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Page 94 of 97
Issue: 1.04
11 Specification
Ranges
Resistance Thermometers:
0
Ω
to 500k
Ω
Thermocouples:
±125mV
Accuracy –
PRTs
µK400:
0.4ppm maximum over whole range for SPRT
with R
0
≥
2.5
Ω
(equivalent to 0.1mK at 0°C, or 0.4mK over
full range) 1ppm maximum over whole range for SPRT with
R
0
=0.25
Ω
µK800:
0.8ppm maximum over whole range for SPRT
with R
0
≥
2.5
Ω
(equivalent to 0.2mK at 0°C, or 0.8mK over full
range) 2ppm maximum over whole range for SPRT with
R
0
=0.25
Ω
Accuracy –
Thermocouples
Voltage uncertainty:
250nV (between 0 and 20mV)
equivalent to 0.01°C for Gold-Platinum thermocouple at
1000°C
Resolution
Resistance:
0.01ppm of range
Voltage:
2nV (125mV range)
Stability
Resistance (excluding resistance standard):
0 (note1)
Voltage:
3ppm/year
Measurement
Time
Resistance:
< 2s (1s using the RS232 or GPIB interfaces)
Voltage:
< 1s (0.5s using the RS232 or GPIB interfaces)
Temperature
Conversions
PRTs:
ITS-90, Callendar-van Dusen
Thermocouples:
IEC584-1 1995 (B,E,J,K,N,R,S,T), L and
gold-platinum
Thermistors:
Steinhart-Hart
Sensor Current
0-10mA in 3 ranges:
0.1mA ±0.4% of value, ±70nA, resolution 28nA
1mA ±0.4% of value, ±0.7µA, resolution 280nA
10mA ±0.4% of value, ±7µA, resolution 2.8µA
