The LT100 laboratory grade, dual channel digital thermometer measures absolute temperatures and temperature differences over the range of 0 to 100 °C absolute. Designed as a primary calibration reference the LT100 can be used in any application requiring precision temperature measurement accurate to ±0.005 °C.

The LT100 comes standard with two thermistor probes in a configuration suitable for calibration of most models of EOI's CES, LES, CDS and LDS sources. Temperature of each probe is displayed on the front panel along with the difference between channels (delta T). Custom probes and probes configured for older EOI sources are also available.

Special Features

Principles of Operation

The LT100 uses a DC bridge network to sense the 2500 ohm thermistor probes supplied with the thermometer. The bridge output is compared to a very stable, low temperature coefficient reference voltage divider. The higher voltage output from this configuration results in greater temperature resolution and higher noise immunity than standard thermometers designed to work with platinum resistance thermometer. The proprietary measurement circuitry and temperature conversion algorithms provide repeatability and stability performance of ±0.002°C. Temperature can be displayed in °C, °F or K.

Probes

The EOI designed probes supplied with the LT100 are ultra stable thermistors mounted in a stainless steel sheath. The probe configuration is suitable for calibration of most models of EOI's CES, LES, CDS and LDS sources. Typical stability and repeatability is ±0.003°C over a six month period. Ten foot probe leads are connected to the rear panel of the thermometer. Individual probes are connected to the probe leads with a DIN connector. Custom probes and probes configured for older EOI sources are also available.

Calibration

For accurate temperature measurement, R_t must be converted uniquely for the probe in use. Calibration data for each probe is stored in a unique look-up table in non-volatile memory. Probe calibration data may be entered separately from the LT100 calibration data when several different probes will be used. For highest accuracy the probe and LT100 should be calibrated as a system.

Each LT100 is calibrated with its associated probes as a system, with calibration traceable to NIST provided with each system. Periodic calibration is required to maintain accuracy.

Calibration is an easy procedure involving comparison of the displayed temperature for each probe to a known temperature standard at specific temperatures throughout the range of the thermometer. During calibration, correction factors are entered via the front panel keypad or IEEE488 interface to correct the displayed temperatures.

All EOI probes are supplied with a calibration traceable to .

Accuracy

The following table provides an analysis of the potential sources of error;

  This is data sheet E0684. Information regarding this data sheet and any requests for data sheets may be directed to  eoi@electro-optical.com.  Specifications subject to change.

Address and Contact Information 
Phone:  805 964 6701    Fax:  805 967 8590
E-Mail: eoi@electro-optical.com

© Copyright Electro Optical Industries, Inc., '97,'98,'99, 2000