5520A
Operators Manual
4-12
4-18. Cable Connection Instructions
Table 4-1 indicates a figure reference for each type of connection between a UUT and
the 5520A Calibrator, referencing Figures 4-2 through 4-10.
When calibrating Resistance Temperature Detectors (RTDs) using the three-terminal
connection shown in Figure 4-9, be sure the test leads have identical resistances to
cancel any errors due to lead resistance. This can be accomplished, for example, by using
three identical test lead lengths and identical connector styles.
When calibrating thermocouples, it is especially important to use the correct hookup
wire and miniconnector between the Calibrator front panel TC terminal and the UUT.
You must use thermocouple wire and miniconnectors that match the type of
thermocouple. For example, if simulating a temperature output for a type K
thermocouple, use type K thermocouple wire and type K miniplugs for the hookup.
To connect the calibrator to a UUT, proceed as follows:
1. If the calibrator is turned on, press R to remove the output from the calibrator
terminals.
2. Make the connections to the UUT by selecting the appropriate figure from Table 4-1.
For capacitance outputs, null out stray capacitance by connecting the test leads to the
UUT, routing them (but not connecting) to the 5520A Calibrator on a non-
conductive surface. Null out the reading on the UUT using “rel,” “offset,” or “null,”
whichever method applies, and then connect the test leads to the 5520A Calibrator.
Table 4-1. UUT Connections
5520A Output Figure Reference
Resistance
Capacitance
DC Voltage
AC Voltage
DC Current
AC Current
RTD Simulation
Thermocouple Simulation
4-2 Resistance - four-wire compensated
4-3 Resistance - two-wire compensated
4-4 Resistance - compensation off
4-5 Capacitance - two-wire compensated
4-6 Capacitance - compensation off
4-7 DC Voltage/AC Voltage
4-7 DC Voltage/AC Voltage
4-8 DC Current/AC Current
4-8 DC Current/AC Current
4-9 Temperature (RTD)
4-10 Temperature (Thermocouple)
Note: See the discussion under “Four-Wire versus Two-Wire Connections” above.
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