HP 35670A
Dynamic Signal
Analyzer
Product Overview
The HP 35670A
shown with Four Channels
(option AY6)
Versatile two- or
four-channel
high-performance
FFT-based spectrum/
network analyzer
µµ
122
µHz to 102.4 kHz
µµ
16-bit ADC
Frequency Range 102.4 kHz 1 channel
Dynamic Range 90 dB typical
Accuracy ±0.15 dB
Channel Match ±0.04 dB and
Real-time Bandwidth 25.6 kHz/1 channel
Resolution 100, 200, 400 & 800 lines
Time Capture 0.8 to 5 Msamples
Source Types Random, Burst random,
51.2 kHz 2 channel
25.6 kHz 4 channel
±0.5 degrees
(option UFC)
Periodic chirp, Burst
chirp, Pink noise, Sine,
Swept-Sine (option1D2),
Arbitrary (option 1D4)
The HP 35670A 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.
Take the HP 35670A
where it’s needed!
Whether you’re moving an instrument
around the world or around the lab,
portability is a real benefit. Small
enough to fit under an airplane seat,
the HP 35670A goes where it’s
needed. But there’s more to portability than size. Like a nominal 12- to
28-volt dc power input and selfcontained features that do not require
external hardware, such as built-in
piezoelectric integrated circuit power
supply, analog trigger and tachometer
inputs, and optional computed order
tracking.
Versatile enough to be
your only instrument for
low frequency analysis
With the HP 35670A, you carry
several instruments into the field in
one package. Frequency, time, and
amplitude domain analysis are all
available in the standard instrument.
Build on that capability with options
that either add new measurement
capability or enhance all measurement modes.
AY6 Add Two Channels (Four Total)
1D0 Computed Order Tracking
1D1 Real-Time Octave
Measurements
UK4 Microphone Adapter and
Power Supply
1D2 Swept-Sine Measurements
1D3 Curve Fit and Synthesis
1D4 Arbitrary Waveform Source
1C2 HP Instrument BASIC
UFF Add 1-Mbyte NVRAM
AN2 Add 4-Mbyte RAM
(8 Mbytes Total)
UFC Add 8-Mbyte RAM
(12 Mbytes Total)
100 1D0 - 1D4/UFC bundle
Laboratory-quality
measurements in the field
Obtain all of the performance of your
bench-top analyzer in a portable
instrument.
Ease-of-use
Portability, versatility, and performance are valued attributes, but to be
really valuable an instrument must
also be easy to use. The HP 35670A
has a friendly front panel, plus online
help that’s always available to answer
your questions. An interactive
measurement state lets you configure
the instrument setup from a single
display.
HP 35670A Dynamic Signal Analyzer
Versatile
Measurement Modes
Standard and optional
measurement modes include:
• FFT Analysis
• Real-Time Octave Analysis
HP Instrument BASIC
(Option 1C2)
Develop a custom userinterface, integrate
several instruments and
peripherals into a system
using the HP 35670A as
the system controller,
or simply automate
measurements.
Shown with
option AY6 Add Two
Channels
(option 1D1)
• Order Analysis (option 1D0)
• Swept-Sine (option 1D2)
• Correlation Analysis
• Histogram Analysis
• Time Capture
All measurement options
may be retrofitted.
RPM Display
Read RPM in any
measurement mode
Powerful Markers
Extract information
from measurement
data with trace and
special markers:
• Individual Trace
• Coupled Trace
• Absolute or Relative
• Peak Search
• Harmonic
• Band
• Sideband Power
• Waterfall
• Time Parameter
• Frequency and
Damping
Built-In 3.5 inch
Flexible Disk Drive
Store instrument
states, programs, time
captured data,
waterfall data, trace
data, limits, math
functions, data tables,
and curve fit/synthesis
tables.
Supported disk formats
are HP-LIF and
MS-DOS. Internal RAM
may also be formatted
as storage disk.
Online Help
Applications
oriented help
is just a few
keystrokes away.
Input Channels
• Analog A-weighted
filters (switchable)
• Transducer
sensitivity input
• Engineering units:
g, m/s2, m/s, m, in/s2,
in/s, in, mil, kg, dyn,
lb, N, and pascals
• Built-in 4 mA
constant current
Large 6.9 inch
(17.5 cm) display
Display area is not
compromised by
portability
power supply
Precision
Measurements
• 16-bit ADC
• ±0.15 dB spectrum
ampltude accuracy
• ±0.04 dB, ±0.5
degrees channel
match (full scale)
• 90 dB dynamic
range (typical)
• 130 dB dynamic
range with sweptsine (option 1D2)
• Up/Down autorange
• Up only autorange
2
Math Functions
Powerful math and
data editing functions
to quickly modify
measurement results.
(Curve fit and
frequency response
synthesis available
with option 1D3.)
Source Types
• Random Noise
• Burst Random
Noise
• Periodic Chirp
• Burst Chirp
• Pink Noise
• Fixed Sine
• Arbitrary
Waveform
Source
(Option 1D4)
• Swept-Sine
Source
(Option 1D2)
Note: The
source is
located on
the front panel
of a standard
two-channel
HP 35670A.
HP-IB Connector
Integrate the
HP 35670A with
other instruments
and peripherals for
system operation or
printing/plotting.
System controller
for HP-IB (IEEE-
488.1 and 488.2)
compatible
instrumentation via
HP Instrument
BASIC (option 1C2).
Provides direct
control of HP-IB
printers, plotters,
and HP SS80 disk
drives.
Serial Port
Plot to HP-GL
plotters or print to
HP-GL and raster
printers.
Parallel Port
Plot to HP-GL plotters
or print to HP-GL and
raster printers.
DC Power
Accepts 12 to 28 volts
dc (nominal). Use the
HP 35250A power
cable for DC power
source connection, or
the HP 35251A power
cable with cigarettelighter adapter.
Low Noise Fan
Fan may be turned
off for acoustic
applications.
Running speed
depends on
ambient
temperature.
External Trigger
(42 Volt Peak Max)
No external signal
conditioning
hardware required.
Triggers on selected
level between
±10 volts.
Keyboard
Use a standard PC
keyboard to title data,
edit HP Instrument
BASIC programs,
or to operate the
instrument.
Tachometer
(42 Volt Peak Max)
No external signal
conditioning hardware
required. Reads
frequency (RPM) on
selected levels
between ±20 volts.
Power Select
Switch between
ac and dc power
sources without
interrupting
instrument
operation.
External Monitor
Drive a multisync
monitor for remote
viewing by large
groups.
3
AC Power
Universal power
supply will
operate with any
combination of
voltage between
100 and 240 VAC
and line
frequency
between 47 and
440 Hz. The
maximum power
requirement is
350 VA.
Spectrum Analysis
FFT-based spectrum analyzers, such
as the HP 35670A, are ideal for
measuring the spectra of lowfrequency signals like speech or
mechanical vibration. Transient
components, usually missed with
swept-frequency analyzers, are easily
measured and displayed at speeds
fast enough to follow trends. The
HP 35670A has both the performance
and features required to take full
advantage of this technology.
16-Bits for High Performance
With a 16-bit ADC (90 dB typical
dynamic range) and a real-time
bandwidth of 25.6 kHz, you can be
sure nothing will be missed. Resolve
signals using 100 to 1600 lines
resolution, or for really close-in
analysis, use frequency zoom to
resolve signals with up to 61 µHz
resolution. Use time or RPM arming
to develop waterfalls of sequential
vibration spectra for trend analysis or
for an overview of device vibration.
Averaging
Various averaging modes let you
further refine spectrum analysis
measurements. Time averaging
extracts repetitive signals out of the
noise while rms averaging reduces
the noise to its mean value. Exponential averaging, available for both time
and rms averaging, is useful for
reducing the noise while following
changing signals—tracking the
resonance shifts in a fatiguing
structure for example.
Power and Linear Spectrums
Match your spectrum measurement
mode to the signal being tested. Use
linear spectrum analysis to measure
both the amplitude and phase of
periodic signals such as the spectra of
rotating machinery. Power spectrum
analysis is provided for averaging
nonrepetitive signals.
Two spectrums
of road induced
vibration measured
at different speeds
are compared using
the front/back
mode of the
HP 35670A.
4
Time Domain
Use your spectrum analyzer as a lowfrequency oscilloscope or view
signals in the time and frequency
domains simultaneously. (Note: antialias filters can be switched off.)
Special markers for time-domain data
facilitate extraction of key control
system performance parameters:
overshoot, rise time, setting time, and
delay time.
Data Table
Use a tabular format to keep track
of key frequencies in the spectra of
rotating machinery. The amplitude
and frequency of the signal and a
16-character entry label field are
listed for each selected point.
Automatic Units Conversion
Display vibration data in the units
of your choice. Select g, m/sec
2
, m/s, in/s, m, mil, inch,
in/sec
Kg, lb, N, dyn, or pascals as appropri-
ate for your application. The instrument automatically converts frequency-domain data from specified
input transducer units to the units
you select for display. For example,
accelerometer data is automatically
converted and displayed as mils when
mils are selected. Of course, dB, dBV,
dBm and volts are available for
electrical applications.
2
,
Harmonic markers
are used to
calculate the THD
of a signal without
including the
effects of noise.
Measurement
results at key
frequencies can
be labeled and
listed using data
table.
Simultaneous
display of
frequency
and time domain
data facilitates
analysis of gear
mesh vibration.
Markers
Markers streamline analysis by
helping you select and display specific
data. Marker functions include marker
to peak, next right peak, and coupled
markers for selecting points in
multiple data displays. Markers
readouts are absolute or relative to
your selected reference.
Special Markers
Three special marker functions
facilitate analysis of your spectral
data. Sideband markers aid analysis
of modulation signals. Use this
function to quickly locate sidebands
in the complicated spectra of rotating
machines. A band-power marker reads
the total power in a selected band of
frequencies and a total harmonic
distortion marker lets you calculate
total harmonic distortion without
including the effects of noise.
5
Frequency Response Measurements
The HP 35670A has the flexibility
to make measurements of both
electrical networks and mechanical
devices. FFT-based network analysis
is fast enough to allow real-time
adjustments of circuit parameters
while the swept-sine option provides
exacting measurements over more
than six frequency decades, and a
130 dB dynamic range.
Source
Select the optimum stimulus for each
application—random noise, periodic
chirp, pink noise, fixed sine, burst
random, and burst chirp. For zoomed
network analysis measurements, the
source is band-translated to match
the zoom span at frequencies up to
51.2 kHz. An optional arbitrary source
lets you test your product using realworld signals. A ±10 volt dc source
offset facilitates tests of control
systems.
Impact Testing
Force and exponential windows
allow impact testing for modal and
structural analysis. Quality measurements are ensured using preview and
accept/reject during averaging. A
4 mA constant current transducer
power supply is built-in for true
portability.
Limits are used
for go/no go
testing in
production. The
response of an
accelerometer is
being checked in
this example.
Limits
Test network measurements against
preset limits. Up to 800 separate line
segments are available for setting
upper and lower limits. Limits are
also used for testing spectrum
measurements.
Four Channels (option AY6)
Test up to three devices simultaneously with a four-channel
HP 35670A. Channel one is the
common reference channel and
two, three, and four are the response
channels. Alternatively, select
channels one and three as reference
channels for two totally independent
network measurements. See
option AY6 description for more
information.
Characteristics
of a selected
resonance are
automatically
calculated from
an impact
measurement
using the frequency
and damping
marker.
6
Time Capture
Markers
A frequency and damping marker
provides the resonant frequency and
the damping ratio of single-degree-offreedom frequency response measurements.
Gain and phase margin markers
extract key frequency-domain
stability data from frequencyresponse measurements of
control systems.
Signal Injection for Control
Loops
Use one of three HP signal injection
devices for testing control loops. The
HP 35280A summing junction
provides convenient dc to 1 MHz
signal injection for most control
loops. Use the HP 35281A clip-on
transformer when it is not possible to
temporarily open the loop, or use the
HP 35282A signal injection transformer when secondary voltages are
up to 600 Vpk.
Capture transient events or time
histories for complete analysis in any
measurement mode (except sweptsine). Use either the entire timecapture record or a selected region of
interest for repetitive analysis in the
FFT, octave, order track, correlation
or histogram instrument modes.
Add an additional 4 Mbytes (option
AN2) or 8 Mbytes (option UFC) of
memory for really deep time-capture
capability.
An interval of
time-capture data
has been selected
for analysis in the
octave mode.
STARModal and STARAcoustics are
products of Structural Measurement
Systems.
CADA-PC is a product of LMS International.
Microsoft® is a U.S. registered trademark
of Microsoft Corp.
AMI PRO is a product of Lotus
Development Corp.
7
Using Measurement
Results
Computed Order Tracking
(Option 1D0)
Taking the measurement is only
half the job. Raw measurement data
must be stored, recalled, printed,
plotted, integrated with other data
for analysis, and reported. The
HP 35670A has a variety of tools to
help you finish the job.
Enhanced Data Transfer
Utilities for PCs
Standard Data Format (SDF) Utili-
ties, provided with the HP 35670A,
allow you to easily move data from the
instrument to wherever it’s needed:
• For general digital signal processing
and filtering , translate data files to
formats compatible with MATLAB
and MATRIX
for use in popular spreadsheets.
• For specific applications, use
application software that reads SDF
files directly, such as STARModal
and STARAcoustics from SMS and
CADA-PC from LMS.
•Transfer data to and from the
HP 35665A, 3566A, 3567A, 3562A,
3563A.
• Use the viewdata feature to display
data on your PC or to convert to the
HP-GL format for transfer to Microsoft’s Word for Windows or Lotus’
AMI PRO word processing software.
•Convert between HP-LIF and
MS-DOS formats.
•Read data files into a program.
, Data Set 58, or ASCII
X
Self-contained—no ratio
synthesizer or tracking
filter required
Order Maps
Order Tracking
RPM or Time Trigger
Display RPM Profile
Track Up to Five
Orders/Channel
Up to 200 Orders
Composite Power
RPM Measurements
Order tracking facilitates evaluation
of spectra from rotating machines by
displaying vibration data as a function
of orders (or harmonics) rather than
frequency. All measurement spectra
is normalized to the shaft RPM.
Now you can have order tracking
without compromising portability.
Traditional analog order tracking
techniques require external tracking
filters and ratio synthesizers. With
HP’s computed order tracking
algorithm, external hardware is gone.
Because order tracking is implemented in the software, data is more
precise and your job is easier.
Compared to traditional analog order
tracking techniques, computed order
tracking offers:
• Improved dynamic range at
high orders
• More accurate tracking of rapidly
changing shaft speeds
• Accurate RPM labeled spectra
with exact RPM trigger arm
• Wide 64:1 ratio of start to stop RPMs
Order Map
Use order maps for an overview of
vibration data versus RPM or time.
Display the amplitude profile of
individual orders and suborders using
the slice marker function. Alternatively, use trace markers to select
individual traces for display.
Documented Results
The HP 35670A supports a variety of
HP-IB, serial and parallel printers and
plotters for direct hardcopy output.
The internal 3.5 inch flexible disk
drive stores data, instrument states,
HP-GL plots and HP Instrument
BASIC programs in HP-LIF or MS-DOS
formats for future recall or use on HP
workstations or a personal computer.
Entire display screens can be
imported directly into your word
processing program by plotting
HP-GL files to your named DOS file.
HP-GL files are interpreted and
displayed directly by Microsoft’s
Word for Windows and AMI PRO
from Lotus Development Corp.
The slice marker
feature is used
to select and
display an order
or suborder from
an order map.
8
Order Tracking
Measure only the data you need.
Order tracking lets you measure the
amplitude profile of up to five orders
plus composite power simultaneously
on each channel. Up to four orders
or three orders and composite power
can be displayed simultaneously.
Order tracking
is used to
simultaneously
display up to
four orders or
a combination
of orders,
composite power
and RPM profile.
RPM Profile
Use RPM profile to monitor the
variation of RPM with time during
order tracking measurements.
Composite Power
Composite power provides the total
signal power in a selected channel as
a function of RPM.
Run-Up and Run-Down
Measurements
Run-up and run-down measurements
of any order are made using external
trigger as the phase reference.
Display the results as bode or polar
plots; both are available. Markers
allow convenient notation of important shaft speeds.
Markers are used to
annotate shaft
speeds at selected
points in a run-up
measurement.
Oscilloscopequality orbit
diagrams mean
you carry only
one instrument
onto the shop
floor.
5.32kRPM
5.021kRPM
5.711kRPM
Orbits
Obtain oscilloscope-quality orbit
measurements with your HP 35670A.
Unlike traditional FFT analyzers, the
HP 35670A equipped with computed
order tracking displays a selected
number of loops (usually one) as the
shaft RPM is varied.
5.502kRPM
9
Real-Time Octave Measurements
(Option 1D1)
Microphone Adapter and Power Supply
(Option UK4)
Real-Time Third Octave to 40 kHz
ANSI S1.11-1986 Filter Shapes
Microphone Inputs and Power
A-Weighted Overall SPL
RPM or Time-Triggered Waterfalls
Eliminate the expense and inconvenience of multiple instruments in the
field. With optional real-time octave
analysis, and the optional microphone
adapter and power supply, you have
a complete real-time octave analyzer
added to your HP35670A at a fraction
of the cost of a second instrument.
Now you can carry both your FFT
and real-time octave analyzers to the
job site in the same hand.
Real-Time 1/3-Octave to
40 kHz on One Channel
With two input channels of 1/3-octave
real-time measurements at frequencies up to 20 kHz, you get all of the
information you’ll ever need to
understand the noise performance of
your product. No misinterpreted
measurements because transient
components were missed. When the
frequency range requirement is 10
kHz or less, use four channels to
characterize spatial variations. For
those exceptional circumstances, use
1/3-octave resolution at frequencies
up to 40 kHz on a single channel.
Resolutions of 1/1- and 1/12-octave
are also available.
This waterfall
display of a
flyover test
can be analyzed
trace-by-trace or
by selecting time
slices along the
z-axis.
Overall sound pressure level and
A-weighted sound pressure level can
be displayed with the octave bands
individually, together, or not at all.
A fan-off mode lets you use the
instrument in the sound field being
measured.
ANSI S1.11-1986
All octave filters comply with filter
shape standards ANSI S1.11-1986
(Order 3, type 1-D), DIN 45651, and
IEC 225-1966. An 80-dB dynamic
range for the audio spectrum provides the performance required by
acousticians. Switchable analog Aweighting filters in the input channels
comply fully with both ANSI S1.41983 and IEC 651-1979 Type 0.
Advanced Analysis
Use waterfall displays of octave data
for an overview of device noise
versus time or RPM. Display individual frequency bands as a function
of RPM or time using the slice marker
function. Alternatively, use trace
markers to select individual traces for
display.
A pink noise source is available for
testing electro-acoustic devices.
Sound Level
Meter Measurements
Peak hold, impulse, fast, slow, and L
are all provided with optional Realtime Octave Measurements. All
measurements conform to IEC 6511979 Type 0 - Impulse.
eq
Real-time
1/3-octave
measurements
at frequencies
up to 40 kHz.
HP 35670A with
option UK4
microphone
adapter and
power supply.
10
Swept-Sine Measurements
(Option 1D2)
130-dB Dynamic Range
Logarithmic or Linear Sweeps
“Auto” Frequency Resolution
While FFT-based network analysis is
fast and accurate, swept-sine
measurements are a better choice
when the device under test has a
wide dynamic range or covers several
decades of frequency range. Use
swept-sine measurements to extend
the network measurement capabilities of the HP 35670A.
Network Analysis Over a
130-dB Range
With traditional swept-sine, the
HP 35670A is optimally configured to
measure each individual point in the
frequency response. The result is a
130 dB dynamic range. With FFTbased network analysis, all frequency
points are stimulated simultaneously
and the instrument configures itself
to measure the highest amplitude
response—thereby limiting the
dynamic range.
Characterize Nonlinear
Networks
Use the auto-level feature to hold the
input or output amplitude constant
during a sweep. This provides the
device response for a specific signal
amplitude. With FFT-based network
analysis using random noise, the
random amplitudes of the stimulus
tend to “average out” the nonlinearities and therefore does not
capture the dependency of the
response on the stimulus amplitude.
Logarithmic Sweep
Test devices over more than six
decades of frequency range using
logarithmic sweep. In this mode, the
frequency is automatically adjusted to
provide the same resolution over
each decade of frequency range. With
FFT-network analysis, resolution is
constant—not a problem when
measuring over narrow frequency
ranges.
Flexible
Make the measurement your way.
Independently select logarithmic or
linear sweep, sweep up or down,
automatic or manual sweep, and
autoresolution.
Automatic Frequency
Resolution
Use autoresolution to obtain the
fastest sweep possible without
sacrificing accuracy. With
autoresolution, the HP 35670A
automatically adjusts the frequency
step according to the device response. High rates of amplitude and
phase change are matched with small
frequency steps. Low rate-of-change
regions are quickly measured with
larger frequency steps.
Test Multiple Devices
Simultaneously
Increase throughput in production.
Swept-sine measurements up to
25.6 kHz can be made on three
devices simultaneously using sweptsine on a four-channel HP 35670A.
Channel one is the common reference
channel for these measurements.
Alternatively, channels one and
three can be designated as independent reference channels for two
totally independent swept-sine
measurements.
The stability of
a control loop
is quickly
characterized
using the gain
and phase margin
marker function.
11
HP Instrument BASIC
(Option 1C2)
Realize the advantages of using your
instrument with a computer without
sacrificing portability. HP Instrument
BASIC provides the power of a
computer inside your HP 35670A.
• Create custom interfaces for
simplified operation.
•Use the HP 35670A as a system
controller to integrate it with other
instruments and peripherals.
• Enhance functionality by creating
custom measurements.
• Increase productivity with
automated operation.
HP Instrument BASIC is a compatible
subset of the HP BASIC used in
HP 9000 series 200, 300, 400 and 700
computers.
Easy Programming
The HP Instrument BASIC program
editor supports:
• Line-by-line syntax checking
• Pre-run program verification
•Single step and debug
• Automatic line numbering
An optional PC-style 101-key key-
board facilitates program development and editing. Simple programs
can be entered or edited using the
front-panel keys. Large programs can
be developed or edited in HP 9000
Series 200, 300, and 400 computers,
or on a HP Vectra with Instrument
BASIC for Windows, HP E2200A, and
then transfered to the HP 35670A.
Over 200 HP Instrument BASIC
Commands
Program entry
and editing
Program debugging
Memory allocation
Relation operators
General math
Graphics control
Graphics plotting
Graphics axes
and labeling
Program control
Keystroke
recording
quickly creates
the core of your
HP Instrument
BASIC program.
Binary functions
Trigonometric
operations
String operations
Logical operators
HP-IB control
Mass storage
Event initiated
branching
Clock and calendar
General device I/O
Array operations
Keystroke Recording
Most program development begins
with keystroke recording. Each
keystroke is automatically saved as a
program instruction as you set up
your measurement using the front
panel. The recorded sequence can be
used as the core of a sophisticated
program or run as an automatic
sequence.
HP Instrument
BASIC can be
used to display
measurement
results in a new
format or
to create a
new operator
interface.
12
Add Two Channels
(Option AY6)
Curve Fit and Synthesis
(Option 1D3)
51.2-kHz Frequency Range On
One and Two Channels
25.6-kHz Frequency Range On
Four Channels
One or Two Reference Channels
Enhance your productivity by adding
two additional input channels to your
portable analyzer. Having four
channels often means the difference
between solving a problem in the
field and having to schedule time in
a test bay.
Monitor four signals simultaneously
or use channel one as the reference
channel for up to three simultaneous
cross-channel measurements. Two
totally independent cross-channel
measurements are made by selecting
channels one and three as independent reference channels. All channels
are sampled simultaneously.
Use triaxial measurements to simulta-
neously characterize the motion of
mechanical devices in three axes.
20 Poles/20 Zeros Curve Fitter
Frequency Response Synthesis
Pole/Zero, Pole/Residue and
Polynomial Format
Use curve fit and synthesis in the
HP 35670A to take the guesswork out
of your design process. The 20-pole
and 20-zero multiple-degree-offreedom curve fitter calculates a
mathematical model of your system
or circuit from measured frequency
response data. The model can be
expressed in pole/zero, pole/residue,
or polynomial format.
For control systems, simultaneously
measure several points in a single
loop.
Curve fit
provides an exact
mathematical
model of your
circuit or device.
Transfer the circuit model to the
synthesis function to experiment with
design modifications. Add and delete
poles and zeros, change gain factors,
time delays, or frequency scaling,
then synthesize the frequency
response from the modified model.
Design modifications are tested
without ever touching a soldering
iron.
13
Arbitrary Waveform
Source
(Option 1D4)
Add 8-Mbytes RAM
(Option UFC)
Add 4-Mbytes RAM
(Option AN2)
Frequency or Time Domain Entry
Data Edit
Store Up to Eight Arbitrary
Waveforms
Test your products using real-world
signals. Measure a signal in either the
time or frequency domain, then
output it via the arbitrary waveform
source. Use math functions and data
edit to obtain precisely the output
waveform you need. An arbitrary
waveform may be output once or
repeatedly.
Standard source types can be
optimized for specific applications.
For example, random noise can be
shaped to improve the effective
dynamic range of your measurement.
Alternatively, you can use data edit
and math functions to create an
arbitrary waveform.
Use time capture as a digital tape
recorder, then playback captured
signals through the arbitrary waveform source.
Expand the data storage and timecapture capacity of your HP 35670A.
Number of Spectra Stored Per Channel
Standard Add 4 Mbyte Add 8 Mbyte
FFT - 1 Channel
1
130 600 1000
FFT- 2 Channels 250 250 400
FFT - 4 Channels 320 100 200
1/3-Octave Spectra 44000 18800 32000
1
Time Capture
1
Conditions: Preset with instrument mode switched
to 1 channel.
2
Conditions: Preset
3
Conditions: Preset with instrument mode switched
to 4 channels.
4
Conditions: Preset with instrument mode switched
to octave.
550 KSamples 2.6 MSamples 4.7 MSamples
Add 1-Mbyte Nonvolatile
RAM
(Option UFF)
Use the 1-Mbyte nonvolatile RAM in
environments too harsh for the 3.5
inch flexible disk drive. The memory
functions as a high-speed disk for
storage of the following information.
• Instrument Setup States
• Trace Data
• User Math Definitions
• Limit Data
• Time Capture Buffers
• HP Instrument BASIC Programs
• Waterfall Display Data
• Curve Fit/Synthesis Tables
• Data Tables
Math functions are
used to optimize a
burst chirp signal
for a frequency
response
measurement.
Information stored in nonvolatile
RAM is retained when the power is
off.
14
HP 35670A Ordering Information
HP 35670A
Dynamic Signal Analyzer
Standard Configuration:
• 1.4 Mbyte, 3.5-in. flexible disk drive
• 1.5 Mbytes user RAM
• Impact Cover
• Standard Data Format Utilities
• AC Power Cord
• Operating manual set including:
Operator’s Guide
Quick Start Guide
Installation and Verification Guide
HP-IB Programming with the
HP35670A
HP-IB Commands:Quick Reference
HP-IB Programmer’s Guide
• Standard one-year warranty
Options for the HP 35670A
Opt. Description
AY6 Add Two Channels (four total)
1D0 Computed Order Tracking
1D1 Real-Time Octave
Measurements
UK4 Microphone Adapter and Power
Supply
1D2 Swept-Sine Measurements
1D3 Curve Fit and Synthesis
1D4 Arbitrary Waveform Source
1C2 HP Instrument BASIC
AN2 Add 4-Mbytes Memory
UFC Add 8-Mbytes Memory
Note: Only one of option AN2 or
UFC may be installed
UFF Add 1-Mbyte Nonvolatile RAM
1F0 PC-style Keyboard
1F1 German Keyboard
1F2 Spanish Keyboard
1F3 French Keyboard
1F4 UK Keyboards
1F5 Italian Keyboard
1F6 Swedish Keyboard
AX4 Rack Mount Without Handles
100 Software Bundle 1D0-1D4, UFC
UK5 Carrying Case (for shipping)
0B1 Additional Manual Set
0BU Additional HP Instrument
BASIC Manual Set
0B3 Add Service Manual
1BP Military Calibration (meets MIL
45662A)
W30 Two Year Extended Service
Contract
To Upgrade Your HP 35670A
To add an option to your HP 35670A,
order HP 35670U followed by the
option number. Options AY6, AN2,
UFC and UFF must be installed by
Hewlett Packard. Option UE2 is
available to upgrade instrument
firmware to latest version, as
appropriate.
Accessories
DC Power Cables
The HP 35250A is a three meter cable
terminated with lugs for connecting
to most dc power sources. The
HP 35251A is a three meter cable
terminated with an adaptor that plugs
into a cigarette lighter.
For Testing Control Systems
The HP 35280A summing junction
provides convenient dc to 1 MHz
signal injection for most control
loops. Use the HP 35281A clip-on
transformer when it is not possible to
temporarily open the loop, or use the
HP 35282A signal injection transformer when secondary voltages are
up to 600 Vpk.
Physical Sensors
For a complete list of accessories
for this and other HP Dynamic Signal
Analyzers, please refer to the
HP DSA Accessory Catalog
(publication number 5091-9708E).
15
Summary of Features on Standard Instrument
The following features are standard
with the HP 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:
C
alculated Value:
(ESD)
Unit Format:
dB reference, dBm with user selectable
impedance.
Y-Axis Phase:
X-Axis:
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
MS-DOS® is a U.S. registered trademark of Microsoft Corporation.
MATRIX X is a product of Integrated Systems Inc.
Matlab is a product of The Math Works.
rms, peak, peak-to-peak
V, V2, V2/Hz, V/√—Hz, V2s/Hz
linear, dB’s with user selectable
degrees, radians
hz, cpm, order, seconds, user-defined
Signal Averaging (FFT Mode)
Average Types (1 to 9,999,999 avgerages)
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
HP-IB Trigger
Armed Triggers
Automatic/Manual
RPM Step
Time Step
Pre- and Post-Trigger Measurement Delay
Tachometer Input:
±4 V or ±20 V 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
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
LN EXP
∗jω or /jω PSD
Differentiation A, B, and C weighting
Integration Constants K1thru K5
Overload Indicators
-1
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 HP-IB. 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 HP 35670A
provides storage and recall from the internal
disk, internal RAM disk, internal NVRAM disk, or
external HP-IB disk for any of the following
information:
Instrument Setup States Trace Data
User-Math Limit Data
Time Capture Buffers HP Instrument BASIC
Waterfall Display Data Programs
Data Tables Curve Fit/Synthesis
Interfaces
HP-IB (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
HP-IB Capabilities
Listener/Talker (Direct control of plotters,
printers, disk drives)
Conforms to IEEE 488.1/488.2
Conforms to SCPI 1992
Controller with HP Instrument Basic option
Standard Data Format (SDF) Utilities
Exchange data between virtually all
HP Dynamic Signal Analyzers
Easy data transfer to spreadsheets
Data transfer to MATRIXX and 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
Data subject to change.
Copyright © 1994, 1997 Hewlett-Packard Co.
Printed in U.S.A. 12/97
5966-3063E
Tables
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