HP 35670A 2- or 4-channel DC -102.4 kHz FFT Dynamic Signal Analyzer

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The HP 35670A dynamic is a portable two- or four-channel dynamic signal analyzer with the versatility to be several instruments at once. Rugged and portable, it's ideal for field work, yet it has the performance and functionality required for demanding R&D applications. Optional features optimize the instrument for troubleshooting mechanical vibration and noise problems, characterizing control systems, or general spectrum and network analysis.


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Frequency




Maximum Range
1 Channel Mode	102.4kHz, 51.2 kHz
		(option AY6 - single channel maximum range extends to
		102.4 kHz without anti-alias filter protection.)
2 Channel Mode	51.2 kHz	
4 Channel Mode 	25.6 kHz (option AY6 only)


Spans	
1 Channel Mode	195.3 µHz to 102.4 kHz
2 Channel Mode	97.7 µHz to 51.2 kHz
4 Channel Mode 	48.8 µHz to 25.6 kHz (option AY6 only)


Minimimum Resolution 
1 Channel Mode	122 µHz (1600 line display)
2 Channel Mode	61 µHz (1600 line display)
4 Channel Mode 	61 µHz (800 line display) (option AY6 only)

Maximum Real-Time Bandwidth
(FFT Span for Continuous Data Acquisition)
(Preset, Fast Averaging)	
1 Channel Mode	25.6 kHz	
2 Channel Mode	12.8 kHz	
4 Channel Mode 	6.4 kHz (option AY6 only)


Measurement Rate (Typical)
(Preset, Fast Averaging)	
1 Channel Mode	> 70 Averages/Second
2 Channel Mode	> 33 Averages/Second
4 Channel Mode 	> 15 Averages/Second (option AY6 only)


Display Update Rate 
Typical	> 5 Updates/Second  (Preset, Fast Average OFF)
Maximum > 9 Updates/Second  (Preset, Fast Average Off, Single Channel,
			     Single Display, Undisplayed Trace Displays
			     set to Data Registers)

Accuracy
±30 ppm (.003%)






Amplitude/Phase


Absolute Amplitude Accuracy (FFT)
(A combination of Full Scale Accuracy, Full Scale Flatness, 
and Amplitude Linearity.)
±2.92% (0.25dB) of Reading
±0.025% of Full Scale


FFT Full Scale Accuracy at 1 kHz (0 dBfs)
±0.15 dB (1.74%)


FFT Full Scale Flatness 
(Relative to 1 kHz)
±0.2 dB (2.33%)


FFT Amplitude Linearity at 1 kHz:
±0.58% (0.05dB) of reading ±0.025% of full scale
(Measured on +27 dBVrms range with time avg, 0 to -80 dBfs)



Amplitude Resolution 
(with averaging)
16 bits less 2 dB over-range 
0.0019% of full scale (typical)


FFT Cross-Channel Gain Accuracy: ±0.04 dB (0.46%)
(Frequency Response Mode)


Cross-Channel Phase Accuracy 0.5 deg 






Dynamic Range


Spurious Free Dynamic Range:  90 dB typical(<-80 dBfs)
(Includes Spurs, Harmonic Distortion, Intermodulation Distortion, Alias
Products). 
800 Line Display.

Source impedence: 50 Ohm. 


Harmonic Distortion: <-80 dBfs


Intermodulation Distortion: <-80 dBfs


Spurious and Residual Responses: <-80 dBfs	


Frequency Alias Responses
2.5% to 97.5% of the Frequency Span 	<-80 dBfs
Lower and Upper 2.5% of Frequency Span	<-65 dBfs


Input Noise Level  
(Flat Top Window, -51 dBVrms range, Source Impedance = 50 Ohm)
Above 1280 Hz: <-140 dBVrms/ sq.root Hz
160 Hz to 1280 Hz: <-130 dBVrms/ sq.root Hz


	






Input


Input Ranges: +27 dBVrms (31.7 Vpk) to -51 dBVrms (3.99 mVpk) in 2 dB steps	
(full scale)      
      
Maximum  Input Levels: 42 Vpk

Input Impedance: 1 M Ohm ±10% 90 pF nominal

AC Coupling Rolloff: <3 dB rolloff at 1Hz
(Source Impedance  = 50 Ohm)	

Common Mode Rejection Ratio:
Single Tone at orbelow 1 kHz
-51dBVrms 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: ± 4 V pk
(floating mode)  

IEPE Signal Conditioning
Current Source:                     4.25 ± 1.5 mA 
Open Circuit Voltage:               +26 to +32 Vdc

Crosstalk
Between Input Channels, and Source-to-Input  
<-135 dB below signal or <-80 dBfs of receiving channel, whichever
response is greater in amplitude






Trigger/Tachometer


Trigger Modes:      Internal, Source, External (analog setting) HP-IB

Maximum Trigger Delay
Post Trigger:       8191 seconds
Pre Trigger:        8191 sample periods


External Trigger Range	
Low Range:          -2 V to +2 V
High Range:         -10 V to +10 V

Pulses per Revolution:    0.5 to 2048

RPM Range        5 =< RPM =< 491,519
Accuracy:        ±100 ppm (0.01%) (Typical)     

Tach Level Range
Low Range:       -4 Vto +4 V
High Range:      -20 V to +20 V

Maximum Tach Pulse Rate:  400 kHz (typical)






Source Output


Source Types:       Sine, Random Noise, Chirp, Pink Noise,
		    Burst Random, Burst Chirp

Amplitude Range	
AC: ±5 V peak*
DC: ±10 V*
* Vacpk + |Vdc| =/<  10 V

AC Amplitude Resolution
Voltage => 0.2 Vrms:    2.5 mVpeak
Voltage < 0.2 Vrms:     0.25 mVpeak

DC Offset Accuracy:     ±15 mV ± 3% of (|DC| + Vacpk) Settings

Output Impedance:       < 5  Ohm

Sine Amplitude Accuracy at 1 kHz:       ±4% (0.34 dB) of setting
(Rload >250 Ohm, 0.1Vpk to 5Vpk)

Harmonic and Sub-Harmonic Distortion and Spurious Signals (In Band)
(0.1 Vpk to 5 Vpk Sine Wave)
Fundamental <30 kHz:      <-60 dBc
Fundamental >30 kHz:      <-40 dBc






Options


COMPUTED ORDER TRACKING - Option 1D0

   Maximum Order x Maximum RPM     
 --------------------------------  =< 102,400 Hz
              60

Online (Real Time)	
1 Channel Mode  25,600 Hz 
2 Channel Mode  12,800 Hz
4 Channel Mode  6,400 Hz

Capture Playback	
1 Channel Mode  102,400 Hz
2 Channel Mode  51,200 Hz
4 Channel Mode  25,600 Hz

Number of Orders: =<200         

Delta Order:      1/128 to 1/1

Resolution
(Maximum Order) / (Delta Order):	= < 400

Maximum RPM Ramp Rate:    1000 RPM / second (typical) 
1000 - 10,000 RPM Run Up
Maximum Order   = 10
Delta Order     = 0.1
RPM Step        = 30    (1 Channel)
                = 60    (2 Channel)
                = 120   (4 Channel)	

Order Track Amplitude Accuracy:        ±1 dB (typical)	



Real Time Octave Analysis - Option 1D1

Standards
Conforms to ANSI Standard S1.11 - 1986, Order 3, Type 1-D, Extended and
Optional Frequency Ranges
Conforms to IEC 651-1979 Type 0 Impulse , and ANSI S1.4 

Frequency Ranges (at centers)

Online (Real Time):	
                Single Channel          2 Channel               4 Channel
1/1 Octave      0.063 - 16 kHz          0.063-8 kHz             0.063 - 4 kHz
1/3 Octave      0.08 - 40 kHz           0.08 - 20 kHz           0.08 - 10 kHz
1/12 Octave     0.0997 - 12.338 kHz     0.0997 - 6.169 kHz      0.0997 - 3.084 kHz	

Capture Playback:	
1/1 Octave      0.063 - 16 kHz          0.063 - 16 kHz          0.063 - 16 kHz
1/3 Octave      0.08 - 31.5 kHz         0.08 - 31.5 kHz         0.08 - 31.5 kHz
1/12 Octave     0.0997 - 49.35 kHz      0.0997 - 49.35 kHz      0.0997 - 49.35 kHz	
One to 12 octaves can be measured and displayed.
1/1-, 1/3-, and 1/12-octave true center frequencies related by the formula:

  f(i+1)/f(i) = 2^(1/n);  n=1, 3, or 12

  Where 1000 Hz is the reference for 1/1, 1/3 Octave, and 1000*2^(1/24)
  Hz is the reference for 1/12 octave.  The marker returns the ANSI
  standard preferred frequencies.

Accuracy 
1 Second Stable Average	
Single Tone at Band Center:       =/<  ± 0.20 dB 
(Readings are taken from the Linear Total Power Spectrum Bin .  It is
derived from sumof each filter.)

1/3-Octave Dynamic Range:  >80 dB (typical) per ANSI S1.11-1986
(2 Second Stable Average, total power limited by input noise level)



Swept Sine Measurements - Option 1D2

Dynamic Range:      130 dB 



	
Arbitrary Waveform Source - Option 1D4

Amplitude Range	
AC:       ±5 V peak*
DC:       ±10 V*
* Vacpk + |Vdc| <=10V

Record Length     # of Points = 2.56 x Lines of Resolution, 
                  or 
                  # of Complex Points = 1.28 x Lines of Resolution

DAC Resolution
0.2828 Vpk to 5 Vpk       2.5 mV
0  Vpk to 0.2828 Vpk      0.25 mV	






Abbreviations


dBVrms = dB relative to 1 Volt rms.

dBfs = dB relative to full scale amplitude range.  Full scale is approx.
2 dB below ADC overload.

Typical = typical, non-warranted, performance specification included to
provide general product information.


[ Summary ][ Features ][ Specifications ][ Key Literature ][ Ordering ][ Assistance ][ Related ] 

HP 35670A	DC-102.4 kHz FFT Dynamic Signal Analyzer
   Opt 0B0      Delete manual set
   Opt 0B1      Add manual set
   Opt 0B3      Service manual
   Opt 0BU      Additional instrument BASIC manuals
   Opt 1BH      General export license version
   Opt 1BP      Mil std 45662A calibration w/ test data
   Opt 1C2      Add HP instrument BASIC
   Opt 1D0      Computed order tracking
   Opt 1D1      Real time octave measurements
   Opt 1D2      Swept sine measurement
   Opt 1D3      Curve fit/synthesis
   Opt 1D4      Arbitrary source
   Opt 1F0      PC-style keyboard - U.S. version
   Opt 1F1      PC-style keyboard - German version
   Opt 1F2      PC-style keyboard - Spanish version
   Opt 1F3      PC-style keyboard - French version
   Opt 1F4      PC-style keyboard - U.K. version
   Opt 1F5      PC-style keyboard - Italian version
   Opt 1F6      PC-style keyboard - Swedish version
   Opt AB1      Korea - Korean localization
   Opt AB2      China - Chinese localization
   Opt ABD      Germany - German localization
   Opt ABE      Spain - Spanish localization
   Opt ABF      France - French localization
   Opt ABJ      Japan - Japanese localization
   Opt ABZ      Italy - Italian localization
   Opt AN2      Add 4 MB RAM
   Opt AX4      Rack flange kit
   Opt AY6      Add 2 input channels
   Opt UFC      Add 8 MB RAM
   Opt UFF      Add 1 MB nonvolatile RAM
   Opt UK4      Microphone adapter and power supply
   Opt UK5      Carrying case
   Opt UK6      Commercial cal. certificate w/ test data
   Opt W30      3 Year Return Repair Service
   Opt W32      3 Year Cust Return Calibration Service
   Opt W34      3 Year Standards Compliant Cal Service
   Opt W50      5 Year Return Repair Service
   Opt W52      5 Year Cust Return Calibration Service
   Opt W54      5 Year Standards Compliant Cal Service

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HP 35670A Product Overview ( PDF)
HP 35670A Technical Specifications ( PDF)

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Page Updated: Friday February 12 00:58:01 UTC 1999