Front-Panel Operation
Set Output
4
4-39
•
Out@TC
terminal (Output at the front panel TC terminals) Shows the actual dc
voltage at the front panel TC terminals. This is a display only, not a softkey function.
•
TC MENUS
(Thermocouple Menu) Shows submenus for thermocouple outputs.
o
UNITS
(Temperature Units) Selects
°
C or
°
F as the temperature unit.
o
REF SRC
(Reference Source) Selects intrnl (Internal) or extrnl (External)
temperature reference source. Select intrnl when the selected thermocouple has
alloy wires and you use the isothermal block internal to the Calibrator. Select
extrnl when you use an external isothermal block, and when the selected
thermocouple has copper wires. Push the REF softkey to record the value of the
external temperature reference. The best accuracy is when you use extrnl and the
external isothermal block is kept at 0
°
C.
o
REF
(Temperature Reference) Shows the value of the temperature reference.
When the Reference Source is Internal, the display shows the internal reference,
or NONE if the Calibrator is in Standby. When the Reference Source is External,
the display shows the value you recorded for external reference.
o
OUTPUT
(Temperature Output Device) Selects the temperature device:
thermocouple (tc) or resistance temperature detector (rtd). Select tc.
o
TYPE
(Thermocouple Type) Selects the thermocouple type simulated by the
Calibrator. The default is type K. (The 10
μ
V/
°
C and 1 mV/
°
C settings are used
as an accurate output voltage source for user-supplied linearizations.)
Note
The “u” indicator that occasionally shows in the Output Display shows an
internal adjustment to the measured isothermal block temperature and is
usual. If it shows for more than 10 seconds (nominal), or if it flashes
continuously, make sure that you do not externally heat the thermocouple
miniconnector or wires.
Set Temperature Simulation (RTD)
RTDs have a resistance quality at specified temperatures. The simulated output is a
resistance value that comes from the selected temperature and type of RTD simulated. To
toggle the degree reference between the 1968 International Provisional Temperature
Standard (IPTS-68) and the 1990 International Temperature Standard (ITS-90), see “Use
the Instrument Setup Menu” in this chapter.
Complete the subsequent procedure to set a simulated RTD temperature output at the
front panel NORMAL terminals. If you make an entry error, push
to clear the
display, then enter the value again.
1.
Push
to clear any output from the Calibrator.
2.
Connect the UUT as in the “Connect the Calibrator to a UUT” section of this chapter.
Note
When you calibrate Resistance Temperature Detectors (RTDs) with the
three-terminal connection shown in Figure 4-9, make sure the test leads
have the same resistances to cancel errors caused by lead resistance. This
can be done, for example, with three of the same test lead lengths and the
same connector styles.
3.
Set the UUT to measure temperature in the necessary range.
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