6
Single channel phase
Phase accuracy relative to external
trigger
± 4.0 deg
16 time averages center of bin,
DC coupled 0 dBfs to -50 dBfs only
0 Hz < freq ≤ 10.24 kHz only
For Hann and flat top windows, phase is relative to a cosine
wave at the center of the time record. For the uniform, force,
and exponential windows, phase is relative to a cosine wave
at the beginning of the time record.
Cross-channel amplitude
FFT cross-channel gain accuracy ± 0.04 dB (0.46%)
Frequency response mode
Same amplitude range
At full scale: Tested with 10 RMS
averages on the -11 to +27 dBVrms
ranges, and 100 RMS averages on
the -51 dBVrms range
Cross-channel phase
Cross-channel phase accuracy
(Same conditions as cross-channel
amplitude)
± 0.5 deg
Input
Input ranges (full scale)
(Auto-range capability)
+27 dBVrms (31.7 Vpk) to -51 dBVrms
(3.99 mVpk) in 2 dB steps
Maximum input levels 42 Vpk
Input impedance 1 MΩ ±10%
90 µF nominal
Low side to chassis impedance 1 MΩ ±30% (typical)
Floating mode <0.010 µF
Grounded mode ≤100 Ω
AC coupling rolloff <3 dB rolloff at 1 Hz
Source impedance = 50 Ω
Common mode rejection ratio
Single tone at or below 1 kHz
-51 dBVrms to -11 dBVrms ranges >75 dB typical
-9 dBVrms to +9 dBVrms ranges >60 dB typical
+11 dBVrms to +27 dBVrms ranges >50 dB typical
Common mode range
(floating mode) ± 4 V pk
IEPE transducer power supply
Current source 4.25 ± 1.5 mA
Open circuit voltage +26 to +32 Vdc
A-weight filter Type 0 tolerance
Conforms to ANSI Standard S1.4-1983;
and to IEC 651-1979; 10 Hz to 25.6 kHz
Crosstalk
Between input channels, and
source-to-input (Receiving channel
source impedance = 50 Ω)
< -135 dB
below signal or
< -80 dBfs of
receiving
channel, which-
ever response
is greater in
amplitude
Time domain
Specifications apply in histogram/time mode,
and unfiltered time display
DC amplitude accuracy ±5.0 %fs
Rise time of -1 V to 0 V test pulse <11.4 µSec
Settling time of -1 V to 0 V test pulse <16 µSec to 1%
Peak overshoot of -1 V to 0 V
test pulse
<3%
Sampling period
1 channel mode 3.815 µSec to 2 Sec in 2x steps
2 channel mode 7.629 µSec to 4 Sec in 2x steps
4 channel mode 15.26 µSec to 8 Sec in 2x steps
(Option AY6 only)
(202 pagine)
(18 pagine)
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