Additel 260Ex, Руководство пользователя, Страница: 18 / 52

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(2) Voltage range
：
-30~30V input impedance >1M Ω;
(3) Current measure
：
input impedance <40Ω;
Note 3: The excitation power supply for RTD measure is 0.2mA, and each position has 4-wire, 3-wire, and 2-wire
methods. The accuracy is as follows: (given accuracy data in the table in based on 4-wire)
(1) The accuracy of the 3-wire method is 10m
Ω more than the accuracy of the 4-wire method;
(2) The accuracy of the 2-wire method is 50m Ω more than the accuracy of the 4-wire method.
Note 4 ： Minimum threshold voltage for frequency and pulse measure
：
2.5V;
Note 5 ：
The frequency measure supports following units: Hz, kHz, MHz, CPM, CPH, s, ms, μ s
Note 6 ： There are rising edge and falling edge trigger mode available for pulse measure.
1.2.3 Simulate RTD measure accuracy (environmental temp.: 20±10 ℃ )
Table 3 Simulate RTD measure accuracy
Sensor type Temperature( ℃ ) Annual accuracy( ℃ )
PT10(385) -200
～
850
-200
～
200 0.59
200
～
600 0.72
600
～
850 0.82
PT25(385) -200
～
850
-200
～
200 0.27
200
～
600 0.35