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

Octave Analysis

Standards

Conforms to ANSI standard S1.11- 1986, Order 3, Type 1-D

Frequency ra, nge

(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_eq per ANSI S1.4-1983 Type 0 and IEC 651-1979 Type 0

Order Tracking

Delta order

0.0075 to 1

Resolution

up to 400 lines

Amplitude accuracy

±1 dB (typ.)

Displays

Order map (mag. and phase), order track (mag. and phase), orbit

Curve Fit and Synthesis

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

Output

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

CRT monitor

Monochrome, 800H by 600V resolution

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.

Disk

3.5' DOS format, 1.44 Mbytes

Preamp power

Power connector for SRS preamps

Power

70 W, 100/120/220/240 VAC, 50/60 Hz

Dimensions

17' × 8.25' × 24' (WHL)

Weight

56 lbs.

Warranty

One year parts and labor on defects in materials and workmanship