Fluke 1595A - Manual (Page 118)

1594A/1595A Super-Thermometer
CALIBRATION PARAMETERS (F5)
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The results of the resistance calibration are written to the file as follows:
RESISTANCE,,,,,,,
is the nominal resistance of the internal reference resistor (in W).
is the channel number to which the standard resistor was connected.
is the calibrated resistance of the standard resistor.
is the measured resistance of the standard resistor.
is the error of the measurement compared to the calibrated resistance of the standard resistor, in units
of ohms.
is the standard error of the reported error, in units of ohms.
is the date and time of the test. The date is in the format YYYY-MM-DD. The time is in 24-
hour format.
9.5.2 ADJUST RESISTOR (F2)
The Adjust Resistor function allows the user to apply an adjustment to an internal reference resistor’s calibra-
tion parameter to improve its accuracy based on the results of the resistance calibration.
The Adjust Resistor function is always password protected. The user will be prompted to enter the correct
password to continue.
The Adjust Resistor screen shows the resistor that will be adjusted, the prior value of its calibration parameter,
and the new value of the calibration parameter. The user presses YES (F4) to change the calibration parameter.
The user may press the NO (F5) function key or the EXIT key to cancel the change.
When the calibration parameter is updated, the Calibration Date setting is also updated to the present date (see
Calibration Parameters in the Menus and Screens section). This can be overwritten by manually entering a
date and pressing the EXIT key to save the value.
9.6 CALIBRATION PARAMETERS (F5)
The calibration parameters may be viewed or adjusted by pressing the Calibration Parameters (F5) function
key. If a password is not entered, the user will be allowed to only view the parameters. Adjustment cannot take
place unless a password is entered. It is recommended to only adjust the calibration parameters as part of the
previously described calibration functions. Failure to enter the calibration parameters correctly will cause the
Super-Thermometer to measure with error.
If it is required to manually adjust the calibration parameters, press the ENTER key to save each change.
See the Ratio Calibration and Resistance Calibration sections for more information on the resistance calibra-
tion parameters and linearity calibration parameters.
The SI UNIT LOCK setting is used to enable or disable °F as an allowed temperature unit option. When this is
set to ON, temperatures may be displayed in units of °C and K only, and °F will not be available as an option
for the Unit setting (see System Menu, Temperature Unit, in the Menus and Screens section)
9.6.1 Calibration Interval
Ratio Self-Calibration can be performed as often as needed to ensure proper ratio performance. Since no ad-
ditional equipment is needed for Ratio Self-Calibration, it can be performed at the user’s convenience, as often
as necessary. Minimally, it should be checked every 6 months during the first year of use and an alignment
performed as needed.
Internal Resistor Calibration should be performed on a 6-month interval during the first year of use. After the
first year, a 12-month interval is recommended.