Agilent 35670A
Dynamic Signal Analyzer
Versatile two- or four-channel high-performance
FFT-based spectrum/network analyzer
122 µHz to 102.4 kHz 16-bit ADC
Data Sheet
Key Specifications
Frequency range
102.4 kHz 1 channel
51.2 kHz 2 channel
25.6 kHz 4 channel
90 dB typical
±0.15 dB
±0.04 dB and ±0.5 degrees
25.6 kHz/1 channel
100, 200, 400, 800 & 1600 lines
> 6 Msamples
Random, burst random, periodic chirp, burst chirp,
pink noise, sine, swept-sine ( Option1D2), arbitrary
( Option 1D4)
Dynamic range
Accuracy
Channel match
Real-time bandwidth
Resolution
Time capture
Source types
Summary of Features on Standard Instrument
The following features are standard with the
Agilent 35670A:
Display scaling
Autoscale
Selectable reference
Manual Scale
Linear or log X-axis
Input range tracking
Y-axis log
X & Y scale markers with expand and scroll
Instrument modes
FFT analysis
Correlation analysis
Histogram/time
Time capture
Measurement
Frequency domain
Frequency response
Linear spectrum
Cross spectrum
Power spectrum
Coherence
Power spectral density
Marker functions
Individual trace markers
Coupled multi-trace markers
Absolute or relative marker
Peak search
Harmonic markers
Band marker
Sideband power markers
Waterfall markers
Time parameter markers
Frequency response markers
Time domain (oscilloscope mode)
Time waveform
Autocorrelation
Cross-correlation
Orbit diagram
Amplitude domain
Histogram, PDF, CDF
Trace coordinates
Linear magnitude
Log magnitude
dB magnitude
Group delay
Phase
Unwrapped phase
Real part
Imaginary part
Nyquist diagram
Polar
Signal averaging (FFT mode)
Average types (1 to 9,999,999 averages)
RMS
Time exponential
RMS exponential
Peak hold
Time
Averaging controls
Overload reject
Fast averaging on/off
Update rate select
Select overlap process percentage
Preview time record
Trace units
Y-axis amplitude:
combinations of units, unit value,
calculated value, and unit format describe y-axis amplitude
Units:
volts, g, meters/sec
2
, inches/sec
2
, meters/sec,
inches/sec, meters, mils, inches, pascals, Kg, N, dyn, lb,
user-defined EUs
Unit value:
rms, peak, peak-to-peak
Calculated value:
V, V
2
, V
2
/Hz, √Hz, V
2
s/Hz (ESD)
Unit format:
linear, dB’s with user selectable dB reference,
dBm with user selectable impedance.
Y-axis phase:
degrees, radians
X-axis:
Hz, cpm, order, seconds, user-defined
Measurement control
Start measurement
Pause/continue measurement
Triggering
Continuous (Freerun)
External (analog or TTL level)
Internal trigger from any channel
Source synchronized trigger
GPIB trigger
Armed triggers
Automatic/manual
RPM step
Time step
Pre- and post-trigger measurement Delay
Display formats
Single
Quad
Dual upper/lower traces
Small upper and largelower
Front/back overlay traces
Measurement state
Bode diagram
Waterfall display with skew, -45 to 45 degrees
Trace grids on/off
Display blanking
Screen saver
Tachometer input:
±4 V or ±20 V range
40 mv or 200 mV resolution
Up to 2048 pulses/rev
Tach hold-off control
2
Source outputs
Random
Burst random
Periodic chirp
Burst chirp
Pink noise
Fixed sine
Note: Some source types are not available for use in
optional modes. See option description for details.
Data storage functions
Built-in 3.5 in., 1.44-Mbyte flexible disk also supports
720-KByte disks, and 2 Mbyte NVRAM disk. Both
MS-DOS
®
and HP-LIF formats are available. Data can be
formatted as either ASCII or binary (SDF). The 35670A
provides storage and recall from the internal disk, internal
RAM disk, internal NVRAM disk, or external GPIB disk for
any of the following information:
Instrument setup states
User-math
Time capture buffers
Waterfall display data
Data tables
Trace data
Limit data
Agilent Instrument BASIC
Programs
Curve fit/synthesis tables
Input channels
Anti-alias filters On/Off
AC or DC coupling
LED half range and overload
indicators
Floating or grounded
A-weight filters On/Off
Transducer power supplies (4 ma constant current)
Manual range
Up-only auto range
Up/down auto range
Frequency
20 spans from 195 mHz to 102.4 kHz (1 channel mode)
20 spans from 98 mHz to 51.2 kHz (2 channel mode)
Digital zoom with 244 µHz resolution throughout the
102.4 kHz frequency bands.
GPIB capabilities
Conforms to IEEE 488.1/488.2
Conforms to SCPI 1992
Controller with Agilent Instrument Basic Option
Calibration & memory
Resolution
100, 200, 400, 800 and 1600 lines
Single or automatic calibration
Built-in diagnostics & service tests
Nonvolatile clock with time/date
Time/date stamp on plots and saved data files
Windows
Hann
Flat top
Uniform
Force/exponential
Online help
Access to topics via keyboard or index
Math
+,-,*, /
Magnitude
Square Root
LN
*jω or /jω
Differentiation
Integration
Conjugate
Real and imaginary
FFT, FFT
-1
EXP
PSD
A, B, and C weighting
Constants K1 thru K5
Functions F1 thru F5
Fan
On/Off
Analysis
Limit test with pass/fail
Data table with tabular readout
Data editing
Time capture functions
Capture transient events for repeated analysis in FFT,
octave, order, histogram, or correlation modes (except
swept-sine). Time-captured data may be saved to internal
or external disk, or transferred over GPIB. Zoom on
captured data for detailed narrowband analysis.
3
Agilent 35670A Specifications
Instrument specifications apply after 15 minutes warm-up
and within 2 hours of the last self-calibration. When the
internal cooling fan has been turned OFF, specifications
apply within 5 minutes of the last self-calibration. All speci-
fications are with 400 line frequency resolution and with
anti-alias filters enabled unless stated otherwise.
Frequency
Maximum range**
1 channel mode
Accuracy
±30 ppm (.003%)
Single channel ampltude
Absolute amplitude accuracy (FFT)
(A combination of full scale accuracy, full scale flatness,
and amplitude linearity.)
±2.92% (0.25 dB) 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 (0 dBfs) relative to 1 kHz
±0.2 dB (2.33%)
FFT amplitude linearity at 1 kHz measured on +27 dBVrms
range with time avg, 0 to -80 dBfs
±0.58% (0.05 dB) of reading
±0.025% of full scale
Amplitude resolution
(16 bits less 2 dB over-range) with averaging 0.0019% of
full scale (typical)
Residual DC response (FFT mode)
Frequency display (excludes A-weight filter)
<-30 dBfs or 0.5 mVdc
FFT dynamic range
Spurious free dynamic range
(Includes spurs, harmonic distortion, intermodulation
distortion, alias products). Excludes alias responses at
extremes of span.
Source impedence = 50 Ω.
800 line display.
90 dB typical (<-80 dBfs)
* Option AY6 single channel maximum range extends to 102.4 kHz
without anti-alias filter protection.
** Show all lines mode allows display of up to 131.1, 65.5 and 32.7
kHz respectively. Amplitudes accuracy is unspecified and not alias
protected.
102.4 kHz,
51.2 kHz (opt AY6*)
2 channel mode
51.2 kHz
4 channel mode (Option AY6 only) 25.6 kHz
Spans
1 channel mode
195.3 mHz to 102.4 kHz
2 channel mode
97.7 mHz to 51.2 kHz
4 channel mode (Option AY6 only) 97.7 mHz to 25.6 kHz
Minimimum resolution
1 channel mode
122 µHz (1600 line
display)
2 channel mode
61 µHz (1600 line
display)
4 channel mode (Option AY6 only) 122 µHz (800 line
display)
Maximum real-time bandwidth
FFT span for continuous data acquistion)
(Preset, fast averaging)
1 channel mode
25.6 kHz
2 channel mode
12.8 kHz
4 channel mode (Option AY6 only) 6.4 kHz
Measurement rate
(Typical)
(Preset, fast averaging)
1 channel mode
≥ 70 averages/sec
2 channel mode
≥ 33 averages/sec
4 channel mode (Option AY6 only) ≥ 15 averages/sec
Display update rate
Typical (Preset, fast average off) ≥ 5 updates/Sec
Maximum
≥ 9 updates/Sec
(Preset, fast average off, single channel, single display,
undisplayed trace displays set to data registers)
4
Full span FFT noise floor
(typical)
Flat top window, 64 RMS averages, 800 line display.
Typical noise floor vs. range for different frequency spans
-70 dB/0.03%
dB below
full scale
-80 dB/0.01%
51.2 kHz Span
-90 dB/0.003%
-100 dB/0.001%
6.4 kHz Span
800 Hz Span
-51
0.0028
-41
0.0089
-31
0.028
-21
0.089
-11
0.280
27
22.4
Amplitude range (dBVrms / Vrms)
Harmonic distortion
Single Tone (in band), ≤ 0 dBfs
Intermodulation distortion
Two tones (in-band), each ≤ -6.02 dBfs
Spurious and residual responses
Source impedence = 50 Ω.
Frequency alias responses
<-80 dBfs
<-80 dBfs
<-80 dBfs
Single tone (out of displayed range),
≤ 0 dBfs, ≤ 1 MHz
(≤ 200 kHz with IEPE transducer power
supply On)
2.5% to 97.5% of the frequency span
Lower and upper 2.5% of frequency span
<-80 dBfs
<-65 dBfs
Input noise
Input noise level
Flat top window, -51 dBVrms range
Source impedance = 50 Ω
Above 1280 Hz
<-140 dBVrms/√
2
Hz
160 Hz to 1280 Hz
<-130 dBVrms/√
2
Hz
Note: To calculate noise as dB below full scale:
Noise [dBfs] = Noise [dB/√
2
Hz] + 10LOG(NBW) - Range
[dBVrms]; where NBW is the noise equivalent BW of the
window (see below).
Window parameters
-3 dB bandwidth*
Noise equivalent bandwidth*
Attenuation at ±½ bin
Shape factor
(-60 dB BW/-3 dB BW)
Uniform
0.125% of span
0.125% of span
4.0 dB
716
Hann
0.185% of span
0.1875% of span
1.5 dB
9.1
Flat top
0.450% of span
0.4775% of span
0.01 dB
2.6
* For 800 line displays. With 1600, 400, 200, or 100 line displays, multiply bandwidths by 0.5, 2, 4, and 8, respectively.
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