AEMC Instruments GX320 User manual

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Copyright ©

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99-MAN 100379 - v2 03/17

Contents

Contents

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General Instructions ............................................................................................................................................. 4

Introduction......................................................................................................................................................... 4

Contents of the box ............................................................................................................................................ 4

Precautions ........................................................................................................................................................ 4

Safety measures ................................................................................................................................................ 4

Guarantee .......................................................................................................................................................... 5

Maintenance, metrological checks ..................................................................................................................... 5

Maintenance....................................................................................................................................................... 5

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GX 305 and GX 310 Description........................................................................................................................... 6

Presentation ....................................................................................................................................................... 6

Specifications..................................................................................................................................................6

Front Face .......................................................................................................................................................... 6

Back Face .......................................................................................................................................................... 7

Display................................................................................................................................................................ 7

Keys.................................................................................................................................................................... 9

Pressing keys for less than < 1s.....................................................................................................................9

Pressing keys for more than > 1s.................................................................................................................11

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GX 320 Description ............................................................................................................................................. 12

Presentation ..................................................................................................................................................... 12

Specifications................................................................................................................................................12

Front Face ........................................................................................................................................................ 12

Back Face ........................................................................................................................................................ 13

Display.............................................................................................................................................................. 13

Keys.................................................................................................................................................................. 16

Pressing keys for less than < 1s...................................................................................................................17

Pressing keys for more than > 1s.................................................................................................................18

Chapter IV

General commands ............................................................................................................................................. 19

Commissioning................................................................................................................................................. 19

in Normal mode ............................................................................................................................................19

in Version mode............................................................................................................................................19

in Calibration mode.......................................................................................................................................19

in Autotest mode...........................................................................................................................................19

Stop .................................................................................................................................................................. 20

Activating MAIN OUT ....................................................................................................................................... 20

Adjusting screen contrast ................................................................................................................................. 21

Selection of the instrument function ................................................................................................................. 21

Display of the software version ........................................................................................................................ 22

Automatic calibration ........................................................................................................................................ 22

Instrument Autotest .......................................................................................................................................... 25

Saving a configuration (GX 320) ...................................................................................................................... 28

Reloading a configuration (GX 320)................................................................................................................. 29

Clearing a configuration (GX 320).................................................................................................................... 30

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Generation of simple CONTinuous periodical signals.................................................................................... 31

Available output signals.................................................................................................................................... 31

Signal selection ................................................................................................................................................ 31

Adjusting signal frequency ............................................................................................................................... 32

Adjusting signal duty cycle ............................................................................................................................... 35

Adjusting signal amplitude................................................................................................................................ 35

Adjusting offset and DC level ........................................................................................................................... 36

Adjusting signal logical levels........................................................................................................................... 36

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Contents

SHIFT Shift Keying function (GX 320 only)....................................................................................................... 37

Connections ..................................................................................................................................................... 37

Selection of FSK mode..................................................................................................................................... 37

Selection of PSK mode .................................................................................................................................... 37

Selection of piloting source .............................................................................................................................. 37

Adjusting jump frequencies (in FSK mode)...................................................................................................... 38

Adjusting jump phases (in PSK mode)............................................................................................................. 38

Other settings ................................................................................................................................................... 38

SWEEP Frequency scan function...................................................................................................................... 39

Connections ..................................................................................................................................................... 39

Selection of the sweep mode ........................................................................................................................... 39

Selection of the scan source ............................................................................................................................ 40

Adjusting START / END frequencies ............................................................................................................... 40

Adjusting scan period using an INTernal source.............................................................................................. 41

Other settings ................................................................................................................................................... 41

MODUL Modulation function (GX 320 only) ..................................................................................................... 42

Connections...................................................................................................................................................... 42

Selection of AM / FM mode .............................................................................................................................. 42

Selection of the modulation source .................................................................................................................. 43

Adjustment of the FM START / END frequencies............................................................................................ 43

Other settings ................................................................................................................................................... 43

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FREQ Frequency meter function ....................................................................................................................... 44

Connections..................................................................................................................................................... 44

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SYNC Synchronisation function (GX 320 only) ................................................................................................ 45

Connections..................................................................................................................................................... 45

Selection of SLAVE / MASTER mode ............................................................................................................. 46

Adjusting dephasing ........................................................................................................................................ 46

Activating signal generation (MASTER) .......................................................................................................... 47

Other settings .................................................................................................................................................. 48

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GATE function (GX 320 only) ............................................................................................................................. 50

Connections..................................................................................................................................................... 50

Activation, Deactivation of GATE .................................................................................................................... 50

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BURST pulse burst function (GX 320 only) ...................................................................................................... 51

Connections..................................................................................................................................................... 51

Selection of the BURST source....................................................................................................................... 51

Setting the number of pulses........................................................................................................................... 52

Setting the generation time for INTernal source.............................................................................................. 52

Manual triggering in EXTernal source ............................................................................................................. 52

Other settings .................................................................................................................................................. 52

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Remote programming (programmable device only) ........................................................................................ 53

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Technical specifications..................................................................................................................................... 56

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General, Mechanical specifications............................................................................................................. 60, 61

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Supplies................................................................................................................................................................ 62

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General Instructions

General Instructions

Introduction You have just purchased a GX 305, GX 310 or GX 320 Function Generator

and we appreciate your confidence.

Content of the box

Precautions

Safety measures

• the generator

• the safety notice

• the power supply cable

• the USB A/B cable for the programmable versions

• the ETHERNET cable for the GX 320E

• the CD-ROM containing:

the operating guide in 5 languages
the programming in 2 languages
the USB ‘CP210x USB to UART Bridge Controller’ Drivers
the LabView and LabWindows Drivers
the USBxPress application (USB port identification)
the GX320E-Admin (IP address programming)

To obtain the best service:

- read this notice carefully,

- respect the safety instructions.

Failure to respect the warnings and/or usage instructions may damage the
device and/or installations and may be dangerous for the user.

This instrument complies with the NF EN 61010-1 - Ed. 2 (2001) safety
standard relating to the safety of electric measurement devices.

Definition of

installation

categories

• It is designed for indoor use in an level 2 pollution environment at an altitude

of less than 2000 m, a temperature between 0° C and 40° C and a RH
(relative humidity) of less than 80% up to 40° C.

• The MAIN OUT, SWEEP OUT, TTL OUT outlets are referenced t

o earth and
protected from accidental voltages that are not in excess of 60 V DC or
40 V AC.

• The FREQ EXT entry can only be used for measurements on Category 1

installations and for voltages not exceeding 300 V in relation to the earth.

• Mains power supply: 120 V

CAT II:

Category II corresponds to measurements on circuits that are directly

connected to low voltage installations.

Example: power supply for household appliances and portable tools

CAT III:

Category III corresponds to measurements on the building

installation.

Example: power supply for industrial machinery or devices.

CAT IV:

Category IV corresponds to measurements at the source of the low

voltage installation.

Example: power supply

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General Instructions

General Instructions (contd.)

Symbols on the

instrument

Guarantee

Warning: potential hazard, refer to the operating guide.

Selective waste sorting for recycling electric and electronic waste. In
compliance with the WEEE 2002/96/EC directive:
the device should not be considered as household waste.

Earth terminal

Alternating signal



This equipment is guaranteed for all manufacturing and parts defects in
compliance with the general terms and conditions which are available on request

During the warranty period (3 years), the instrument may only be repaired by the
manufacturer who reserves the right to make the decision to either repair or
replace all or part of the appliance. In the event of a return of the equipment to
the manufacturer the shipping charge from the customer to the manufacturer is
at the customer’s expense.

Indication of a key double function when pressed for mo
second

USB symbol

re than 1

Maintenance, repairs, metrological checks

Cleaning

The guarantee does not apply in the following conditions:

• inappropriate use of the equipment or use with incompatible equipment

• one or more changes made to the equipment without prior explicit

authorisation from the manufacturer’s technical department

• an intervention is made on the instrument by a person n

manufacturer

• the adapting to a specific application that is not part of the definition of the

instrument or in the operating guide

• damage caused by a mechanical shock, by dropping the instrument or by

flooding.

The device includes no parts that can be replaced by the operator. All operations
must be carried out by competent approved personnel.

For checks and calibrations, contact one of our accredited metrology laboratories
(information and contact details available on request), at our Chauvin Arnoux
subsidiary or the branch in your country.

No interventions are authorised inside the instrument.

- Turn the instrument off (remove the power supply cable).

- Clean using a damp cloth and soap.

ot approved by the

- Never use abrasive products or solvents.

- Dry quickly using a dry cloth or an air blower at max. 80° C.

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GX 305 and GX 310 Description

GX 305 and GX 310 Description

Presentation

Specifications

Front face

The GX 305 and GX 310 are alternating standard form wave generators, using the
DDS (Direct Digital Synthesis) technology. They may simulate the operation and
specifications of various electronic systems.
They also include a frequency meter input.

The GX 310P is a generator that can be programmed remotely via an USB link.

- Wave form: sinusoidal, square, triangle, logical, TTL, continuous

- Wave frequency: GX 305  0.001 Hz to 5 MHz for the sinus and the square

0.001 Hz to 2 MHz for the triangle

GX 310  0.001 Hz to 10 MHz for the sinus and the square

0.001 Hz to 2 MHz for the triangle

- INT and EXT sweep: GX 305  adjustable from 0.001 Hz to 5 MHz
GX 310  adjustable from 0.001 Hz to 10 MHz

- EXT freq. meter : from 5 Hz to 100 MHz

Back lit LCD display (124 x 43 mm)

Coding wheel

ON /

STANDBY

1.

2.

3.

4.

Terminals

1.

2.

3.

4.

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MAIN OUT

- Main output

VCF IN

- SWEEP input pilot signal in EXTernal source
SWEEP OUT

- Pilot output signal for INTernal SWEEP

TTL OUT

- TTL output

FREQ EXT

Frequency meter input

-

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GX 305 and GX 310 Description

GX 310 Description (contd.)

Back face

GX 305

Working voltage indicator

Network connection

Display

GX 310

GX 310P

USB type B connection

Working voltage indicator

Network connection

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GX 305 and GX 310 Description (contd.)

Wave selection:

• Sinusoidal

• square

• logic

• triangle

• continuous

Indication of the displayed frequency:

• Freq, Freq

• Time (sweep interval)

Frequency display (digit height: 20 mm)

Underscores: Indication of the digit to which the wheel

Unit of measure display

• degree

• MHz, kHz, Hz

• seconds

START

or Freq

END

increments apply during adjustment.

GX 305 and GX 310 Description

Function selection: current function indicator

• continuous

• sweep

• frequency

Duty cycle value display

Display of the amplitude value

Display of the offset value or the DC level

OFFSET display

DUTY display

AMPLITUDE display

Logical HIGH / LOW display

INTernal / EXTernal source selection

LINear / LOGarithmic sweep display

Sawtooth or triangle type sweep

Indication that the MODE key is assigned:

• to trigger the adjustment step when calibrating

• to trigger the selected test in Autotest

During calibration the is assigned to saving the parameters.

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GX 305 and GX 310 Description

GX 305 and GX 310 Description (contd.)

Keys 

The keys with the  symbol have a specific action when pressed for more
than 1 second.

• The white keys may have a backlight:

Appliance under power but not turned on

Appliance turned on

MAIN OUT

Key lit  MAIN OUT exit activated

• The other keys can be:

 keys not assigned to the wheel adjustment or

unlit

having no action

 the corresponding adjustment is assigned to the

lit

wheel.

 the corresponding adjustment can be assigned to

blinking

the wheel.

 Each time the WAVEFORM or FUNCTION is changed the keys that can be

assigned to the wheel adjustment blink for 4 seconds; if no keys are used

at this time the frequency adjustment (Freq or Freq

wheel.

) is assigned to the

START

Keys pressed for

less than 1 second

MAIN OUT

Sinusoidal waveform selection

Selects square or logical waveform by successive pressing on the key

Triangular waveform selection or saves adjustments during calibration

Continuous waveform selection

Validation, or not, of the waveform on the MAIN OUT BNC

Adjustment of the duty cycle using the wheel (square, triangle)

Adjustment of the output signal amplitude using the wheel

• Offset adjustment using the wheel

• DC level adjustment if the continuous waveform is selected.

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GX 305 and GX 310 Description (contd.)

Keys pressed for

less than 1 second

(contd.)

GX 305 and 310 Description

LOGIC LEVEL

FUNCTION

LOGIC waveform selected:
Adjustment of the high or low signal level using the wheel

FUNCTION keys:

Selection of one of the three available functions

SWEEP selection of the INTernal or EXTernal command signal

• SWEEP activated: selection of LIN or LOG sweep

• calibration: triggering of the selected adjustment step

• Autotest: run the selected test

SWEEP function activated in INT: assignment of the desired duration setting
for carrying out the sweep using the wheel.
Then, by pressing several times, selection of the digit on which to increment.

Division or multiplication by 10 of the current frequency value (decade change)

• Assignment of frequency adjustment to the wheel.

Then, by pressing several times, selection of the digit on which to
increment.

• SWEEP function activated: same functions with Freq

requencies.

f

START

and Freq

END

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GX 305 and GX 310 Description

GX 305 and GX 310 Description (contd.)

Keys pressed for

more than 1 second

Pressing the key for more than 1 second forces the duty cycle to 50%.

Pressing the key for more than 1 second switches from a peak to peak
amplitude display to an RMS (root mean square) display.

Pressing the key for more than 1 second forces the offset value to 0.

LOGIC LEVEL

Pressing the key for more than 1 second assigns the LCD contrast adjustment
to the wheel.

For the SWEEP function, pressing the key for more than 1 second switches
from Freq

These keys assign the selected frequency to the start or end of the current
range.

START

to Freq

and vice versa.

END

Ranges

Press > 1 Second

‘RANGE-’

Press > 1 second

‘RANGE+’

[0.001 Hz ; 0.01 Hz] 0.001 Hz 0.01 Hz

[0.01 Hz ; 0.1 Hz] 0.01 Hz 0.1 Hz

[0.1 Hz ; 1 Hz] 0.1 Hz 1 Hz

[1 Hz ; 10 Hz] 1 Hz 10 Hz

[10 Hz ; 100 Hz] 10 Hz 100 Hz

[100 Hz ; 1 kHz] 100 Hz 1 kHz

[1 kHz ; 10 kHz] 1 kHz 10 kHz

[10 kHz ; 100 kHz] 10 kHz 100 kHz

[100 kHz ; 1 MHz] 100 kHz 1 MHz

GX 305 [1 MHz ; 5 MHz]

GX 310 [1 MHz ; 10 MHz]

1 MHz

GX 305 5 MHz

GX 31010 MHz

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GX 320 Description

GX 320 Description

Presentation

Specifications

nt face

Fro

The GX 320 is a standard alternating signal generator, using the DDS (Direct Digital
Synthesis) technology. It may simulate the operation and the specifications of various
electronic systems. It also includes a frequency meter input. The GX 320E is remote
programmable via an USB or ETHERNET link.

- Wave form: sinusoidal, square, triangle, logical, TTL, continuous

- Wave frequency: 0.001 Hz to 20 MHz for the sinusoidal and square

0.001 Hz to 2 MHz for the triangle

- INT and EXT sweep: adjustable from 0.001 Hz to 20 MHz

- EXT frequency meter: from 5 Hz to 100 MHz

- AM modulation: internal (1 kHz) and external (< 5 kHz)

- FM modulation: internal (1 kHz) and external (< 15 kHz)

- Frequency Shift Keying FSK: internal (1 kHz) and external (< 1 MHz)

- Phase Shift Keying PSK : internal (1 kHz) and external (< 1 MHz)

- BURST function: internal or external (< 1 MHz)

- GATE function: external (< 2 MHz)

- Function to synchronise several generators

- 15 configurations can be saved and recalled

Back lit LCD display (124 x 43 mm)

Coding wheel

ON / STANDBY

1. 2. 3. 4.

Terminals

1.

2.

3.

4.

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III - 12 Function Generators

MAIN OUT

- Main output

VCG IN

- External SWEEP, MODUL, SHIFT K, BURST piloting signal input
SYNC CTRL

- Master synchronisation output signal in SYNC function

- Slave synchronisation input signal in SYNC function
SWEEP OUT in SWEEP or SHIFT K INTernal source

- Sweep piloting output signal for FSK and PSK

TTL OUT

- TTL output
SYNC M CLK

- in SYNC function, master clock output

EQ EXT

FR

- Frequency meter input
SYNC S CLK

- in SYNC function, slave synchronisation clock input
GATE IN

- GATE piloting input signal

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GX 320 Description

connection

Network

Connection

working

Network

Conne

ct

ion

working

GX 320 Description (contd.)

Rear panel

GX 320

USB type B connection

Indication of the

voltage

Display

GX 320E

ETHERNET

Indication of the

voltage

USB type B

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GX 320 Description (contd.)

Signal selection:

• sinusoidal

• square

• logic

• triangle

• continuous

current waveform indicator

Display of the current frequency phase:

• Freq, Freq

• Phase, Phase

• Time (sweep period, pulse period)

• Num : number of pulses

START

Frequency display (digit height 20 mm)

and Freq

, Phase

START

GX 320 Description

END

END

Underscores:
Indicate to which digit the wheel increments apply during
adjustment.

Unit of measure display:

• degree

• MHz, kHz, Hz

• seconds

Function selection:

• continue

• Shift Key

• sweep

• modulation

• frequency meter

• synchronisation

• Burst

Current function indicator

Duty cycle value display

Amplitude value display

Offset value or DC level value display

OFFSET type display

DUTY type display
AMPLITUDE type display

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GX 320 Description

GX 320 Description (contd.)

HIGH / LOW level logical type display

INTernal / EXTernal source selection

Mode display:

• AM / FM Modulation

• LINear / LOGarithmic sweep

• Master / Slave synchronisation

• Shift key Frequency / Phase

Indication that the MODE key is assigned:

• to triggering the adjustment step when calibrating

• to the manual triggering of a set of pulses in BURST mode

• to triggering the selected test in Autotest mode

Sawtooth or triangle sweep type

Modulation rate display AM 20 % or 80 %

GATE mode activated display

Master synchronisation activated display

Slave synchronisation activated display

For the synchronisation function: indicates that the frequency and phase
adjustment on the slave are restricted by the master.

• During calibration the key is assigned to saving the settings.

• In normal mode selects save configuration mode

Selects configuration recall mode

Selects configuration clearing mode

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GX 320 Description

GX 320 Description (contd.)

Keys 

Keys with the  symbol have a specific action when pressed for more than
1 second.

• The white keys may have a back light:

MAIN OUT

MAIN OUT

• The other keys can be:

unlit

lit

blinking

Appliance under power but not turned on (red)

Appliance turned on (green)

Key lit  MAIN OUT exit activated

Blinking key  MAIN OUT and GATE functions activated

 keys not assigned to the wheel adjustment or having no

action

 the corresponding adjustment is assigned to the wheel.

 the corresponding adjustment can be assigned to the

wheel.

Keys pressed for

less than 1 second

WAVEFORM

 Each time the WAVEFORM or FUNCTION is changed the keys that

can be assigned to the wheel adjustment blink for 4 seconds; if no

keys are used at this time the frequency adjustment (Freq or
Freq

WAVEFORM keys:
Selects the waveform to be generated

Saves the current configuration or saves the settings when calibrating

Recalls or clears a saved configuration

) is assigned to the wheel.

START

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GX 320 Description

GX 320 Description (contd.)

Keys pressed for

less than 1s (contd.)

LOGIC LEVEL

FUNCTION

Validation or not of the wave on the MAIN OUT BNC.

Adjustment of the wave duty cycle (square, triangle) using the wheel.

Adjustment of the output wave amplitude using the wheel.

• Offset adjustment using the wheel.

• Adjustment of the DC level if the continuous waveform is selected.

LOGIC waveform selected: adjustment of the high or low wave level using the
wheel.

FUNCTION keys:
Selection of one of the 7 available functions.

SHIFT K, or SWEEP, or MODUL or BURST functions activated: selection of
the INTernal or EXTernal command signal.

• SHIFT K o

a specific function mode (see Function list and adjustment paragraph).

• BURST function and EXTernal source activated: manual triggering of a

set of pulses.

• calibration: triggers the selected adjustment step.

• Autotest: triggers the selected test.

• SWEEP activated with INTernal source: assignment of the wheel to the

desired timing adjustment to carry out a frequency sweep; then, by
pressing several times, selection of the digit on which to apply the
increment.

• BURST function active: assignment of the wheel to the adjustment of the

number of pulses or the burst generation period (INT source); then, by
pressing several times, selection of the digit on which to apply the
increment.

Division or multiplication by 10 of the current frequency value (decade change).

• Assignment of frequency adjustment to the wheel; then, by pressing

several times, selection of the digit on which to apply the increment.

• SWEEP or MODUL FM or FSK activated: same functions with the

FreqSTART and Freq

r SWEEP or MODUL or SYNC functions activated: selection of

frequencies.

end

• SYNC function activated: adjustment of the de-phasing between the two

generators using the wheel.

• PSK function activated: by pressing several times, adjustment of the

PhaseSTART or Phase

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using the wheel.

end

GX 320 Description (contd.)

Keys pressed for

more than 1 second

Pressing for more than 1 second sets the GATE function.

Pressing for more than 1 second forces the duty cycle to 50 %.

Pressing the key for more than 1 second switches from a peak to peak
amplitude display to an RMS (root mean square) display.

Pressing the key for more than 1 second forces the offset value to 0.

LOGIC LEV EL

LOGIC LEVE L

LOGIC LEVE LLOGIC LEVE L

Pressing the key for more than 1 second assigns the LCD contrast adjustment
to the wheel.

GX 320 Description

BURST function activated, INTernal source. Pressing the key for more than 1
second is used to switch the number of pulses Num in the pulse generation
period Time, and vice versa.

These keys assign the selected frequency to the start or end of the current
range.

Ranges

[0.001 Hz ; 0.01 Hz] 0.001 Hz 0.01 Hz

[0.01 Hz ; 0.1 Hz] 0.01 Hz 0.1 Hz

[0.1 Hz ; 1 Hz] 0.1 Hz 1 Hz

[1 Hz ; 10 Hz] 1 Hz 10 Hz

[10 Hz ; 100 Hz] 10 Hz 100 Hz

[100 Hz ; 1 kHz] 100 Hz 1 kHz

[1 kHz ; 10 kHz] 1 kHz 10 kHz

[10 kHz ; 100 kHz] 10 kHz 100 kHz

Press > 1 Second

‘RANGE-’

Press > 1 second

‘RANGE+’

[100 kHz ; 1 MHz] 100 kHz 1 MHz

[1 MHz ; 10 MHz] 1 MHz 10 MHz

[10 MHz ; 20 MHz] 10 MHz 20 MHz

For the SWEEP or MODUL FM or FSK functions pressing the key for more
than 1 second is used to switch between Freq

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START

and Freq

and vice versa.

END

General Commands

General Commands

Commissioning

Check that your instrument is compatible with the mains network voltage
(see the label at the back of the instrument), that the power supply cable
is not damaged and that it is earthed.

The power supply cable plug is used as a cut off point, connect the device
to a mains outlet that is easily accessible and is earthed in order to
ensure safety.

Four start-up modes are possible depending on the key
keys - used:

1. Normal Mode:

The instrument starts up using the last used configuration. By default the
factory configuration is restored.

The key becomes:

2. Version Mode:

– or combination of

FUNCTION

+

MAIN OUT

+

The instrument starts up in Version mode and displays the current software
version number and date.

+

The key becomes: (See Display of the software version).

3. Calibration Mode

The instrument starts up in Calibration mode with the selection of the
calibration to be run: automatic mode CAL_AU, by default.

The key becomes: (See automatic calibration).

4. Autotest Mode:

The instrument starts up in Autotest mode with the selection of the test to
be run: automatic mode tSt_AU by default.

The key becomes: (See Autotest).

:

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General Commands

General Commands (contd.)

Stop

Whatever the mode, pressing this key puts the instrument on STANDBY.
When pressed while in Normal mode the context is saved:

- current settings in use for signal generation when the instrument was
stopped,

- settings for other functions that may have been changed.

The key becomes:

 Each time Normal mode start-up is used all the settings are reloaded.

In the event of a power failure (or if the power cable is unplugged …), the
instrument restarts using the last backup (backup made the last time the device
was turned off using the ON/STANDBY key).

In the event of an error the default configuration is loaded:

• Signal sinusoidal

• Function CONTinuous

• Frequency 1 kHz

• Amplitude 1 Vpp

• Offset 0 V

• Output MAIN OUT ON not active

• No adjustments assigned to the wheel.

Activating the

N OUT terminal

MAI

MAIN OUT

MAIN OUT

The key becomes: .

 At start-up the MAIN OUT terminal is always de-activated.

Pressing the key activates the terminal and the key lights: .
On the GX 320: the key may blink when the GATE function is activated (see

GATE function).

De-activation of the MAIN OUT terminal, the key is no longer lit: .

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General Commands

n the 4 seconds following the function validation the wheel is

General Command (contd.)

Setting the screen contrast

LOGIC LEVEL

1s or 1s

Selection of the
instrument function

FUNCTION

The display shows: .

The key becomes:

Adjustment of the contrast value from 0 to 99 using the coding wheel.

Exiting from this mode is made by pressing another key. The frequency display
returns to the screen and the possible associated keys blink.

The key becomes: .

The contrast value is memorised in the device configuration once it is turned off
(see left margin) or when the configuration is saved (GX 320).

Pressing once displays the list of functions available on the device in the top

.

FUNCTION

right hand corner:
The cursor indicates the selected function.

Pressing again moves the cursor towards the top or bottom to select another
function.
If, after 2 seconds, no keys have been pressed or when another key is pressed,
the selected function is validated and is the only one remaining displayed:

When the function has been validated the keys that can be assigned to the
wheel blink until one of them is selected; the key then lights up.

If no keys are used i
automatically assigned to frequency setting
(Freq or Freq

depending on the function).

START

(GX 310) (GX 320).

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General Commands

General Commands (contd.)

Software version display

+

The following screen is displayed:

i.e. the 23rd November

for version number: 1.00

for the version date:

2008

Exit Version mode.

The key becomes: .

for GX 305

for GX 310

for GX 320

for Programmable

Automatic calibration

Calibration mode

FUNCTION

+

Entering

The device has an automatic function that can be used to calibrate signal
generation.

This function can be triggered:

- automatically (all settings are run automatically) or

- manually (individual selection and run of settings).

No specific wiring is needed for this function.

For optimal calibration the device must be at operating temperature
(switched on for 30 minutes) before running calibration.
In addition, when in manual mode it is recommended to respect the
running order of the calibration steps.

Entry into this mode is the CAL.AU. automatic mode. The display is as below:

Switching to manual mode is done by turning the wheel and selecting the
calibration step to be run individually.

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General Commands

that the adjustment settings may have changed and

General Commands (contd.)

Selecting the calibration step to run:

• CAL.AU : automatic calibration (all settings are triggered automatically)

• CAL.00 : cancels offsets for sine and triangle signals

• CAL.01 : cancels offsets for square and LOGIC signals

• CAL.02 : calculates gains for the DC level offset setting

• CAL.03 : cancels the secondary offset for square and LOGIC signals

• CAL.04 : calculates gains for amplitude setting for sine, triangle, square

and LOGIC

• CAL.05 : calibrates the duty cycle for square and LOGIC

• CAL.06 : sets AM and FM external modulation

• CAL.07 : sets AM modulation for square and LOGIC signals

Running

adjustments

(GX 305/310)

(GX 320)

Pressing the key triggers automatic calibration or the selected calibration step.
The display shows:

for automatic (then the adjustments are

displayed in order) or

in manual mode.

At the end of the run two situations are possible: the adjustment either succeeded
or failed.

If the adjustment succeeded the display shows:

in automatic or

in manual.

The display indicates
that the changes can be saved.

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General Commands

General Commands (contd.)

Saving settings

(GX 320)

(GX 305/310)

Calibration mode

Exit from

In the event of an error the automatic calibration stops at the step in error, it
then switches to manual mode.

The display shows:

In the event of repeated errors contact your CHAUVIN-ARNOUX representative
(see p. 5).

Pressing saves the calibration.

The display is cleared once the backup is made. It reappears if the
calibration is changed.

Exit this mode using this key.

The key becomes: .

 To save settings a data backup should be made (see abo

exiting the mode, otherwise the settings are lost and the previous
settings are re-loaded at start-up.

ve) before

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General Commands

General Commands (contd.)

Instrument Autotest

Wiring needed

The device has an automatic electronics test function. This feature can be run
automatically (all tests run automatically) or manually (individual selection and
running of tests).

These tests require specific wiring of the device’s input/output terminals.
Two wirings are needed.

When needed they are indicated by the following messages:

for wiring n° 1:

(GX 305/310)

(GX 320)

(GX 305/310)

(GX 320)

for wiring n° 2:

(GX 305/310)

(GX 320)

Once the wiring has been made pressing the key continues the test.

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General Commands

scrolls through all segment, even segment, odd segment

General Commands (contd.)

Entering

AUTOTEST mode

MAIN OUT

+

(GX 305/310)

MAIN OUT

+

(GX 320)

By default this mode is entered using the automatic mo
the following:

Switching to manual mode is done by turning the test step selection wheel and
running individually.

Selection of the test step to run:

• tSt.AU : automatic test (all tests automatically sequenced)

• tSt.00 : LCD test (

displays by pressing the MODE key)

• tSt.01: keyboard and key light test

(you must press all the keys except , each time a key is
pressed an LCD segment is cleared).

N° 1 wiring is needed:

• tSt.02: frequency meter test

• tSt.03: GATE IN test (GX 320)

• tSt.04: CTRL IN test using SYNC function (GX 320)

• tSt.05: FM modulation test (GX 320)

• tSt.06: external AM test (GX 320)

• tSt.07: Reset DDS pilot test

• tSt.08: DDS FS register pilot test (frequency commutation)

• tSt.09: DDS PS register pilot test (phase commutation)

• tSt.10: triangle duty cycle test

N° 2 wiring needed:

• tSt.11 : CTRL OUT test using SYNC function (GX 320)

• tSt.12 : SWEEP OUT test

de tSt.AU. The display is

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General Commands

in automatic mode (then scrolls through

General Commands (contd.)

Running the tests

Pressing the key triggers the automatic test or the selected test step.
The display shows:

(GX 310)

(GX 320)

the tests) or

At the end of the run 2 situations are possible: the test was successful or the test
failed.

in manual mode.

If the test succeeded the display shows:

in automatic mode or

in manual mode.

If the test failed the automatic test stops at the failed test step or switches to
manual mode. The display shows:

If the error persists contact your MANUMESURE representative (see p. 5).

Exiting AUTOTEST

Pressing this key exits Autotest mode.

The current test is stopped and the instrument switches to STANDBY, the key

becomes:

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.

General Commands (contd.)

Saving a configuration (GX 320)

The GX 320 can save and reload user configurations.
A total of up to 15 files can be saved.
This backup is permanent (the data is saved even if the instrument is powered

down).

Enters the configuration management mode.

is displayed on the screen with the current file number:

General commands

if file 3 is empty;

if file 3 already contains a configuration

the data (other than frequency) is displayed on the screen.

Pressing another key than or exits the mode without saving.

Selects files from SEt.01 to SEt.15. The screen is updated with the data from
the selected file.

Pressing the key again saves the current configuration in the selected file.

The display returns to its pre-backup status and the display is cleared.

When saving the content of the selected file is overwritten by the content
of the current configuration without any warning messages.

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General Commands

General Commands (contd.)

Reloading a configuration (GX 320)

The GX 320 can reload 16 saved configurations:

• 15 user configurations,

• plus the default configuration (“factory” configuration see §. Stop).

Entering configuration reload mode.

is displayed on the screen with the current file number:

if file 3 is empty.

if file 3 contains a configuration the data

(except frequency) is displayed on the screen.

Pressing a key other than exits the mode without making any changes.

Selects a file from SEt.00 to SEt.15 (Set.00 is the factory configuration). The
screen is updated using the data from the selected file.

Pressing the key again reloads the configuration from the selected file.

If the file is empty or inconsistent the operation is cancelled:

• the settings used before the reload operation are maintained,

• the initial display is shown.

If the selected file is valid the configuration it contains is loaded and the display
is updated with its data.

is no longer displayed indicating that the configuration reload mode has

been exited.

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General Commands (contd.)

Clearing a configuration (GX 320)

Clearing a user configuration file (Set.01 to Set.15) consists in saving a null
configuration in the file.

This configuration is shown by displaying the file number only during file
selection.

Reloading a null configuration has no effect (the existing settings are kept
active).

General commands

 It is not necessary to clear a file before saving a con

saving the configuration overwrites the data in the file.

Enters configuration mode.

is displayed with the current file number:

if file 3 is empty

if file 3 already contains a configuration

the data (except frequency) is displayed on the screen.

Pressing a key other than
changes.

or exits the mode without making any

figuration since

Selects file erase mode.

is added to the display:

Pressing the key again unselects the file erase mode.

Selects a file from SEt.01 to SEt.15. The screen is updated with the data from
the selected file.

Pressing the key again saves a null configuration in the selected file and returns
to the current configuration display.

and are cleared from the screen.

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Generation of basic periodic signals

Generation of basic “CONTinous” periodic signals

Available output waveforms

Waveform selection

GX 305/310

The instrument generates the following waveforms:

• sine

• square

• TTL logic

• triangular

• continuous.

Sine waveform

Square waveform
Logic output waveform

Triangular waveform

Continuous waveform

GX 320

WAVEFORM

WAVEFORM

Each time a key is pressed the symbol is displayed on the screen and the keys
that can be assigned to the wheel blink.

Pressing once displays the list of available waveforms at the top left of the screen:

The cursor indicates the current waveform.

Pressing again moves the cursor up or down to select a new
waveform.

If the keys are not pressed for 2 seconds or if another key is pressed the
selected waveform is validated and remains displayed:

When the waveform is validated the keys that can be assigned to
the wheel blink until one of them is selected; this key is then lit.
If no key is pressed within 4 s of validation the wheel is
automatically assigned to frequency adjustment (Freq or
Freq

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START

).

Generation of basic periodic signals

Generation of basic “CONT” periodic signals (contd.)

Adjusting signal frequency

Entering the

5 significant digits

or

Frequency is set in two steps:

• Entry of the five significant digits

• Setting the decimal point and the unit multiplier

The coding wheel and the following key can be used to enter the 5 significant
di

gits.

Assign frequency setting to the wheel. The:

Value adjustment.

By pressing several times, the digit from which wheel increments are added is
selected.

key lights.

 By default the digit to which increments are applied is the unit digit

(extreme right). This setting is programmed each time the instrument
is started up.

Positioning the

decimal point and

the unit multiplier

Entry short cuts

1s

1s

These keys position the decimal point and the unit multiplier.

Assigns the minimum value for the current range
(see Pressing keys for more than 1 second in the GX description paragraph).

Assigns the maximum value for the current range
(see Pressing keys for more than 1 second in the GX description paragraph).

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Generation of basic periodic signals

Generation of basic CONT periodic signals (contd.)

 Example 1:

1st possibility

The wheel is not assigned to a setting (FREQ not lit or blinking),

the current frequency value is: .

We want to enter: .

The FREQ key lights: .

The display shows:

The display shows: .

The display shows: .

25

2nd possibility

The display shows: .

The display shows: .

The display shows: .

The FREQ key lights: .

The display shows: .

The display shows: .

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Generation of basic periodic signals

Generation of basic “CONT” periodic signals (contd.)

The display shows: .

2

The display shows: .

The display shows: .

5

3rd possibility

2500

 Example 2:

The display shows: .

The FREQ key lights.

The display shows:

The display shows: .

The display shows: .

The wheel is not assigned to any settings (FREQ key unlit),

the current frequency value is: .

.

We want to enter: .

The FREQ key lights: .

1s

The display shows:

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.

Generation of basic periodic signals

Generation of basic “CONT” periodic signals (contd.)

Setting the duty cycle

or

The duty cycle can only be adjusted for square, logic or triangle forms using the
“CONTinuous” function.

The setting can be limited depending on the signal frequency.

Signal Frequency Possible adjustments

Square
Logical

Triangle

Assignment of the duty cycle to the wheel. The key lights: .

Setting the value.

≤ 200 kHz

200 kHz < F ≤ 1 MHz

F > 1 MHz

F < 0.2Hz

0.2Hz ≤ F ≤ 1 kHz

1 kHz < F ≤ 10 kHz

F > 10 kHz

10 to 90 %
20 to 80 %

50 %

50%
10 to 90 %
30 to 70 %

50 %

Setting the signal

litude

amp

or

Vpp/Vrms display

 1s

 1s

Forces the duty cycle value to 50 %.

The duty cycle is limited by the frequency, turning the wheel may have no
effect.

Amplitude indications are given in open circuit.
Under 50

Assignment of amplitude adjustment to the wheel. The key lights: .

Adjustment of the Vpp or Vrms value depending on the selected display.

Switches from Vpp to Vrms display and vice versa

The variation is from 0 to 20 Vpp in open circuit.

ΩΩΩΩ

, amplitudes are divided by 2.

The sum of continuous voltage + alternating voltage cannot be >>>> ± 10 V.

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Generation of basic periodic signals

Generation of basic “CONT” periodic signals (contd.)

Setting the offset and DC level

or

 1s

Setting signal logical levels

or

Assignment of offset adjustment to the wheel. The key lights.

Value adjustment.
The variation field is from -10 V to +10 V maximum in an open circuit.

Forces the offset value to 0.

The sum of continuous voltage + alternating voltage cannot be >>>> ± 10 V.

This function is only available if the “LOGIC” waveform has been selected.

Assignment of the logic signal low level to the wheel.

The key lights.
The "Adj.LO" message displays instead of the frequency value:

By pressing several times the high or low level is selected, "Adj.HI" is displayed
for high level adjustment:

Adjustment of the selected value.

The field of variation for these levels is from -10 V to +10 V by 100 mV intervals.

high level is always greater than or equal to the low level.

The

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Fonction SHIFT K

TTL output

Shift Keying function “SHIFT K” (GX 320 only)

The SHIFT KEY function can work with the signal frequency (FSK) or phase
(PSK):

- “FSK” is a frequency commutation piloted either INTernally or EXTernally:
switching from Freq

START

to Freq

and vice versa.

END

INTernal FSK:

Channel1: MAIN OUT

Channel2: VCG IN Sweep out

Connections

- “PSK” is a phase jump with value Phase

START

and Phase

, piloted by a

END

command signal that can be INTernal or EXTernal.

INTernal PSK

Channel1: MAIN OUT

Channel2: VCG IN Sweep out

:

At each change in signal status the programmed phase value (Phase
Phase

is added to the current phase.

END)

• With an INTernal source the command signal has a frequency of 1 kHz. It

can be viewed on the generator SWEEP OUT terminal.

• With an EXTernal source the pilot signal is a TTL signal (0 - 5 V) with a

frequency of < 1 MHz from the generator VCG IN terminal.

Main output signal

TTL input command signal from an

EXTernal F < 1 MHz

Output command signal from an

INTernal source

signal

START

or

FSK mode selection

Pressed successively, “F” mode selection (Frequency).

PSK mode selection

Pressed successively, “P” mode selection (Phase).

Selection of the source

Pressed successively, source selection:

INTernal

or

EXTernal .

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SHIFT K Function

Shift Keying “SHIFT K” function (contd.)

Setting frequencies in FSK mode

or

 1s or  1s

 1s

Setting phases in PSK mode

or

Freq

display and assignment of adjustment to the wheel.

START

The key lights: .

Freq

display and assignment of adjustment to the wheel.

END

The key lights: .

Pressed successively selects the digit from which the increment will be
applied.

Adjustment of the selected value.

Passage from Freq

adjustment to Freq

START

adjustment.

END

Assignment of Phase

adjustment to the wheel.

START

The key lights: .

1s or 1s

Assignment of Phase

The key lights: .

Adjustment of the selected value.

e field of phase variation is of -180° to +180° b y intervals of 1°.

Th

Pressed successively assigns Phase
wheel.

 1s

Other settings

Forces the phase being set to 0.

See “CONT” function.

adjustment to the wheel.

END

or Phase

START

adjustment to the

END

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SWEEP Function

SWEEP frequency scan function

Connections

Remarks

SWEEP is a frequency scan from Freq

START

to Freq

piloted:

END

•either INTernally by the generator following a linear or logarithmic formula

and a saw tooth or triangle variation.

The user can choose a scan time from 10 ms to 100 s.

•either EXTernally using a voltage of ± 10 V applied to VCF IN (GX 305/310)

or VCG IN (GX 320) with a frequency < 15 kHz.

•Depending on the values of Freq

in ascending or descending order.

be

START

and Freq

the frequency scan will

END

When using EXTernal SWEEP the signal level is read at a frequency of 60 kHz.
This amplitude (coded on 256 values) is then converted into frequency.

When using INTernal SWEEP, the scan is made using a maximum of 256
values.

Main

modulated

output signal

- in EXT: Pilot signal ± 10 V

- in INT: SWEEP OUT

Input:

TTL OUT

Selection of scan mode

Assignment

ence using

sequ
INTernal source

 Pressed successively this key selects one of the following scan modes:

Display Description Channel1: MAIN OUT,

Channel2: SWEEP OUT

Linear rule,
triangular variation

Linear rule,
saw tooth variation

Logarithmic rule,
triangular variation

Logarithmic rule,
Saw tooth variation

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SWEEP Function

)

SWEEP frequency scan function (contd.)

Assignment

sequence using

EXTernal source

INTernal source

EXTernal source

Display Description Channel 1:

MAIN OUT(F

Channel 2:
Modulation: SINE, 1 kHz, 10Vpp

Linear rule between
the command signal
and the generated
frequency

Logarithmic rule
between the command
signal and the
generated frequency

= 1 kHz, F

start

= 100 kHz

end

 A SWEEP OUT signal is available on the VCF IN BNC (GX 305/310)
or VCG IN (GX 320).
It is a proportional signal with a generated frequency, amplitude from 0 to 2V.

 The generated output frequency is proportional (according to a linear or
logarithmic rule) to the voltage on VCF IN (GX 305/310) or VCG IN (GX 320).

The command signal is sampled on 8 bits using a frequency of 60 kHz.

 For -10 V: the output frequency F ≅ Freq
For 10 V: F ≅ Freq

END

START

Selecting the scan source

Setting the START / END frequencies

or

1s or 1s

Pressing the key successively selects the INTernal source or the

EXTernal source .

Displays Freq

and assigns adjustment to the wheel.

START

The key lights: .

Displays Freq

and assigns adjustment to the wheel.

END

The key lights: .

Pressing successively selects the digit from which the increment will apply.

Adjusts the selected value.

1s

Switches from setting Freq

to setting Freq

START

END

.

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SWEEP Function

SWEEP frequency scan function (contd.)

Setting the scan time using INTernal source

Displays the Time and assigns adjustment to the wheel.

or

Other settings

The key lights: .

Pressed successively selects the digit to which the increment will apply.

Adjusts the value using the wheel.

See the CONT function.

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MODUL Function

MODUL Modulation function (GX 320 only)

The MODUL function modulates a carrier frequency (FM) or amplitude (AM).

The modulating signal can be:

• either internal (INTernal source, sinusoidal 1 kHz signal)

• or on VCG IN, for an EXTernal source.

The carrier specifications are defined in the same way as the CONT function.

Using an EXTernal source the signal must have an amplitude of ± 10 Vpp
and a frequency of < 15 kHz (FM) and < 5 kHz (AM).

Depending on the voltage the modulation is as follows:

- AM: the output signal amplitude is typically
100 % for -10 V
50 % for 0 V
null for 10 V

- FM: the output signal frequency is typically
Freq

(Freq

Freq

for -10 V

start

+ Freq

start

for +10 V

end

) / 2 for 0 V

end

Remarks • For AM: with LOGIC and square signals modulation is digital:

Connections

Selection of modulation source

the modulating signal is read at a frequency of 150 kHz. This
amplitude (256 values) pilots the output signal amplitude.

For the other types of signal modulation is analogue and the
modulating signal cannot exceed 5 kHz.

• For AM: with the SINE and TRIANGLE signals, TTL OUT is not available

• For FM: modulation is digital: the modulating signal level is read at a

frequency of 65 kHz.
This amplitude (256 values) is then converted into frequency.

Modulated output

signal

Pilot signal

± 10 V; F < 5 kHz

TTL OUT

Pressed successively selects the INTernal source or the EXTernal source

.

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MODUL Function

MODUL Modulation function (GX 320 only, contd.)

Selection of the AM/FM modulation mode

Pressing successively selects the following modulation modes:

INTernal source

EXTernal source

Display Description

20% amplitude

modulation

80% amplitude

modulation

Frequency

modulation

Display Description

Amplitude

modulation

Frequency

modulation

Setting START / END FM frequencies

Displays Freq

or

and assigns adjustment to the wheel.

START

The key lights: .

1s or 1s

Displays Freq

and assigns the adjustment to the wheel.

END

The key lights: .

Pressed successively selects the digit to which the increment will be applied.

Adjusts the selected value.

Switches from setting Freq

 1s

to setting Freq

START

END

.

Other settings

See CONT function.

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Fonction FREQ

Frequency meter function “FREQ”

Selecting the FREQ function activates measurement of the frequency of the
signal input to the FREQ EXT terminal.

The frequency meter can measure frequencies from 5 Hz to 100 MHz with the
following precision:

< 50 mV sensitivity F ≤ 30 MHz
< 60 mV sensitivity for 30 MHz < F ≤ 80 MHz
< 90 mV sensitivity for 80 MHz < F ≤ 100 MHz

The maximum amplitude (*) of the measured signal is:
300 V sensitivity from 5 Hz to 5 kHz
30 V sensitivity from 5 kHz to 1 MHz
10 V sensitivity above this value
(*) signal with a 50% duty cycle.

Measurement stabilisation time depends on the input frequency:

≤ 1 s from 5 to 20 Hz (≥ 1 measurements per second)
≤ 100 ms from 20 to 400 Hz (2 measurements per second)
≤ 40 ms from 400 Hz to 100 MHz (2 measurements per second)

Connections

Indication of the 300 V protection (50 - 60 Hz) CAT I

FREQ EXT terminal

for the measured

signal

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SYNC Function

r

SYNC Synchronisation Function (GX 320 only)

The SYNC function is used to synchronise several GX 320 set up in a cascade

in order to create a variable phase multiple signal generator.

The frequency resolution of this function is: 37 mHz, the clock frequency of the
DDS is set at 10 MHz.
To limit the sampling effect the maximum frequency of the output signal is set at
100 kHz.

The Master generator supplies the Slave generators with the clock (Clk) used to
generate the signals (10 MHz) and a synchronisation signal (Ctrl). This allows
all the generators to start at the same time and control their phase offset.

Connections

Control signal (Ctrl): Connect the Slave VCG IN BNCs to the Master.

Clock signal (Clk): Connect the slave FREQ_EXT BNCs to the Maste
TTL OUT.

Master

Slave1

Slave2



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Function Generators X - 45

ring signal generation disconnecting one of the Ctrl or Clk cables

Du
desynchronises the generators.

To resynchronise them use the master’s ‘MAIN OUT ON/OFF’ key to
deactivate and then reactivate signal generation.

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SYNC Function

SYNC Synchronisation Function (GX 320 only, contd.)

Selection of the Slave / Master mode

Pressed successively selects S mode (Slave):

or M (Master):

Adjusting phase offset

or

 1s

Phase offset can be set on the master and on the slave (if it is not locked).
Whatever the mode selected (M/S) the phase offset is that of the slave(s)
related to the master.

The phase offset entered on the master is applied to all the slaves whereas the
phase offset entered on the slave is limited to that slave:

Phase offset (slave/master) = entered phase offset

Displays phase offset and assigns the adjustment to the coding wheel.

The key lights.

Value adjustment.
The phase is in degrees and can have values between -180° C and
+180° C, varying by 1°.
The master mode phase is reversed in relation to the slave mode.

Forces the phase to 0°

+ entered phasing

master

slave

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SYNC Function

ster all adjustments are possible in real time because each

selecting waveform and adjusting frequency and phase are

SYNC Synchronisation Function (GX 320 only, contd.)

Activation of signal generation (Master)

MAIN OUT

 On the ma

change in the master commands resynchronisation of all the slaves.
As this is not possible on the slaves, changing waveform, frequency
or phase are not possible when signal generation is activated. On the
other hand as amplitude and offset have no effect on synchronisation
they remain adjustable at all times.

The slave is said to be locked: is displayed on the top right hand
corner of the slave screen(s).
In order to change the waveform, frequency or phase on the slave
you must stop signal generation on the master using its ‘MAIN OUT
ON/OFF’ key.

• on the Master:

- Activates MAIN OUT and signal generation on all devices on which MAIN
OUT is activated.

The master key lights: .

- Locking slaves:
no longer possible on the slaves.

The symbol is dispayed on the slave screen as below:

MAIN OUT

Other settings

• on the slaves:

- Activation of the associated MAIN OUT (effective signal output is only

possible if signal generation is activated on the master).

The slave key lights: .

• on the Master:

- Deactivation of MAIN OUT and halting of signal generation on all devices.

The master key is turned off: .

- The master frees the slaves: waveform selection and frequency and phase

adjustment are now possible.

The symbol disappears from the slaves.

• on the Slaves: the associated MAIN OUT is deactivated.

The slave key is turned off: .

See the CONT function.

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SYNC Synchronisation function (GX 320 only, contd.)

SYNC Function

 Example 1:

Generating three phase signals

Connect the three GX 320 generators as shown above (see Connections),
identify a master and 2 slaves and then programme the 3 devices with:

• the same frequency 1 kHz,

• the same amplitude 10 Vpp

• the same offset 0 V

• the same sine waveform

• phases 0° (master), +120° and -120°.

Activate the 3 MAIN OUTs.

On an oscilloscope view the output signals from the three devices:

Channel 1: master (0°)

Cha

nnel 2: slave1 (120°)

Channel 3: slave 2 (-120°)

 Example 2:

Fourier synthesis

A simple illustration of generator synchronisation is the synthesis of a square
signal using its first harmonics.

The square signal is broken down as follows:

f(x) = 4/π (sinx+ sin3x / 3 + sin5x / 5 + sin7x / 7 + ... sinnx / n + ...)

ere n is always an odd number.

wh

To synchronise multiple frequencies the values programmed in the DDS must
also be multiple.

We are here faced with the problem of calculation rounding and programming
resolution: it is highly probable that the direct entry on F on the master and n*F
on the slaves will not give synchronous signals.

The DDS is programmed using a 28 bit register and is piloted by a 10 MHz
clock (in the SYNC function).

The DDS frequency resolution for this function is therefore:
10 MHz / 228 = 0.037 Hz, which means that for a frequency F entered the

resulting frequency is F ± 18.5 MHz.

The formula relating the user entered frequency to the value programmed in the
DDS is the following:

Val

= ENT((Frequency

DDS

with: ENT( ) function returning the whole part of the value

x 228) / DDS_Clock + 0.5)

(Hz)

DDS_Clock = 10 MHz,

adding 0.5 rounds the value.

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SYNC Function

SYNC Synchronisation Function (GX 320 only, contd.)

Thus when you programme a frequency of 100 Hz, the programmed value is:

ENT((100*228)/107 + 0.5) = 2684 which is the equivalent of a frequency of

99.987 Hz (obtained by reverse calculation).

If you wish to programme a synchronous n*100 Hz multiple frequency you must
enter a frequency which results in a DDS programmed value of n*2684, or a
true frequency equal to n*99.987 Hz.

In our example we will generate a square 100 Hz signal using its first three
harmonics: 3 sinusoids with a frequency of 100 Hz, 300 Hz and 500 Hz and an
amplitude of A, A/3 and A/5.

For this example 3 GX 320 generators are needed:

- one Master: on which the SINE waveform is selected, amplitude 20 Vpp,

a null offset, a null phase and a frequency of 100 Hz
(or 99.987 Hz).

- Slave 1: on which the SINE waveform is selected, amplitude 6.7 V, a null

offset, a null phase and a frequency of 3*99.987 = 299.96 Hz.

- Slave 2: on which the SINE waveform is selected, amplitude 4 V, a null

offset, a null phase and a frequency of 5*99.987 = 499.93 Hz.

Connect the generators as shown in the Connections paragraph, activate the

ve outputs and then the master output (to ensure synchronisation do a

sla
master MAIN OUT OFF and then ON).

On the oscilloscope connect the device MAIN OUT (respectively Master, Slave1
and Slave 2) outputs on channels 1, 2, 3.

Select the same sensitivity of 5 V/div. on each channel (choose the weakest
frequency signal as trigger: channel 1).

On channel 4 carry out the sum of Channel1 + Channel2 + Channel3, and
observe the result:

A square signal forms: the higher the number of odd harmonics the better the
signal quality obtained.

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GATE function (GX 320 only)

ommand input

This function is only available with “CONT”, “SWEEP” and “MODUL”.

It superimposes a stop command for the alternating MAIN OUT signal
component over the current function, piloted by a TTL input to the BNC
FREQ EXT Gate in terminal.

When the TTL signal is at the 1 logical level (5 V), the alternating
component of the MAIN OUT terminal is cut.
At 0 level it is generated freely.

The GATE has no effect on the direct component of the signal.

The command takes effect in approximately 100 ns.

GATE Function

Channel 1: Main Out (sine, 1 kHz, 10 Vpp)

Channel 2: TTL Out

Channel 3: Gate In (LOGIC, 300 Hz, 10 V - 0 V)

Connections

GATE activation

MAIN OUT

 1s

MAIN OUT

 1s

GATE de-activation

MAIN OUT

 1s

Main output

Function activation, the

TTL OUT

output

indication is displayed, the MAIN OUT

GATE c

signal

terminal remains activated

The key blinks:

.

Pressing the key for more than 1 second does not activate the MAIN OUT

terminal but only the GATE function :the key remains unlit.

Function is de-activated and the is cleared, the MAIN OUT terminal
remains active.

The key lights: .

MAIN OUT

Function de-activation and the

indication is cleared, the terminal is

still not activated: the key remains unlit.

 1s

Remark

At each function change (CONT,

SHIFT K, SWEEP, MODUL, FREQ, BURST

or SYNC), the GATE function is de-activated.

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BURST Function

Num = n

umber of pulses

TTL

signal on

VCG_IN

BURST Pulse burst function (GX 320 only)

The BURST function generates sets of pulses:

• Using an INTernal source the user must enter a generation period and

the number of pulses to generate.
The number of pulses Num is automatically limited so that the number

cannot be greater than the number of pulses a period can contain.

Num = number of pulses

Time = generation period

• Using an EXTernal source the pulse bursts are piloted:

- either by an external TTL with a frequency of less than 10 kHz on VCG
IN

 Example

Connections

- or manually by pressing the ‘MODE’ key.

The minimum authorised window time is 2 µs: the number of pulses is defined
as follows:

Num

≥ F*2µs where Num

min

(whole

n

mi

number ≥ 1) is the minimum number of

authorised pulses and F is the programmed
pulse frequency.

 Changing the frequency can cause the modification of the

programmed Num value in order to obey this rule.

if F = 2.6 MHz, then F * 2 µs = 5.2  the minimum authorised value for NUM
= 6.

if F = 2 MHz, then F * 2 µs = 4  the minimum authorised value for NUM

MAIN OUT

in EXT:

TTL command input

TTL OUT

min

min

= 4.

Selection of the BURST source

Pressed successively selects the source:

INTernal

EXTernal

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or

.

BURST Pulse burst function (contd.)

s

BURST Function

Setting the number of pulses Num

or

 1s

Setting the generation period using an INTernal source

The pulse number value (Num) can be limited in INTernal source by the
value of the entered period (Time).

In both cases (INTernal or EXTernal), the Num
avoid having a window of less than 2 µs (see above).

Display of the number of pulses Num and assignment of the adjustment to
the wheel.

The key lights: .

Pressed successively selects the digit to which the wheel increments will be
applied.

Value adjustment.

Pressed successively selects the digit to which the wheel increments will be
applied.

Using an INT source pressing successively for more than 1 second switches
from Num to Time and vice versa, otherwise selects Num setting.

value is set in order to

min

 1s or  1

 1s

 1s

Manual triggering using EXTernal source

Displays the Time and assigns the wheel to adjustment.

The key lights: .

Pressed successively switches from Num to Time.

Pressed successively selects the digit to which the wheel increments are
applied.

Value adjustment.

Switches from Num to Time and vice versa.

Pressing this key triggers the generation of a pulse burst.

Other settings

See the CONT function.

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Remote programming

Remote programming (programmable version only) (contd.)

The programming instructions respect the IEEE 488-2 standard and the
SCPI (Standard Commands for Programmable Instruments) protocol.
The user has the possibility of having complete remote control of the device.

For more information please consult the programming guide.

Communication interfaces

ETHERNET

Connection

USB

Connecting the generator to a PC is done using either :

• an A/B type USB cable via a USB to UART converter,

• via ETHERNET Warn

If the CP210x driver is correctly installed on the PC the USB peripheral will
be recognised and a new COM port will appear in the PC’s system settings
(see the programming guide to install).

The new COM port is configured as follows:

- speed: 19200 bauds

- data bits: 8

- parity: none

- stop bit: 1

- protocol: hardware (RTS / CTS)

Once the IP address has been programmed through the GX320E-Admin
application, the GX320E can be accessed via this address.

ing ! To use the ETHERNET link, the USB

cable must be disconnected.

via USB

USB Connector

USB

Interface

cable

USB

Port

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Remote Programming

Remote programming (programmable version only) (contd.)

via ETHERNET

Crossed cable

Straight cable

 Warning ! The USB cable must be disconnected.

- Connect the crossed ETHERNET interface cable directly to the PC.

- Set the connection with a terminal (Port TELNET : 23) to the IP
address which has been defined in the generator.

Crossed

ETHERNET

interface

cable

ETHERNET connector

- Connect the generator to the PC network through a Hub with the
straight ETHERNET interface cable.

- Connect a terminal (TELNET Port : 23) to the IP address defined on
the generator.

Straight

ETHERNET

interface

cable

ETHERNET network

RJ45

plug

ETHERNET connector

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Remote programming

Remote programming (programmable version only) (contd.)

Remark

LabViews Driver LabWindows Driver

All the devices GX 310 or GX 320 – whether programmable or not –
respond to the IEEE488.2 *idn? command which returns the device
identification and version.

Reminder : The GX 305 is not programmable.

Reply format:

METRIX <instrument><programmable>,<firmware version>,<version
date>,<serial number><NL>

with: <instrument> device type GX310 / GX320

<programmable> ‘P’ if the GX 310 device is programmable

‘E’ if the GX 320 device is programmable

<firmware version> software version
<version date> software version date
<serial number> device serial number
<NL> CR character (code ASCII 13 or 0x0D)

The GX 310P and GX 320E device drivers for LabWindows and LabView
are available on the CD-ROM which contains this guide.

They can be used to interface SCPI commands for these development
environments.

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Technical Specifications

Technical Specifications

CONTinuous function

Waveforms • sine

Signal frequency

triangle
square
logic pulses (programmable high and low levels)
positive pulses (TTL level)
continuous (DC: offset)

• GX 305 : from 0.001 Hz to 5 MHz in 10 ranges (decades)

GX

310 : from 0.001 Hz to 10 MHz in 10 ranges (decades)

GX 320 : from 0.001 Hz to 20 MHz in 11 ranges (decades)

• 3 internal ranges, for DDS resolution:

F ≤ 1 kHz the DDS resolution is approx. 1 mHz
1 kHz < F ≤ 10 kHz the DDS resolution is approx. 10 mHz
10 kHz < F ≤ 20 MHz the DDS resolution is approx. 280 mHz

• Frequency display on the LCD: 5 digits (units: Hz, kHz, MHz)

• Settings: direct using the encoder, automatic range switching

• Precision: ± 30 ppm for F < 10 kHz

± 20 ppm for F ≥ 10 kHz

for sine, square, LOGIC and triangle (duty cycle 50 %)

• Temperature ratio: ± 20 ppm / ° C

• Long term derivation: ± 5 ppm / an

MAIN OUT signal • Adjustable amplitude in open circuit: from 0 to 20 Vpp

Precision: from 0.1 to 20 Vpp < 5 % from 1 mHz to 10 MHz

± 1,5 dB for F > 10 MHz (± 0.5 dB typical)

• Impedance : 50 Ω ±

• DC offset voltage: adjustable from -10 V to +10 V in open circuit (OFFSET).

3 %

Precision : ± 5 % amplitude (residual offset < ± 5 mV)

• Protection from input voltage surge: 60 VDC, 40 VAC

Sine Signal

• Distortion:

- for F ≤ 50 kHz: typical distortion rate 0.05 %, < 0.15 % max.

- for 50 kHz < F ≤ 1MHz, harmonics < -41 dB / H1

- for F > 1 MHz, harmonics < -36 dB / H1

• Measuring conditions:

- device operational for at least 1 hour

Triangle Signal

• Frequency: ≤ 2 MHz

• Linearity error: < 1 % max at 200 kHz from 10 % to 90 %

of the signal amplitude

• Duty cycle: resolution 1 %

10 to 90 % for 0.2 Hz ≤ F ≤ 1 kHz

30 to 70 % for 1 kHz < F ≤ 10 kHz

50 % for F < 0.2 Hz and F > 10 kHz

frequency error for duty cycle ≠ 50 %, < 2 %

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Technical Specifications

Technical Specifications (contd.)

Square Signal

Signal

TTL OUT Signal

SWEEP scan function

• Increase time: 7 ns typically, < 10 ns max.

• Duty cycle: resolution 1 %

10 to 90 % for F ≤ 200 kHz,
20 to 80 % for 200 kHz < F ≤ 1 MHz

50 % for > 1 MHz

• Increase time: 7 ns typically, < 10 ns max.

• VHigh, VLow adjustable at ± 10 V with a precision of ± 0.2 V

• Duty cycle: resolution 1 %

10 to 90 % for F ≤ 200 kHz
20 to 80 % for 200 kHz < F ≤ 1 MHz
50 % for F > 1 MHz

• Increase time: 5 ns typically, < 10 ns max.

• Max. admissible charge: > 10 charges TTL

• Protection from an input power surge: ± 60 VDC, 40 VAC

• Frequency resolution: 0.28 Hz, 10 mHz or 1 mHz depending on the selected

range (depending on entered Freq

• Linear Mode (LIN) or logarithmic mode (LOG)

START

, Freq

and Time)

END

EXT external scan

INT internal scan

• Scan using a signal with a frequency of < 15 kHz and an amplitude

between ± 10 V on the BNC

- ‘VCF IN’ (GX 305/310) (-10 V  Freq

- ‘VCG IN’ (GX 320) (-10 V  Freq

• Entry Impedance: 10 kΩ ± 10 %

• Freq

• Programmable scan period (Time) from 10 ms to 100 s,

START

to Freq

scan using saw tooth or triangle mode

END

and +10 V  Freq

START

and +10 V  Freq

START

END

END

)

)

resolution 10 mS

• BNC ‘SWEEP OUT’ output of approx. 2 V continuous voltage proportional to

the generated frequency

• ‘SWEEP OUT’ output impedance = 10 kΩ ± 10 %

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Technical Specifications (contd.)

MODUL modulation
function

(GX 320 only)

Technical Specifications

FM Modulation

AM Modulation

• Frequency resolution: 0.28 Hz, 10 mHz or 1 mHz depending on the selected

range (depending on Freq

START

, Freq

END

).

• Digital modulation: the modulating signal is read at a frequency of 65 kHz.

This amplitude (256 values) is then converted to a frequency.

• INTernal source: frequency modulation using a sine signal with a frequency

of 1 kHz ± 1 %

• EXTernal: modulation using a signal with an amplitude between

10 V on the BNC ‘VCG IN’ (-10 V Freq

±

and +10 V Freq

START

END

), with

a frequency of < 15 kHz

• In sine and triangle, digital modulation using a frequency modulating signal

of < 5 kHz

• In square and LOGIC, digital modulation: the modulating signal is read at a

frequency of 150 kHz. This amplitude (256 values) pilots the output signal
amplitude.

• INTernal source: modulation using a sine signal with a frequency of 1 kHz

± 1 % and an amplitude allowing to select a modulation at 20 % and 80 %

of the total programmed amplitude

• EXTernal source: modulation using an amplitude signal between

± 10 V on the BNC ‘VCG IN’, with a frequency of < 5 kHz
(-10 V  100 %, 0 V  50 %, +10 V  0 % of the programmed amplitude)

SHIFT KEY Function
(SHIFT K)

Internal FSK

External FSK

Internal PSK

External PSK

(GX 320 only)

• Frequency resolution: 0.28 Hz, 10 mHz or 1 mHz depending on the selected

range (depending on Freq

START

, Freq

END

)

• Frequency commutation using a TTL signal (0 - 5 V) 1 kHz ± 1 %

(0V  Freq

and + 5 V  Freq

START

), viewable on SWEEP OUT

END

• Frequency resolution: 0.28 Hz, 10 mHz or 1 mHz depending on the selected

range (depending on Freq

START

, Freq

END

).

• Frequency commutation using a TTL signal (0 - 5 V) with a frequency of

< 1 MHz, on the BNC ‘VCG IN’ (0 V  Freq

and + 5 V  Freq

START

END

)

• Phase resolution: approx. 0.08°, adjustable from ± 180° by 1° steps

• Phase switch using a TTL signal (0 - 5 V) 1 kHz ± 1 %

(0 V  add Phase

and + 5 V  add Phase

START

), viewable on SWEEP

END

OUT

• Phase resolution: approx 0.08°, adjustable from ± 1 80° by 1° steps

• Phase switch using a TTL signal (0 - 5 V) with a freque

on the BNC ‘VCG IN’ (0 V  + Phase

and + 5 V  + Phase

START

ncy of < 1 MHz,

)

END

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Technical Specifications

Technical Specifications (contd.)

SYNC
synchronisation
function

BURST pulse
generation function

Internal BURST

External BURST

(GX 320 only)

• Max. generated signal frequency: 100 kHz

• Phase adjustment ± 180 ° by steps of 1°

• Synchronisation precision dependent on generated signal frequency,

∆φ = ± F

x 3.6 x 10

signal

-5

(for a cable length of < 1 m)

(GX 320 only)

• Entry of the number of signal periods (impulses) from 1 to 65535

• The minimum window for the signal is: 2 µs (see details in BURST para.)

• Over 10 MHz the number of periods can vary by 1 and the phase on

SQUARE and TTL_OUT can change by 180°

• Trigger Jitter: ≤ 15 ns

• Entry of the burst period from 10 ms to 100 s with a 10 ms resolution

• Triggering of the burst using an external TTL signal with a frequency of less

than 1 MHz on the BNC ‘INPUT BURST’ or triggered manually (MODE key)

• Trigger delay of approx. 1.5 µs

GATE Function

FREQ external
frequency meter
function

Sensitivity

(GX 320 only)

• Authorisation to output the alternating component of the MAIN OUT signal using

a TTL signal with a frequency of ≤ 2 MHz on BNC ‘INPUT GATE’

(+ 5 V  Main out generated and 0 V  alternating component cut)

• Delay of approx 100 ns

• Input on the front face BNC terminal (FREQ EXT)

• External frequency measurement from 5 Hz to 100 MHz

• Max. amplitude max. (*) of measured signals:

300 V from 5 Hz to 5 kHz

30 V from 5 kHz to 1 MHz

10 V beyond these values

(*) signal with a duty cycle at 50 %

• Precision of the measured frequency: ± 0.05 % + 1 digit

• Frequency display measured on 5 digits

• < 50 mVrms for F ≤ 30 MHz

• < 60 mVrms for 30 MHz < F ≤ 80 MHz

• < 90 mVrms for 80 MHz < F ≤ 100 MHz

Measurement

stabilisation time

Inp

ut Impedance

Protection

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Function Generators XIV - 59

• ≤ 1 s from 5 Hz to 20 Hz (≥ 1 measurement per second)

• ≤ 100 ms from 20 Hz to 400 Hz (2 measurements per second)

• ≤ 40 ms from 400 Hz to 100 MHz (2 measurements per second)

• 1 MΩ // 22 pF approx.

• Max voltage. : 300 V (50 - 60 Hz) CAT I

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General Specifications

General Specifications

Environment

• Reference temperature 23° C ± 5° C 45 to 65 % RH

• Nominal usage range 5° C to 35° C 45 to 65 % RH

• Operating temperature 0° C to 40° C 20 to 80 % RH

• Storage temperature -20° C to + 70° C 10 to 95 % RH

• Use indoor

• Altitude < 2000 m

• Relative Humidity < 80 % up to 31° C

Power supply

Mains

Safety

CEM

• Voltage 120 V

• Frequency 50 - 60 Hz

• Consumption 20 VA max.

• Removable power supply cable

This device has been designed in compliance with the current CEM standards
and its compatibility has been tested in compliance with the following
standards:

Emission and Immunity: EN 61326-1 (2006)

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XV - 60 Function Generators

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Mechanical Specifications

Mechanical Specifications

Mechanical
specifications

Box

Weight

Packaging

Size (support folded):

• length 190 mm

• width 227 mm

• height 130 mm

2.850 kg

330 x 260 x 200 mm

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Function Generators XV - 61

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Supply

Supply

Delivered with the

instrument

Accessories

• Safety instructions

• Power supply cable

• USB A/B cable for programmable versions

• CD-ROM containing:

Operating instructions in 5 languages
Programming instructions in 2 languages
USB ‘CP210x USB to UART Bridge Controller’ USB Drivers
LabView and LabWindows Drivers
USBxPress application (USB port identification)
GX320E-Admin application (IP address application)

• USB

A/B cable ...............................................................................Cat. #2140.51

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XVI - 62 Function Generators

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