5520A
Operators Manual
4-46
4. The measured temperature appears in the Output Display (below is typical). (The
lower-case m blinks on when a measurement is being taken.)
nn107f.eps
• Meas@TC terminal (Measurement at the front panel TC terminals) Displays the
actual dc voltage at the front panel TC terminals. This is a display only, not a softkey
function.
• TC MENUS (Thermocouple Menus) Opens the submenus supporting thermocouple
outputs.
• Open TCD (Open Thermocouple Detect) Selects on or off for the Open TCD
feature. When Open TCD is on, a small electrical pulse checks for thermocouple
continuity that, in most cases, will have no effect on the measurement. If you are
measuring the thermocouple with the 5520A Calibrator in parallel with another
temperature measuring device, select off for Open TCD. When an open
thermocouple is detected, “Open TC” is displayed in the TC menu, providing
positive identification of the fault.
• UNITS (Temperature Units) Selects °C or °F as the temperature unit.
• REF SRC (Reference Source) Selects intrnl (Internal) or extrnl (External)
temperature reference source. The reference source indicates the ambient
temperature contribution to the thermocouple output, which is taken into account
when simulating an accurate temperature output. Select intrnl when the selected
thermocouple has alloy wires and you are using the isothermal block internal to
the 5520A Calibrator. Select extrnl when using an external isothermal block, and
when the selected thermocouple has copper wires. Press the REF softkey to enter
the value of the external temperature reference.
• REF (Temperature Reference) Displays the value of the temperature reference.
When the Reference Source is Internal, the display shows the internal reference.
When the Reference Source is External, the display shows the value you entered
for external reference.
• OFFSET (Measurement Display Offset) Selects an offset value to be added or
subtracted from the actual measurement. This is useful for differential
measurements (temperatures above and below a desired temperature).
• TYPE (Thermocouple Type) Selects the thermocouple type used for
measurement. The default is K. (The 10µV/°C setting is used for customer-
supplied linearizations. 1 mV/%RH and 1 mV/°C settings are used for the
Vaisala humidity/temperature probes.)
4-35. Waveform Types
AC voltage, ac current, dual ac voltage, and ac power functions provide a softkey to
select between four different waveform types: sine wave (sine), triangle wave (tri),
square wave (square), and truncated sine wave (truncs). When the calibrator output is
sine wave ac power or dual ac voltage, the Control Display shows additional softkeys for
harmonics and fundamental frequencies.
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