voltages in the dual
voltage function. These outputs are also used for four-wire or remote sensing in the
resistance, capacitance and RTD functions.
When an oscilloscope calibration option is installed, the BNC connectors labeled
SCOPE OUT and TRIG deliver signals for oscilloscope calibration.
The socket labeled TC is used to measure thermocouples and to generate simulated
thermocouple outputs.
4-13. Recommended Cable and Connector Types
WWarning
Using standard banana plugs on the calibrator output will
expose lethal voltages when not completely inserted into a
mating terminal.
To avoid electric shock, use only cables with correct voltage
ratings.
Cables to the calibrator are connected to the NORMAL and AUX terminals. To avoid
errors induced by thermal voltages (thermal emfs), use connectors and conductors made
of copper or materials that generate small thermal emfs when joined to copper. Avoid
using nickel-plated connectors. Optimum results can be obtained by using Fluke Model
5440A-7002 Low Thermal EMF Test Leads, which are constructed of well-insulated
copper wire and tellurium copper connectors. (See Chapter 9, “Accessories.”)