Resistance Output - Sika Ec Rtd Betriebsanleitung

EC RTD

5.1 Resistance output

NOTICE!
The calibrator produces the simulated resistance up to 400 Ω at the output terminal. The
method of simulating resistance output is to send out an appropriate voltage 'VX' accord-
ing to the exciting current 'IX 'produced by the calibrated instrument. Because R (set re-
sistance) = Vx (output voltage) /IX (exciting current), the calibrated device must provide
an exciting current to the calibrator. In order to produce correct simulated output, the
exciting current should range from 0.5 mA to 2 mA.
NOTICE!
A 4-wire system is designed for the resistance output during the calibration. If the user
adopts a two-wire system, he or she should take into consideration the error (approx.
0.1 Ω) arising from the lead resistance of the test leads. If the capacitance between the
resistance output terminal of the calibrator and the tested instrument is more than
0.1 μf, the calibrator will produce improper resistance.
 1. Make sure that OUTPUT is indicated on the
display. If not, press the Input / Output but-
ton.
 2. Press the FUN button to select the re-
sistance or thermal resistance (RTD) func-
tion.
 3. Insert one end of the test lead into the out-
put terminal of the instrument and connect
the other end with the input of the device
under test as shown in Figure 5-1 (the dedicated test leads supplied with the instrument
can be made into a 3-wire or 4-wire system for output according to user's requirement.)
 4. Only RTD function: Press the RANG button to select the corresponding type of RTD.
 5. Press the ◄ / ► buttons to select the set digits for output.
 6. Press the ▲ / ▼ buttons to change the numerical value of the set digits. Hold the button
for one second and the value will keep changing.
 7. Only RTD function: Press the °C/°F button to select the temperature unit.
 8. Press the ZERO button and the output will be set to 0.
Technical changes reserved
Output from EC RTD
Hi Lo Lo Hi
30V 30V
MAX MAX
INPUT OUTPUT
Vx
V
3W 4W
Ix
Figure 5-1
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