EC RTD.2
Output from EC RTD.2
Technical changes reserved
- 27 -
5.1
Resistance output
NOTICE!
The device generates a simulated resistance value ranging from 400
Ω
to 4000
Ω
from
the output terminal (RTD/
Ω
). The output method for simulating resistance is that the de-
vice outputs the corresponding voltage “Vx “according to the exciting current “Ix” gener-
ated by the calibrated meter. Because R (set resistance) = Vx (output voltage) / Ix (excit-
ing current), the calibrated device must provide an exciting current to the calibrator. For
realizing the correct simulated output of 400
Ω
, the exciting current should be within the
range of ± 0.5…± 3 mA; for a simulated output of 4000
Ω
, the exciting current should be
within the range of ± 0.05…± 0.3 mA.
NOTICE!
If the output resistance is 4-wired for calibration, the error generated by the resistance
(approximately 0.1
Ω
) of the test lead should be considered if the user employs two wires
connection method. The device may generate an incorrect resistance value if the capacity
between the output terminals and the measured meter is higher than 0.1 µf.
1. Make sure that OUTPUT is indicated on the
display. If not, press the Output/Input but-
ton.
2. Press the FUNC button to select the re-
sistance or thermal resistance (RTD) func-
tion.
3. Insert one end of the test lead into the
OUTPUT terminal of the instrument and
connect the other end to the input terminal
of the device under test. See Figure 5-1.
(The special test lead provided by the In-
strument can be connected as 4-wired sys-
tem output according to User’s request).
4. Press the RANG button to select resistance
range or the corresponding graduation of
thermal resistance.
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. Press the ZERO button and the output will be set to 0.
Figure 5-1
