GRAPHTEC WR300 - WR3-DCB Amplifier (for Strain Measurement) Specifications; WR3-FV Amplifier (for Frequency Measurement) Specifications

6-8
Specifications
WR3-DCB Amplifier (for strain measurement) Specifications
WR3-FV Amplifier (for frequency measurement) Specifications
Item Details
No. of channels 2 channels per unit
Input terminals/format Independent balanced input for each channel (NDIS strain input connectors)
Input coupling DC, CAL+, CAL–, ZERO, OFF
Measurement range Voltage: 1000 to 20,000 x 10
– 6
strain FS (1/2/5 steps)
Max permissible input Differential input 10 VDC (DC+ACp-p)
Sync voltage 100 VACrms
Insulation resistance Min. 100 MΩ (at 500 V DC)
Isolation voltage Between input terminal and casing: 1 minute at 1,000 V AC
A/D converter Sampling interval: 10 µs
Resolution: 16 bits (out of which 14 are internally acknowledged)
Common mode rejection ratio 80 dB typ (50/60 Hz)
Signal/noise ratio Max. 50 x 10
– 6
strain (2 V DC, 350 Ω)
Input resistance Approx. 10 MΩ (5 M + 5 M)
Accuracy (23 °C ±3 °C) ±(0.3% of F.S. +1.2 x 10
–6
strain)
Frequency bandwidth DC to 20 kHz (+1/–3 dB)
Stability Zero point ±1.2 x 10
– 6
strain/ °C
±10 x 10
– 6
strain/8 h
±10 x 10
– 6
strain/0.5 h (initial drift / from 10 s after power on)
Gain ±0.02% of F.S./ °C
0.10% of F.S./8h
Filters Line 1.5 Hz (+1/–3 dB) at –6 dB/oct
L.P.F 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz (–3dB) at –12 dB/oct
Gauge ratio 2.0 fixed
Gauge resistance 120 to 1000 Ω
Bridge voltage Voltage DC 2 V
Accuracy ±0.2%
Stability ±0.01%/ °C
Balance adjustment Method Auto balance adjustment method
Accuracy ±10 x 10
– 6
strain
Range Resistance ±2% (10,000 x 10
– 6
strain)
Item Details
Input terminals/format Independent unbalanced input for each channel (floating ground)
Input coupling DC (0 V reference), OC (+2.5 V reference), OFF
Measurement range 200 Hz to 40 kHz F.S. (1/2/4/5 steps)
Max permissible Between +/– terminals DC 60 V (DC+ACp-p)
input Between floating terminals 30 VACrms
A/D converter Sampling interval: 4 µs (250 kHz)
Resolution : 12 bits (out of which 14 are internally acknowledged)
Input resistance DC: Approx. 100 k Ω
OC: Approx. 10 k Ω
Accuracy ±0.5% of F.S.
Max. input frequency 40 kHz
Min pulse width Min. 2.5 µs
Min. voltage Min. ±1 V relative to the reference value
Low-pass filters 100 Hz, 1 kHz, 10 kHz (–3 dB) at –6 dB/oct