CHAPTER 11
Specifications
125
Common Mode Rejection
Guaranteed
7mV – 7V
Input Range
22 V
Input Range
Guaranteed Typical Typical
0 – 120 Hz 40 dB, 50 dB at DC 70 dB 80 dB 50 dB
120 Hz – 1 kHz 40 dB 55 dB 60 dB 50 dB
1 kHz – 25.6 kHz 30 dB 40 dB 40 dB
Absolute Max. Common Mode Voltage ±15V
peak
without damage ±5 V
peak
without damage
±1.5V
peak
without clipping ±3 V
peak
without clipping
If common mode voltage exceeds the max. value, care must be taken to limit the
signal ground current in order to prevent damage. Maximum is 100 mA. The
instrument will limit the voltage to the stated max. “without damage” common mode
value
Anti-aliasing Filter
At least 90 dB
attenuation of those
frequencies which
can cause aliasing
Filter Type
Freq. Range
≤25.6 kHz
Freq. Range
>25.6 kHz
3rd order Butterworth 3rd order Butterworth
–0.1 dB @ 25.6 kHz 25.6 kHz 102.4 kHz
–3 dB @ 100 kHz 100 kHz 400 kHz
Slope –18 dB/octave –18 dB/octave
Supply for Microphone Preamplifiers ±15.0 V, max. 10 mA per channel ±14.0 V, max. 20 mA per channel
Supply for Microphone Polarization 200 V ±1 V, or 0 V
Supply for DeltaTron/ICP
®
/CCLD 4 mA from 24 V source
Tacho Supply (on BNT connectors) 6.5 V, max. 100 mA
Analog Special Functions Microphone Charge Injection Calibration (depending on software support)
Analog Self-test: Functional Check
Transducers: Supports IEEE 1451.4 capable transducers with standardised TEDS
Overload Detection Signal overload
CCLD overload: Detection of cable break or short-circuit + detection of CCLD
transducer working point fault
Microphone preamplifier overload: Detection of microphone preamplifier current
consumption too high or too low
Common mode voltage overload (Type 3110 only)
Specifications – Input Channels, Types 3109 and 3110 (Continued)
3109 3110
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