Fluke 1595A - Manual (Page 19)

9
Introduction and Specifications
Specifications
2.2.4 General Specifications
Table 8 General Specifications
Warm-up period 30 minutes
Measurement range 0 W to 500 kW
Measurement current range 0.001 mA to 20 mA
Measurement current reversal interval:
Sample period of 1 second or 2 seconds
Sample period of 5 second or 10 seconds
0.2 second
1.2 second
Standby current range 0.001 mA to 2 mA
AC power 100 V to 230 V (± 10 %)
50 or 60 Hz
Fuse Rating 2 A – T – 250 V
Specified operating temperature 15 °C to 30 °C
Absolute operating temperature 5 °C to 40 °C
Storage temperature 0 °C to 40 °C
Operating relative humidity, 5°C to 30°C 10 % to 70 %
Operating relative humidity, 30°C to 40°C 10 % to 50 %
Storage relative humidity 0 % to 95 %, non-condensing
Maximum operating altitude 3000 m
Dimensions:
Height
Width
Depth (with handles)
Depth (without handles)
Weight
147 mm (5.8 in)
439 mm (17.3 in)
447 mm (17.6 in)
406 mm (16.0 in)
7.3 kg (16.0 lb)
2.2.5 Applying the Specifications
2.2.5.1 Introduction
The purpose of this section is to help the user apply the specifications in measurement scenarios for which
the Super-Thermometer was designed. The following uncertainty calculation examples may not include all
uncertainties that are present in a measurement. Be sure to follow current best practices in uncertainty analysis
to correctly calculate measurement uncertainty.
2.2.5.2 How the Super-Thermometer Measures
In order to understand how to apply the specifications, it is important to know how the Super-Thermometer
measures. The fundamental measurement of the Super-Thermometer is the resistance ratio. It is the ratio
between an unknown resistance (R
x
) and a reference resistor (R
s
) – either internal or external. If a resistance
measurement is needed, the ratio is multiplied by the value of the reference resistor to calculate the resistance
of the R
x
resistor (for more information refer to Measurement Timing in the Menus and Screens section).
If a temperature reading is required, the R
x
resistance value is used to calculate the temperature using the cali-
bration coefficients entered into the Probe Library. When ITS-90 is selected as the temperature conversion, the
R
x
resistance is divided by the RTPW (resistance at the triple-point of water) value that is entered in the probe
definition. The resulting value is called W
T90
. The probe calibration coefficients and the ITS-90 equations are
then applied to W
T90
to calculate the temperature reading of the probe.
Since W
T90
is a ratio between a probe’s resistance at temperature (R
T90
) and its RTPW, W
T90
measurement ac-
curacy relies primarily on ratio accuracy if both R
T90
(R
x
) and RTPW are measured in close proximity in time.
Also, this only applies if the RTPW was measured by the Super-Thermometer and entered into the probe
definition.