Fluke 522A/6, Operator'S Manual

Page: 117 / 426

Front Panel Operation
Waveform Types
4
4-41
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 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 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 10
μ
V/
°
C setting is used for customer-
supplied linearizations. 1 mV/%RH and 1 mV/
°
C settings are used for the
Vaisala humidity/temperature probes.)
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.
Sine Wave
When the wave selection is sine, a sine wave current or voltage signal is present on the
calibrator outputs (Figure 4-11). The variables for the sine wave are amplitude,
frequency, and dc offset voltage.