Agilent 0A Quick Start Guide Datasheet

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Page 1

Agilent 35670A Quick Start Guide

Agilent Part Number 35670-90056 Printed in U.S.A.

Page 2

The Agilent 35670A at a Glance (Front Panel)

Page 3

Agilent 35670A Front Panel

1-Use the softkeys to select items from the current

menu. A softkey’s function is indicated by a video label on the analyzer’s screen. Throughout this book, softkeys are printed like this: [

FFT ANALYSIS

Hardkeys are front-panel buttons whose functions are always the same. They have a label printed directly on the key itself. Throughout this book, hardkeys are printed like this: [

Inst Mode

2-The analyzer’s screen is divided into the menu

area and the display area. The menu area displays video labels for the softkeys. The data area displays measurement data and information about the parameter settings.

3-The [

level.

] key returns the menu to the previous

Rtn

4-The POWER switch turns on the analyzer.

5-Use the SYSTEM keys to control various

system-level functions. These functions include saving files, plotting measurement data, and accessing online help.

6-Use the disk drive to save your work on 3.5

inch flexible disks.

7-The knob moves the markers and the cursor. It

also steps through numeric values and scrolls through online help.

10-Use the MEASUREMENT keys to control the

analyzer’s source and inputs. They also control measurement parameters. You must make a new

measurement if you change a MEASUREMENT parameter.

11-Use the numeric-entry keys to enter a numeric

value.

12-The microphone power connector provides

power (8 Vdc) for the Microphone Adapter Kit (Option UK4).

13-The connector area of the front panel has two

different configurations. The standard analyzer has a source output connector and two input connectors. The 4-channel analyzer (Option AY6) has four input connectors.

Range indicators are located next to each input connector. The upper LED is the over-range indicator (the signal level exceeds the current range setting). The lower LED is the half range indicator (the signal level exceeds half the current range setting).

14-A source on/off indicator is located at the left

edge of the connector area.

The standard Agilent 35670A (2-channel) has a source connector on the front panel.

8-Use the DISPLAY keys to control what

appears on the analyzer’s traces. They only affect how data is displayed; DISPLAY keys do not change measurement parameters. You can press

keys in the DISPLAY menus without losing measurement parameters.

9-Use the MARKER keys to select a variety of

marker features.

Page 4

The Agilent 35670A at a Glance (Rear Panel)

Page 5

Agilent 35670A Rear Panel

1-The GPIB connector links the Agilent 35670A

to other GPIB devices. GPIB parameters are set in the [

Local/GPIB

] and [

Plot/Print

] menus.

2-The SERIAL PORT and the PARALLEL

PORT link the analyzer to plotters and printers. These parameters are set in the [

Plot/Print

] menu.

3-The SOURCE connector outputs the analyzer’s

source signal. An LED on the front panel indicates if the source is on or off. The source parameters are set in the [

The standard Agilent 35670A (2-channel) also has a source connector on the front panel.

Source

] menu.

4-The EXT TRIG connector links the analyzer to

an external trigger signal. The external trigger parameters are set in the [

Trigger

] menu.

5-The TACH connector links the analyzer to a

tachometer. The tachometer parameters are set in the [

Input

] menu.

6-The KEYBOARD connector attaches an

optional keyboard to the analyzer.

7-The DC POWER connector accepts DC power

levels from 12 - 28 Vdc (nominal).

8-The AC POWER connector accept a wide range

of ac voltage levels.

9-The POWER SELECT switch determines

whether the analyzer is powered via the AC POWER connector or the DC POWER connector.

10-The EXT MONITOR port links the analyzer

to multi-sync monitors.

Page 6

Saftey Summary

The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies, Inc. assumes no liability for the customer’s failure to comply with these requirements.

GENERAL

This product is a Safety Class 1 instrument (provided with a protective earth terminal). The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions.

All Light Emitting Diodes (LEDs) used in this product are Class 1 LEDs as per IEC 60825-1.

ENVIRONMENTAL CONDITIONS

This instrument is intended for indoor use in an installation category II, pollution degree 2 environment. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety precautions are taken. Note the instrument’s external markings described under Safety Symbols.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cover must be connected to an electrical protective earth ground. The instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

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FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not use repaired fuses or short-circuited fuse holders. To do so could cause a shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes.

DO NOT REMOVE THE INSTRUMENT COVER

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made only by qualified service personnel.

Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,

practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

Caution The CAUTION sign denotes a hazard. It calls attention to an operating

procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

Page 8

Safety Symbols

Warning, risk of electric shock

Caution, refer to accompanying documents

Alternating current

Both direct and alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

Terminal is at earth potential.

Standby (supply). Units with this symbol are not completely disconnected from ac mains when

this switch is off

Page 9

Table of Contents

The Basics 1

To turn on the analyzer — AC power 2

To turn on the analyzer — DC Power 3

Todisplayhelpforakey 4

To preset the analyzer 5

To activate the input channels 6

To activate the input channels—Option AY6 7

To select an instrument mode 8

To type a text string 9

To change a numeric parameter 10

To move the main marker 11

To measure a value relative to a reference 12

Setting Up 13

To set the analyzer’s GPIB address 14

To set the analyzer’sclock 15

To select the default disk 16

Working with the Display 17

To select the active trace 18

To display traces 19

To select measurement data 20

To scale measurement data 22

To display the measurement state 23

To change parameters using the measurement state 24

To display a waterfall 25

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Making Measurements 27

To measure a spectrum 28

To measure frequency response — FFT 30

To measure frequency response — Swept Sine (Option 1D2) 32

To calibrate a microphone — Octave Analysis (Option 1D1) 34

To measure sound pressure level — Octave Analysis

(Option 1D1) 36

To measure harmonic distortion 38

To characterize a tach pulse 40

To specify tachometer holdoff time 42

To measure an order spectrum 44

Saving and Plotting Data 47

To format a flexible disk 48

Tosaveatracetoafile 49

To recall a trace from a file 50

Tosaveatracetoadataregister 51

To setup your plotter — GPIB 52

To setup your plotter — Serial 53

To plot screen contents 54

Automating Measurements 55

To select the active Instrument BASIC program 56

To record a measurement sequence 57

To execute a recorded measurement sequence 58

To customize your analyzer 59

To save an Instrument BASIC program to disk 60

Index

Guide to 35670A Documentation

Need Assistance?

About this Edition

Page 11

The Basics

Page 12

Page 13

The Basics

Even if you decide to skip the rest of this book, be sure to read through and perform the tasks in this section. Understanding these tasks is very important if you want to get the most from your Agilent 35670A.

Page 14

The Basics Agilent 35670A Quick Start Guide

To turn on the analyzer — AC power

Depress the power select switch on the rear panel to select “AC” power.

1 2 Connect the power cord to the analyzer. 3 Depress the power switch.

The power switch is located in the lower-left corner of the front panel.

Power Switch

Power Select Switch

Page 15

Agilent 35670A Quick Start Guide The Basics

To turn on the analyzer — DC Power

Depress and release the power select switch on the rear panel.

1 2 Connect the DC source to the analyzer. 3 Depress the power switch.

If the analyzer is running on AC power, you can switch to DC power, without turning off the analyzer. It is important to remember to connect the DC source before releasing the power select switch on the rear panel.

If you need to ground the DC source, a ground terminal is located on the rear panel.

DC Source

Power Switch

Power Select Switch

Page 16

The Basics Agilent 35670A Quick Start Guide

Todisplayhelpforakey

Title shows you which topic is displayed

Press [

HELP

2 Press any hardkey or softkey. 3 Press the down-arrow or up-arrow hardkey to page.

or Turn the knob to scroll.

4 Repeat steps 2 and 3 for each key you want help on. 5 Press [

The first time you press , take a few minutes to read the help overview. It is only four pages long, and it includes descriptions of advanced help features—like the index and cross-reference “links”—that can help you locate the information you need quickly.

When you quit help, the analyzer restores the menu that was displayed before you activated help.

] to quit online help.

HELP

Scroll bar indicates how much of the topic is displayed

Legend shows you which help functions are assigned to the numeric keypad

Page 17

Agilent 35670A Quick Start Guide The Basics

To preset the analyzer

Press [

1 2 Press [

Preset

DO PRESET

You can preset the analyzer to return it to a known state. This known state provides a convenient starting point when you are setting up a new measurement.

The following illustration lists the states of important parameters after you preset the analyzer. You can display this listing on your analyzer by pressing [ [

MEASURMNT STATE

].) For more information on the analyzer’s preset state, use

Disp Format

online help. To define your own preset state, see “To customize your analyzer,” in the Automating Measurements section.

Measurement State after pressing [Preset] [Do Preset]

]

Page 18

The Basics Agilent 35670A Quick Start Guide

To activate the input channels

Press [

1 2 Press [

This selection must be made before the measurement is started. If you change the number of input channels, you must restart the measurement. At preset, the analyzer is set to measure with two channels.

Channel 1 is the reference channel for measurement results that require data for two channels.

Inst Mode

CHANNELS 1 2

] to highlight1for a one channel measurement.

Overload Indicator

Channel 2

Half Range Indicator

Channel 1

Page 19

Agilent 35670A Quick Start Guide The Basics

To activate the input channels—Option AY6

Press [

1 2 Press [

Inst Mode

CHANNELS 1 2 4

highlight

3 If you want to make Channel 3 the reference channel to Channel 4, press [

] to highlight

1,3

] to highlight4for a four channel measurement. Press it again to

for a single channel measurement.

1,3

REF CHANS 1

Channel 1 is the default reference channel. If you want to use channel pairs, set Channel 3 as the reference to Channel 4. Channel 1 remains the reference to Channel 2.

Option AY6

Overload Indicator

Half Range Indicator

Page 20

The Basics Agilent 35670A Quick Start Guide

To select an instrument mode

Press [

Inst Mode

2 Press [

FFT ANALYSIS

]. or Press [

OCTAVE ANALYSIS

] to select Realtime Octave Measurements (Option 1D1 only). or Press [

ORDER ANALYSIS

] to select Computed Order Tracking (Option 1D0 only). or Press [

SWEPT SINE

] to select Swept Sine Measurements (Option 1D2 only). or Press [

CORRELATN ANLYSIS

]. or Press [

HISTOGRAM/TIME

] to select histograms and time domain.

The analyzer can make measurements that fall into six broad categories, some available as special options. These categories are called instrument modes.

You should select an instrument mode before specifying other measurement parameters. Instrument modes are not coupled. Parameters set in one instrument mode are independent of parameters set in the other modes.

For more information on the six instrument modes, use online help.

Page 21

Agilent 35670A Quick Start Guide The Basics

To type a text string

Plug in the optional keyboard.

1 2 Press a softkey that displays a text prompt box. (For example, press [

[

SAVE DATA

3 Type the text. All characters—alpha, numeric and special—are enabled. 4 Use the [ 5 Press [

You do not need the optional keyboard to enter a text string. The analyzer enters alpha-entry mode when you press a softkey that displays a text prompt. While the analyzer is in this mode

• Most front-panel hardkeys are remapped as alpha characters.

• The numeric keypad is active.

• The alpha-entry menu gives you access to special characters and other typing

functions.

For more information on alpha-entry mode, use online help. (Alph-entry mode can be accessed through the online help index.)

Each remapped hardkey inserts the character adjacent to its lower-right corner

], [

SAVE TRACE

BACK SPACE

] to accept the string you typed.

ENTER

This text prompt is displayed when you press [SAVE TRACE]

], [

INTO FILE

] key or cursor keys one or more times if you make a mistake.

].)

Save/Recall

[UPPERCASE lowercase] works like CAPS LOCK on a keyboard

[Back Space] backs up over mistakes

Numeric hardkeys insert numbers

MORECHARS softkeys insert special characters

Page 22

The Basics Agilent 35670A Quick Start Guide

To change a numeric parameter

Press a softkey that displays a numeric-entry prompt box (for example [

] menu.

[

Freq

SPAN

]inthe

2 Press one of the arrow hardkeys.

or Type a value with the optional keyboard. or Turn the knob before the prompt box disappears. or Type a value with the numeric keypad.

3 If you typed a number, press a unit softkey or [

If you are using an optional keyboard, press the corresponding function key.

When you press a softkey that controls a numeric parameter, the analyzer activates the key (indicated by highlighting the softkey) and displays a numeric-entry prompt box. The prompt box is removed after a short time if you do not change the value, but the softkey remains active. An active softkey is always ready to accept entry from the arrow keys or numeric keypad, even when the prompt box is not displayed.

The arrow hardkeys and the knob change a numeric parameter by stepping it through successive values. In some cases, you can specify the size of the step. The knob is more convenient if you need to step a parameter quickly through many successive values, but the prompt box must be displayed before you start turning the knob.

] to complete the entry .

ENTER

This numeric-entry prompt is displayed when you press [Freq] [Span]

Increase a value by turning the knob clockwise or pressing the up-arrow hardkey

Decrease a value by turning the knob counter-clockwise or press the down-arrow hardkey

[Back Space] backs up over mistakes

Highlighting (also called inverse video) shows that [SPAN] is the active softkey

Page 23

Agilent 35670A Quick Start Guide The Basics

To move the main marker

Marker readout area

Press [

Marker

2 Turn the knob.

You can easily determine the X- and Y-axis values of any point on a trace. Just move the main marker to the point of interest and read its value from the marker readout. The main marker appears as a small diamond.

You do not always need to press [

Marker

habit to develop. The knob has two primary functions outside of text entry: moving the main marker and changing the value of numeric parameters. When you press

[

Marker

], you ensure that the knob is assigned to moving the marker.

In addition to using the knob, you can move the main marker by pressing the arrow keys or entering an X-axis position. In both cases, you must press [ can also press one of the marker search softkeys. For more information on moving markers,seeonlinehelpforthesoftkeysinthe[

] before you turn the knob, but it is a good

] first. You

Marker

] menu.

Main Marker

Page 24

The Basics Agilent 35670A Quick Start Guide

To measure a value relative to a reference

Relative Marker readout area

To stop a measurement, press [

1 2 Press [

Marker

], [

REFERENCE SETUP

Pause-Cont

3 Using the knob, move the main marker to the reference position. 4 Press [

REFERENCE TO MARKER

5 Using the knob, move the relative marker to the point of interest. 6 Read the Xr and Yr values which are relative to the main marker’s reference position.

The [

REFERENCE TO MARKER

main marker’s current marker position. The marker reference appears as a small square. The marker readouts, Xr and Yr at the top of the grid, are relative to this position.

The relative marker let you easily determine the peak-to-peak value of a spectrum. It can also be used to measure the holdoff time for a tachometer signal.

] key turns on the relative marker and zeroes it at the

Marker Reference values

Marker Reference

Relative Marker

Page 25

Setting Up

Page 26

Page 27

Agilent 35670A Quick Start Guide Setting Up

Setting Up

This section shows you how to initialize some important settings that you will rarely need to change. The settings are stored in the analyzer’s battery-backed memory so they are not lost when you turn off the analyzer or when you press [

][

Preset

This section does not show you how to install your analyzer. If you have just unpacked your analyzer, refer to your Agilent35670A Installation and Verification Guide..

DO PRESET

Page 28

Setting Up Agilent 35670A Quick Start Guide

To set the analyzer’sGPIBaddress

Press [

Local/GPIB

2 Verify the analyzer’s GPIB address at the top of the display. 3 To change the address, press [

You can create an GPIB system by connecting your analyzer to other devices with GPIB cables. For example, you create a simple GPIB system when you connect the analyzer to an GPIB plotter. To make the system function properly, you must assign a unique address to each attached device—even the analyzer.

The analyzer’s address is set to 11 at the factory. Valid values include all integers from 0 through 30.

Current GPIB Address Settings

ANALYZER ADDRESS

]<number>[

ENTER

Page 29

Agilent 35670A Quick Start Guide Setting Up

To set the analyzer’sclock

Time and date are included in top-left corner when you plot or print with [TIME STMP ON] in [Plot/Print] [MORE SETUP] menus

Press [

1 2 Press [ 3 Press [

System Utility

TIME HHMM

DATE MMDDYY

] [

CLOCK SETUP

] <time> [

]<date>[

ENTER

You can set the analyzer’s battery-backed clock to match the current time and date. After you set the clock, it maintains the time and date—even when the analyzer is turned off.

Enter <time> and <date> using the numeric keypad. Use a 24-hour format for <time> and a month-day-year format for <date>.

The time stamp determines how the analyzer displays the date and time. To change the format of the time stamp, press [ [

TIME STAMP SETUP

]. The analyzer provides several formats. See online help for

System Utility

] [

CLOCK SETUP

]

more information.

Page 30

Setting Up Agilent 35670A Quick Start Guide

To select the default disk

Press [

Disk Utility

] [

DEFAULT DISK

or Press [

2 Press [

Save/Recall

NON-VOL RAM DISK

] [

DEFAULT DISK

]

or Press [

VOLATILE RAM DISK

] or Press [

INTERNAL DISK

] or Press [

EXTERNAL DISK

Your default disk selection tells the analyzer which disk to use when it is saving and recalling files. You can use online help to learn more about these options, but here is an overview:

• [

NON-VOL RAM DISK

] selects the analyzer’s battery-backed RAM disk. There is approximately 100 Kbytes of storage space for data. (Option UFF adds an additional 1 Mbytes of non-volatile RAM.) The data is not lost when you turn off the analyzer.

• [

VOLATILE RAM DISK

] selects the analyzer’s volatile RAM disk. Data is lost when you turn off the analyzer. However, you can format the disk to hold more data than the non-volatile RAM disk, and file operations are much faster than on the internal disk.

• [

INTERNAL DISK

] selects the analyzer’s internal disk drive. The internal disk uses

3.5-inch flexible disks (double-sided, double- or high-density). For more information, see “To format a flexible disk” later in this book.

• [

EXTERNAL DISK

number with the [ drive in the [ must be set as the [

] selects an external GPIB disk. (You must specify a disk unit

EXTERNAL DISK UNIT

Local/GPIB

] menu with the [

SYSTEM CONTROLLER

] softkey.) Enter the address of the disk

DISK ADDRESS

] softkey. The analyzer

]. For more information on setting

addresses, see online help.

Page 31

WorkingwiththeDisplay

Page 32

Page 33

WorkingwiththeDisplay

This section shows you how to control important display options. It will be easier for you to analyze data if you know how to control these options.

Page 34

Working with the Display Agilent 35670A Quick Start Guide

To select the active trace

Press [

Active Trace

2 Press one of the following softkeys:

[

]

[

]

[

]

[

]

[

ABCD

The analyzer has four trace buffers that are independent of the input channels: trace A, trace B, trace C, and trace D. In addition to the individual traces, the following traces can be active at the same time:

• A and B—trace A is the “most active” trace.

• C and D—trace C is the “most active” trace.

• ABCD—trace A is the “most active” trace.

Trace pairs AC and BD cannot be active at the same time.

The “most active” trace data is saved during a save operation and menu selections show the “most active” trace setup.

You have many options for selecting and displaying the contents of a trace, but you must activate the trace before you can change these options. For example, most of the selections under the [

Marker

] and [

Display

] menus only affect the active trace.

Inverse video indicates which traces are active

Page 35

Agilent 35670A Quick Start Guide Working with the Display

To display traces

Press [

1 2 Press [

Disp Format

SINGLE

]. or press [

SINGLE FRNT/BACK

]. or press [

UPPER/LOWER

]. or press [

UPPER/BIG LOWER

press [

UPPR/LOWR FRNT/BACK

QUAD

press [

When you display multiple traces, any number of them can be active. The analyzer uses inverse video to show you which traces are active.

If you select the front/back formats (press [ [

UPPR/LOWR FRNT/BACK

]), the “back” trace is ghosted (displayed with half-bright

SINGLE FRNT/BACK

]or

characters).

The analyzer allows only one active trace if you select the single-trace display format. The analyzer selects the “most active” trace. See the previous task if you do not understand what it means to activate a trace.

Upper/lower trace format

Back trace appears ghosted

Single Front/Back format

Page 36

Working with the Display Agilent 35670A Quick Start Guide

To select measurement data

Select the active traces. (See “To select the active trace,” the first task in this section.)

1 2 Press [ 3 Press [

Meas Data

CHANNEL 1 2

or Press [

CHANNEL 1 2 3 4

selections as you press [

4 Press one of the measurement data softkeys. The [

another menu of measurement data selections.

If measurement data is not available, its softkey label is ghosted (displayed using half-bright characters). The availability of trace data is limited by:

• your selection of instrument mode (See “To select an instrument mode” in the first

section.)

• the number of active channels

]

] (option AY6). The analyzer steps through the channel

CHANNEL 1 2 3 4

MORE CHOICES

] softkey displays

Page 37

Agilent 35670A Quick Start Guide Working with the Display

When the analyzer has two active input channels and multiple active traces, selecting measurement data while the [

• Channel 1 measurement data to Trace A.

• Channel 2 measurement data to Trace B.

• Channel 1 measurement data to Trace C.

• Channel 2 measurement data to Trace D.

ALL CHANNELS

] softkey is highlighted, sets:

When the analyzer has four active input channels (Option AY6) and four active traces, selecting measurement data while the [

• Channel 1 to Trace A.

• Channel 2 to Trace B.

• Channel 3 to Trace C.

• Channel 4 to Trace D.

ALL CHANNELS

] softkey is highlighted, sets:

Page 38

Working with the Display Agilent 35670A Quick Start Guide

To scale measurement data

Select the active trace(s) you want to scale. (See “To select the active trace,” the first

task in this section.)

2 For continuous autoscaling, press [

or For single autoscaling, press [ press [

Autoscaling provides a convenient starting point when you are scaling measurement data. It displays all of the data within the bounds of the active trace box. From this starting point, you can easily reposition and expand the trace by modifying the values of other scaling softkeys.

• Use [

reference value you specify. You can also anchor the reference to the top of the trace box ([ ([

• Use [

enter a value that defines the height of each vertical division.

• Use [

the input channel supplying the measurement data.

To learn more about the scaling softkeys, use online help.

Matches Scale Menu scales the active trace to any other trace

AUTOSCALE ON OFF

CENTER REFERENCE

TOP REFERENCE

BOTTOM REFERENCE

YPERDIV

INP RANGE TRACKING

] to expand or compress the trace in relation to the Y-axis. You

Scale

] [

Scale

] [

AUTOSCALE ON OFF

] to highlight ON.

] to highlight ON, then

] to highlight OFF.

] to expand or compress a trace around the center

]) or to the bottom of the trace box

]).

] to expand or compress a trace in relation to the level of

Y Per Dir defines the increment between Y-axis divisions

Page 39

Agilent 35670A Quick Start Guide Working with the Display

To display the measurement state

•

Press [

Disp Format

The measurement state is a list that summarizes the current states of important measurement parameters. There are several ways you can use the list. You can:

• quickly check the current setup

• document the setup (The list can be printed or plotted.)

• change the parameters while viewing the setup (See the next task, “To change

parameters using the measurement state.”)

When you learn to switch between the analyzer’s instrument modes, you will notice that the contents of the list are different for each mode. This reflects the fact that some parameters are not used for a particular instrument mode.

] [

MEASURMNT STATE

Swept Sine instrument mode (option 1D2)

Realtime Octave analysis instrumnet mode (option 1D1)

Computed Order analysis intrument mode (option 1D0)

Page 40

Working with the Display Agilent 35670A Quick Start Guide

To change parameters using the measurement state

To stop a measurement, press [

1 2 Press [

Disp Format

] [

MEASURMNT STATE

Pause-Cont

3 Using the knob, move the cursor to the field you wish to change. 4 Use the up-arrow or down-arrow keys to step through the available values for that

field. or Press <number> <unit>.

5 Press [ 6 Press [

Pause-Cont

Disp Format

As you select parameter values, the analyzer may change other parameters to their default value. It is best to start at the top of the list and work your way down.

Pausing the measurement while you change the measurement state, allows the process to go faster.

] and the appropriate trace-display format softkey.

Turn the knob to select the field

Use the arrow keys to step through values

Page 41

Agilent 35670A Quick Start Guide Working with the Display

Todisplayawaterfall

Press [

1 2 Press [ 3 Press [ 4 Press [ 5 Press [

The traces scroll down the trace box. The newest trace is at the top. The [

Z AXIS RANGE

waterfall. The range varies with the type of data you are displaying.

The waterfall diplay format is not available for swept sine measurements. For more information, see the Agilent 35670A Operator’s Guide and online help.

] [

Scale

Disp Format

WATERFALL ON OFF

SKEW ON OFF

Z AXIS RANGE

AUTOSCALE ON OFF

] [

WATERFALL SETUP

] to highlight ON.

] <number> <unit>.

] key specfies the range of complete traces you want displayed on the

Skew Angle

] to highlight OFF.

] to highlight ON.

Z-axis range values

Page 42

Working with the Display Agilent 35670A Quick Start Guide

Page 43

Making Measurements

Page 44

Page 45

Making Measurements

This section shows you how to make several basic measurements. Each of the major instrument modes is presented.

• FFT Analysis

• Real-time Octave Measurements (Option 1D1 only)

• Computed Order Tracking (Option 1D0 only)

• Swept Sine Measurements (Option 1D2 only)

• Correlation

• Histograms and Time Domain

Page 46

Making Measurements Agilent 35670A Quick Start Guide

To measure a spectrum

The Agilent 35670A evaluates signals and devices under 102.4 kHz. Dynamic range is 80 dB guaranteed. The analyzer has a 25.6 kHz real-time rate at 400 lines of resolution.

1 Initialize the analyzer.

Press [ Press [ or [

CHANNELS 1 2 4

] then press [

Preset

CHANNELS 1 2

DO PRESET

]

] to highlight 1.

2 Connect the signal source as shown in the illustration. 3 Select the measurement parameters.

Press [

Freq

] [

] <number> <unit>, then press [

START

] <number> <unit>.

STOP

4 Specify the averaging parameters.

Press [

] then press [

Avg

AVERAGE ON OFF

] to highlight ON.

Channel 1

Channel 2

Page 47

Agilent 35670A Quick Start Guide Making Measurements

5 Configure the display.

Press [

], then press[

Scale

AUTOSCALE ON OFF

] to highlight ON.

6 Measure the signal source.

Press [

The default number of averages is 10. To specify a different number of averages, press [ The average count at the bottom of the display is updated after each average.

Resolution can be set to 100, 200, 400 or 800 lines. Press

[

Freq

The lines of resolution appears at the top of the display.

The analyzer has an input impedance of approximately 1 Megohm. If your signal source needs to be terminated with a lower impedance, use an appropriate feedthrough terminator between the output of the signal source and the Channel 2 input.

Start

] [

Avg

NUMBER AVERAGES

] [

RESOLUTN (LINES)

] <number> [

ENTER

Page 48

Making Measurements Agilent 35670A Quick Start Guide

To measure frequency response — FFT

Adevice’s frequency response can be measured using the high-speed FFT analysis. The dynamic range is typically 80 dB. For better dynamic range, use the optional Swept Sine instrument mode.

1 Initialize the analyzer.

Press [ [

DO P RESET

Press [

Preset

Meas Data

] [

FREQ RESP 2/1

2 Connect the device-under-test (DUT) as shown in the illustration. 3 Specify the measurement parameters.

Press [ Press [ Press [ Press [

] [

Freq Source

] <number> <unit>, then press [

LEVEL

Window

] <number> <unit>, then press [

START

],[

PERIODIC CHIRP

] [

UNIFORM

] <number> <unit>.

STOP

SOURCE ON OFF

] to highlightON.

Source

Channel 1

Channel 2

Page 49

Agilent 35670A Quick Start Guide Making Measurements

4 Specify the triggering parameters.

Press [

Trigger

] [

SOURCE TRIGGER

5 Configure the display.

Press [ Press [

],thenpress[

Scale Disp Format

AUTOSCALE ON OFF

] [

MORE][BODE DIAGRAM

] to highlight ON.

6 Measure the DUT.

Press [

A triggered measurement and the uniform window selection produces a much more accurate response at the low end of the frequency spectrum. The periodic chirp provides more energy than random noise. It is a self-windowing signal that provides exactly the same stimulus from one measurement average to the next. Consequently, averaging is not required.

The analyzer’s source impedance is less than 5 ohms. If your DUT needs a specific source impedance, insert the appropriate resistor in series with the source output.

To display the measurement data on a logarithmic scale press [

Start

Trace Coord

] then press [

X-AXIS LIN LOG

] to highlight LOG.

Page 50

Making Measurements Agilent 35670A Quick Start Guide

To measure frequency response — Swept Sine (Option 1D2)

Swept Sine measurements are available only with those Agilent 35670A analyzers that are equipped with Option 1D2. The measurement range expands to 130 dB (typical), but measurement time increases as compared to the FFT instrument mode.

1 Initialize the analyzer.

Press [ Press [

] [

Preset

SWEPT SINE

DO PRESET

2 Connect the device-under-test (DUT). 3 Select the measurement parameters.

Press [ Press [ sweep. Press [

] [

Freq

RESOLUTN SETUP

Source

] <number> <unit>, then press [

START

] [

] <number> <unit>.

LEVEL

], then press [

SWEEP LIN LOG

] <number> <unit>.

STOP

] to highlight

for a linear

LIN

Option AY6

Source

Channel 1

Channel 2

Rear Panel

Channel 1

Channel 2

Page 51

Agilent 35670A Quick Start Guide Making Measurements

4 Configure the display.

Press [ Press [

],thenpress[

Scale

Disp Format

AUTOSCALE ON OFF

][

MORE][BODE DIAGRAM

] to highlightON. ].

5 Measure the DUT.

Press [

If you want to use a linear X-axis for the logarithmic sweep: Press [

If the overload indicator (as shown in the illustration) flashes, the analyzer is autoranging to provide the best signal-to-noise ratio.

Start

Trace Coord

] then press[

X-AXIS LIN LOG

] to highlight

LIN

Overload indicator flashes when analyzer is autoranging

Page 52

Making Measurements Agilent 35670A Quick Start Guide

To calibrate a microphone — Octave Analysis (Option 1D1)

Octave measurements are available only with those Agilent 35670A analyzers that are equipped with Option 1D1. Signals can be analyzed at frequencies up to 40 kHz in the single-channel mode. This task measures the sound pressure level of the calibrator.

1 Initialize the analyzer.

Press [ Press [

] [

Preset

OCTAVE ANALYSIS

DO PRESET

2 Connect the microphone input to the analyzer’s Channel 1 input as shown in the

illustration. Attach a calibrator to the microphone.

3 Configure the display.

Press [

],thenpress[

Scale

AUTOSCALE ON OFF

] to highlight ON.

4 Start the calibration.

Turn on the calibrator.

Start

Press [

Calibrator

Laboratory Microphone

Channel 1

Page 53

Agilent 35670A Quick Start Guide Making Measurements

5 Specify the calibration parameters.

Press [ Press [ Press [ Press [ Press [ Press [ Press [ Press [

Specify the calibration parameters to match the calibrator’s specifications.

The values you specify for the transducer units are retained, unless you preset the analyzer or turn it off.

] [

Input

XDCR UNIT ON OFF XDCR UNIT LABEL][PASCAL

Trace Coord

dB REF SETUP][dBSPL (20 uPA)

Marker Input

CAL VALUE AT MKR

XDCR UNIT CH1 SETUP

] to highlight ON.

] [

Y UNITS

],[

MARKER TO PEAK

] [

XDCR UNIT CH1 SETUP

], then press [

], <number> [

]

AMPLITUDE PK PP RMS

] to highlight RMS.

ENTER

Page 54

Making Measurements Agilent 35670A Quick Start Guide

To measure sound pressure level — Octave Analysis (Option 1D1)

Octave measurements are available only with those Agilent 35670A analyzers that are equipped with Option 1D1.

1 Initialize the analyzer.

If you have not already done so, calibrate the microphone.

See the previous measurement, “To calibrate a microphone.”

2 Set the calibrated microphone in front of the sound source. 3 Select the measurement parameters.

Press [ Press [ Press [ Press [

] [

Input Trace Coord

dB REF SETUP][dBSPL (20 uPa)

Rtn

FRONT END CH1 SETUP

] [

Y UNITS][EU

], then press [

A WT FLTR ON OFF

] to highlight ON.

Laboratory Microphone

Channel 1

Page 55

Agilent 35670A Quick Start Guide Making Measurements

4 Measure the sound source.

Press [

Calibration must be done unweighted. If you preset the analyzer, the transducer units you specify in the previous task, “To calibrate a microphone,” are lost.

To compute and display the IEC 65 impulse characteristic in the overall power band, press [ main marker to the far right band.

Start

IMPULSE ON OFF

] to highlight ON in the [

] menu. Use the knob to move the

Avg

Page 56

Making Measurements Agilent 35670A Quick Start Guide

To measure harmonic distortion

In addition to measuring harmonic distortion, this task measures the frequency and amplitude of the fundamental frequency.

1 Initialize the analyzer.

Press [

Preset

] [

DO PRESET

2 Connect the signal source as shown in the illustration. 3 Select the measurement parameters.

Press [ press [ Press [ Press [ or Press [

] [

Freq

STOP

Window

HANN

FLAT TOP

START

] <number> <unit>.

] <number> <unit>, then

4 Specify the triggering and averaging parameters.

Press [

Trigger

press [

TRIGGER SETUP][CHANNEL LEVEL

Press [

Avg

] [

CHANNEL 1 2 3 4

],thenpress[

] to highlight 1, then

AVERAGE ON OFF

], <number> <unit>.

] to highlight ON.

Channel 1

Channel 2

Page 57

Agilent 35670A Quick Start Guide Making Measurements

5 Configure the display.

Press [

], then press[

Scale

AUTOSCALE ON OFF

] to highlight ON.

6 Measure the signal source.

Press [ Press [ Press [ Press [

The results of the THD calculation appear at the bottom left of the analyzer’sdisplay. The number of harmonics used to calculate THD appears at the top of the screen. The default is 20 harmonics. (If there are fewer than 20 harmonics, the available number of harmonics are used.) To change the number of harmonics, use the [

NUMBER OF HARMONICS

Start Marker Marker Fctn

THD

],thenpress[

MARKER TO PEAK

] [

HARMONIC MARKER][FUNDAMENTL FREQUENCY

] softkey in the [

HARMONIC MARKER

] menu.

] [

Mkr Value

Harmonic Markers

THD calculation appears at the lower-left of the upper trace display box

The absolute marker, [

MARKER TO PEAK

], measures the amplitude of the fundamental frequency. If the harmonic markers do not line up with the harmonics, you will need to adjust the value of the fundamental frequency (The marker falls in the middle of the frequency bin.) Use the arrow keys or the knob to adjust the value of the fundamental frequency until the harmonic markers line up with the harmonics.

Fundamental freauency

Number of harmonics used to calculate THD

Page 58

Making Measurements Agilent 35670A Quick Start Guide

To characterize a tach pulse

To set the input parameters for a tachometer, you must first verify the amplitude of the tachometer pulse and determine the appropriate trigger level. This task is part of the initialization step for several tasks that follow.

1 Initialize the analyzer.

Press [ Press [ Press [

] [

Preset

HISTOGRAM/TIME

Meas Data

DO PRESET

], then press [

UNFILTERED TIME CH 1

2 Connect the tachometer to the analyzer’s Channel 1 input and to the tachometer input

on the rear panel. See illustration.

3 Configure the display.

Press [

Scale

] [

AUTOSCALE ON OFF

] to highlight ON.

4 Specify the measurement parameters.

Press [ Use the up arrow hardkey to increase the time record, until there are several tach pulses on the display. Press [ Press [

] [

Freq

Trigger Pause-Cont

RECORD TIME

] [

CHANNEL 1

Rear Panel

Tach

Channel 1

Page 59

Agilent 35670A Quick Start Guide Making Measurements

5 Select the tachometer parameters.

Press [ If the peak-to-peak value exceeds 4 volts, press [ Press [ level. Press [ (negative) edge of the signal. Press [

] [

Input

LEVEL

SLOPE POS NEG

TACH PULS PER REV

TACHOMETR SETUP

] <number> <unit>. The analyzer detects the tachometer signal at this

] to highlight NEG if you want the analyzer to detect the falling

]<number>[

] to highlight 20.

ENTER

TACH RANG +/- 20 4

6 Verify tachometer parameters.

Press [

TACH DISP ON OFF

top of the display.

This task uses the Histogram/Time instrument mode. It lets you view the tachometer input signal in the time domain. Unfiltered time channel data is not processed through anti-aliasing filters or bandwidth-limiting filters. For more information see online help.

You may be able to use the relative marker to determine the peak-to-peak value of the signal in Step 5. See “To measure a value relative to a reference” in the first section.

The tachometer indicator displays the number of tachometer transitions. If multiple transitions occur within any one edge of the signal, you will need to “clean it up” by specifying a tachometer delay in seconds. See the next task, “To specify tachometer holdoff time.”

] to highlight ON. The tachometer indicator appears at the

Tach Display

You can use the markers to determine appropriate value for

Page 60

Making Measurements Agilent 35670A Quick Start Guide

To specify tachometer holdoff time

If the edge of the tachometer input signal is not clean, the analyzer may trigger a measurement at inappropriate times. Holdoff time specifies a delay between valid tachometer transitions. The analyzer waits this amount of time before it accepts another tachometer input.

1 Initialize the analyzer.

See the previous task, “To characterize a tach pulse.” Press [

Pause-Cont

] to pause the measurement.

2 Configure the display.

Press [ Press [ between the markers, then press [ Using the knob, move the axes scale markers to an edge of the tachometer input signal.

],thenpress[

Scale

AXES SCAL MARKERS][CHANGE WIDTH

AUTOSCALE ON OFF

MOVE CENTER

] to highlight ON.

]. Using the knob, widen the gap

Rear Panel

Tach

Press [

SCALE AT MARKERS

Channel 1

Page 61

Agilent 35670A Quick Start Guide Making Measurements

3 Measure the holdoff time.

Press [

Marker

Using the knob, move the marker to the start of the first clean edge. Press [

REFERENCE TO MARKER

Now use the knob to move the marker past any inappropriate transitions on the edge of the signal. Note the Xr marker value at the top of the grid.

], [

REFERENCE SETUP

4 Specify the holdoff time.

Press [

Input

],[

TACHOMETR SETUP

], [

HOLDOFF TIME

], then press [

Mkr Value

5 Verify the tachometer input.

Press [ Press [ Press [ Press [

The Xr marker value displayed in Step 3 is specified as the holdoff time in Step 4.

The tachometer indicator at the top of the display is reading the tachometer input signal from the rear panel. The display is showing the tachometer signal from Channel 1.

], [

Scale Inst Mode Meas Data Start

AXES SCAL MARKERS

] [

ORDER ANALYSIS

] [

PWR SPEC CHANNEL 1

], then press [

FULL SCALE

[SCALE AT MARKER] displays only that part of the trace between the [AXES SCALE MARKER]

Marker Reference

Relative Marker value specifies holdoff time

Relative Marker

Page 62

Making Measurements Agilent 35670A Quick Start Guide

To measure an order spectrum

Order analysis measurements are available only with those Agilent 35670A analyzers that are equipped with Option 1D0.

1 Initialize the analyzer.

Set the input parameters for the tachometer. See the previous tasks, “To characterize a tach pulse” and “To specify tachometer holdoff time.” Press [ Press [

Marker Inst Mode

] [

MARKER ON OFF

] [

ORDER ANALYSIS

] to highlight OFF.

2 Connect your device-under-test (DUT) as shown in the illustration.

If the accelerometer or displacement transducer requires ICP current, press [

SUPLY ON OFF

Input

] [

CH1 AUTO RANGE

] to highlight ON.

]andthenpress[

FRNT END CH1 SETUP][ICP

Rear Panel

Tach

Channel 1

Transducer

Page 63

Agilent 35670A Quick Start Guide Making Measurements

3 Specify the measurement parameters.

Press [ Press [ Press [ Press [

] [

Input

XDCR UNIT ON OFF XDCR SENSITVTY XDCR UNIT LABEL][g

XDCR UNIT CH1 SETUP

] to highlight ON.

] <number> <unit>.

] [

Rtn

4 Configure the display.

Press [

Trace Coord

Press [ highlight Press [ Press [ Press [ Press [ highlight Press [

],thenpress[

Scale

OFF.

Trace Coord

AMPLITUDE PK PP RMS

Display Format

ON.

SKEW ON OFF

] [

LOG MAGNITUDE

AUTOSCALE ON OFF

] [

Y UNITS

]. ] to highlight PK.

] [

WATERFALL SETUP

] to highlight ON.

] to highlight ON, then press it again to

], then press [

WATERFALL ON OFF

]to

5 Measure the DUT.

Press [

If you turn on the ICP current source in Step 2, AC coupling is automatically engaged to maximize dynamic range and minimize distortion. Allow approximately 30 seconds for time to charge the AC/DC capacitor and for the input range to stabilize.

Start

Page 64

Making Measurements Agilent 35670A Quick Start Guide

Page 65

Saving and Plotting Data

Page 66

Page 67

Saving and Plotting Data

This section shows you how to perform some basic disk operations and how to plot the contents of the analyzer’sscreen.

Page 68

Saving and Plotting Data Agilent 35670A Quick Start Guide

To format a flexible disk

Insert a 3.5-inch flexible disk into the analyzer’s internal disk drive.

1 2 Press [

Press [

3 Press [

Disk Utility

Rtn

FORMAT DISK][DISK TYPE

] [

DEFAULT DISK][INTERNAL DISK

], then press [

LIF DOS

] to highlight LIF.

The default is DOS.

4 Press [ 5 Press [

INTRLEAVE FACTOR

PERFORM FORMAT][ENTER

] [0] [

]. [0] is the default.

ENTER

Caution You can damage both the disk and the drive if you attempt to eject a disk when the

“FORMAT DISK in Progress” message is displayed or when the disk’s busy light is on.

You must format a 3.5-inch flexible disk before you can use it to store Agilent 35670A data. Use a double-sided double-density or high-density disk that is not write-protected. (See the illustration.) The analyzer takes about two and a half minutes to format a disk and is unavailable for other tasks during that time.

The analyzer offers two types of disk formats—LIF and DOS. Step 3 sets the format. Step 4 defines the sector numbering (interleave factor) to the default value (1 for LIF formatted disks or 3 for DOS formatted disks). For more information on the formatting parameters, use online help.

The Disk-eject button

Do not eject the disk when the “busy” light is on

Usea3.5-inch flexible disk (DS, DD) or (DS, HD)

Page 69

Agilent 35670A Quick Start Guide Saving and Plotting Data

Tosaveatracetoafile

Activate the trace if the one you want to save is not currently active. See

“To select the active trace” in the Working with the Display section.

2 Press [

Save/Recall

3 Type a file name, then press [

or Use the default name.

After you have entered a file name the analyzer saves the active trace to a file on the default disk. The analyzer automatically increments the default file name during successive save operations. For more information on typing a file name and selecting the default disk, see “Totypeatextstring” and “To select the default disk” earlier in this book.

Tosaveatracetoadataregister,repeatstep2exceptpressoneofthedataregister softkeys, rather than the [

] [

SAVE DATA][SAVE TRACE][INTO FILE

ENTER

INTO FILE

] softkey.

Page 70

Saving and Plotting Data Agilent 35670A Quick Start Guide

To recall a trace from a file

The analyzer recalls the highlighted file

Press [

Save/Recall

], then press [

CATALOG ON OFF

] to highlight ON.

2 Turn the knob to highlight the file you want to recall. 3 Press [

RECALL DATA][RCL TRACE][FROM FILE INTO D1][ENTER

4 Activate the appropriate trace if the one you want to replace is not currently active.

See “Toactivateatrace.”

5 Press [

Meas Data

It is generally easier to recall a trace if you display the disk catalog and highlight the trace file first. When you do this, the prompt box that is displayed when you press [

FROM FILE INTO D1

enter to recall the file. If you do not display the catalog first, you will need to type the correct file name into the prompt box before you press enter.

The analyzer always recalls a trace into a data register. Steps 4 and 5 allow you to view the recalled trace by selecting the contents of that data register for display.

] [

MORE CHOICES][DATA REGISTER][D1

] already contains the correct file name. You only need to press

Page 71

Agilent 35670A Quick Start Guide Saving and Plotting Data

To save a trace to a data register

Activate the trace if the one you want to save is not currently active. See “To select

theactivetrace.”

2 Press [

Save/Recall

] [

SAVE DATA][SAVE TRACE][INTO D1

Data registers are cleared each time you turn off the analyzer. The analyzer uses the data registers to store the contents of certain operations.

• D6—is a default data register for the curve fit operation.

• D7—is a default data register for the curve fit operation.

• D8—is the default data register for the synthesis operation.

To recall a trace from a data register, see steps 4 and 5 of “To recall a trace from a file.”

Page 72

Saving and Plotting Data Agilent 35670A Quick Start Guide

To setup your plotter — GPIB

Connect the GPIB ports of your plotter and analyzer with an GPIB cable.

1 2 Verify the GPIB address of the analyzer.

See “To set the analyzer’sGPIBaddress” in the Setting Up section.

3 Turn on the plotter. 4 Determine the GPIB address of the plotter.

If you need to change the setting on the analyzer, press [ [

PLOTTER ADDRESS

] <number> [

ENTER

Local/GPIB

]

5 Press [

SYSTEM CONTROLLR

The current setting for the plotter’s address appears at the top of the display. Refer to you plotter’s documentation to determine its GPIB address. If you need to change it, substitute the value for <number> in Step 4.

If there is more than one controller on the bus, the analyzer needs to have active control instead of system control to initiate a plot. See “Passing Control” in the GPIB Programmer’s Guide for more information.

Page 73

Agilent 35670A Quick Start Guide Saving and Plotting Data

To setup your plotter — Serial

Connect the serial ports of your plotter and analyzer with a RS-232-C cable.

1 2 Check the plotter’s documentation to verify the serial configuration. 3 Turn on the plotter. 4 To set the plotter’s baud rate on the analyzer, press [

SETUP][BAUD RATE

]. The softkey steps through the available values.

Plot/Print

] [

MORE SETUP][SERIAL

5 In the same menu, set the transmitter’s (the analyzer’s) handshake pacing type. Press

[

XMIT PACE

]. The softkey steps through the available values.

6 Set the other parameter values, if you need to change the settings.

The configuration is saved in non-volatile RAM. Refer to your plotter’s documentation to determine the required serial configuration. The analyzer is considered the transmitter and the plotter is considered the receiver.

The default values should satisfy the configuration for most plotters. Additional parameters that you can change are:

• [

BITS/CHAR

• [

STOP BITS

• [

PARITY

• [

PRTY CHK

• [

RCVR PACE

] — specifies the number bits in each character.

] — specifies the number of “stop bits” sent with each character.

] — sets the parity generated for characters.

] — enables parity verification capability.

] — sets the receiver handshake pacing type.

Page 74

Saving and Plotting Data Agilent 35670A Quick Start Guide

To plot screen contents

Set up your plotter.

1 2 Press [ 3 Press [

Press [

4 Press [

Press the [

Local/GPIB

Plot/Print

Rtn

PLOT/PRNT DESTINATN

OUTPUT TO GPIB

] [

SYSTEM CONTROLLR

][

PLO T/PRNT DEVI CE][HP-GL PLOTTER

] if your plotter is connected to the GPIB

(see “To setup you plotter—GPIB.” or Press [

OUTPUT TO SERIAL

] if your plotter is connected to the RS-232-C (see “To setup you plotter —RS-232-C.” or Press [

OUTPUT TO PARALLEL

] if your plotter is connected to the parallel port. or Press [

OUTPUT TO FILE

] to plot the contents of the screen to a file

(see “To select the default disk”).

5 Press [ 6 Press [

Rtn

Plot/Print

] [

START PLOT/PRNT

The analyzer is only able to initiate plotting if the plotter is connected to the appropriate port and if the analyzer is designated as the system controller. All of the contents of the screen, except the softkey labels, are plotted when you complete this task.

To print the contents of the screen, press [

PLOT/PRNT DEVICE][RASTER PRINTER

Step 3. Be sure a printer is connected to the appropriate interface port.

]in

Page 75

Automating Measurements

Page 76

Page 77

Automating Measurements

This section shows you how to customize your analyzer and introduces the analyzer’s keystroke recording feature . Keystroke recording is an optional feature that is available under the [

] hardkey when you order Option 1C2, Instrument BASIC.

Basic

Page 78

Automating Measurements Agilent 35670A Quick Start Guide

To select the active Instrument BASIC program

Active Program

Press [

1 2 Press [

] [

Basic

PROGRAM 1

INSTRUMNT BASIC][SELECT PROGRAM

]. or Press [

PROGRAM 2

]. or Press [

PROGRAM 3

]. or Press [

PROGRAM 4

]. or Press [

3 Press [

PROGRAM 5

Rtn

The analyzer has five program buffers. Only one program buffer can be active at any one time. The currently active program appears at the top of the display.

The softkeys may have different labels. Press the softkey corresponding to the program you want to activate.

Page 79

Agilent 35670A Quick Start Guide Automating Measurements

To record a measurement sequence

Select the active program.

(See the previous task, “To select the active Instrument BASIC program.”

2 Press [

3 Press [ 4 Press the keys in your measurement sequence. 5 Press [

GPIB Commands equivalent to your key presses are enclosed in quotes

] [

Basic

Press [

PERFORM SCRATCH

ENABLE RECORDING

] to end recording.

Basic

INSTRUMNT BASIC][UTILITIES][SCRATCH][SCRATCH

] [

Rtn][Rtn

When you record a measurement sequence with Instrument BASIC, the analyzer converts key-presses to equivalent GPIB commands. The commands are then inserted in BASIC program lines in the analyzer’s active program buffer. The second step of this task clears the program buffer so your measurement sequence will not be inserted into an existing program. The remaining steps actually record your key-presses.

To produce consistent results, it is important to make [ keys you press in step 4. [

DO PRESET

] eliminates many unknowns by returning most

Preset

] [

DO PRESET

] the first

analyzer parameters to their default states. To learn more, see Using Instrument BASIC with the Agilent 35670A.

Recorded BASIC program is displayed when you press [BASIC] [Instrument BASIC] [EDIT PROGRAM]

Page 80

Automating Measurements Agilent 35670A Quick Start Guide

To execute a recorded measurement sequence

Press [

1 2 Press [

Basic

RUN PROGRAM 1

]. or Press [

RUN PROGRAM 2

]. or Press [

RUN PROGRAM 3

]. or Press [

RUN PROGRAM 4

]. or Press [

RUN PROGRAM 5

This task runs the program currently loaded in the selected program buffer. To run the program in the active program buffer, press [ [

RUN PROGRAM

Basic

] [

INSTRUMNT BASIC

]

If your program is stored on one of the analyzer’s disks, you will need to load it into the active program buffer before running it. (You can recall programs with the [

RECALL PROGRAM

] softkey, located in the [

Save/Recall

] menu.

Once your program is running, you can stop it by pressing one of three keys:

• Press [

] to PAUSE the program.

Basic

Local/GPIB

Preset

] to ABORT the program.

] to ABORT the program. To preset the analyzer, press [

DO PRESET

See Using Instrument BASIC with the Agilent 35670A for more information on pausing and stopping a program.

Page 81

Agilent 35670A Quick Start Guide Automating Measurements

To customize your analyzer

Creating an AUTO_ST.STA file allows you to automatically specify a specific measurement state when you turn on the analyzer or when you press [ [

RECALL AUTOSTATE

Preset

]

1 Initialize the analyzer.

Press [

Preset

] [

DO PRESET

2 Configure the analyzer to fit your application. 3 Select the default disk, either the non-volatile RAM disk or the internal disk.

See “To select the default disk” in the second section, Setting Up.

4 Save the measurement state.

If the internal disk drive is the default disk, insert a 3.5 inch floppy disk. Press [

Save/Recall

Press [

ENTER

At power-up, the analyzer searches the internal disk drive first and then searches the non-volatile RAM disk for the “AUTO_ST” file. If it is found, the analyzer loads the measurement state immediately.

] [

SAVE MORE][SAVE AUTOSTATE

Page 82

Automating Measurements Agilent 35670A Quick Start Guide

To save an Instrument BASIC program to disk

Select the active Instrument BASIC program.

1 2 Select the default disk. 3 Press [

Press [

Save/Recall

SAVE PROGRAM

] [

4 Type a file name, then press [ 5 If the program had been saved before, press [

After you have entered a file name the analyzer saves the active program to a file on the default disk. If the file name ends with a number (for example, PROG1), the analyzer automatically increments the default file name during successive save operations. For more information on typing a file name and selecting the default disk, see “To type a text string” and “To select the default disk” earlier in this book.

To save a program, press [SAVE PROGRAM]

SAVE MORE

ENTER

OVERWRITE FILE

Determines if program is saved as an ASCII file or binary file

If program already exists, press [OVERWRITE FILE]

Page 83

Index

Page 84

Page 85

Index

AC power 2 active trace 18 - 19 address

analyzer 14 plotter 52

analyzer

customizing 59 HP-IB address 14

setting the clock 15 AUTO_ST 59 autoscaling 22 autosequence 57 average, specifying 29

BASIC

See Instrument BASIC

battery power 3

calibrating, microphone 34 clock, setting 15

data register, saving a trace 51 date, setting 15 DC power 3 disk

default 16

formatting 48

saving a program 60

saving a trace 49 display

activating a trace 18

measurement state 23

plotting contents 54 scaling 22 selecting data 20

dynamic range 28

entering

numbers 10 parameters 24 text 9

FFT, frequency response 30 files

recalling 50 saving 49

formatting disks 48 frequency response

FFT 30 swept-sine 32

frequency span, setting 28

GPIB

analyzer’s address 14 plotter’s address 52 plotting 54

harmonic distortion 38 help, online 4 histogram,unfiltered time 40 holdoff time 42

Page 86

ICP, turning on 45 impedance

input 29, 31 source 31

inputs

activating channels 6-7 setting reference 6-7

Instrument BASIC

active program 56 recording a program 57 running a program 58 saving to a file 60

instrument modes 8 instrument state

See measurement state

internal disk 16

keyboard, using 9 keystroke recording 57

line power,using 2

map displays 25 markers

absolute 39 axes scale 41 harmonic 39 moving the main 11 reference 12 relative 12

mass storage 16 measurement data

scaling 22 selecting 20

measurement state 5

at power-up 59 displaying 23 updating 24

order spectrum 45 sound pressure level 36 spectrum 28 tach pulse 40 THD 38 time waveform 41

octave analysis

microphone calibration 34

sound pressure level 36 online help, using 4 order analysis 45 order spectrum 45 overload indicator 33

parameters, entering 24 peak-to-peak value, determining 12, 41 plotter

HP-IB address 52

serial 53 plotting, screen 54 preset 5 printing, screen 54 program

active 56

executing 58

recording 57

running 58

recalling

atrace 50

files 50 recording keystrokes 57 reference markers 12 register, saving a trace 51 relative markers 12 resolution 29 RPM indicator 41

measuring

frequency response 30, 32 fundamental frequency 38 microphone calibration 34

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RS-232-C

configuring 53 plotting 54

running a program 58

saving

a program 60

trace data 49 scaling 22 selecting data 20 setting default disk 16 setup state 5 sound pressure level 36 span, setting 28 spectrum

measuring 28, 45

peak-to-peak value 12 storage devices 16 swept-sine analysis,frequency response

tachometer

characterize 40

holdoff time 42 text, entering 9 text, typing 9 time stamp 15 trace

activating 18

displaying 18 - 19

scaling 22 trace data

in waterfall 25