7068 RTD Temperature Calibrator0 pages

Time Electronics

7068 RTD Temperature Calibrator Module
• Temperature accuracy 0.05°C (0.09°F)
• Temperature resolution 0.01°C (0.02°F)
• Resistance accuracy 0.03Ω
• Resistance resolution 0.01Ω
• 2, 3, and 4 wire connections
• Measure and simulate °C, °F, °K, & Ω
• Ramp and step
• PT100 plus 7 other RTD types
• User programmable
DESCRIPTION
The 7068 is a process control module that combines a precision digital thermometer (using RTD probes) with an
RTD/ohms calibrator.
Easy to use, it solves the problem of making high accuracy temperature measurements without using bulky mains
powered instrumentation. It can also be used as an external temperature reference for dry block and other precision
temperature baths.

MODES OF OPERATION
Monitor Mode (4 wire)
Typical Functions................................. 1. Check RTD probes by measuring their resistance at known temperatures.
............................................................. 2. Measure resistance values.
............................................................. 3. Indicate temperature when connected to an RTD probe.
............................................................. 4. Can be pre-programmed with a particular RTD’s characteristics to allow very high accuracy.
Excitation current................................. 1mA on all ranges
Resistance range................................. 0.01Ω to 2.6kΩ
Resolution............................................ 0.01Ω
Accuracy.............................................. See specifications on next page
Auto re-calibration................................ Every 0.6 secs.
Temperature stability............................ Better than 0.0015% per °C
Max/Min values.................................... Logged automatically
The 7068 may be used with a calibrated and certified probe to produce a highly accurate thermometer.
The performance can be further enhanced by programming the actual characteristic of the probe into the unit.

Simulator Mode (4 wire)
Typical Functions................................. 1. Output resistance of precise known value.
............................................................. 2. Simulate an RTD value from an RTD table chart.
............................................................. 3. Simulate an RTD value using the internal table.
Excitation current................................. 0.6mA to 1mA
Resistance range................................. 0.01Ω to 2.6kΩ
Resolution............................................ 0.01Ω
Accuracy.............................................. See specifications on next page
Auto re-calibration................................ Every 0.6 secs.
Temperature stability............................ Better than 0.0015% per °C
Enhanced performance may be achieved by programming the unit to simulate the characteristic of a particular probe.
Five fixed step points (0, 25, 50, 75, 100%) are available between a user set minimum (0%) and a maximum (100%).
Programmable ramp function is also available.

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