SIRIUS® Measurement Modules
5.7 ACC / ACC+
The ACC modules are perfect for sound and vibration IEPE channels.
5.7.1 ACC: Specifications
Inputs
Voltage, IEPE, current (ext. Shunt),
ACC+ only: counter, discrete
ADC Type
24bit delta-sigma dual core with anti-aliasing filter (5.2.1 SIRIUS® Dual Core series: High Dynamic
(up to 160 dB) page 49)
Sampling Rate Simultaneous 200kS/sec
Ranges (Dual Core Low Range) ±10V (±500mV) ±500mV (NA)
Input Accuracy (Dual Core) ±0.1% of reading ±10(1)mV ±0.1 of reading ±1(NA)mV
Dynamic Range@10kS (Dual Core) 140 dB (160 dB) 135 dB (NA)
Typ. SNR@50kS (Dual Core) 107 dB (125 dB) 100 dB (NA)
Typ. CMR @ 50Hz (1kHz) 140 dB (120 dB) 140 dB (120 dB)
Gain Drift Typical 10 ppm/K, max. 30 ppm/K
Offset Drift Typical 2 μV/K + 10 ppm of range/K, max 2 μV/K + 20 ppm of range/K
Gain Linearity <0.02%
Inter Channel Phase-mismatch 0.02° * f
in
[kHz] + 0.1° (@ 200 kS/sec)
Channel Cross talk 200 dB @ 50Hz; 165 dB @ 1kHz
Input Coupling DC, AC 1Hz (3 Hz, 10 Hz per SW)
Input Impedance 1 MΩ in parallel with 0.4nF
Overvoltage Protection In+ to In-: 50 V continuous; 200V peak (10msec)
IEPE mode
Excitation 4 or 8mA
Compliance voltage 25 Volt
Output Impedance >100 kΩ
Sensor detection Shortcut: <4Volt; Open: > 19Volt
Counters (ACC+ type only) 1 counter/3 digital input, fully synchronised with analogue data
Counter Modes counting, waveform timing, encoder, tacho, gear-tooth sensor
Input Level Compatibility CMOS, LVTTL
Input Protection ±25Volt continuous
Alarm output Open collector, max. 100mA/30Volt
Sensor supply 5V/100mA;12V/50mA
Additional Specifications
Input connector BNC
TEDS support IEPE mode only
Table 9: SIRIUS-ACC8 specifications
5.7.2 ACC BNC
Illustration 93: SIRIUS-ACC: pin-out
(BNC)
Illustration 94: SIRIUS
i
8xACC
5.7.3 ACC+ (Counter) L1B7f
As an additional function to the ACC module, the ACC+ module also has a 7-pin Lemo connector for digital counters.
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