CHAPTER 11
Specifications
117
Specifications – Input Channels, Standard 24-bit and Dyn-X
Standard 24-bit
7537/37-A/39/39-A
3038/38-B/39/39-B
3560-B-010/020/030/040
Dyn-X
7538/38-A/40/40-A
3040/40-B/41/41-B
3560-B-110/120/130/140
Frequency Range DC to 25.6 kHz
A/D Conversion 24-bit 2 × 24-bit
Data Transfer 24-bit
16-bit selectable
Input Voltage Range 8 ranges: 7.071 mV
peak
to 7.07 V
peak
in 10 dB steps
a
, + 12 V
peak
1 range: 10V
peak
Input Signal Ground Coupling Floating or single-ended (grounded to chassis)
Input Impedance Direct, Microphone: 1 MΩ||<200 pF
CCLD: >100 kΩ||<200 pF
Absolute Maximum Input ±35V
peak
without damage
High-pass
Filters
(see
Fig.11.1)
DC (f
L
= 0)
–0.1 dB –10% –3 dB Slope –10% –3 dB Slope
0.7 Hz high-pass filter 0.15 Hz 0.073 Hz –20 dB/dec. 0.15 Hz 0.073 Hz –20 dB/dec.
7 Hz digital high-pass filter 1.45 Hz 0.707 Hz –20 dB/dec. 1.45 Hz 0.707 Hz –20 dB/dec.
22.4 Hz high-pass filter 14.64 Hz 11.5 Hz –60 dB/dec. 14.64 Hz 11.5 Hz –60 dB/dec.
Intensity filter 23.00 Hz 11.2 Hz –20 dB/dec. 23.00 Hz 11.2Hz –20 dB/dec.
Absolute Amplitude Precision, 1 kHz,
1V
input
±0.05dB, typical ±0.01dB
Attenuator Linearity @ 1 kHz ±0.05 dB, typ. ±0.005 dB –
Amplitude
Linearity
(linearity in
one range)
0 to 60 dB below full scale ±0.1 dB, typ. ±0.01 dB ±0.05 dB, typ. ±0.01 dB
60 to 80 dB below full scale ±0.2 dB, typ. ±0.02 dB ±0.05 dB, typ. ±0.01 dB
80 to 100 dB below full
scale
typ. ±0.05dB ±0.2dB, typ. ±0.02dB
100 to 120 dB below full
scale
– typ. ±0.02 dB
120 to 140 dB below full
scale
– typ. ±0.02 dB
140 to 160 dB below full
scale
–typ. ±1dB
Overall Frequency Response
re 1 kHz, lower limit f
L
to upper limit f
U
DC to max. 25.6 kHz: ±0.1 dB
Noise:
Measured lin.
10 Hz to 25.6 kHz:
V
rms
(input terminated by
50 Ω or less)
(Values in
parentheses are
specified in
nV
rms
/√Hz @1 kHz)
Input Range Guaranteed Typical Guaranteed Typical
7.071 mV <2.5 (<16) 2.2 (<14) Signal level <316 mV
peak
22.36 mV < 3 (<19) 2.2 (<14)
<4 (<25) 3 (<19)70.71 mV <4 (<25) 2.5 (<16)
223.6 mV <6 (<38) 5.5 (<35)
707.1 mV <17 (<107) 13 (<82) Signal level >316 mV
peak
2.236 V <50 (<313) 33 (<207)
<60 (<375) 50 (<313)7.071 V <150 (<940) 100 (<625)
12 V <250 (<1570) 150 (<940)
a. In rare cases in CCLD mode or when measuring signals with a high DC level in the 7 mV
peak
and 22.36 mV
peak
ranges with
0.7 Hz or 7 Hz high-pass filter settings, an overload might be indicated. If this occurs, increase the input voltage range
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