HP 3326A User Manual

HEWLETT

PACKARD

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.

WARRANTY

This Hewlett-Packard product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by shall prepay shipping charges to -hp- and -hp- shall pay shipping charges to return the product to Buyer. However,

Buyer shall pay all shipping charges, duties, and taxes for products returned to

HP software and firmware products which are designated by HP for use with a hardware product, when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in materials and workmanship. If HP receives notice of such defects during their warranty period, HP shall repair or replace software media and firmware which do not execute their programming instructions due to such defects. HP does not warrant that the operation of the software, firmware or hardware shall be uninterrupted or error free.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by

Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES. HEWLETT-PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER

-hp- from another country.

LEGAL THEORY.

-hp-. Buyer

ASSISTANCE

Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are provided at the back of this manual.

Reproduced With Permission Courtesy Agilent Technologies, Inc.

HEWLETT PACKARD

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service, and repair 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. Hewlett-Packard Company assumes no liability for the customer's failure to comply with these requirements. This is a Safety Class

instrument.

GROUND THE INSTRUMENT To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground.

The instrument is equipped with a three conductor ac power cable. The power cable must either be plugged

into an approved three-contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly connected to an electrical ground (safety ground) at the power outlet. The power

(lEC)

jack and mating plug of the power cable meet International Electrotechnical Commission

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instru-

ment in such an environment constitutes a definite safetv hazard.

safety standards.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must not remove instrument covers. Component replacement and internal adjustments

must be made by qualified maintenance personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power and discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resus-

citation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform any unautho-

rized modification to the instrument. Return the instrument to a Hewlett-Packard Sales and Service Office for service and repair to ensure that safety features are maintained.

DANGEROUS PROCEDURE WARNINGS Warnings, such as the example below, precede potentially dangerous procedures throughout this manual. Instruc-

tions contained in the warnings must be followed.

Dangerous voltages, capable of causing death, are present in this instrument. Use extreme caution when handling, testing, and adjusting.

SAFETY SYMBOLS

General Definitions of Safety Symbols Used On Equipment or In Manuals.

Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument.

Indicates dangerous voltage (terminals fed from the interior by vol-

1000

tage exceeding

Protective conductor terminal. For protection against electrical shock in case of a fault. Used with field wiring terminals to indicate the terminal which must be connected to ground before operating equipment.

Low-noise or noiseless, clean ground (earth) terminal. Used for a signal common, as well as providing protection against electrical shock in case of a fault. A terminal marked with this symbol must be connected to ground in the manner described in the installation (operat-

ing) manual, and before operating the equipment.

volts must be so marked).

WARNING

NOTE

Frame or chassis terminal. A connection to the frame (chassis) of the equipment which normally includes all exposed metal structures.

Alternating current (power line).

Direct current (power line).

Alternating or direct current (power line)

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, condition or the like, which, if not correctly performed

or adhered to, could result in injury or death to personnel.

The CAUTION sign denotes a hazard. It calls attention to an operat-

ing procedure, practice, condition 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.

The NOTE sign denotes important information. It calls attention to

procedure, practice, condition or the like, which is essential to

highlight.

TABLE

OF CONTENTS

HP 3326A TURN ON AND WARM UP CH A AND CH B OUTPUTS SELECTING AN OPERATING MODE SELECTING THE OUTPUT FUNCTION

DATA ENTRY AND MODIFICATION THE ENTRY KEYS LINEAR FREQUENCY SWEEP DISCRETE FREQUENCY SWEEP MODULATION SAVING CALIBRATION AND SELF TEST HP-IB STATUS KEYS EXTERNAL TRIGGER MARKER SYNC A OUTPUT 20-33 MHz L.O. OUTPUT (EXTENDED FREQUENCY) PHASE LOCK TO EXT REFIOVEN STABILIZED FREQUENCY OPTION

Chapter

DESCRIPTION OF THE HP-IB HP 3326A HP-IB CAPABILITY HP-IB INTERFACE MANAGEMENT LINES TALK VIEWING THE HP 3326A HP-IB ADDRESS CHANGING THE HP 3326A HP-IB ADDRESS BUS MESSAGES SERVICE REQUEST THE STATUS BYTE MASKING THE STATUS BYTE

RECALLING AN INSTRUMENT STATE. AND MEMORY OPERATIONS 1-50

Z-BLANK (PEN LIFT) 1 X-DRIVE OUTPUTS

HP-IB

LISTEN ADDRESSES

........ ......

INDICATORS / CONNECTOR

Operation

.... .... ....

, , ,

.... .......

...... ......

.......

. . . . .

. . ........ . .

...

. . . . ... ...

... . . ...

... ... . . . . .....

........ ... ....

. . .......

. .

.... .........

........ .....

....... . .

. .

.....

. . ....

...

.......

. . .

1-2 1-5

1-6 1-12 1-14 1-20 1-29 1-39 1-44

1-53 1-57

1-59 1-59 1-63 1-64

1-66

2-1 2-2 2-2 2-2 2-4 2-4 2-4 2-6 2-7 2-8

Chapter

3326A

REMOTE FRONT PANEL OPERATION COMMAND SYNTAX BUS MODES VIEWING THE HP 3326A HP-IB ADDRESS CHANGING THE HP 3326A HP-IB ADDRESS INTERROGATING THE HP 3326A FOR SETUP PARAMETERS DISPLAYING THE HP 3326A SETUP PARAMETERS MODIFYING PARAMETERS DISPLAY CONTROL SAVING OR RESTORING AN HP 3326A SETUP HP 3326A IDENTIFICATION TRIGGERED SWEEPS READING AND MASKING THE STATUS BYTE ERROR CODES HP 3325A COMPATIBILITY UNITS HP 3326A MNEMONICS SUMMARIES

HP-IB

Commands

.... . . ...

............ ...

...... ........

..... ...... . .

. . ...

..................

....

. . ....

........

.....

........ . .

.... . . . .

. . . . .....

...........

....

......

. . ....

....

...

Appendices

APPENDIX A A 1 APPENDIX APPENDIX C lns~de Rear Cover

3-1 3-1 3-3 3-3 3-4 3-4

....

3-4 3-5 3-6 3-6 3-7

3-10 3-1 2 3-13 3-13

3-8

CHAPTER

OPERATION AND REFERENCE

Chapter

Table of Contents

HP 3326A TURN ON AND WARM UP CH A AND CH B OUTPUTS

SELECTING

OPERATING MODE

...................................

SELECTING THE OUTPUT FUNCTION DATA ENTRY AND MODIFICATION THE ENTRY KEYS 1-20 LINEAR FREQUENCY SWEEP

..........................................

................................

DISCRETE FREQUENCY SWEEP 1-39 MODULATION SAVING

AND

MEMORY OPERATIONS CALIBRATION AND SELF TEST HP-IB STATUS KEYS EXTERNAL TRIGGER MARKER SYNC A OUTPUT 1.63

20-33

MHz

.............................................

RECALLING AN INSTRUMENT STATE,

................................

INDICATORS I CONNECTOR

........................................

Z-BLANK (PEN LIFT) I X-DRIVE OUTPUTS

..........................................

L.O.

OUTPUT (EXTENDED FREQUENCY)

........................

1.2 1-5

..........................

1-6 1-12 1-14

1-29

..............................

1-44

...............................

1.50

1.53

...............

1.57

1.59

.............

............

1-59

1-64

PHASE LOCK TO EXT REFIOVEN STABILIZED

FREQUENCY OPTION 1-66

......................................

Qservice ----- This Document is a complete scan from the Original HP - Agilent Manual ----- Qservice

Turn

on and Warm

HP 3326A TURN

Turn On and Power

Connect the HP 3326A to a suitable power source and depress the POWER switch to

POWER

apply power to the entire HP 3326A. When power is applied, the HP 3326A initially displays "HP 3326A" followed by a list of the options installed. The HP 3326A then initiates a series of self tests and calibrates internal circuits. During a self test, all indicators (except the EXT REF indicator) and display segments are illuminated then extinguished, and a series of internal tests are initiated. After each internal test, PASS

FAIL followed by a test number is displayed to indicate the test results. During a

or self test, the outputs are disabled.

AND WARM UP

Self

Tests

When power is removed from the HP 3326A with the POWER key, the frequency reference circuits (Option 001) to maintain frequency accuracy.

Turn On State

The initial state of the HP 3326A at power up is dependent upon the setting of internal

the setup state selected prior to removing power can be selected as the turn on state.

Warm

An HP 3326A without the high stability frequency reference (Option 001) requires 30

3326A is

in a standby condition. In the standby condition, power is applied to the high stability

switches. The normal turn on state is the preset state described in "The Preset State and the INSTR PRESET Key". However, through the use of the internal SAVE switch,

Setting of internal switches must be done by qualified service personnel. The location and settings of the SAVE switch are described in the HP

minutes of operation to meet all specifications. An HP 3326A with Option 001 requires

minutes of operation to meet frequency specifications if power is disconnected for

less than 24 hours. If power is disconnected from the HP 3326A with Option 001 for

3326A Service Manual.

Turn

and Warm up

more than 24 hours, up to 72 hours of operation may be required to meet frequency

001

specifications. The HP 3326A with Option

requires 30 minutes of operation to meet

other specifications.

NOTE

When power is removed from the HP the POWER key, the dition. In the standby condition, power is applied to the high stability frequency reference circuits

(Option

The Preset State and the lnstr Preset Key

INSTR

PRESET

The preset state of the HP 3326A is listed in Figure the preset state by pressing the green INSTR PRESET (INSTRument PRESET) key. INSTR

PRESET provides a convenient starting state for establishing an instrument setup. INSTR PRESET does not destroy instrument states or discrete frequency sweep elements stored in the internal nonvolatile memory.

3326A

to maintain frequency accuracy.

is in a standby con-

1-1.

The HP 3326A is restored to

with

HP-IB

Example:

"RST"

Turn on and Warm

CH A and

B Outputs

CH A AND

OUTPUTS

CH A and CH B Output Connectors

The CH A (channel on the front panel. Option 003, Rear Panel Main Signal Outputs, replaces the front panel

channel The channel

tive output for combined and internal modulation operation. For combined and internal modulation operation, the channel B output is is used internally and is unavailable at the CH B connector.

and B outputs with rear panel outputs.

and CH B (channel B) output connectors are normally located

connector, in addition to being the output for channel

is also the ac-

The output impedance is 50 20 dB over the range of 100 kHz to 13 MHz. The output impedance with the high voltage option enabled is less than 2 of 50 kHz to 1 MHz. Both outputs share the same ground and may be floated up to

42 volts peak.

The maximum peak voltage lac + dc) that can be safely applied between chassis and the outer conductor of the

tors is

from 0 to 100 kHz, with a return loss of greater than

from 0 to 50 kHz, and less than 10 D over the range

3326A

volts peak.

input and output connec-

Setup For Viewing Output

Figure 1-2 illustrates a simple setup to view the HP 3326A outputs and observe the

effects of changing the HP 3326A settings. For example purposes, the selection of an oscilloscope displaying both channels simultaneously.

Waveforms

not critical although a dual channel oscilloscope has the advantage of

SELECTING AN OPERATING MODE

The

Mode

Key

The MODE key selects the operating mode of the HP 332614. Each time the MODE key

is pressed, the operating mode sequences through the

and PULSE operating modes, The mode selected is indicated by the illuminated indicator. COMBINED operation is enabled by pressing the blue SHIFT key prior to the MODE

key. The operating modes affect operating limits, operating characteristics, and selec-

tion of the CH A and CH

limits are included in the applicable sections for the characteristics and limits. When

the 2 PHASE or PULSE mode is selected, the HP 3326A performs an internal phase calibration. During a mode change, the channel

outputs. The effects on the operating characteristics and

CHANNEL, 2 PHASE, 2 TONE,

and B outputs are disabled.

Channel

Mode

STEP

In the 2 CHANNEL

mode, the

3326A

operates as two independent synthesizers. Sweep parameters, frequency, amplitude, dc offset, external modulation, sine wave output, and square wave output is independent for each channel. With internal modulation

enabled, the channel thesizer. Figure

HP-18

Examples:

1-3

synthesizer is used to internally modulate the channel A syn-

illustrates the effect of changing frequency in the 2 CHANNEL

"MODE1"

"MODE TWOC"

mode.

STEP

Selectmg

Phase

Operating

Mode

STEP

In the 2 PHASE

1-4).

The phase offset of channel B with respect to channel A remains constant as fre-

mode, both channel A and B frequencies are the same (see Figure

quency is changed. Amplitude, dc offset, external amplitude modulation, sine wave output, and square wave output is independent for each channel,

HP-18

Examples:

"MODE

TWOP"

STEP

Selectmg an Operating

Mode

In the 2 TONE mode, the channel B frequency tracks changes to the channel A fre-

1-5).

quency (see Figure

channel

is 100 kHz. Amplitude, dc offset, external amplitude modulation, sine wave

The maximum frequency difference between channel A and

output, and square wave output are independent for each channel.

HP-IB

Examples:

"MODE3" or "MODE TWOT"

STEP

ating

Mode

Pulse

,-*-m,s

Mode

---,*

STEP

In the

PULSE

nel A square wave output (see Figure

mode, the channel B square wave output

1-6).

modulat~on are independent for each channel

HP-IB

Examples:

"MODE$"

"MODE

PULS"

the complement of the chan-

Amplitude, dc offset, and external amplitude

STEP

Combined Operation

With COMBINED operation, the channel B output is diverted and summed with the channel A output (see Figure of each channel by be entered if DC is selected as the function, however, when alternate functions (OFF, sine wave, or square wave) are selected, the DC offset level is returned to zero. Note that the peak-to-peak amplitude of the output signal is a function of the phase, frequency! and amplitude of each channel. COMBINED operation is selectable only in the

NEL,

modulation.

HP-IS

Examples:

1-7).

COMBINED operation reduces the amplitude output limit

50%

(6.02 dB) and sets the dc offset level to zero. DC offsets can

CHAN-

PHASE, and 2 TONE MODES. COMBINED operation is disabled for internal

STEP

"CMBI

or "CMB ON"

STEP

Selecting the Output Function

SELECTING THE OUTPUT FUNCTION

The

Off,

and

Keys

The CH A and CH B keys select the output waveform for the channel A and channel

outputs, respectively. Each time the CH A or CH B key is pressed, the output waveform sequences through the OFF, The selected output is indicated by an illuminated indicator. If the pulse mode is selected, the sine wave and DC only output is removed from the output waveform selection sequence. The blue high voltage (HV) legends printed below these keys are active only if the high voltage option (Option

TI,

and

Indicators

When all function indicators are extinguished, the output channel is disabled.

HP-16 Examples:

FCNAO" or "FCNA OFF" "FCNBO" or "FCNB OFF"

The mode is selected, the sine wave output is removed from the output waveform selection sequence.

(sine wave) indicator illuminates when a sine wave output is enabled. If the pulse

(sine wave), % (square wave), and DC outputs.

002)

is installed.

HP-I6 Examples:

"FCNA1"

"FCNA SIN" "FCNB

"FCNB SIN"

HP-18

Examples:

FCNA2"

Selectmg the

Output

Function

"FCNA SQR"

"FCNB

2" or "FCNB

SQR"

The DC indicator illuminates when a dc only output is enabled. With dc only, the ac portion of the output is suppressed. The output amplitude for the DC function is controlled by the value entered for the DC OFFSET key.

The

HP-18

Examples:

High

Voltage Option (Option

The HV (high voltage) key enables or disables the high voltage output option. The HV key is available by pressing the blue key.

HV indicator, to the left of the display, illuminates when a high voltage output is enabled. The high voltage option increase the available output voltage range by a factor of four with a maximum value of option reduces the maximum output frequency to

impedance. The output signal is momentarily set at zero volts if internal attenuator set-

tings change.

"FCNAS"

"FCNA DC" "FCNBS"

"FCNB

DC"

002)

SHIFT

The channel B high voltage option is disabled if the

channel

quency must be reduced below

high voltage option can be enabled.

frequency is greater than

3326A

mode is changed. The channel B fre-

key prior to pressing the CH A or CH

volts peak-to-peak. Enabling the high voltage

MHz, and decreases the output

WTE

MHz

and the

MHz

before the

HP-IB

Examples:

"HVAI

"HVBI

or or

"HVA ON" "HVB ON"

Data Entry and Modification

DATA ENTRY AND MODIFICATION

Selecting the Channel for Modification

Prior to entering data to specify the HP 3326A output, it is necessary to select the chan-

nel to be modified with the CHAN key to the left of the display window. The channel currently selected is indicated by the illuminated CH A or CH CHAN key. The CHAN key selects the alternate channel for display and modification each time the CHAN key is pressed.

HP-IB

Examples:

"CHA" "CHB"

The Data Keys

Entering setup values with the numeric keypad is a simple three step process. Select a parameter to change, enter the desired value (most significant digit first), and end the entry with a units key. For example, to change the output amplitude to 1 Vrms, press the AMPTD (amplitude) key and display the current amplitude value. Press the 1 key

in the numeric keypad, and press the kHz Vrms mSEC units key to end the entry (see

Figure 1-9). Notice that the Vrms units from the kHz Vrms to the data value. The HP 3326A assigns the units to the data value that corresponds to parameter being changed. If the entered value exceeds the HP 3326A range limits, the entered value is ignored and an error message is displayed. To cancel an incom-

plete data entry, press any key that requires the display for data entry (see Figure

lists the keys that accept numeric data.

indicator next to the

mSEC units key are assigned

1-8).

Data

Entry

and Modif~cation

The value in the display window is edited during data entry with the BACK SPACE key.

Each time the BACK SPACE key is pressed, the least significant digit or decimal point is removed from the display. After the incorrect digits are removed from the display

1-9

value, data entry can continue with the numeric keypad and units keys. Figure

illus-

trates the use of the BACK SPACE key.

Figure

1-9.

Data

Entry

Example

Data Entry and Modification

Error

Messages

If an attempt is made to enter or modify operating parameters beyond the capabilities, the new input is ignored and an error message and code is displayed. Figure

1-1

messages and codes is included

LOCK 12 (local LOCKout) The LOCAL key is pressed while the

NTR 40, 46, 47

SUFX 60, 65

3326A

lists the error messages and explanations of the errors. A complete list of the error

Appendix A.

HP 3326A

(INTeRrogate) The value of the functron requested cannot be displayed because of the mode, modulation, channel, or sweep selected.

(SUFfiX) The units key selected is improper for the function selected

local lockout

AMPL 80 (AMPLltude) Combined operation is selected and the cur-

rept amolitude is too larae

MODE 87 (MODE) The requested value or function is incompatible

with the mode selected.

CMBR 89 (CoMBineR) The requested value or function is incompat-

ible with combined operation.

DUTY

DSWP

110,

114

(DUTY cycle) The duty cycle of a PULSE a sweeo.

(Discrete frequency SWeeP) The d~screte frequency sweep

invalid because of mode selected or the lack of

sweeD elements.

too narrow

for

Data Entry and Modification

DSHV

DSML

DSMD 117 (Discrete Sweep

115

116

123

130, 136,

CRPT

160

(Discrete Sweep High Voltage) The high voltage option is enabled and a discrete frequency element frequency ex-

ceeds (Discrete Sweep ModuLation) Tee chanqel B frequency

exceeds ihe kHz internal AV lrmit dcirir,g a discrete frequency sweep.

ments in memory are incom~atible with the mode selected.

(Phase OFfset) Cannot cfear phase offset of channel A.

138 (High Voltage) The high voltage (HV) option cannot be ena-

bled because the output frequency 1s qreater than

(CoRruPT) An error is detected in an instrument state

recalled from memory. The instrument state is replaced

impedance for the channel

MHz.

OverLoad) The channel B output

kHz rnternal Pm limit or exceeds tne 100

MoDe) The discrete frequency sweep ele-

MHz,

overloaded The load

output is too low or a volt-

AVCO 173 (channel A Voltage Controlled Oscillator) The channel A

voltaqe controlled oscrllator is unlocked

sensed, but the HP

MCAL

PCAL 191 (Phase CALibration) A phase calibration is unsuccessful

ACA

OCAL

PASS

FA1

192

193-1 94

(Mod~lation CAL~Dration) An internal AM or is ~nsuccessful.

(Amplitude CALibration) An amplitude call~ration is

successfu!. (Offset CALibration) A self test is successfvl. A self test is unsuccessful.

3326A cannot lock to it

dc offset calibration

calibration

unsuccessful

un-

Data Entry and Mod~f~cation

Viewing Setup Parameters

The current value of a setup parameter is displayed when a front panel key that accepts entries from the keypad (such as the FREQ or AMPTD key) is pressed. Figure

1-8

lists the front panel keys that accept entries from the keypad. Selecting one of these keys does not alter the current setup values. An error message is displayed if the key pressed is inactive for the mode selected. Pressing the CHAN key alternates the display between the channel A and B values for the parameter selected.

Units Conversion

The units keys, in addition to ending data entry, can perform units conversion on dis-

played values. Pressing a units key converts the value to the equivalent value for the units key pressed. For example, if the display value is in units key converts the display value to dBV. Converting units does not alter the current setup. The message "Error

results in a zero display value that is inconsistent with the current value. For example, converting 0.000001 units conversion.

dBm, pressing the dBV

CNVT" (CoNVerT) is displayed if the conversion would

MHz

would erroneously display 0

MHz,

Figure 1-1 1 illustrates

O/O

Figure

1-1

Units Conversion

Modifying Entry Values with the Rotary Knob

The display value can be modified with the rotary knob and keys in the MODIFY control group (see Figure key. When the modify rotary knob is enabled, flashing digit is the least significant digit that is modified with the rotary knob. Turning the rotary knob clockwise increments the value of the display, while turning the rotary

knob counterclockwise decrements the value of the display. The rotary knob modifies the display value until the boundary limit is reached. The rotary knob (and flashing digit)

is disabled with the

with the rotary knob.

1-1

2).

The rotary knob is enabled with either the arrow keys or ONIOFF

ONIOFF key. Figure

single digit in the display flashes. The

1-1

lists the display values that are modified

Data

Entry

and Mod~fication

The display digit modified with the rotary knob

selected with the right arrow and left arrow keys. Pressing the right arrow key selects the next least significant digit for modification and pressing the left arrow key selects the next most significant digit for modification.

HP-IB

Examples:

"MFY1

"MFY

ON"

Figure

1-12.

Modifying Entries with the Rotary

Knob

---

The

Entry

Keys

THE ENTRY KEYS

Frequency

The FREQ (frequency) key enables display, entry or modification of the frequency of the channel selected with the CHAN key. The indicator above the FREQ key illuminates when the output frequency value is displayed. The displayed frequency value is chang-

ed with the numeric keypad and units keys, or modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. Frequency resolution is 1

pHz for frequencies beleow 100 kHz, and 1 mHz for 100 kHz and above. Frequency ranges are dependent upon selection of the operating mode and high voltage option (see Figure 1-14). During a frequency change the output is phase continuous; that is, there are no phase discontinuities in the output waveform.

NOTE

After a mode change, the channel B frequency set to the channel A frequency.

2 Channel Mode

Each channel frequency is set independently. The frequency range for each channel

to 13 MHz.

2 Phase or Pulse Mode

The frequency of both channels is set to the same value by a change in frequency of

either channel. The frequency range is

to 13 MHz.

2 Tone Mode

The channel B frequency tracks changes to the channel A frequency. The frequency

range of channel A is 100 kHz offset from channel

A frequency change forces the channel

to 13 MHz. The channel B frequency can have up to a

with a maximum frequency of 13.1 MHz. If a channel

frequency to less than zero, the channel

frequency is changed to a value equal to the channel A frequency plus the absolute

value of the offset. The negative channel

value is displayed, and the channel B out-

put frequency is the absolute value of the displayed value.

The

Entry

Keys

The frequency range of channel A is 0 to is 0 to

Internal Amplitude Modulation

The frequency range of channel

HV Option

kHz.

I00 kHz.

A is

MHz.

The frequency range of channel

MHz.

The frequency range of channel

With the high voltage option enabled, the frequency output is 0 to

TONE

mode, the maximum channel B frequency is

HP-I6 Example:

NOTE

After a mode change, the channel B frequency is set to the channel

quency is set to greater than

high voltage option is disabled, To enable the high

voltage option, reduce the channel B frequency to

below

MHz.

frequency. If the channel 5 fre-

MHz,

MHz.

the channel

"FR7.500003MHZ"

MHz.

In the

The Entry Keys

Amplitude

The AMPTD (amplitude) key enables display, entry, or modification of the amplitude of the channel selected with the CHAN key. The indicator above the AMPTD key illuminates when an amplitude value is displayed. The displayed amplitude value is changed with the numeric keypad and units keys, or modified with the MODIFY controls. The VOLTS, Vrms, The amplitude range without dc offset is from

mV peak-to-peak to 40 V peak-to-peak with high voltage enabled). The amplitude range

dBm, and dBV units allow convenient entry of amplitude values.

mV peak-to-peak to

V peak-to-peak

is dependent upon selection of COMBINED operation, internal modulation, dc offset, and high voltage option (see Figure

1-1

5).

The output signal is momentarily set at zero

volts if internal attenuator settings change.

Internal Modulation

With internal modulation, the channel B amplitude is controlled by the % AMlPM DEV key. Internal modulation uses the channel B output internally and a signal is unavailable at the CH B connector.

High

Voltage Option

With the high voltage option, the upper amplitude limit is increased to 40 volts peak-to-

peak and the lower amplitude limit is increased to output needs to be enabled prior to entering voltage values greater than

Combined

mV peak-to-peak. The high voltage

volts.

For COMBINED operation, the output of channel B is diverted and summed with the

(6.02

channel A output. The amplitude limit of each channel is reduced by 50%

The upper amplitude limit for COMBINED operation is

volts

20 volts with the

dB).

high voltage option enabled). Note that the output amplitude level is dependent upon phase, frequency, and amplitude values.

The Entry Keys

Offset

The limit for an ac output with a dc offset is

1-1

high voltage option enabled). Figure

HP-IB

Example

"AM1

.125VOH

illustrates dc offset versus amplitude.

volts peak

volts peak with the

The

OFFSET

Entry

Keys

Offset

The DC OFFSET key enables display, entry, or modification of the dc offset of the channel

1-17).

selected with the CHAN key (see Figure key illuminates when a dc offset value is displayed. The displayed dc offset value is changed with the numeric keypad and VOLTS units key, or modified with the MODIFY controls. The maximum dc offset range is option enabled). The dc offset range is dependent upon amplitude, and selection of combined operation, internal modulation, and high voltage option. Figure

imum output of the nal attenuator settings change.

3326A.

The output signal is momentarily set at zero volts if inter-

The indicator above the DC OFFSET

volts

(-+

volts with the high voltage

1-1

lists the max-

STEP

The Entry Keys

with

Offset

The maximum dc offset is a function of the selected ac amplitude. The maximum am-

plitude for ac plus dc is versus amplitude (with combined operation, internal modulation, and high voltage option disabled) is illustrated in Figure 1-16. The maximum ac and dc outputs and maxi-

mum dc offsets for the

volts peak

3326A are:

20 with the high voltage option). DC offset

AC AMPLITUDE

1.0 to 10 Vpp

0.1

to 1.0 Vpp 10 to 100 mVpp 1 to 10 mvpp 55 mV t4.5 mV

Only

With the output FUNCTION set to DC, the output level is controlled by DC OFFSET entries. The maximum dc output is

Cornblned

For COMBINED operation with a sine wave, square wave, or OFF output FUNCTION

selected, the dc offset is set to zero.

High Voltage Option

With the high voltage option enabled, the dc offset range is + 20 volts (ac + dc peak value or dc only). DC offset with the high voltage option is independent of the ac amplitude except that the combination of ac plus dc cannot exceed

Internal Modulation

With internal modulation, the channel B dc offset is disabled.

HP-IB Example

MAXIMUM AC

5.0 V k4.5 V

0.5 V

50 mV

volts peak

DC MAXIMUM DC OFFSET

0.45 V

45 mV

20 with the high voltage option).

20 volts.

"OF3VO"

Phase

STEP

The PHASE key enables display, entry, or modification of the phase of the channel selected with the CHAN key. The indicator above the PHASE key illuminates when a phase value is displayed. The displayed phase value is changed with the numeric keypad and DEG display range is degrees entered through the keypad are accepted and the value is displayed modulo

720. The effect of the phase offset is dependent upon selection of the operating mode. Figure

(DEGrees) units key, or modified with the MODIFY controls. The phase

720 degrees with a resolution of 0.01 degrees. Phase values of

1-18

illustrates the effect of changing phase.

1440

Channel

Changing phase in the 2 CHANNEL mode changes the phase of a channel with respect to the initial waveform. The phase of channel A and

Phase Mode

Without an external phase reference, a change in the phase of channel A is made with

respect to the initial channel

in the phase of channel A is made with respect to the external reference. Channel uses channel A as the phase reference, and a change to the channel B phase is made with respect to the current channel A waveform.

Mode

are independent.

waveform. With an external phase reference, a change

The

Entry

Keys

Tone Mode

Changing phase in the 2 TONE mode changes the phase of a channel with respect to

the initial waveform. The phase of channel A and

are independent.

Pulse Mode

A change in the phase of channel A is made with respect to the initial channel A wave-

form. The channel to display the channel

output is the complement of the channel A output. An attempt

phase results in the display of the "Error

INTR" (INTeR-

rogate) message.

Asgn

Clr

Zero

Offset

The ASGN ZERO 4 (ASSIGN ZERO phase) key asslgns zero to the phase offset between

channel A and ing the phase of the output waveforms The ASGN ZERO the blue SHIFT key prior to the PHASE key phase value summed modulo

assignments

The stored phase offset value

offset) indicator illuminates when a phase offset value

(or between channel A and an external phase reference) wlthout chang-

key

selected by pressmg

channel A

changed to zero If channel B is selected, the phase offset value

720

and stored in an internal phase offset regrster

of zero phase sums the

displayed

recalled with the

phase value into the phase offset register

CLR

selected, the channel A

Subsequent

OFS key The OFS (phase

stored

HP-IS Example

"ZPH"

The CLR p OFS (CLeaR phase OFfSet) key restores the channel B phase offset value to the display without chang~ng the phase of the output waveforms. If the current channel

phase value is nonzero, the phase offset is summed to the phase value modulo

720

The CLR 4 OFS key is selected by pressing the blue SHIFT key prior to the

OFFSET key The CLR 4 OFS key extinguishes the 4 OFS indicator Pressing the CLR

OFS key with channel A selected displays the message "Error 120 P OF" (Phase

OFfset).

HP-IB Example

"COF"

The

Duty

Entrv

Cycle

iL:

(~~

Keys

(Pulse

Width)

The DUTY CYCLE key enables display, entry, or modification of the duty cycle of the

pulse mode channel

waveform. The DUTY CYCLE key is selected by pressing the blue SHIFT key prior to the FREQ key. The DUTY CYCLE indicator illuminates when the duty cycle value is displayed. After selection of the DUTY CYCLE key, the duty cycle

value is changed with the numeric keypad and controls. The duty cycle range is from 1

width of 20 nanoseconds. The resolution of the duty cycle is 0.01

O/O

units key, or modified with the MODIFY

O/O

to 99% of the period with a minimum pulse

O/O.

The duty cycle

remains constant for changes in frequency provided the pulse width is greater than

20 nanoseconds. Figure 1-19 illustrates the effect on changes in duty cycle.

HP-IS

Example

STEP

Linear Frequency Sweep

LINEAR FREQUENCY

Linear sweeps are phase continuous over the full frequency range; that is, there are no phase discontinuities in the swept output waveform. Single or continuous (see Figure

-20),

and ramp or triangle (see Figure 1-21) linear sweeps are selectable. Linear sweep

parameters are entered with the START FREQ (START FREQuency), STOP FREQ (STOP

FREQuency), CNTR FREQ (CeNTeR FREQuency), SPAN, TIME, AND MKR-CF keys. The MKR FREQ (MarKeR FREQuency) key allows the rear panel TTL level MARKER OUT (MARKER OUTput) signal to be specified.

SWEEP

Single Sweep

Sweep

The SINGLE key initiates a single linear sweep. The indicator above the SINGLE key

illuminates when a single sweep is in progress. With a ramp sweep selected (i.e. TRIANGLE indicator extinguished), the SINGLE key initiates a sweep from the start frequency to the stop frequency over the specified sweep time. Upon reaching the stop frequency, the frequency is quickly changed to the start frequency. With a TRIANGLE sweep selected, the SINGLE key initiates a sweep from the start frequency to the stop frequency over the specified sweep time. The stop frequency is maintained until the SINGLE key is pressed. Pressing the SINGLE key initiates another sweep from the stop frequency to the start frequency.

HP-IB Example:

Continuous Sweep

The CONT (CONTinuous) key initiates a continuous linear sweep. The indicator above the CONT key illuminates when a continuous sweep is in progress. With a ramp sweep

selected (i.e. TRIANGLE indicator extinguished), the CONT key initiates sweep from the start frequency to the stop frequency over the specified sweep time. Upon reaching the stop frequency, the frequency is quickly changed to the start fre-

quency in preparation for the next sweep. With a TRIANGLE sweep selected, the CONT

key initiates a repetitive sweep from the start frequency to the stop frequency and back

to the start frequency. Each sweep (from either the start frequency to stop frequency,

or from stop frequency to start frequency) is over the specified sweep time.

HP-16 Example:

"SS"

"SC"

repetitive

Linear Frequency Sweep

Start Frequency

START

The START FREQ (START FREQuency) key enables display, entry, or modification of the linear sweep start frequency of the channel selected with the CHAN key. The indicator above the START FREQ key illuminates when a start frequency value is displayed. The displayed frequency value is changed with the numeric keypad and units keys, or

modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. Frequency resolution is

pHz for frequencies below 100 kHz and 1 mHz for frequencies above 100 kHz. Start frequency values may be greater than the stop frequency values for a sweep from a high frequency to a low frequency.

Channel Mode

Each channel start frequency is set independently. The frequency range of each chan-

nel is 0 to 13 MHz.

Phase or Pulse Mode

The start frequency of both channels is set to the same value by a change in start fre-

quency of either channel. The frequency range is 0 to 13 MHz.

Tone Mode

The channel B start frequency tracks changes to the channel A start frequency. The

channel

have up to a 100 kHz offset from channel

a channel A frequency change forces the channel B frequency to less than zero, the

channel

start frequency range is 0 to 13 MHz. The channel B start frequency can

with a maximum frequency of 13.1 MHz.

frequency is displayed as a negative value while the channel B output fre-

quency is the absolute value of the displayed value.

Internal Phase Modulation

The start frequency range of channel A is 0 to 13 MHz. The start frequency range of

channel

Internal Amplitude Modulation

is 0 to 5 kHz.

The start frequency range of channel A is 0 to 13 MHz. The start frequency range of channel

HV Option

is 0 to 100 kHz.

With the high voltage option enabled, the start frequency range is 0 to 1 MHz. In the 2 TONE mode, the maximum channel

HP-16 Example:

start frequency is 1.1 MHz.

"ST1.512525KHZ"

Linear Frequency

Sweep

The STOP FREQ (STOP FREQuency) key enables display, entry, or modification of the

linear sweep stop frequency of the channel selected with the CHAN key. The indicator above the STOP FREQ key illuminates when

stop frequency value is displayed. The displayed frequency value is changed with the numeric keypad and units keys, or modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. Frequency resolution is 1 pHz for frequencies below 100 kHz and

1 mHz for frequencies above 100 kHz.

Channel Mode

Each channel stop frequency is set independently. The frequency range of each channel is 0 to 13 MHz.

Phase or Pulse Mode

The stop frequency of both channels is set to the same value by a change in stop fre-

quency of either channel. The frequency range is 0 to 13 MHz.

Tone Mode

The channel B stop frequency tracks changes to the channel A stop frequency. The

stop frequency range of channel A is 0 to 13 MHz. The channel

stop frequency can

have up to a 100 kHz offset from channel A, wit'h a maximum frequency of 13.1 MHz.

If a channel A frequency change forces the channel

channel

frequency is changed to a value equal to the channel A frequency plus the

frequency to less than zero, the

absolute value of the offset.

Internal Phase Modulation

The stop frequency range of channel A is 0 to 13 MHz. The stop frequency range of channel

Internal Amplitude Modulation

is 0 to 5 kHz.

The stop frequency range of channel A is 0 to 13 MHz. The stop frequency range of channel

Option

is 0 to 100 kHz.

With the high voltage option enabled, the stop frequency range is 0 to 1 MHz. In the

TONE mode, the maximum channel B frequency is 1.1 MHz.

HP-16 Example:

"SP7.512525KHZ"

Linear

Time

Frequency

Sweep

The TlME key enables display, entry, or modification of the linear sweep time for both

channels. The indicator above the TIME key illuminates when a time value is displayed.

The displayed time value is changed with the numeric keypad and units keys, or modi-

fied with the MODIFY controls. The SEC and mSEC units keys end entry of numeric

1000

values. The time range is 5 milliseconds to

seconds, with a resolution of 1 mil-

lisecond.

HP-IB Example:

"ST1 M25MS"

Marker Frequency

The MKR FREQ (MarKeR FREQuency) key enables display, entry, or modification of the marker frequency of the channel selected with the CHAN key. The indicator above the MKR FREQ key illuminates when the marker frequency value is displayed. The dis-

played frequency value is changed with the numeric keypad and units keys, or modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. Frequency resolution is 1 mHz for frequencies above 100 kHz. Only one marker is available.

For a marker signal to be generated, the MKR FREQ must be within 3 milliseconds of the start or stop frequency. The following equation may be used to determine the approximate marker offset from the start or stop frequency:

pHz for frequencies below 100 kHz and

NOTE

When different start or stop frequencies are entered

for each channel, selecting alternate channels can

have the apparent effect of changing the marker

frequency, Although the marker occurs at the same time, each channel may have a unique frequency

at that time.

MARKER OFFSET

0.003

SPAN

SWEEP TlME

The marker value is accepted and the message "Error 24 RNGE" is displayed if the

marker value is outside the sweep frequency span. The Z-BLANK output is coincident with the start and stop frequencies and may be used for the marker of these frequencies.

HP-1B Example:

Triangle

Linear Frequency Sweep

The TRIANGLE key selects either a triangle or ramp sweep. The TRIANGLE key is

selected by pressing the blue SHIFT key prior to the MKR FREQ key. The TRIANGLE indicator is illuminated when a triangle sweep is selected, and extinguished when a

ramp sweep is selected.

HP-If3

Examples:

"SMI

"SM2" or or "SM RAMP" "SM TRGL"

STEP

L~near

Frequency

Sweep

Reset

Span

Sweep

The RESET SWP (RESET SWeeP) key resets the sweep circuits to the start of the sweep.

During reset, the HP 3326A also checks the sweep limits.

HP-I6 Example:

"SRE"

The SPAN key enables display, entry, or modification of the total linear sweep frequency

span of the channel selected with the CHAN key. The SPAN key is available by pressing the blue SHIFT key prior to pressing the STOP FREQ (STOP FREQuency) key. The SPAN key, with the CNTR FREQ (CeNTeR FREQuency) key, provides an alternate entry for the frequency sweep start and stop values. The SPAN indicator illuminates when SPAN is selected and the SPAN value is displayed. The displayed frequency span value is changed with the numeric keypad and units keys, or modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. Frequency resolution is 1

pHz for frequencies below 100 kHz and 1 mHz for frequencies above

100 kHz.

NOTE

Frequency spans must be consistent with the operating limits and the value entered for the center frequenc y. Excessive frequency spans are s ymmetrica//y reduced around the current center frequency to bring the start or stop frequencies within limits.

Channel Mode

The frequency span of each channel is set independently. The frequency range of each channel is 0 to 13 MHz,

Phase

Pulse Mode

The frequency span of both channels is set to the same value by a change in the fre-

quency span of either channel. The frequency range is

Tone Mode

to 13 MHz.

The frequency span range for channel A is 0 to 13 MHz. Changing the channel A frequency span also changes the channel current start and stop frequency offsets. The channel

center frequency and span to maintain the

frequency span may be set

so that the start and stop frequencies are within 100 kHz of the channel A start and

stop frequencies. If a channel A frequency change forces the channel

less than zero, the channel

channel

frequency.

output frequency is changed to the absolute value of the

frequency to

HV Option

Linear Frequency

NOTE

The difference (offset) between the channelA and

frequencies will normally change during a sweep to maintain the offsets entered for the sweep start and stop frequencies. If a constant offset is desired, there must be a constant offset between the start and stop frequency values for channel

and

Sweep

With the high voltage option enabled, the maximum frequency span is 1 MHz. In the

TONE

mode, the maximum channel B frequency span is 1.1 MHz.

HP-IB Example:

Center Frequency

The CNTR FREQ (CeNTeR FREQuency) key enables display, entry, or modification of

the linear sweep center frequency of the channel selected with the CHAN key. The CNTR FREQ key is available by pressing the blue SHIFT key prior to the START FREQ key. The CNTR FREQ key, along with the SPAN key, provides an alternate entry of the frequency sweep start and stop values.

The displayed frequency value is changed with the numeric keypad and units keys, or

modified with the MODIFY controls. The MHz, kHz, and Hz units allow convenient entry of frequency values. The frequency resolution is 1 and 1 mHz for frequencies above 100 kHz. If the center frequency causes the sweep start or stop frequency to exceed the HP

Channel Mode

The center frequency of each channel is set independently. The frequency range of each channel is 0 to 13 MHz.

Phase or Pulse

The center frequency of both channels is set to the same value by a change in center frequency of either channel. The frequency range is 0 to 13 MHz.

pHz for frequencies below 100 kHz

3326A limits, the frequency span is reduced,

Tone Mode

The channel A center frequency has the range of 0 to 13 MHz. The start and stop frequencies of channel maintain the current offset. The channel offset from channel

100 kHz of the channel

HP-IS Example:

tracks changes to the channel A start and stop frequencies to

center frequency can have up to a 100 kHz

providing the channel B start and stop frequencies are within

start and stop frequencies.

"CF5.512525KHZ"

L~near Frequency Sweep

Marker to Center Frequency

The MKR

quency set for the marker, The MKR key prior to the quency limits, the frequency band is reduced.

Channel Mode

The center frequency of each channel is set independently. The frequency range of each channel is

Phase or Pulse Mode

The center frequency of both channels is set to the same value by a change in the

center frequency of either channel. The frequency range is 0 to 13 MHz.

Tone Mode

The channel A center frequency has the range of 0 to 13 MHz. The start and stop frequencies of channel maintain the current offset. The channel offset from channel 100 kHz of the channel

HP-IB

CF (MarKeR to Center Frequency) key centers the sweep band on the fre-

CF key is selected by pressing the blue SHIFT

CONT

Example:

key. If either the sweep start or stop frequency exceeds the fre-

to 13 MHz.

tracks changes to the channel A start and stop frequencies to

center frequency can have up to a 100 kHz

providing the channel B start and stop frequencies are within

start and stop frequencies.

"CFM"

DISCRETE FREQUENCY SWEEP

D~screte Frequency Swee~

Discrete

Recall

Discrete

During a discrete frequency sweep, the HP 3326A sequences through the discrete frequency sweep elements (channel volatile memory with the SAVE DISCRETE key (see Figure 1-22). Discrete frequency sweep element frequencies are entered with the FREQ times are entered with the TlME key. The HP 3326A always sequences through the discrete frequency sweep elements from element SINGLE sweep selected, the HP 3326A sequences through the elements each time the SINGLE key is pressed. With CONT sweep selected, the HP through the elements continuously. The message "Error 11 SWeeP) is displayed if no discrete frequency sweep elements are stored in memory. Selecting TRIANGLE for a discrete frequency sweep cancels the discrete frequency sweep and selects a linear sweep.

The DISCRETE key enables and disables discrete frequency sweeps. The DISCRETE

key is available by pressing the blue SHIFT key prior DISCRETE indicator illuminates when discrete frequency sweeps are enabled.

HP-IB

Examples:

"SM3"

"SM DSCR"

and B frequencies, and dwell time) stored in non-

(FREQuency) key, and dwell

to the last element entered. With

3326A sequences

DSWP" (Discrete frequency

pressing the TlME key. The

The RCL DISCRETE (ReCaLI DISCRETE) key followed by a discrete element number

replaces the channel for a d~screte frequency sweep element The RCL DISCRETE key 1s avadable by pressing the blue SHIFT key prlor to pressing the RECALL key. Val~d discrete elements numbers range from d~splays the message "Error

HP-IB

Example:

and B frequency values and time values with the values stored

to 62. Recalling a null discrete frequency sweep element number

RNGE

Discrete Frequency

Save

Discrete

The SAVE DISCRETE key followed by a dlscrete frequency sweep element number stores the current channel A and memory The SAVE DISCRETE key is available by pressing the blue SHIFT key prlor to pressing the SAVE key Vahd discrete frequency sweep element numbers range from 00 bers must start with be recalled, ed~ted, and replaced in any order Stormg a discrete frequency sweep ele-

ment wlth a sage "Error 23 RNGE" (RaNGE) The message "Error SWeeP) is displayed ~f a d~screte frequency element

changed.

Sweep

frequency values and dwell t~me value In nonvolatile

to 62. When initially entering discrete frequency sweep elements, the element num-

and be sequential Exlst~ng discrete frequency elements may

nonsequential

number, or using a number greater than 62 displays the mes-

DSWP" (Discrete frequency

entered after the mode

Discrete frequency sweep element storage uses the same nonvolatile memory as the

SAVE key stores. Discrete sweep frequency storage memory is assigned by the

3326A. Discrete frequency sweep elements are stored in the following memory

registers:

DISCRETE FREQUENCY

ELEMENT

NUMBER

00 - 06

56 - 62

MEMORY

8 7

5 4 3 2

Saving an operating state in a memory register that interrupts the contiguous memory

used to save discrete frequency sweep elements displays the "Error 23 RNGE" (RaNGE) message. Saving an operating state in the lowest memory register occupied by dis-

crete frequency sweep elements reclaims that memory register for operating state

storage.

HP-IS

Example:

Single Sweep

The SINGLE key initiates a single discrete frequency sweep. The indicator above the SINGLE key illuminates when a single sweep is in progress. The SINGLE key initiates a sweep from the discrete frequency sweep element 00 to the last entered element.

During a sweep, the SINGLE key causes the HP

crete frequency sweep element to the next discrete frequency sweep element.

HP-IB Example:

Continuous Sweep

"SS"

Discrete Frequency

3326A to step from the current dis-

Sweep

Clear Discrete

Time

The CONT (continuous) key initiates a continuous discrete frequency sweep. The indi-

cator above the CONT key illuminates when

HP-IB Example:

"SC"

The CLR DISCRETE (CLeaR DISCRETE) key replaces the discrete frequency sweep elements stored in nonvolatile memory with the preset operating state. The CLR

DISCRETE key is available by pressing the blue PRESET key,

HP-IB Example:

"DRST"

The TIME key enables display, entry, or modification of the discrete frequency sweep

element dwell time for both channels. After selection of the TIME key, the time value is changed with the numeric keypad and units trols. The SEC and from

milliseconds to 1000 seconds with a resolution of 1 millisecond.

HP-IB Example:

mSEC units keys end entry of numeric values. The time range is

continuous sweep is in progress.

SHIFT key prior to the green INSTR

keys! or modified with the MODIFY con-

Reset Sweep

"STIM25MS"

The RESET SWP (reset sweep) key resets the sweep circuits to the start of the sweep.

For triggered operation, manually resetting the sweep circuits before the trigger minimizes the delay between the trigger and start of sweep.

HP-IB Example:

"SRE"

Discrete Frequency Sweep

STEP

Flgure

1-22.

Discrete Frequency

Sweep

Modulation

The keys in the MODULATION key block enable and disable modulation. Each time a

modulation key is pressed, the modulation indicators sequence through the available selections. Available modulation selections are dependent on the mode. Figure

1-24

lists the types of modulation available for the operating modes. If a modulation type

is unavailable, check the mode of operation, channel

frequency, and COMBINED operation. Modulation is disabled by pressing each of the MODULATION selection keys and extinguishing all of the MODULATION indicators, by changing the mode, or by presetting the HP

3326A. Figure 1-23 illustrates modulation definition. Figures 1-25 and 1-26

illustrates the effect of internal AM and PM modulation.

Modulation

lnternal

AM1 %AM

Internal amplitude modulation is enabled in the 2 CHANNEL mode when the channel

A INT AM (INternal Amplitude Modulation) indicator is illuminated. lnternal amplitude

modulation uses the channel

synthesizer as the modulation source for channel A, thus only the channel A output is active. For internal amplitude modulation, 100 kHz is the maximum channel

frequency, lnternal amplitude modulation limits the values

entered for the channel A amplitude to 50% (6.02 dB) of the normal range. When internal modulation is selected, the channel

high voltage option is disabled.

If internal modulation cannot be selected (i.e. the INT AM indicator does not illuminate),

check that the

CHANNEL mode is selected, COMBINED operation is disabled, and

the channel B frequency is below 100 kHz.

HP-1%

Example:

"AIAl

"AIA ON"

Percent

The %AMIPM DEV (percent Amplitude ModulationlPhase Modulation DEViation) key

enables display, entry, or modification of the modulation percentage. The %AMIPM DEV key is selected by pressing the blue SHIFT key prior to the AMPTD key. The

%AMIPM DEV indicator illuminates when the modulation value is displayed. After selec-

tion of the %AM/PM DEV key, the modulation value is entered or modified with the

O/O

numeric keypad and tion value ranges from 0 to 100% with 0.1

units key, or modified with the MODIFY controls. The modula-

O/O

resolution. With 0% amplitude modulation, the channel A output level is equal to the amplitude entered for the AMPTD key. The modulation value is used for both AM and PM. If the displayed modulation value

is in degrees, pressing the

larly:

the displayed value is in degrees, pressing the DEG units key converts the dis-

units key converts the displayed value to percent. Simi-

played value to degrees.

HP-1%

Example:

Modulation

STEP

internal

''uo

PMlPM

DEV

Internal phase modulation is enabled in the 2 CHANNEL mode when the channel A INT PM (internal Phase Modulation) indicator is illuminated (see Figure 1-26). Internal phase modulation uses the channel B synthesizer as the modulation source for channel A.

Thus, only the channel

maximum channel B frequency.

When internal modulation is selected, the channel

internal modulation cannot be selected (i.e. the INT

check that the the channel B frequency is below

HP-IS

Example:

CHANNEL mode is selected, COMBINED operation is disabled, and

"AIPI or "AIP ON"

output is active. For internal phase modulation, 5 kHz is the

high voltage option is disabled.

indicator does not illuminate),

kHz.

ZGrnv;;

STEP

The %AMIPM DEV (percent Amplitude ModulationIPhase Modulation DEViation) key

enables display, entry, or modification of the phase modulation deviation. The %AM/PM DEV key is selected by pressing the blue SHIFT key prior to the AMPTD key. The

%AM/PM DEV indicator illuminates when the phase modulation deviation value is dis-

played. After selection of the O/oAM/PM DEV key, the phase modulation deviation is en-

tered or modified with the numeric keypad and DEG units key, or modified with the

MODIFY controls. The phase modulation deviation ranges from

360"

with

0.01"

resolution. The modulation value is used for both AM and PM. If the displayed modula-

O/O

tion value is in degrees, pressing the cent. Similarly, if the displayed value is

units key converts the displayed value to per-

degrees, pressing the DEG units key con-

verts the displayed value to degrees.

HP-IS

Example:

STEP

Modulation

External AM

Either channel is amplitude modulated by an external source through the rear panel

A-AMPTD MOD IN (channel AAMPliTuDe MODulation INput) or B-AMPTD MOD IN (chan-

nel B AMPliTuDe MODulation INput) connector when the respective channel EXT AM

(EXTernal Amplitude Modulation) indicator is illuminated. The voltage range for the

A-AMPTD MOD IN or B-AMPTD MOD IN connector is

input results in 100% modulation. A 0 volt input results in an output equal to the ampli-

tude entered for the AMPTD key. For channel A, a

level. For channel B, a tude modulation frequency into the HP 3326A is 100 kHz. Amplitude modulation limits the values entered for the channel A amplitude to 50% (6.02 dB) of the normal range.

1 volt input results in a minimum level. The maximum ampli-

1.0 volt. A 2 volt peak-to-peak

1 volt input results in a minimum

HP-16 Example:

External PM and Sync PM

External phase modulation is enabled when the EXT PM (EXTernal Phase Modulation) or (AB) SYNC PM (channel

nated. Channel A is phase modulated by an external source through the rear panel A-PHASE MOD INlSYNC PM IN (channel A PHASE MODulation INput/SYNChronous

Phase Modulation INput) connector when the channel A EXT PM or (AB) SYNC PM indi-

cator is illuminated. For synchronous phase modulation, channel B phase is held constant relative to the channel A phase. Channel B is phase modulated by an external source through the rear panel B-PHASE MOD IN (channel B PHASE MODulation INput) con-

nector when the channel B EXT PM indicator is illuminated. The voltage range for the A-PHASE MOD INISYNC PM IN or B-PHASE MOD IN connector is

responds to

lation. The maximum frequency into the HP 3326A for phase modulation is

modulation selection is dependent on the mode selected (see Figure 1-23).

Channel Mode

'AEAI or "AEA ON" "BEAI

"BEA ON"

360" phase modulation. A 0 volt input results in an output with 0' modu-

and B SYNChronous Phase Modulation) indicator is illumi-

volt which cor-

kHz. Phase

Channel A is phase modulated by an external source through the rear panel A-PHASE

MOD INISYNC PM IN connector when the channel A EXT PM indicator is illuminated. Channel B is phase modulated by an external source through the rear panel B-PHASE

MOD IN connector when the channel B EXT PM indicator is illuminated.

Modulation

Phase, 2 Tone, or Pulse Mode

Both channels are synchronously phase modulated by an external source through the

rear panel A-PHASE MOD INISYNC PM IN connector when the (AB) SYNC PM indicator is illuminated. Channel the rear panel B-PHASE MOD IN connector when the channel

is also phase modulated by an external source through

EXT

PM indicator is

illuminated.

HP-IB Example:

"AEPI

"AEP ON"

"BEPI

"BEP ON"

"SPEI

"SPE ON"

Disabling Modulation

Modulation is disabled by pressing the MODULATION selection keys corresponding to an illuminated indicator until all the indicators are extinguished. Modulation is also disabled by changing the mode with the MODE key or presetting the HP

HP-IB Example:

3326A.

"NOM"

SavingIRecalling an Instrument

State

SAVINGIRECALLING AN INSTRUMENT STATE, AND MEMORY OPERATIONS

Save

Recall

The SAVE key, followed by a digit from 0 to

saves the current operating state in nonvolatile memory. The digit following the SAVE key specifies the memory register for storing the operating state. If two operating states are saved in the same memory

is a valid entry for a memory register, the contents of this memory register are replaced with the current operating state when power is removed from the

3326A.

Saving an operating state in a memory register that interrupts contiguous memory used

by discrete frequency sweep elements displays the "Error 23 RNGE" (RaNGE) message. Saving an operating state in the lowest memory register occupied by discrete frequency sweep elements reclaims that memory register for operating state storage.

HP-16 Example:

The RECALL key, followed by a digit from 0 to

nonvolatile memory. The digits

to 9 select the memory register for the recall opera-

recalls an operating state saved in

tion. Recalling a memory register with discrete frequency sweep elements generates

the "Error

HP-I6 Example:

RNGE" (RaNGE) error message.

"RCL3"

Memory register 0 contains the last operating state prior to removing power. The last operating state established prior to removing power is restored by pressing the RECALL key followed by the digit

Through the use of the internal SAVE switch, the setup state stored in register 0 can be selected as the turn on state. Setting of internal switches must be done by qualified service personnel. The location and settings of the SAVE switch are described in the

Memory Clear

Recall Discrete

The RCL DISCRETE (ReCaLI DISCRETE) key followed by a discrete frequency sweep element number replaces the channel A and the values stored for the discrete frequency sweep element. The RCL DISCRETE key

discrete frequency sweep elements numbers range from crete frequency sweep element displays the message "Error 20 RNGE" (RaNGE).

3326A Service Manual.

Applying power to the HP 3326A with the blue SHIFT key pressed replaces the contents of all nonvolatile memory registers with the INSTR PRESET state. All saved oper-

ating states and discrete frequency sweep elements are replaced with the PRESET state.

frequency values and time value w~th

ava~lable by pressing the blue SHIFT key prlor to pressing the RECALL key. Valid

to 62 Recalling a null dis-

INSTR

Save Discrete

HP-IB

Example:

The SAVE DISCRETE key followed by a discrete frequency sweep element number stores the current channel A and memory. The SAVE DISCRETE key is available by pressing the blue SHIFT key prior to pressing the SAVE key. Valid discrete frequency sweep element numbers range from

62.

00 to bers must start with 00 and be sequential. Existing discrete frequency elements may be recalled, edited, and replaced in any order. Storing a discrete frequency sweep ele-

ment with a nonsequential number, or using a number greater than 62 displays the message "Error 23 RNGE" (RaNGE). The message "Error SWeeP) is displayed changed.

When initially entering discrete frequency sweep elements, the element num-

frequency values and dwell time value in nonvolatile

DSWP" (Discrete frequency

a discrete frequency element is entered after the mode is

SavlnglRecall~ng an lnstrument State

Discrete frequency sweep element storage uses the same nonvolatile memory as a SAVE operation starting with memory register are stored in the following memory registers:

DISCRETE FREQUENCY ELEMENT NUMBER

00 - 06 07-

48 49 - 55 56

MEMORY REGISTER

5 4

Discrete frequency sweep elements

Saving an operating state in a memory register that interrupts the contiguous memory used to save discrete frequency sweep elements displays the "Error 23 RNGE" (RaNGE)

message. Saving an operating state in the lowest memory register occupied by discrete frequency sweep elements reclaims that memory register for operating state storage.

HP-IB Example:

Clear Discrete

The CLR DISCRETE (CLeaR DISCRETE) key erases all discrete frequency sweep

elements stored in nonvolatile memory and replaces the states with the preset state.

The CLR DISCRETE key is available by pressing the blue SHIFT key prior to the green

INSTR PRESET key.

HP-IB Example:

lnstrument Preset

The HP 3326A is restored to the preset state by pressing the green INSTR PRESET

(INSTRument PRESET) key in the INSTR STATE (INSTRument STATE) key group. INSTR

PRESET provides a convenient state for establishing an instrument setup, and does not destroy any instrument states stored in nonvolatile memory. The preset state is

listed in Figure

"DCLR"

1-1.

HP-IS Example:

"RST"

CALlBRATlON AND SELF TEST

Calibration

and

Self

Test

Selecting a Calibration

The SELECT key selects the phase calibration source or type. Each time the SELECT

key is pressed, the calibration indicators sequence through the INTERNAL, EXTERNAL, and MULTIPHASE selections. A calibration is initiated with the MANUAL key.

Internal Calibration

With internal calibration selected as the calibration source, the HP 3326A phase, am-

plitude, dc offset, and internal modulation is calibrated with internal references.

HP-18

Examples:

Mode

"CMDI

"CMD INT"

Cahbrat~on and

A-EYT

CAL

ii-10

VOOI

8-EXT

4 CA'i

IMULTI

REF

i!~,O

VPP,

Self

Test

External Calibration

In the 2 PHASE mode, external calibration enables the HP 3326A to sense phase at

an external reference point and calibrates the channel B phase with respect to chan-

nel A phase. Phase is sensed through the rear panel A-EXT INIMULTI

REF IN connectors. The external calibration inputs require an input range

CAL IN and B-EXT 4 CAL

from 3 to 10 volts peak-to-peak over the frequency range of 1 kHz to 13.1 MHz. Figure

1-27 illustrates a typical external phase calibration circuit. Amplitude, dc offset, and

lV4

internal modulation are calibrated with internal references.

HP-IB

Example:

"CMD2" or "CMD EXT"

A-E~T~CALIN

11-10

VPPl

~EKT~CALI~

llMULTi

REF

(1-$0

VPPi

Calibrat~on and

Self

Test

tion enables the HP 3326A to maintain a

xternal reference. The phase relationship between channel A and the external reference of the same frequency is sensed through the rear panel A-EXT calibrating channel A phase to the external reference, channel

CAL IN and B-EXT 4 CAL INIMULTI 4 REF IN connectors. After

phase is internally calibrated to channel A phase. The external calibration inputs require an input range from 3 to 10 volts peak-to-peak over the frequency range of 1 kHz to

13.1

MHz. Figure 1-28 illustrates a typical multiphase calibration circuit. Amplitude, dc offset, and internal modulation are calibrated with internal references.

HP-IB

Example:

"CMD3" or "CMD MULT"

Calibration

and

Self Test

Manual

The MANUAL key initiates a calibration each time the key is pressed. Amplitude and dc offset for the selected function: internal AM and PM (if selected), and phase (for 2 PHASE or PULSE mode) are calibrated during a manual calibration. Figure 1-29 lists other events that initiate a calibration.

HP-IB Example:

Automatic Calibration

An automatic calibration cycle is enabled by pressing the blue SHIFT key prior to the MANUAL key. The AUTO indicator illuminates when automatic calibration is enabled. When automatic calibration is enabled, a calibration occurs immediately after enabling automatic calibration, 5 minutes after power is applied, 15 minutes after power is ap-

plied, and at 30 minute intervals thereafter. Figure 1-29 lists the calibrations performed by the HP 3326A and the events that initiate calibration.

"CAL"

HP-IB Example:

"ACALI or

"ACAL ON"

Self

Test

HP-IB

Status

A self test is initiated by pressing the blue SHIFT key prior to the SELECT key. During a self test, all indicators and display segments briefly illuminate, and a series of inter-

nal tests is initiated. After each internal test, PASS or FAIL followed by a test number is displayed to indicate the test results. During a self test, the outputs are disabled.

HP-IB

Example:

THE HP-IB

STATUS

KEYSIINDICATORSICONNECTOR

The HP-IB (Hewlett-Packard Interface Bus) Status keys and indicators are used during

remote operation. An overview of the HP-IB and a description of the HP 3326A HP-IB characteristics is in Chapter II. Chapter Ill describes the to remote operation and contains a complete list of the HP-IB commands.

3326A commands unique

HP-IB Status

Local

The LOCAL key removes the HP 3326A from remote (HP-IB) operation if local lockout

is not in effect and the display is not disabled. Remote operation is indicated by the illuminated REMOTE indicator.

NOTE

If "dISP OFF" (DISPlay OFF) is displayed on the

3326A,

HP DISP OFF NP-IB command. To return the HP

to normal, use the DISP ON HP-IB command or

apply power with the blue SHIFT memory clear operation).

the display has been disabled by the

3326A

ke y depressed (a

Bus

Address

The REMOTE indicator illuminates when the HP 3326A is operating under HP-IB control. While in remote (and local lockout is not in effect), only the LOCAL key is recognized.

The LISTEN indicator illuminates when the HP 3326A is addressed to listen over the

HP-16. The TALK indicator illuminates when the HP 3326A is addressed to talk over the HP-IB. The SRQ (Service

ReQuest) indicator illuminates when the HP 3326A is generating an

HP-IB service request.

NOTE

SRQ may be generated while the

in local if the status byte mask used to enable an

SRQ is not reset. To extinguish the front panel SRQ indicator, set the SRQ mask to zero and perform a serial poll with a controller, or apply po wer with

the blue SHIFT key depressed fa memory clear

operation). For more information on the status byte

mask, refer to "Reading and Masking the Status

Byte" in chapter

Ill.

3326A

The BUS ADRS (BUS ADdReSs) key enables display or entry of the HP-IB address. The

BUS ADRS key is selected by pressing the blue SHIFT key prior to the LOCAL key. After selection of the BUS ADRS key, the HP-IB address is entered with the numeric keypad. For two digit HP-IB addresses, the address is set when the second digit is entered. For single digit HP-IB addresses, the address is set when any units key is pressed. Alternately, a zero can precede the single digit to form a two digit address. The HP-IB address is an integer in the range of

and is retained in nonvolatile memory.

The HP 3326A is connected to other HP-IB devices through the rear panel HP-IB connector,

EXTERNAL TRIGGER

External Trigger

EXT

TRlG

From the preset state, EXT TRlG IN (EXTernal TRlGger INput) is used to trigger single frequency sweeps. Triggered operation is initiated by a negative edge transition of a TTL level signal after the sweep is reset. Triggers received during a sweep reset are

ignored. The shortest delay between a trigger and sweep start is when the sweep is reset prior to the trigger. The trigger functions are extended through the use of HP-IB

commands described in "Triggered Sweeps" and "Modifying Parameters" in Chapter

Ill. To inhibit inadvertently triggered sweeps, remove the trigger signal from the EXT TRlG IN connector, or disable triggered operation with the TOFF (Trigger OFF) HP-IB command.

MARKER 1 Z-BLANK (PEN LIFT) I X-DRIVE OUTPUTS

The MARKER OUT, Z-BLANK OUT, and X-DRIVE OUT connectors provide outputs to

drive an analog plotter or oscilloscope display during sweep operation. Figure

OUT

lustrates the use of MARKER

to drive an oscilloscope. Figure

1-31

illustrates the

1-30

il-

oscilloscope connections used to obtain the display.

X-Drive

Outputs

Marker

MARKER

Out

OUT

The rear panel MARKER OUT connector provides a TTL level signal to indicate when the sweep frequency reaches the value entered for the marker frequency. The high to low transition in the channel change during a sweep.

Triangle Linear Sweep

When sweeping from the start at the selected marker frequency. When sweeping from the stop to the start frequency,

MARKER OUT rises to a high level at the selected marker frequency.

Ramp Linear Sweep

When sweeping from the start to the stop frequency, MARKER OUT drops low at the selected marker frequency.

Discrete Frequency Sweep

MARKER OUT drops low at the start of each frequency element and remains low until the end of the sweep element. MARKER OUT returns to a high level briefly minimum) during the transition between sweep elements.

trace in Figure

the stop frequency, MARKER OUT drops to a low level

3-30

illustrates the MARKER OUT level

+second

Marker 1 Z-Blank 1 X-Drlve

Outputs

The Z-BLANK OUTput drops low at the start of sweep and remains low until the end

of a sweep. At the end of a sweep, Z-BLANK OUT goes to a high level and remains high until another sweep segment is initiated. The Z-BLANK OUT connector is located on the rear panel and the output is ble of sinking current from a positive voltage source through a pen-lift circuit or other device. Figure cilloscope. When used as an input, the maximum Z-BLANK OUT ratings are:

Z-BLANK OUT drops low at the start of sweep and remains low until the end of a sweep. At the end of a sweep, the Z-BLANK OUT goes to a high level and remains high while the frequency is reset to 'the start frequency.

Triangle Linear

Z-BLANK OUT drops low during the sweep from the start frequency to the stop frequency, and during the sweep from the stop frequency to the start frequency. Z-BLANK OUT is high when the

Discrete Frequency Sweep

Z-BLANK OUT drops low at the start end of a sweep sequence. At the end of a sweep, Z-BLANK OUT goes to and remains high until another sweep is initiated.

1-32

illustrates a typical circuit for connecting Z-BLANK OUT to an os-

Maximum current sink: Allowable voltage range:

TTL compatible. The Z-BLANK OUT low level is capa-

100

3326A is not sweeping.

a sweep sequence and remains low until the

high level

Marker I Z-Blank1 X-Drive

Out~uts

X-Drive

X-DRIVE

'0.10

OUT

'1,':

Out

During sweep operation, the rear panel X-DRIVE OUT connector provides a 0 to 10 or

10 to 0 volt linear ramp proportional to the sweep time. Figure 1-30 illustrates a typical circuit that uses X-DRIVE OUT to control the horizontal deflection of the oscilloscope display.

Triangle Linear

X-DRIVE OUT increases from 0 to 10 volts for the sweep from the start frequency to

the stop frequency and decreases from 10 to 0 volts for the sweep from the stop fre-

quency to the start frequency.

Ramp Linear Sweep

X-DRIVE OUT increases from 0 to 10 volts for the sweep from the start frequency to

the stop frequency. At the end of a sweep the output is reset to 0 volts.

Discrete Frequency Sweep

Normally, X-DRIVE OUT increases linearly from 0 to 10 volts during the total sweep

time. If the total sweep time is between 1000 and 1024 seconds, X-DRIVE OUT increases

at the lowest sweep rate with a maximum output of 10.24 volts. If the sweep time exceeds 1024 seconds, the output voltage is reduced to

0 volts and the cycle is repeated.

SYNC A OUTPUT

Sync A Output

SYNC

(50

!I)

TTL square wave with the frequency and phase of the channel A output is available at the front panel SYNC A (SYNChronous with channel sition occurs at the midpoint between peaks on the channel

connector. The SYNC A tran-

signal. Figure 1-33 illus-

trates the oscilloscope connections used to obtain the display. Figure 1-34 illustrates

the output from the SYNC output is

When the SYNC A output is terminated in

Low level High level

If the pedance load, the voltage levels will be approximately twice the values listed, Improper termina-

tion of

positive and negative transitions.

and CH A connectors. The impedance of the SYNC

the output levels are:

0.2

1.2

SYNC

output is connected to a high im-

system may cause ringing at the

20-33

MHz

L.O. OUTPUT (EXTENDED FREOLIENCY)

20M3

B~LO

'=ZOO

The rear panel 20-33

Mi-r

OUT

miDkNi

from the channel B output. The output is ac coupled with a level greater than 100 mV

MHz

B-L.O.

OUT

connector supplies a signal offset by 20

peak-to-peak into 50 ohms. The output frequency is controlled through a channel key entry, channel

sweep, or channel B phase modulation. Figure 1-35 illustrates the

oscilloscope connections used to obtain the display. Figure 1-36 illustrates the output

MHz

from the 20-33

B-L.O. OUT connector.

FREQ

MHz

20-33

MHz

L.O.

Output

Phase Lock~ng to an External Reference

EXTERNAL REFERENCE OR OVEN STABILIZED FREQUENCY OPTION

MHz

Oven Output

OVEN

OUT

OPTION

001

1'3

dBml

The 10 MHz OVEN OUT OPTION 001 connector is available if the high stability frequency

reference (Option 001) is installed. Option 001 is a 10 MHz temperature (oven) stabilized crystal oscillator. The crystal oscillator connects to the HP

(High

cuits by connecting the 10 MHz REF IN connector with a BNC to BNC adapter (HP part number 1250-1499).

The 10 MHz OVEN OUT OPTION 001 output is a square wave with a level greater than

dBm (50 R). The output is present whenever the HP 3326A is connected to a power

source.

To reduce the

warmup time and obtain maximum performance from an HP 3326A equipped with Option 001, leave the HP 3326A connected to a power source. Power is supplied to Option 001 whenever the HP 3326A is connected to a power source. An HP 3326A with Option 001 requires 15 minutes of operation to meet frequency specifications if power is disconnected for less than 24 hours. If power is disconnected for more than 24 hours, the HP

frequency specifications.

External Frequency Reference

,,,,,

l>O

The HP 3326A is phase-locked to external frequency references through the 1,

10 MHz REF IN connector. Phase-locking to an external frequency reference transfers

dBml

the external reference's frequency accuracy and aging rate to the HP 3326A. The level of the frequency reference must be from 0 dBm to

must be 10 MHz

The front panel EXT REF indicator illuminates when the HP 3326A is phased-locked to an external frequency reference. The message "Error 180 XREF" (external ence) is displayed if a signal is present and the HP 3326A is not phase-locked. The

MHz OVEN OUT OPTION 001 output is connected to this connector if the high sta-

bility frequency reference (Option 001) is installed.

Stability Frequency Reference - Option 001)

3326A frequency cir-

10 MHz OVEN OUT OPTION 001 connector to the

2, 5,

3326A may require up to 72 hours of operation to meet

20 dBm (50 R). The frequency

10 ppm) or a subharmonic down to 1 MHz (e.g. 1, 2, 5, or 10 MHz).

REFer-

1 OMHz OUT connector supplies a 10 MHz square wave derived from the frequency

The

reference of the HP 3326A. The square wave has a level greater than 3 dBm (50 R),

This output can be used to phase-lock an analyzer or other instrumentation to the frequency reference of the HP

3326A.

CHAPTER

HP-IB OPERATION

Chapter

Table

Contents

DESCRIPTION OF THE HP-IB HP 3326A HP-16 CAPABILITY HP-IB INTERFACE MANAGEMENT LINES TALK 1 LISTEN ADDRESSES

............

...........

...

..............

VIEWING THE HP 3326A HP-IB ADDRESS CHANGING THE HP 3326A HP-IB ADDRESS

BUS MESSAGES SERVICE REQUEST THE STATUS BYTE

MASKING THE STATUS BYTE

......................

.....................

....................

...........

Qservice ----- This Document is a complete scan from the Original HP - Agilent Manual ----- Qservice

HP-IB

Capab~l~ty

HP 3326A HP-IS CAPA

The HP 33268 interfaces to the HP-IB as defined by IEEE Standard terface functional subset which the HP 3326A implements is specified in Figure

HP-IS INTERFACE MANAGEMENT LINES

Five lines in the HP-IB manage the orderly flow of information across the HP-IB. Figure 2-3 describes the lines used in managing the HP-IB.

488-1

978.

The in-

2-2.

TALKlLlSTEN ADDRESSES

Each HP-IB device has at least one talk, and one listen address (unless the device is totally transparent, or a talk only or listen only device). Device addresses are used by the active controller in the COMMAND MODE (ATN true) to specify the talker (via a talk address) and the listener (via listen addresses). There may be only one talker addressed by the controller to talk at any time.

TalklL~sten Addresses

The address of a device is usually preset at the factory and is resettable during system

configuration. In the binary representation of the address, the device address is the decimal equivalent of the five least significant bits of the address. (On HP-IB devices with selector switches, these are the five address switches.) The address can be from

inclusive. The sixth and seventh bits determine

the address is a talk or listen

address respectively. High level HP-IB controllers typically configure these two bits au-

2-4

tomatically. Figure

lists the HP-IB addresses if a controller requires the talk and

listen addresses.

ViewingIChanging

HP-IB

Address

The talk and listen addresses fall within the printable ASCII character set. When a device

receives one of these characters while ATN is true, it becomes addressed. The ASCII

character

"?"

(ASCII 31) unaddresses all devices while ATN is true. The device address (set from the HP 3326A front panel) is used by HP-IB controllers most of which automatically send the talk and listen address characters.

VIEWING THE HP 3326A HP-IB ADDRESS

The HP-IB address of Phe HP 3326A is stored in a nonvolatile memory (there are no address switches). The HP 3326A address appears in the display when the BUS AD-

DRESS key in the HP-IB STATUS block is pressed. The BUS ADDRESS key is selected

by pressing the blue SHIFT key followed by the LOCAL key. The HP 3326A address

is removed from the display by pressing another key that requires the display.

CHANGING THE HP 3326A HP-IB ADDRESS

Every device on the HP-IB must have a unique address. The HP 3326A address can be set at any address between 0 and 30, inclusive and is stored in internal nonvolatile memory. When selecting an address, remember that the controller also has an address (usually 21). To change the HP-IB address:

Press the blue SHIFT key followed by the LOCAL key in the HP-IB

STATUS block to display the HP-IB address. Enter the address with the numeric keypad. For two digit HP-IB ad-

dresses, the address is set when the second digit is entered. For a single digit HP-IB address, the address is set when any units key is pressed. Alternately, a zero can precede the single digit to form a two digit address.

The HP-IB address is reset to

clear opera tion.

The message "Error 20 RNGE" is displayed if the HP-IB address exceeds 30.

BUS MESSAGES

NOTE

after a memory

The HP-IB interface system operates in either of two modes: command mode (ATN bus management line true) or data mode (ATN bus management line false).

an HP controller is used, the bus management lines are configured automatically and all necessary command strings are issued.

In the command mode, devices on the HP-IB can be addressed or unaddressed as

listeners or talkers. Bus commands are also issued in the command mode. These commands may instruct the HP-IB interface to control the instrument (like CLEAR or TRIGGER) but are more often used for bus management (REMOTE, LOCAL,

POLLS, SERV-

Bus

Messages

ICE REQUEST, ABORT interface activity, or PASS CONTROL). Bus commands are issued

through one of the bus management lines or through the eight bit data bus. Figure 2-5

lists the commands used in the command mode. In the data mode, data or instructions are transferred between instruments on the

HP-IB. Instructions transferred to the instrument are called device dependent commands. All the commands specifically for the HP

3326A fall into this category. The HP 3326A device dependent commands configure the HP 3326A, initiate measurements, initiate data transfers, or define error reporting conditions. These device dependent commands are meaningless for other instruments. The HP

3326A device dependent

commands are listed in Chapter Ill.

One of the five bus management lines connected to every device on the bus is the SRQ line. The SRQ line is used by a device to indicate the need for attention from the con-

troller. When the

the front panel SRQ indicator, and generates the SRQ, Bit six, the require service bit,

is sometimes referred to as the status bit in connection with a poll. Any bit in the status byte may initiate an SRQ. The status byte may be masked to select which bits cause the

3326A

When a controller senses an SRQ, it can poll each device to fine the device requiring service. The

3326A

to set the SRQ line.

3326A

requires service, it sets bit six of the status byte, illuminates

responds to a serial poll by returning its status byte.

THE STATUS BYTE

The status byte is an eight bit word transmitted by the HP 3326A in response to a serial poll. The state 2-6 describes the HP 3326A status byte bit positions, and the events and conditions that set and reset each bit. Any status bit becomes enabled (set) when the condition

it represents changes from false to true. An enabled bit sets bit 6, and generates an

SRQ

if the Boolean

Statbs

each bit indicates the status of an internal HP 3326A function. Figure

AND

of the status byte and the status byte mask is not equal to zero.

Byte

Masking the Status Byte

MASKING THE STATUS BYTE

The

3326A MASK command specifies which bits in the status byte will be enabled to generate an SRQ. The MASK command has the syntax of "MASKnPC" where n is an integer number corresponding to the enabled bits in the status byte, and PC is the suffix used to end the command. The integer number is determined by summing the decimal values of the enabled bits in the status byte. Figure 2-6 describes the HP 3326A status byte and lists the decimal value of each bit position. The require service bit (bit

6) cannot be disabled.

CHAPTER 3 HP 3326A HP-IB COMMANDS

Chapter

Table of Contents

REMOTE FRONT PANEL OPERATION COMMAND SYNTAX 3.1

BUSMODES 3-3

...........................................

..............................

VIEWING THE HP 3326A HP-IB ADDRESS CHANGING THE HP 3326A HP-IB ADDRESS

INTERROGATING THE HP 3326A FOR SETUP PARAMETERS DISPLAYING THE HP 3326A SETUP PARAMETERS MODIFYING PARAMETERS DISPLAY CONTROL

...........

...................................

SAVING OR RESTORING AN HP 3326A SETUP HP 3326A IDENTIFICATION

TRIGGERED SWEEPS

...................................

..........................

READING AND MASKING THE STATUS BYTE ERROR CODES HP 3325A COMPATIBILITY UNITS

..............................

....................................

............................

HP 3326A MNEMONICS SUMMARIES

...................

.....

..............

. . .

...............

............

.........

........

3.1

3.3

3.4

3.4 3-4

.3-5

3-6

3.6 3-7 3-8

3-8 3-10 3-12 3-13

3-14

Qservice ----- This Document is a complete scan from the Original HP - Agilent Manual ----- Qservice

Command

Syntax

HP-IB command requiring a range value or a suffix, the applicable range limit and suffix are also listed. The following conventions apply to the HP 3326A HP-IB commands:

The HP 3326A accepts data in seven bit ASCII code and ignores the

eighth (parity) bit. All characters other than A through

(+),

minus

(-),

period

(.),

question mark

a through z, 0 through

(?),

and pound sign

(#)

plus

are treated as command separators. Command separators may not be embedded in an HP-IB command mnemonic.

Two successive HP 3326A HP-IB commands must be separated by a command separator, or the last character of the first command may be sent with EOI.

Range values may be in integer, real, or exponential form. For positive values, only the first eleven digits of the mantissa are used. For negative values, only the first ten digits of the mantissa are used.

Leading zeros before the decimal point are ignored. An HP-IB mnemonic must precede any setup data or suffix.

After information is requested from the HP 3326A, the HP 3326A

responds with the information when it is addressed to talk.

The HP

COMMAND FORM EXAMPLE EXAMPLE DESCRIPTION

3326A uses the following forms for HP-IB commands:

Mnemonic EOS "CHA" Channel A

Mnemonic Suffix EOS "FCNA SIN" Sine function for channel A Mnemonic Data EOS "HVA Mnemonic Range data Suffix EOS

Mnemonic

EOS

0" High voltage off

"AM

VO" Amplitude of 1 Vrms

"FR?"

l nterrogate frequency

where:

mnemonic is the HP-IB mnemonic

EOS indicates the end of

string marker (a command separator, typically the carriage return

and line feed supplied by the controller)

suffix is an alphabetic code for units, function, or mode

data is a numeric code for a function or mode

range data

is used to interrogate the HP 3326A

the value for an entry parameter

A program string for the HP 3326A may contain multiple HP-IB commands such as "CHA FCNA SIN HVAO AM1VO FR?" For a program string, a command separator (in this example, a space) is required between HP-I6 commands.

Bus

Modes

The HP 3326A accepts data and commands from the HP-IB in either of two modes:

bus mode 1 or bus mode 2. Bus mode

Bus mode 2 should be used if speed of communications is a critical factor in the HP-IB

system.

BUSMl

In BUSMl (BUS Mode I), the default operating mode, the HP 3326A processes one character (byte) at a time. That is, the controller must wait for the HP 3326A to finish processing a previously accepted character before the HP

tional character in the command.

is the default operating mode for the HP 3326A.

3326A will accept an addi-

NOTE

In bus mode characters. If a measurement sequence is started

immediately after issuing a command to the

3326A, the HP 3326A may not have finished

processing the last command. To check if the

3326A command processing is complete, mo-

nitor the ready bit in the status byte with a serial

poll, or mask the status byte ready bit and monitor

the

SRQ

status of commandprocessing is to issue the command WAIT, The HP handshake on the command WAIT until the last character is accepted. This insures that the previous command has been processed.

When BUSM2 (BUS Mode of HP-IB data. While the buffered characters are being processed, the controller can communicate with other devices on the bus. If the buffer becomes full, the HP does not complete the HP-IB handshake (i.e. delays the controller) and will not accept additional characters until all the buffered characters are processed. To check if the

3326A command processing is complete, monitor the ready bit in the status byte

with a serial poll, or mask the status byte ready bit and monitor the SRQ line.

the HP 3326A buffers up to three

line. An alternate approach to check the

3326A does not finish the

is in effect, the HP 3326A buffers up to

100

characters

3326A

VIEWING

THE HP

The HP-IB address of the HP 3326A is stored in nonvolatile memory (there are no address switches). The HP 3326A address appears in the display when the BUS ADDRESS key in the HP-IB STATUS block is pressed. The BUS ADDRESS key is selected by pressing the blue SHIFT key followed by the LOCAL key. The HP 3326A address is removed from the display by pressing another key that requires the display.

3326A

HP-18

ADDRESS

Changing the

HP-IB

Address

CHANGING THE HP 3326A HP-16 ADDRESS

The HP 3326A address can be set at any address between 0 and 30, inclusive. The

HP-IB address of the HP 3326A is set to 18 at the factory and stored in nonvolatile memory. When selecting an address, remember that the controller also has an address (usually 21).

To change the HP-IB address:

Press the blue SHIFT key followed by the LOCAL key in the HP-IB

STATUS block to display the HP-IB address.

Enter the address with the numeric keypad. For two digit HP-IB addresses, the address is set when the second digit is entered. For single digit HP-IB addresses, the address is set when any units key

is pressed. Alternately, a zero can precede the single digit to form a two digit address.

NOTE

The HP-IB address is reset to

clear opera tion.

The message "Error 20 RNGE" is displayed if the HP-IB address ex-

ceeds 30.

after a

memory

INTERROGATING THE HP 3326A FOR SETUP PARAMETERS

The value of a setup parameter is read over the HP-IB by sending the parameter HP-IB

mnemonic followed by a question mark the parameters that can be interrogated and the form of the response. For example, sending the mnemonic FR? sets up the HP for the selected channel. The frequency value is transmitted when the HP 3326A is addressed to talk. Each value is returned with units.

The HP 3326A always responds with the units Hertz for frequency values, volts peak-

to-peak for amplitude values, seconds for time values, volts dc for offset values, degrees for phase, and percent for duty cycle. The HP

degrees for modulat~on level. Each interrogation response ends with a carriage return

(ASCII 13) and line feed (ASCII 10) character.

(?).

The HP-IB command summary table lists

3326A to respond with the frequency value

3326A responds with either percent or

DISPLAYING THE HP 3326A SETUP PARAMETERS

The current value for a setup parameter is displayed on the HP 3326A front panel if

the corresponding HP-IB mnemonic is sent without data and a suffix. For example, send-

ing the mnemonic AM displays the amplitude value for the selected channel but does

not change the amplitude value.

Modifying

Parameters

The units for the displayed value of a setup parameter change to new units if the corresponding HP-IB mnemonic and new suffix are sent without data. For example, sending the mnemonic AM DBV displays the current amplitude value in

dBV for the selected

channel. Sending the AM DBV command does not change the amplitude value.

NOTE

MODIFYING

If the display is disabled with the DSPO command, the requested value is not displayed.

DSP

OFF

PARAMETERS

The HP 3326A modify functions are implemented over the HP-IB with the ElNC (Entry

INCrement), UP, and DN (DowN) HP-IB commands. The TDN (Trigger DowN) and TUP (Trigger UP) HP-IB commands enable the HP display value whenever a trigger is received. The front panel modify controls are ena-

bled (for local operation) and disabled with the MFY (ModiFY) command.

ElNC

The amount to increment or decrement the display value is set with the ElNC (Entry

INCrement) HP-IB command. The ElNC command includes a positive range value and

a suffix applicable for the value to be modified. Values entered with the ElNC command

apply only to the UP, DN, TUP, and TDN HP-IB commands. Only one ElNC value is

stored internally by the HP

3326A. An error is generated if the display is incremented or decremented and the ElNC command suffix is not compatible with the units of the displayed value. An example of the ElNC command is EINC10.2KHZ.

MFYO

MFY OFF

The MFYO (ModiFY) or MFY OFF command disables the front panel modify controls

and inhibits the flashing digit on the front panel display.

3326A to increment or decrement the

MFYl

MFY

The MFYl (ModiFY) or MFY ON command enables the front panel modify controls. The

HP 3326A must be put into local before the HP 3326A accepts changes through the

modify controls.

TUP

and

TDN

The TUP (Trigger UP) and TDN (Trigger DowN) HP-IB commands enable the HP 3326A

to increment or decrement the display value by the increment set with the ElNC mnemonic whenever a trigger is received. The HP

3326A responds to either a trigger applied through the rear panel EXT TRIG (EXTernal TRIGger) connector, or to the HP-IB group execute trigger command. The TUP and TDN commands do not require a range value or suffix.

Display Control

TOFF

The TOFF (Trigger OFF) command disables trigger operations on the HP 3326A. Trig-

ger operations are enabled when power is applied, after an instrument preset, or with the TDN, TUP, STC, and STS HP-IB commands.

and

The UP and DN (DOWN) commands increment and decrement the display value by the

increment set with the ElNC mnemonic. The UP and DN commands do not require a range value or suffix.

DISPLAY CONTROL

DlSPO

DlSP OFF

The DlSPO (DISPlay) or DlSP OFF command inhibits the HP 3326A from displaying setup values on the front panel display. While the display is disabled, dlSP OFF (display OFF)

appears in the display and all front panel indicators (except the HP-IB Status) are extinguished. The display is returned to normal with the

NOTE

DlSPl

DlSP ON

If the HP

play disabled, the HP

front panel ke ys. To restore the HP

panel operation without a controller, apply power

with the shift key depressed (a memory clear operation). nonvolatile memory with preset state setup data, and changes the HP-IB address to

3326A

memory clear replaces the contents of the

is returned to local with the dis-

3326A

The DlSPl (DISPlay) or DlSP ON command enables the HP 3326A to display setup values on the front panel display. The DlSPl or DlSP ON command is necessary only if the HP 3326A display is disabled during HP-IB operation.

SAVING OR RESTORING AN HP 3326A SETUP

DlSPl or DlSP ON command.

will not respond to the

3326A

to front

18.

The contents of any HP 3326A memory register can be accessed over the HP-IB. The data is transferred over the HP-IB in binary form with the LRN (LeaRN) and PRG (PRo-

Gram) mnemonics. This binary form is useful for storing HP 3326A setup data in external memory for more permanent storage. The SAV

(SAVe) mnemonic stores HP 3326A

setup data in internal nonvolatile memory, and the RCL (ReCaLI) mnemonic recalls

HP 3326A setup data from internal nonvolatile memory.

Saving or Restoring a Setup

LRN

The LRN (LeaRN) command, combined with an integer, configures the HP 3326A to

transfer the setup data stored in the nonvolatile memory register over the HP-IB. The

LRN command has the syntax of LRNn where n ranges from 0 to 9 and represents the

nonvolatile memory register to transfer. After the HP

ASCII characters #A followed by two length bytes and 168 bytes of binary data are trans-

mitted by the HP

nificant bytes of the number of bytes transmitted. The binary transmission is ended with the HP-IB EOI bus management line being asserted on the last byte. Note that the controller must read the data after issuing this command.

PRG

3326A. The length bytes represent the most significant and least sig-

3326A is addressed to talk, the

The PRG (PRoGram) command, combined with an integer ranging from 0 to 9, prefaces the 172 bytes of binary setup data to be loaded into the HP 3326A nonvolatile memory. The integer specifies the nonvolatile memory register to receive the binary setup data. The new setup is set after the last data word is received. Data loaded into the HP

must be data output by the LRN command. The received HP-IB data is checked inter-

nally to insure data integrity.

RCL

The RCL (ReCaLI) command, combined with an integer, recalls a stored instrument setup

from internal memory to the current HP 3326A setup. The RCL command has the syn-

tax of RCLn where n is an integer ranging from 0 to

of the stored the setup data.

The SAV (SAVe) command, combined with an integer, stores the current HP 3326A setup

in internal memory. The SAV command has the syntax of SAVn where n is an integer

ranging from

3326A IDENTIFICATION

ID?

The ID command transmits the HP 3326A identification code (HP3326A) to the remote

interface.

3326A

and represents the memory register

to 9 and represents the memory register to receive the setup data.

REV?

The REV? command transmits a pair of revision date codes (the revision and capability

date) for the program stored in the HP 3326A read only memory. The date code pair

is transmitted as since 1960 is represented by the first two digits, and the week is represented by the second two digits in each number.

nnnn,nnnn where nnnn represents each four digit integer. The year

Triggered Sweeps

SER?

The SER? (SERial number) command transmits a ten character string stored in the

HP 3326A read only memory. The ten character string has the form of nnnnAOOOO where nnnn represents an integer corresponding to the revision date for the HP 3326A soft-

ware. The year is represented by the first two digits, and the week is represented by

the second two digits. The next character in the string is the the remaining characters are zeros. The actual serial number of the HP stored in memory.

TRIGGERED SWEEPS

The sweep functions of the HP 3326A operate under trigger control when the STC (Sweep Triggered Continuous) or STS (Sweep Triggered Single) HP-IB commands are in effect. The HP 3326A responds to either a trigger applied through the rear panel EXT TRIG

(EXTernal TRIGger) connector or to the HP-IB group execute trigger command. Refer

to the controller operating manual for implementation of the group execute trigger

command.

ASCII character A, and

3326A is not

STC

The STC (Sweep Triggered Continuous) command enables the HP 3326A to initiate a

continuous sweep when a trigger is received. A sweep in progress is stopped after the STC command is issued. The shortest delay start occurs when the trigger is preceded by the SRE (Sweep REset) command.

STS

The STS (Sweep Triggered Single) command enables the HP 3326A to initiate a single sweep when a trigger is received. A sweep in progress is stopped after the STS command is issued. The shortest delay

10 IS) between a trigger and sweep start occurs

when a trigger is preceded by the SRE (Sweep REset) command.

TOFF

The TOFF (Trigger OFF) command disables trigger operations on the HP 3326A. Trigger operations are enabled when power is applied, after an instrument preset, or with the TDN, TUP, STC, and STS HP-IB commands.

READING AND MASKING THE STATUS BYTE

The MASK command specifies which bits in the status byte are enabled to generate an SRQ. The status byte is an eight bit word that the HP 3326A outputs when requested by a serial poll. The state of each bit indicates the status of an internal HP tion. A service request is generated when the Boolean AND of the status byte and status byte mask is not equal to zero.

10 IS) between a trigger and sweep

3326A func-

Status

Byte

MASK

The MASK command has the syntax of MASKnPC where n is an integer corresponding

to the enabled bits in the status byte, and PC is the suffix used to end the command. The integer is determined by summing the decimal values of the enabled bits in the

status byte. Figure of each bit position. The require service bit (bit 6) cannot be disabled and mask programming for this bit is ignored.

3-1 describes the

3326A status byte and lists the decimal value

Error

Codes

Examples: To enable the error bit (bit send the command MASK32PC. To enable the error bit (bit

32) and ready bit (bit 4 with a decimal value of mand MASK48PC where 48 is the sum of

ERROR CODES

ERR?.

The ERR? command transmits

register, and resets the error bits in the status byte. Bit either a program error or hardware error occurs. Bit occurs, and bit 3 is also set when a hardware error occurs. Figure 3-2 summarizes the error codes and Appendix A provides additional detail on the error codes.

with a decimal value of 32) to generate an SRQ,

with a decimal value of

16)

to generate an SRQ, send the com-

plus 32.

the

code for the last error that occurred, resets the error

in the status byte is set when

is also set when a program error

Error

Codes

ibility

For compatibility with existing programs, the HP 3326A supports many of the HP 3325A

SynthesizerIFunction Generator HP-IB commands. The major changes required in adapt-

ing an HP

3325A program for HP 3326A operation are adding the CHA or CHB command to specify the affected channel of the HP 3326A, and reducing frequency values greater than 13 MHz. Figure 3-3 lists the mnemonics unique to HP 3325A that are recog-

nized by the HP

terrogations for entered values that have the letter

3326A. For HP 3325A compatibility, the HP 3326A also recognizes in-

preceding the mnemonic,

HP 3326A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual