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CRVW3 3-Channel Vibrating-Wire Datalogger
11
Vibrating Wire
Measurement
Excitation Options:
2 V (±1 V), 5 V (±2.5 V), 12 V (±6 V)
Measurement
(Frequency) Resolution:
0.001 Hz RMS (–40 to 70 °C)
Time-series
Basic Resolution:
24-bit ADC
Measurement Accuracy:
±0.005% of reading (–40 to 70 °C)
Measurement Method:
VSPECT (Spectral Analysis), U.S. Patent
No. 7,779,690, includes diagnostic data
Temperature (Resistance)*
Measurement Method:
Half-bridge ratiometric, 24-bit ADC,
built-in
completion resistor 4.99 kΩ 0.1%
Thermistor Precision:
0.020
Ω
RMS @ 3000
Ω
(approximately
0.00015 °C RMS for most vibrating wire
thermistors)
Accuracy:
±0.15% of reading (–40 to +70 °C)
Wireless Communications
RF451 Option
Radio Type:
900 MHz Frequency Hopping Spread
Spectrum (FHSS)
Frequency:
902 to 928 MHz
Transmit
Power Output:
5 mW to 1 W, user selectable
Range:
20 to 25 miles assuming ideal conditions,
line-of-sight, and appropriate antenna
Modulation:
2 level GFSK
Spreading Method:
Frequency hopping
Occupied Bandwidth:
142 kHz (applicable to FCC ID
KNYAMM0921TT)
Hopping Patterns:
15 per band, 105 total, user selectable
Hopping Channels:
50 to 111, user selectable
Hopping Bands:
7, user selectable
Frequency Zones:
16 zones
Receive
Sensitivity:
–108 dBm at 115.2 kbps for 10
–4
bit error rate
–103 dBm at 153.6 kbps for 10
–4
bit error rate
IF Selectivity:
40 dB at fc ± 230 kHz
RF Selectivity:
60 dB at 896 MHz, 935 MHz
Dynamic Range:
+10 dBm 3
rd
order intercept point at input
connector
Summary of Contents for CRVW3
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Page 121: ...Appendix A Updating CRVW3 Firmware A 4 ...
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