Specifications
6-7
WR3-M Amplifier (for voltage/temperature measurement) Specifications
Item Details
No. of channels 2 channels per unit
Input configuration Independent unbalanced input for each channel (floating ground)
Input resistance 1 MΩ ±1% constant
Input coupling AC, DC, TEMP., GND, CAL (1/2 F.S.), OFF
Measurement range [Voltage] 20, 50, 100, 200, 500 mV
1, 2, 5, 10, 20, 50, 100, 200, 500 V
Auto
[Temperature] TC-K: –200 to 1300 °C
TC-J: –200 to 1100 °C
TC-T: –200 to 400 °C
TC-R: 0 to 1600 °C
TC-E: –200 to 800 °C
TC-B: 600 to 1700 °C
Input filters [Line] 1.5 Hz (–3 dB) at –6 dB/oct.
[Low-pass] 5, 10, 30, 50, 500Hz, 5 kHz (–3 dB) at –6 dB/oct.
Accuracy (23°C ±3 °C) [Voltage] ±0.25% of F.S.
(Temperature accuracy includes [Temperature] < TC-K, J, E >
reference contact compensation –200 °C to 0 °C: ± (1% of rdg + 3.5 °C)
accuracy) Other: ± (0.2% of rdg + 3.5 °C)
< TC-T>
–200 °C to 0 °C : ± (0.8% of rdg + 3 °C)
Other: ± (0.2% of rdg + 3 °C)
< TC-R >
0 °C to 200 °C: ± 9.5 °C
200 °C to 800 °C: ± 6.5 °C
Other: ±(0.2% of rdg + 4.5 °C)
< TC-B >
600 °C to 700 °C: ± 9.5 °C
Other: ± (0.2% of rdg + 5.5 °C)
Temperature coefficient Zero point: 0.01% of F.S./ °C
Gain: 0.02% of F.S./ °C
Insulation resistance 100 MΩ (at 500 V DC)
Isolation voltage Between input terminal and casing: 1 minute at 1,000 V AC
Permissible signal source resistance Max. 1 kΩ
Input bias current 2nA (typ.)
A/D converter Sampling interval: 10 µs
A/D resolution: 16 bits (out of which 14 are internally acknowledged)
Common mode rejection ratio 100 dB typ (120 dB with Line Filter on)
Signal/noise ratio –46 dB (typ) 100 µVP-P at 20 mV range (with +/– shorted)
Frequency response DC coupling: DC to 20 kHz (+1/– 3 dB Typ.)
AC coupling: 10 Hz to 20 kHz (+1/– 4.5 dB Typ.)
Max permissible input voltage Between +/– terminals: 2 V to 500 V range : 500 V DC (DC + AC
P-P
)
20 mV to 1 V range: 100 V DC (DC + AC
P-P
)
Between input terminals and GND: 33 V AC rms
Input terminal type Banana connector (two connectors)
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