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Agilent Technologies 35670A User Manual

Agilent Technologies 35670A
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To measure a step response
The primary objective in designing a control system is to construct a system that
achieves the desired output level as fast as possible and maintains that output with
little or no variation or steady state error. The step response is a technique that
measures a control system’s compliance with the design goals. This task utilizes a
step signal created with the Arbitrary Source, Option 1D4.
1 Create and store a step signal in data register D1.
See “To create a step signal” in chapter 6.
2 Initialize the analyzer.
Press [
Preset
][
DO PRESET
].
Press [
Inst Mode
][
HISTOGRAM/TIME
].
Press [
Meas Data
].
Press [
CHANNEL 1 2 3 4
] to highlight 2.
Press [
UNFILTERD TIME CH2
].
3 Connect the device-under-test (DUT) as shown in the illustration below.
4 Specify the measurement parameters.
Press [
Freq
][
RECORD TIME
] <number> <unit>.
Press [
Input
][
CH1 FIXED RANGE
] <number> <unit>.
Press [
Source
][
MORE CHOICES
][
ARBITRARY (D1 - D8)
].
Press [
Rtn
].
Press [
LEVEL
] <number> <unit>.
Press [
SOURCE ON OFF
] to highlight ON.
Agilent 35670A
Measuring Control Systems Operator's Guide
5-8

Table of Contents

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Agilent Technologies 35670A Specifications

General IconGeneral
BrandAgilent Technologies
Model35670A
CategoryMeasuring Instruments
LanguageEnglish

Summary

Safety Summary

GROUND THE INSTRUMENT

Connect instrument chassis and cover to electrical protective earth ground to minimize shock hazard.

FUSES

Use only specified rated fuses; do not use repaired fuses or short-circuited holders.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Avoid operating the instrument in the presence of flammable gases or fumes.

DO NOT REMOVE THE INSTRUMENT COVER

Operating personnel must not remove covers; internal adjustments by qualified personnel only.

1 Measuring Rotating Machinery

To connect transducers

Connect transducer output cables to analyzer input channels.

To calibrate a transducer

Use a calibrator to set transducer sensitivity and match display units.

To measure an order spectrum

Measure order spectra using calibrated transducers in order analysis mode.

To measure an order track

Measure order tracks using calibrated transducers in order analysis mode.

2 Measuring Structures

Setting Up Your Test

Basic test setup for frequency response measurements, considering fixturing and excitation.

Interpreting Measurement Results

Trial measurements and signal analysis for accurate results, including input ranging.

Improving Accuracy

Techniques like averaging and windowing to improve measurement accuracy.

3 Measuring Sound

To connect the microphone adapter (Option UK4)

Connect the microphone adapter and power supply (Option UK4) to the analyzer.

To calibrate a microphone

Enter calibration factor for accurate acoustic signal measurement.

To measure sound pressure level

Measure sound pressure level (SPL) using octave analysis mode.

4 Measuring Spectra and Networks

To measure a wideband spectrum

Survey frequencies to locate signal components for closer examination.

To measure a narrowband spectrum

Examine signal components more closely by narrowing the frequency span.

To measure frequency and amplitude

Read frequency and amplitude from a marker on a signal component.

To measure harmonic distortion

Calculate total harmonic distortion (THD) by marking the fundamental frequency.

5 Measuring Control Systems

Measuring Control System Performance

Derive performance measures like rise time, overshoot, and settling time from step response.

To measure a step response

Measure system compliance with design goals using a step signal.

Measuring Control System Stability

Measure loop stability by finding open loop frequency response function.

6 The Arbitrary Source Option 1D4

The Arbitrary Source

Supply various waveforms and flexibility for accurate characterizations using arbitrary source.

To create a step signal

Build a step source signal for control loop performance characterization.

To create a ramp signal

Build a ramp waveform using the analyzer's math capability.

7 Using Time Capture

To prepare for filling the capture buffer

Complete connections and specify parameters, setting manual ranges for input channels.

To allocate memory for the capture buffer

Set measurement parameters and allocate buffer length for desired time data capture.

To fill the capture buffer

Collect data from active input channels and place it in the time-capture buffer.

8 Displaying Measurement Data

To select the active trace

Activate trace buffers (A, B, C, D) to modify them individually or in groups.

To display measurement data—one channel, one trace

Display measurement data for one channel on a single trace.

To display a math function

Display results of a math operation defined using operands and operators.

9 Formatting the Display

To arrange traces on the screen

Configure screen layout for single, two, or four traces.

To set up a waterfall display

Specify measurements for waterfall buffer and set Z-axis range.

To enhance a waterfall display

Adjust waterfall skew, suppress baseline noise, and change trace height.

To enable trace-specific screen elements

Enable trace grid, overall SPL band, and marker readout.

10 Scaling the Display

To enable Y-axis autoscaling

Automatically rescale Y-axis each time a trace is updated for optimal display.

To scale the Y-axis with Reference and Y Per Div softkeys

Adjust display top, center, or bottom reference and Y Per Div.

To scale the X-axis with axes scale markers

Enlarge a portion of the display for closer examination using X-axis scale markers.

To match Y-axis scaling of another trace

Set Y-axis scaling of active traces to match another trace's scaling.

11 Selecting Display Units

To select a coordinate system

Choose coordinate system (magnitude, phase, real/imaginary) for X- and Y-axes.

To select the frequency/time unit

Select units for frequency (Hz, CPM, Order) or time (sec).

To select the phase unit

Select phase units in degrees or radians.

To specify a transducer’s unit and sensitivity

Enter transducer unit and sensitivity for accurate measurements.

12 Using Online Help

To display help for a key

Enter online help system and press any hardkey or softkey to get context-sensitive help.

To display a related help topic

Navigate through linked topics using the knob and number keys.

To select a topic from the help index

Access an alphabetical listing of help topics via the numeric keypad index.

To print a help topic

Print the analyzer's online help topic text to a printer.

13 Managing Files and Disks

To select the default disk

Choose the default disk for saving and recalling files (NVRAM, RAM, Internal, External).

To format a flexible disk

Format a 3.5-inch flexible disk for storing analyzer data.

To save a trace

Save active traces to a data register or to a file on disk.

To recall a trace

Recall a trace file into a data register for display.

14 Plotting and Printing

To set up your hardcopy device—parallel

Connect and configure the analyzer for parallel port operation with plotters/printers.

To set up your hardcopy device—serial

Connect and configure the analyzer for serial port operation.

To plot screen contents

Create a plot file on disk by selecting screen parts to plot.

To print screen contents

Print screen contents, excluding softkey labels, to a printer.

15 Synthesis Option 1D3

Synthesis

Generate frequency-response traces based on an H(s) model for theoretical circuit analysis.

The Synthesis Model

Enter transfer function parameters into a synthesis table to create frequency response traces.

To create a synthesis table

Enter poles, zeros, and optionally gain, delay, and frequency scale.

Performing the Synthesis

Perform synthesis after entering data, affecting frequency span and X-axis spacing.

16 Curve Fit Option 1D3

Curve Fit

Find a mathematical model to approximate frequency response from measurement or synthesis.

Curve Fit Operating Modes

Two modes: Fixed Order (user-specified) and Max Order (automated search).

To perform a curve fit

Setup curve fit, start fit, overlay results, and view curve fit table.

Working with Curve Fit Tables

Compare synthesized results to original measurement and save/recall tables.

17 Limit Testing

To draw a limit

Create a single-segment or multi-segment limit line on the active trace.

To enable limit testing

Evaluate trace against upper/lower limit registers, with options for display and beeping.

To save a limit

Save upper or lower limit registers to a file for reuse.

18 Math Operations and Data Editing

Math Operations

Perform operations on traces using constants, functions, and operators.

Editing Data Registers

Change trace data in a register by defining line segments.

To define a constant

Define real or complex constants (K1-K5) for use in math functions.

To define a function

Define math functions by specifying operands and operators in algebraic notation.

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