10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • [email protected]
17
GENERAL INFORMATION
• To return the calibrator output to 0° while in the OPR mode, press
the CLEAR key.
• The unit can be used as a convenient °F to °C or °C to °F calculator.
For example, to convert 77°F to a Celsius reading, go to the CALIB OPR mode, enter the reading
to be converted, and change scale.
eg.°F
CHANGE/ENTER
77
CHANGE/ENTER
°C (Display reads 25°C)
7. CALIBRATOR MODE OPERATION (RTD, Thermistor & Ohms)
NOTE:
The 850/855 requires a steady current to function properly in the
calibration mode. Some transmitters operate with a pulsating current
which won't work with the 850/855. These devices are normally provided
with a calibration mode which when enabled stops sending pulsating
current and supplies a steady current. Disabling the mode returns the
transmitter to its normal operating state.
Set-Up:
1. Connect measurement equipment under test (eg. RTD thermometer, ohmmeter etc.) to the
instrument as shown in Figures 8, 9, or 10.
The same performance tradeoffs apply to 2, 3 and 4-wire simulations as to 2, 3, and 4-wire
measurements. Refer to RTD, Thermistor and Ohms Meter-Mode section above for wiring
guidelines.
2. Set instrument to CALIBRATOR mode.
3. Use the sensor-select key to set the instrument to the appropriate function and range.
Figure 8. 2-Wire Resistance Simulation