Technical / Environmental
Specifications for Summit RUs and CUs
Each Summit Remote Unit and Summit
Compact Unit includes its own processor. Thus all mathematical
operations like stacking and correlation are done in the Units. The
preprocessed data are transmitted to the Central Unit (PC) afterwards.
This procedure saves computing time on the PC as well as transmission
time.
Technical Specifications:
|
Sample Interval |
1/48, 1/32, 1/16, 1/8, 1/4, 1/2, 1, 2,
4, 8 ms |
|
Record Length |
0.5 K, 1.0 K, 1.5 K, ...,
..., 120 K in dynamite mode
..., 40 K in dynamite mode incl.
stacking
..., 60 K in vibro mode
..., 30 K in vibro mode incl. stacking |
|
Preamp Gain |
0 dB, 20 dB or 40 dB |
|
A/D Converter |
24 bit Delta Sigma Technology |
|
Maximum Input Signal |
2.0 Volt RMS
5.6 Volt peak to peak |
|
Input Impedance |
20 kOhm |
|
Instantaneous Dynamic Range |
≥ 120 dB @ 2 ms Sampling Interval |
|
Equivalent Input Noise |
CU: less than 0.3 µV RMS @ 2 ms
Sampling Interval and 40 dB Preamp Gain
RU: less than 0.2 µV RMS @ 2 ms Sampling
Interval and 40 dB Preamp Gain |
|
Crosstalk |
≥ 112 dB (between channels) |
|
Total Harmonic Distortion |
≥ 0.0008 % |
|
Common Mode Rejection Ratio |
≥ 100 dB |
|
Gain Accuracy |
typical 1 % (between all channels) |
|
Time Accuracy |
typical 5 ppm (between all channels) |
|
Analog Anti-Alias Filter |
7.2 kHz; 6 dB/Octave |
|
Analog Low-Cut Filter |
1 Hz; 6 dB/Octave |
|
Digital Anti-Alias Filter |
19.2 kHz @ 1/48 ms Sampling Interval
12.8 kHz @ 1/32 ms Sampling Interval
6.4 kHz @ 1/16 ms Sampling Interval
3.2 kHz @ 1/8 ms Sampling Interval
1.6 kHz @ 1/4 ms Sampling Interval
800 Hz @ 1/2 ms Sampling Interval
400 Hz @ 1 ms Sampling Interval
200 Hz @ 2 ms Sampling Interval
100 Hz @ 4 ms Sampling Interval
50 Hz @ 8 ms Sampling Interval |
|
Rejection at Nyquist
Frequencies |
-120 dB |
|
Passband Ripple |
+/- 0.05 dB |
|
Build-In-Test Functions |
- Sine Wave
- Pulse
- Instrument Noise
- Geophone Step
- Sweep Transfer
- Autocorrelation |
|
System Check |
- Battery Status
- Equivalent Input Noise
- Total Harmonic Distorsion
- Instantaneous Dynamic Range
- Common Mode Rejection
- Cross Talk
- Time Accuracy |
|
Geophone Check |
- Impedance
- Damping
- Natural Frequency
- Noise |
Environmental Specifications:
|
Operation Temperature |
-30°C to
+ 80°C |
| Humidity
Range |
0 - 95% |
| Case |
Solid waterproof
housing deployable in any surface environment |
|
