SRS动态信号分析仪、SRS SR785动态信号分析仪、100kHz双通道FFT分析仪
- DC至102.4 kHz带宽
- 90 dB动态范围
- 145 dB动态范围(正弦扫频)
- 订单跟踪
- 20极点/20零点曲线拟合
- 实时倍频程分析
- 高达32兆字节的内存
- GPIB和RS-232接口
概观
| SR785双通道动态信号分析仪是一款精密、全功能信号分析仪，提供一流的性能，而价格不到竞争分析仪的一半。SR785以其前身SR780为基础，集成了新的固件和硬件，是分析机械和电气系统的理想仪器。 |
SR785 Specifications | |
| Specifications apply after 30 minutes warm-up and within 2 hours of last auto-offset. Measured with 400 line resolution and anti-alias filters enabled unless stated otherwise. | |
Measurement Groups | |
| Groups | FFT, Correlation, Time Histogram, Swept-Sine, Order Tracking |
Frequency | |
| Range | 102.4 kHz or 100 kHz (both displays have the same range) |
| FFT spans | 195.3 mHz to 102.4 kHz or 191 mHz to 100 kHz. The two displays can have different spans and start frequencies. |
| FFT resolution | 100, 200, 400 or 800 lines |
| Real-time bandwidth | 102.4 kHz (highest FFT span with continuous data acquisition and averaging) |
| Accuracy | 25 ppm from 20 °C to 40 °C |
Dynamic Range | |
| Dynamic range | 90 dB typical, 80 dB guaranteed (FFT and Octave). 145 dB typical (Swept-Sine). Includes spurs, harmonics, intermodulation distortion, and alias products. Excludes alias responses at extremes of span. |
| Harmonic distortion | <-80 dB (single tone in band) |
| Intermod. distortion | <-80 dB (two tones in band, each less than -6.02 dBfs) |
| Spurious | <-80 dBfs |
| Alias responses | <-80 dBfs (single tone outside of span, <0 dBfs, less than 1 MHz) |
| Full span FFT noise floor | -100 dBfs typical (input grounded, >-30 dBV, Hanning window, 64 rms averages) |
| Residual DC response | <-30 dBfs (FFT with Auto-Cal on) |
Amplitude Accuracy | |
| Single channel | ±0.2 dB (excluding window effects) |
| Cross channel | ±0.05 dB, DC to 102.4 kHz (frequency response measurement, both inputs on the same range, rms averaged) |
Phase Accuracy | |
| Single channel | ±3.0 deg. relative to external TTL trigger (-50 dBfs to 0 dBfs, freq <10.24 kHz, center of frequency bin, DC coupled). For Blackman-Harris, Hanning, Flat-Top and Kaiser windows, phase is relative to a cosine wave at center of time record. For Uniform, Force and Exponential windows, phase is relative to a cosine wave at beginning of the time record. |
| Cross channel | ±0.5 deg. (DC to 51.2 kHz) ±1.0 deg. (DC to 102.4 kHz) (frequency response measurement, both inputs on same range, vector averaged) |
Signal Inputs | |
| Number of inputs | 2 |
| Full-scale input range | -50 dBV (3.16 mVp) to +34 dBV (50 Vp) in 2 dB steps |
| Maximum input level | 57 Vp |
| Input configuration | Single-ended (A) or differential (A-B) |
| Input impedance | 1 MΩ + 50 pF |
| Shield to chassis | Floating mode: 1 MΩ + 0.01 µF Grounded mode: 50 Ω (shields grounded in (A-B) mode) |
| Max. shield voltage | 4 Vp |
| AC coupling | 0.16 Hz cutoff frequency |
| CMRR | 90 dB at 1 kHz (input range <0 dBV) 80 dB at 1 kHz (input range <10 dBV) 50 dB at 1 kHz (input range ≥10 dBV) |
| ICP signal conditioning | Current source: 4.8 mA Open circuit voltage: +26 V |
| A-weight filter | Type 0 tolerance, ANSI standard S1.4-1983; 10 Hz to 25.6 kHz |
| Crosstalk | <-145 dB below signal (input to input and source to inputs, 50 Ω receiving input source impedance) |
| Input noise | <10 nVrms/√Hz above 200 Hz (<-160 dBVrms/√Hz) |
Trigger Input | |
| Modes | Free Run, Internal, External, or External TTL |
| Internal | Level adjustable to ±100 % of input scale, positive or negative slope. Min. trigger level: 5 % of input range |
| External | Level adjustable to ±5 V in 40 mV steps, positive or negative slope. Input impedance: 1 MΩ Max. input: ±5 V Min. trigger amplitude: 100 mV |
| External TTL | Requires TTL level to trigger (low <0.7 V, high >3.0 V) |
| Post-trigger | Measurement record is delayed up to 100,000 samples after the trigger. |
| Pre-trigger | Measurement record starts up to 8000 samples prior to the trigger. |
Tachometer Input | |
| Pulses per revolution | 1 to 2048 |
| RPM accuracy | ±50 ppm (typ.) |
| Tach level range | ±25 V, ±5 V, TTL |
| Tach level resolution | 20 mV @ ±25 V, 4 mV @ ±5 V |
| Max. tach input level | ±40 Vp |
| Min. tach pulse width | 100 ns |
| Max. tach pulse rate | 750 kHz (typ.) |
Transient Capture | |
| Mode | Continuous data recording |
| Maximum rate | 262,144 samples/s for both inputs |
| Maximum capture length | 2 Msamples (single input) 8 Msamples with optional memory |
八度分析 | |
| Standards | Conforms to ANSI standard S1.11- 1986, Order 3, Type 1-D |
| Frequency range | (Band centers) Single channel 1/1 Octave 0.125 Hz to 32 kHz 1/3 Octave 0.100 Hz to 40 kHz 1/12 Octave 0.091 Hz to 12.3 kHz Two channels 1/1 Octave 0.125 Hz to 16 kHz 1/3 Octave 0.100 Hz to 20 kHz 1/12 Octave 0.091 Hz to 6.17 kHz |
| Accuracy | <0.2 dB (1 second stable average, single tone at band center) |
| Dynamic range | 80 dB (1/3 Octave, 2 second stable average) per ANSI S1.11-1986 |
| Sound level | Impulse, Peak, Fast, Slow and L情商 per ANSI S1.4-1983 Type 0 and IEC 651-1979 Type 0 |
订单跟踪 | |
| Delta order | 0.0075 to 1 |
| Resolution | up to 400 lines |
| Amplitude accuracy | ±1 dB (typ.) |
| 显示 | Order map (mag. and phase), order track (mag. and phase), orbit |
曲线拟合和合成 | |
| Type | 20 poles/20 zeros curve fit (non-iterative rational fraction) |
| Order selection | Auto or manual |
| Output format | Pole-zero, polynomial, pole-residue |
Source Output | |
| Amplitude range | 0.1 mVp to 5 Vp |
| Amplitude resolution | 0.1 mVp |
| DC offset | <10.0 mV (typ.) |
| Offset adjust | ±5 VDC (sine, two-tone, swept-sine) |
| Output impedance | <5 Ω, ±100 mA peak output current |
| Sine Source | |
| Amplitude accuracy | ±1 % of setting, 0 Hz to 102.4 kHz, 0.1 Vp to 5 Vp into High-Z load |
| Harmonics, sub-harm. & spurious signals | 0.1 Vp to 5 Vp <-80 dBc (fundamental <30 kHz) <-75 dBc (fundamental <102 kHz) |
| Two-Tone Source | |
| Amplitude accuracy | ±1 % of setting, 0 Hz to 102.4 kHz, 0.1 Vp to 5 Vp into High-Z load |
| Harmonics, sub-harm. | <-80 dBc, 0.1 Vp to 2.5 Vp |
| White Noise Source | |
| Time Record | Continuous or burst |
| Bandwidth | DC to 102.4 kHz or limited to span |
| Flatness | <0.25 dBpp (typ.), 5000 rms averages (<1.0 dBpp (max.)) |
| Pink Noise Source | |
| Bandwidth | DC to 102.4 kHz |
| Flatness | <2.0 dBpp, 20 Hz to 20 kHz (measured using averaged 1/3 Octave Analysis) |
| Chirp Source | |
| Time record | Continuous or Burst |
| 输出 | Sine sweep across the FFT span |
| Flatness | ±0.25 dB (1.0 Vp) |
| Swept-Sine Source | |
| Auto functions | Source Level, Input Range and Frequency Resolution |
| Dynamic range | 145 dB |
| Arbitrary Source | |
| Amplitude range | ±5 V |
| Record length | 2 Msamples (playback from arbitrary waveform memory or capture buffer). Variable output sample rate. |
General | |
| Interfaces | IEEE-488.2, RS-232 and Printer interfaces standard. All instrument functions can be controlled through computer interfaces. A PC (XT) keyboard input is provided for additional flexibility. |
| Hardcopy | Print to dot matrix and PCL compatible printers. Plot to HP-GL or postscript plotters. Print/plot to RS-232 or IEEE-488.2 interfaces or to disk file. Additional file formats include GIF, PCX and EPS. |
| Data storage | USB drive |
| Preamp power | Power connector for SRS preamps |
| Power | 70 W, 100/120/220/240 VAC, 50/60 Hz |