Keithley 740 System Scanning Thermometer

Keithley 740 System Scanning Thermometer
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Keithley 740 System Scanning Thermometer Keithley 740 System Scanning Thermometer Keithley 740 System Scanning Thermometer
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Datasheet

 

The Model 740 Programmable Thermometer has a built-in reference junction and will linearize any of 7 different thermocouple types.
 

Features:

  • Scan 9 thermocouple inputs
  • Expand to 81 inputs
  • Thermocouple types J, K, T, E, R, S or B
  • °C, °F, or mV readings
  • Store temperature profiles
  • Record temperature trends
 

Specifications:

mV Input Resistance >1 GW
Input Current 800 pA max
Max Input 250V rms, 350V peak
Max Common Mode Voltage 200V peak to earth
Thermocouple Loop Resistance 1 kW max
Filter Settling Time 100 ms
Scanning Rate Filter Disabled >20 channels/second
Filter Enabled >5 channels/second
Bench Reading Rate Filter Disabled 8 readings/second
Filter Enabled 4 readings/second
Logging Interval One of 12 selectable rates from 50ms to 1 hour
Scanning Interval One of 10 selectable rates from 500ms to 1 hour

Type Temperature Range °C Temperature Range °F Accuracy
mV
-99.999 to 100.000 mV
±(0.02% + 3 mV)
J -100 to 760 -148 to 1400 ±0.4°C or ±0.8°F
K -100 to 1372 -148 to 2501 ±0.5 °C or ±0.9°F
T -100 to 400 -148 to 752 ±0.5°C or ±0.8°F
E -100 to 1000 -148 to 1832 ±0.5 °C or ±0.9°F
R 0 to 1780 32 to 3236 ±1 °C or ±2°F
S 0 to 1780 32 to 3236 ±1°C or ±2°F
B 350 to 1820 662 to 3308 ±1 °C or ±2°F