Agilent 35670A Data Sheet

Agilent 35670A

Dynamic Signal Analyzer

Technical Specifications

Key Specifications
Frequency Range 102.4 kHz 1 channel

51.2 kHz 2 channel

25.6 kHz 4 channel

Dynamic Range 90 dB typical

Accuracy ±0.15 dB

Channel Match ±0.04 dB and ±0.5 degrees

Real-time Bandwidth 25.6 kHz/1 channel

Resolution 100, 200, 400, 800 & 1600 lines

Time Capture 0.8 to 5 Msamples (option UFC)

Source Types Random, Burst random, Periodic chirp,

Burst chirp, Pink noise, Sine,
Swept-Sine (option1D2), Arbitrary (option 1D4)

Versatile two- or four-channel high-performance
FFT-based spectrum/network analyzer

122 µHz to 102.4 kHz 16-bit ADC

MARKER

Marker

A

Marker
Fctn

E

DISPLAY

Meas
Data

Tra ce
Coord

Scale

Active
Tra ce

Analys Disp

Format

B

C

D

F

G

H

MEASUREMENT

Freq

Window

Input Source

Trigger

Inst
Mode

J

K

L

N

O

P

R

S

T

Start

Pause
Cont

Avg

CH 3 CH 4

Over

Half

mic pwr

Float ± 4V pk Max

Over

Half

CH 1 CH 2

Source

7

8

9

45

6

12

3

0

•

+/-

I

M

Q

Mkr
Valu e

Back
Space

POWER

Preset Help

BASIC System

Utility

Plot/
Print

UVW

SYSTEM

Local/
HP-IB

Disk
Utility

XY

Save/
Recall

Z

F1

F2

F3

F4

F5

F6

F7

F8

F9

Rtn

35670A

DYNAMIC SIGNAL ANALYZER

2

Summary of Features
on Standard Instrument

The following features are standard
with the Agilent 35670A:

Instrument Modes

FFT Analysis Histogram/Time
Correlation Analysis Time Capture

Measurement

Frequency Domain

Frequency Response Power Spectrum
Linear Spectrum Coherence
Cross Spectrum Power Spectral

Density

Time Domain (oscilloscope mode)

Time Waveform Autocorrelation
Cross-Correlation Orbit Diagram

Amplitude Domain

Histogram, PDF, CDF

Trace Coordinates

Linear Magnitude Unwrapped Phase
Log Magnitude Real Part
dB Magnitude Imaginary Part
Group Delay Nyquist Diagram
Phase Polar

Trace Units

Y-axis Amplitude: combinations of units, unit value,
calculated value, and unit format describe y-axis
amplitude

Units:

volts, g, meters/sec2, inches/sec2,
meters/sec, inches/sec, meters, mils, inches,
pascals, Kg, N, dyn, lb, user-defined EUs

Unit Value:

rms, peak, peak-to-peak

C

alculated Value:

V, V2, V

2

/Hz, √

—

Hz, V2s/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

Display Formats

Single
Quad
Dual Upper/Lower Traces
Small Upper and Large Lower
Front/Back Overlay Traces
Measurement State
Bode Diagram
Waterfall Display with Skew, -45 to 45 Degrees
Trace Grids On/Off
Display Blanking
Screen Saver

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

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

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

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

Tachometer Input:

±4V or ±20V range
40 mv or 200 mV resolution
Up to 2048 pulses/rev
Tach hold-off control

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.

Input Channels

Manual Range Anti-alias Filters On/Off
Up-Only Auto Range AC or DC Coupling
Up/Down Auto Range LED Half Range and

Overload Indicators
Floating or Grounded A-Weight Filters On/Off
Transducer power supplies (4 ma constant current)

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.

Resolution

100, 200, 400, 800 and 1600 lines

Windows

Hann Uniform
Flat Top Force/Exponential

Math

+,-,∗, / Conjugate
Magnitude Real and Imaginary
Square Root FFT, FFT

-1

LN EXP
∗jω or /jω PSD
Differentiation A, B, and C weighting
Integration Constants K1thru K5

Functions F1 thru F5

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. Up to 750K samples of data
can be saved in the standard unit.

Data Storage Functions

Built-in 3.5 in., 1.44-Mbyte flexible disk also sup­ports 720-KByte disks, and 128-Kbyte 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 Trace Data
User-Math Limit Data
Time Capture Buffers Agilent Instrument BASIC
Waterfall Display Data Programs
Data Tables Curve Fit/Synthesis
Tables

Interfaces

GPIB (IEEE-488.1 and 488.2)
Parallel
RS-232C Serial

Hard-Copy Output

To Serial or Parallel HP-GL Plotters
To Raster Printers
To Serial or Parallel HP-GL Printers
To Disk File (Supports Raster Printer, HP-GL Plotter,
and HP-GL Printer)
Time Stamp

GPIB Capabilities

Listener/Talker (Direct control of plotters, printers,
disk drives)
Conforms to IEEE 488.1/488.2
Conforms to SCPI 1992
Controller with Agilent Instrument Basic option

Standard Data Format (SDF) Utilities

Exchange data between virtually all Agilent
Dynamic Signal Analyzers
Easy data transfer to spreadsheets
Data transfer to MATRIXXand Matlab

SDF utilities run in an external PC

Calibration & Memory

Single or Automatic Calibration
Built-In Diagnostics & Service Tests
Nonvolatile Clock with Time/Date
Time/Date Stamp on Plots and Saved Data Files

Online Help

Access to Topics via Keyboard or Index

Fan

On/Off

MS-DOS

®

is a U.S. registered trademark of

Microsoft Corporation.

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 specifications are with 400 line frequency
resolution and with anti-alias filters enabled
unless stated otherwise.

Frequency

Maximum Range**

1 Channel Mode 102.4kHz,

51.2 kHz (option 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/Second
2 Channel Mode ≥ 33 Averages/Second
4 Channel Mode (option AY6 only) ≥ 15 Averages/Second

Display Update Rate

Typical

(Preset, Fast Average OFF)

≥ 5 Updates/Second

Maximum ≥ 9 Updates/Second

(Preset, Fast Average Off, Single Channel,
Single Display, Undisplayed Trace Displays
set to Data Registers)

Accuracy ±30 ppm (.003%)

* 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.

Single Channel Ampltude

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 (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% (0.05dB) 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 90 dB typical (<-80 dBfs)

(Includes Spurs, Harmonic Distortion,
Intermodulation Distortion, Alias Products)
Excludes alias responses at extremes of span.
Source impedence = 50Ω.
800 Line Display.

Full Span FFT Noise Floor (typical)
Flat Top Window, 64 RMS Averages, 800 Line Display.

Harmonic Distortion <-80 dBfs
Single Tone (in band), ≤ 0 dBfs

Intermodulation Distortion <-80 dBfs
Two tones (in-band), each ≤-6.02 dBfs

Spurious and Residual Responses <-80 dBfs
Source impedence = 50Ω.

Frequency Alias Responses

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 <-80 dBfs

Lower and Upper 2.5% of Frequency Span <-65 dBfs

Input Noise

Input Noise Level

Flat Top Window, -51 dBVrms range
Source Impedance = 50Ω

Above 1280 Hz <-140 dBVrms/√



Hz

160 Hz to 1280 Hz <-130 dBVrms/√



Hz

Note: To calculate Noise as dB below Full Scale:

Noise [dBfs] = Noise [dB/√



Hz] + 10LOG(NBW) - Range[dBVrms]; where NBW is the Noise

Equivalent BW of the Window (see below).

Window Parameters Uniform Hann Flat Top

-3 dB Bandwidth* 0.125% of Span 0.185% of Span 0.450% of Span

Noise Equivalent Bandwidth* 0.125% of Span 0.1875% of Span 0.4775% of Span

Attenuation at ±1/2 Bin 4.0 dB 1.5 dB 0.01 dB

Shape Factor 716 9.1 2.6
(-60 dB BW/-3 dB BW)

dB below
Full Scale

Typical Noise Floor vs. Range for Different Frequency Spans

-51 -41 -31 -21 -11 27

0.0028 0.0089 0.028 0.089 0.280 22.4

-100 dB/0.001%

Amplitude Range (dBVrms / Vrms)

-90 dB/0.003%

-80 dB/0.01%

-70 dB/0.03%

51.2 kHz Span

6.4 kHz Span

800 Hz Span

* For 800 line displays. With 1600, 400, 200, or

100 line displays, multiply bandwidths
by 0.5, 2, 4, and 8, respectively.

Single Channel Phase

Phase Accuracy Relative to

±4.0 deg

External Trigger

16 Time Averages
Center of Bin, DC Coupled
0 dBfs to -50 dBfs Only
0 Hz < freq ≤ 10.24 kHz Only

For Hann and Flat Top windows, phase is
relative to a cosine wave at the center of the
time record. For the Uniform, Force, and
Exponential windows, phase is relative to a
cosine wave at the beginning of the time
record.

Cross-Channel Amplitude

FFT Cross-Channel ±0.04 dB (0.46%)
Gain Accuracy

Frequency Response Mode

Same Amplitude Range

At Full Scale: Tested with10 RMS
Averages on the -11 to +27 dBVrms
Ranges, and 100 RMS Averages
on the -51 dBVrms Range

Cross-Channel Phase

Cross-Channel Phase Accuracy ±0.5 deg

(Same conditions as
Cross-Channel Amplitude)

5

Input

Input Ranges

(full scale)

(Auto-Range Capability) +27 dBVrms (31.7 Vpk) to -51 dBVrms

(3.99 mVpk) in 2 dB steps

Maximum Input Levels 42 Vpk
Input Impedance 1 MΩ ±10%

90 µF nominal

Low Side to Chassis Impedance 1 MΩ ±30% (typical)

Floating Mode <0.010µF
Grounded Mode ≤100Ω

AC Coupling Rolloff <3 dB rolloff at 1Hz
Source Impedance = 50Ω

Common Mode Rejection Ratio

Single Tone at or below 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

(floating mode

) ± 4V pk

IEPE Transducer Power Supply

Current Source 4.25 ± 1.5 mA
Open Circuit Voltage +26 to +32 Vdc

A-Weight Filter Type 0 tolerance
Conforms to ANSI Standard
S1.4-1983; and to IEC 651-1979;
10 Hz to 25.6 kHz

Crosstalk

Between Input Channels, and <-135 dB below signal or
Source-to-Input (Receiving Channel <-80 dBfs of receiving channel, whichever
Source Impedance = 50Ω) response is greater in amplitude

Time Domain

Specifications apply in Histogram/Time Mode, and unfiltered time display

DC Amplitude Accuracy ±5.0 %fs

Rise Time of -1V to 0V Test Pulse <11.4 µSec

Settling Time of -1V to 0V Test Pulse <16 µSec to 1%

Peak Overshoot of -1V to 0V Test Pulse <3%

Sampling Period

1 Channel Mode 3.815 µSec to 2 Sec in 2x Steps
2 Channel Mode 7.629 µSec to 4 Sec in 2x Steps
4 Channel Mode (Option AY6 Only) 15.26 µSec to 8 Sec in 2x Steps

Trigger

Trigger Modes Internal, Source,

External (analog
setting) GPIB

Maximum Trigger Delay

Post Trigger 8191 seconds
Pre Trigger 8191 sample periods

No two channels can be further than
±7168 samples from each other.

External Trigger Max Input ±42 Vpk

External Trigger Range

Low Range -2V to +2V
High Range -10V to +10V

External Trigger Resolution

Low Range 15.7 mV
High Range 78 mV

Tachometer

Pulses per Revolution 0.5 to 2048
RPM 5 ≤ RPM ≤ 491,519

RPM Accuracy ±100 ppm (0.01%)

(Typical)

Tach Level Range

Low Range -4V to +4V
High Range -20V to +20V

Tach Level Resolution

Low Range 39 mV
High Range 197 mV

Maximum Tach Input Level ±42 Vpk

Minimum Tach Pulse Width 600 nSec

Maximum Tach Pulse Rate 400 kHz

(Typical)

6

Source Output

Source Types Sine, Random Noise, Chrip,Pink Noise, Burst

Random, Burst Chirp

Amplitude Range AC: ±5V peak*

DC: ±10V*
* Vac

pk

+ |Vdc| ≤ 10V

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

Pink Noise Adder Add 600 mV typical when using pink noise
Output Impedance < 5Ω

Maximum Loading

Current ±20 mA peak
Capacitance 0.01 µF

Sine Amplitude Accuracy at 1 kHz ±4% (0.34 dB) of setting
Rload > 250Ω

0.1 Vpk to 5 Vpk

Sine Flatness (relative to 1 kHz) ±1 dB

0.1V to 5V peak

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

Digital Interfaces

External Keyboard Compatible with PC-style 101-key keyboard

model number HP C4950B (#ABA) and
C1405-60015 mini DIN to DIN adapter.

GPIB

Conforms to the following standards:

IEEE 488.1 (SH1, AH1, T6, TE0, L4, LE0, SR1, RL1,
PP0, DC1, DT1, C1, C2, C3, C12, E2)

IEEE 488.2-1987 Complies with SCPI 1992

Data Transfer Rate <45 mSec for a 401 point trace

(REAL 64 Format)

Serial Port

Parallel Port

External Multisync Monitor Port

7

Computed Order Tracking - Option 1D0

Maximum Order x Maximum RPM

≤

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 5 ≤RPM ≤ 491,519

(Maximum useable RPM is limited by
Resolution, Tach Pulse Rate,Pulses/Revolution
and Average Mode Settings.)

Delta Order 1/128 to 1/1
Resolution ≤ 400

(Maximum Order) / (Delta Order)

Maximum RPM Ramp Rate 1000 RPM / second real-time (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 sum of 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

Tested with 11 dBVrms
source level at: 100 mSec
integration

Arbitrary Waveform Source - Option 1D4

Amplitude Range AC: ±5V peak*

DC: ±10V*
* Vac

pk

+ |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

General Specifications

Safety Standards CSA Certified for Electronic Test and

Measurement Equipment per CSA

C22.2, NO. 231

This product is designed for compliance to:
UL1244, Fourth Edition
IEC 348, 2nd Edition, 1978

EMI / RFI Standards CISPR 11

Acoustic Power LpA < 55 dB

(Cooling Fan at High Speed Setting)

< 45 dB

(Auto Speed Setting at 25 °C)

Fan Speed Settings of High, Automatic, and Off are available. The Fan Off setting can be enabled
for a short period of time, except at higher ambient temperatures where the fan will stay on.

Environmental Operating Restrictions

Operating: Operating: Storage &

Disk In Drive No Disk In Drive Transport

Ambient Temp. 4 °C to 45 °C 0 °C to 55 °C -40 °C to 70 °C

Relative Humidity
(non-condensing)
Minimum 20% 15% 5%
Maximum 80% at 32 °C 95% at 40 °C 95% at 50 °C

Vibrations 0.6 Grms 1.5 Grms 3.41 Grms

(5 - 500 Hz)

Shock 5G (10 mSec 1/2 sine) 5G (10 mSec 1/2 sine) 40G (3 mSec 1/2 sine)

Max. Altitude 4600 meters 4600 meters 4600 meters

(15,000 ft.) (15,000 ft.) (15,000 ft.)

AC Power 90 Vrms - 264 Vrms

(47 - 440 Hz)

350 VA maximum

DC Power 12 VDC to 28 VDC Nominal

200 VA maximum

DC Current at 12V standard: <10A typical

4 channel: <12A typical

Warm-Up Time 15 minutes

Weight 15 kg (33 lb) net

29 kg (64 lb) shipping

Dimensions (Excluding Bail Handle and Impact Cover)

Height 190 mm (7.5")
Width 340 mm (13.4")
Depth 465 mm (18.3")

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.

Product specifications and descriptions in this
document subject to change without notice.
Copyright © 1994, 1998, 2000 Agilent Technologies
Printed in U.S.A. 5/00
5966-3064E

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