Hart 1590 and 1575 Thermometer Specifications

	*Hart1590 and 1575 Thermometer Readout Specifications*
	*Hart Scientific Calibration Products > Primary Temperature Standards >*
	*1590-1575 Thermometer Readouts > Features > Specifications > Ordering Information >*

1590 and 1575 Super-Thermometer Readouts for use with SPRTs and Thermistors - Specifications

Specifications	1575			1590
Range	Nominal Resistance	Accuracy (indicated value)	Equivalent Temp. Value, at 0°C	Nominal Resistance	Accuracy (indicated value)	Equivalent Temp. Value, at 0°C
Transfer Accuracy (using external reference resistor)	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	40ppm 20ppm 4ppm 4ppm 10ppm	0.01°C 0.005°C 0.001°C 0.001°C 0.00025°C (thermistor at 25°C)	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	20ppm 5ppm 1ppm 1ppm 5ppm	0.005°C 0.00125°C 0.00025°C 0.00025°C 0.000125°C (thermistor at 25°C)
Absolute Accuracy (using internal reference resistor)	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	100ppm 40ppm 8ppm 8ppm 20ppm	0.025°C 0.01°C 0.002°C 0.002°C 0.0005°C (thermistor at 25°C)	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	40ppm 20ppm 6ppm 6ppm 10ppm	0.01°C 0.005°C 0.0015°C 0.0015°C 0.00025°C (thermistor at 25°C)
Typical Resolution	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	10ppm 5ppm 1ppm 1ppm 3ppm	0.0025°C 0.00125°C 0.00025°C 0.00025°C 0.000075°C (thermistor at 25°C)	0.25Ω 2.5Ω 25Ω 100Ω 10kΩ	10ppm 2ppm 0.5ppm 0.5ppm 2ppm	0.0025°C 0.0005°C 0.000125°C 0.000125°C 0.00005°C (thermistor at 25°C)
Resistance	0Ω to 500kΩ
Internal Reference Resistors	1Ω, 10Ω, 100Ω, 10kΩ
Minimum Measurement Period	2 seconds
Current Source	0.001mA to 20mA, programmable
Analog Output	-5 volts to +5 volts
Display	Monochrome LCD with CCFT backlight			Color LCD with CCFT backlight
Power Supply	100 - 125 Vac/200 - 250 Vac, (user switchable), 50/60Hz, 1A
Dimensions	178mm (H) x 516mm (W) x 320mm (D)
Weight	16kg
Calibration	Includes NIST- traceable accredited calibration

Specifications - Multiplexers
Channels	Model 2575	10
	Model 2590	10 per unit, cascade up to 5 units for 50 channels
Connector	4-wire plug, floating guard
Terminals	Gold-plated Hart DWF Connectors
Relays	Low thermal EMF, hermetically sealed, magnetically shielded
Contact Resistance	<0.1Ω
Isolation	1 x 10¹² between relay legs
Channel Selection	Manual or auto
Current Capability	20mA
Current Levels	Model 1575A	Current on active channel only
	Model 1590	Standby current 1mA, or 10µA on all channels
Power Supply	Via connection to Models 1575A or 1590
Dimensions	178mm (H) x 516mm (W) x 320mm (D)