GW Instek GFG-3015 User Manual

Function Generator

GFG-3015

USER MANUAL

GW INSTEK PART NO. 82FG-30150MC1

ISO-9001 CERTIFIED MANUFACTURER

i

This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.

Good Will Instrument Co., Ltd.

No. 7-1, Jhongsing Rd., Tucheng City, Taipei C ounty 236, Taiwan.

Table of Contents Page

ii

1. Precautions.......................................................................................................................2

2. Product Introduction........................................................................................................5

3. Features ............................................................................................................................6

4. Specifications...................................................................................................................7

5. Front and Rear Panels ...................................................................................................10

6. Operation ........................................................................................................................18

6.1 The First Step Setup For Instrument...................................................................18

6.2 The Setup of Output Function .............................................................................18

6.3 The Setup of Frequency.......................................................................................18

6.4 The Setup of Amplitude........................................................................................19

6.5 The Setup of Offset...............................................................................................19

6.6 The Setup of Duty.................................................................................................20

6.7 The Setting of STORE...........................................................................................20

6.8 The Setting of RECALL ........................................................................................20

6.9 The SHIFT Key and Function Keys......................................................................21

6.10 Setup of LIN or LOG Sweep ...............................................................................21

6.11 Setup of AM Modulation.....................................................................................25

6.12 Setup of FM Modulation .....................................................................................26

6.13 Setup of Trigger..................................................................................................28

6.14 Setup of GATE and BURST................................................................................30

6.15 Setup of External Counter..................................................................................32

6.16 THE VCF Function ..............................................................................................34

6.17 THE GCV Output Function .................................................................................35

6.18 THE TTL Signal Output Function.......................................................................36

6.19 THE SYNC Signal Output Function ...................................................................36

6.20 Remote Control - RS232 Interface .....................................................................36

6.21 Commands Syntax..............................................................................................38

6.22 The Commands of RS-232 Serial Interface .......................................................41

6.23 The Examples of the Communication Interface Software................................44

6.24 The Error message of instrument......................................................................47

7. The Block Diagram and Description of the System .....................................................48

iii

EC Declaration of Conformity

We

GOOD WILL INSTRUMENT CO., LTD.

No. 7-1, Jhongsing Rd, Tucheng City,Taipei County 236, Taiwan

GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.

No. 69, Lushan Road, Suzhou New District Jiangsu, China

declares that the below mentioned product

GFG-3015

is herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (2004/108/EC) and Low Voltage Equipment Directive (73/23/EEC & 93/68/EEC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive, the following standards were applied:

◎

EMC

EN 61326-1 :

EN 61326-2-1:

Conducted and Radiated Emissions

CISPR11: 2003+A1: 2004+A2: 2006

Current Harmonic

EN 61000-3-2: 2006

Voltage Fluctuation

EN 61000-3-3: 1995+A1: 2001+A2 : 2005

-------------------------

◎◎◎◎ Safety

Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC

Safety Requirements

IEC/EN 61010-1: 2001

Electrical equipment for measurement, control and laboratory use––EMC

requirements

Electrostatic Discharge

IEC 61000-4-2: 2001

Radiated Immunity

IEC 61000-4-3: 2006+A1: 2007

Electrical Fast Transients

IEC 61000-4-4: 2004+Corr.1 : 2006+Corr.2 : 2007

Surge Immunity

IEC 61000-4-5: 2005

Conducted Susceptibility

IEC 61000-4-6: 2003+A1: 2004+A2: 2006

Power Frequency Magnetic Field

IEC 61000-4-8: 2001

Voltage Dips/ Interrupts

IEC 61000-4-11: 2004

GFG-3015 p.1

1. Precautions

This statement identifies conditions or practices that could

This term indicates that an injury hazard may occur, but is

rm indicates potential damage to this product or other

GFG-3015 is specially designed for safety operation. It has passed through

rigorous tests of inclement environment to ensure its reliability and good condition.

The following precautions are recommended to insure your safety and keep the

best condition of the equipment.

(1) Safety Terms and Symbols

The following terms and symbols may appear in this manual:

!

WARNING

CAUTION

result in injury or loss of life.

result in damage to this product or other properties.

The following terms and symbols may appear on the product:

DANGER This term indicates an immediately accessible injury hazard. WARNING

not immediately accessible.

CAUTION This te

properties.

DANGER

High voltage

Protective

Conductor

Terminal

refer to manual

!

ATTENTION

Double

Insulated

DANGER

Hot surface

Earth

Ground

Terminal

(2) Do not place any heavy objects on the instrument under any circumstances.

(3) Disassembling the instrument

Due to the precision of this instrument, all the procedures of disassembling, adjusting, and maintenance should be performed by a professional technician. If the instrument has to be opened or adjusted under some unavoidable conditions, and to be managed by a technician who is familiar with GFG-3015. Once there is any abnormality, please contact our company or our distributor near you.

(4) Power Supply

AC input should be within the range of line voltage±15%, 50/60Hz. To prevent the instrument from burning up, be sure to check the line voltage before turning on power.

p. 2 GFG-3015

(5) Grounding

To avoid electrical shock, the power cord protective grounding

For continued fire protection, replace fuse only with the

d personnel. Disconnect the

Figure (A)

Figure (B)

!

WARNING

conductor must be connected to ground.

GFG-3015 can be operated only with an earth grounded AC power cord that connects the case and ground well. This is to protect the user and the instrument from the risk of shock hazard.

(6) Fuse Replacement

!

WARNING

specific type and rating by qualifie power cord before replacing fuse.

The fuse blows only when there is any wrong on the instrument, which will stop working under this situation. Please find out the cause, then open the outside case (Please see the Figure (A), Figure (B) on below) and replace a proper fuse as listed below. Be sure to use the correct fuse before changing the applying location.

F101 : T 0.8A/250V F100 : T 0.5A/250V

Check the line voltage setting on the rear panel. If the line voltage setting does not match, Please change the line voltage setting according to the following steps:

1. Remove line cord from AC socket.

2. Switch the “AC line voltage switch” to correct setting with flat-blade screwdriver and reinsert.

(7) Cleaning the Cabinet

Disconnect the AC power cord before cleaning the instrument.

Use a soft cloth dampened in a solution of mild detergent and water. Do not spray cleaner directly onto the instrument, since it may leak into the cabinet and cause damage.

Do not use chemicals containing benzing, benzne, toluene, xylene, acetone, or similar solvents.

GFG-3015 p.3

(8) Operation environment

For measurements performed on circuits directly

For measurements performed on circuits not directly

Green/Yellow

Indoor use Altitude up to 2000m Temperature to satisfy the specification : 18oC ~ 28oC (+64.4oF ~ +82.4oF) Operating temperature : 0oC ~ 40oC (+32oF ~ +104oF) Storage temperature : -10oC ~ 70oC (+14oF ~ 158oF) Relative humidity : up to 90% when 0oC~35oC;

up to 70% when 35oC~40oC

Installation category： CAT Ⅱ(The detail is as Table A) Pollution degree： 2

Table A

CAT Ⅳ

For measurements performed at the source of the low-voltage installation.

CAT Ⅲ

For measurements performed in the building installation.

CAT Ⅱ

connected to the low-voltage installation.

CAT Ⅰ

connected to Mains.

(9) Place GFG-3015 in a location with a suitable environment as stated above free

from dust, direct exposition of sunlight, and strong effect of magnetic fields.

(10) For United Kingdom

NOTE

This lead/appliance must only be wired by competent persons.

WARNING

THIS APPLIANCE MUST BE

EARTHED

IMPORTANT

The wires in this lead are coloured in accordance with the following codes:

Blue Brown

:Earth :Neutral :Live

(Phase)

As the colours of the wires in mains leads may not correspond with the

coloured markings identified in your plug/appliance, proceed as follows:

The wire which is coloured Green and Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol or

coloured Green or Green and Yellow.

The wire which is coloured Blue must be connected to the terminal which

is marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal

marked with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or

contact the supplier.

This cable/appliance should be protected by a suitably rated and

approved HBC mains fuse; refer to the rating information on the

equipment and/or user instructions for details. As a guide, cable of

0.75mm2 should be protected by a 3A or 5A fuse. Larger conductors

would normally require 13A types, depending on the connection method

used.

Any moulded mains connector that requires removal/replacement must

be destroyed by removal of any fuse and fuse carrier and disposed of

immediately, as a plug with bared wires is hazardous if engaged in a live

socket. Any re-wiring must be carried out in accordance with the

information detailed in this section.

p. 4 GFG-3015

2. Product Introduction

The frequency feedback method applied by GFG-3015 is a new technique that generates stable output frequency with extraordinary accuracy for Function Generator.

The traditional function generators typically use integrating circuit and constant current circuit techniques that are easily affected by operation temperature or the quality of resistor or capacitor and other key components to occur poor frequency accuracy. The innovative design for GFG-3015 is to get rid of these problems.

The frequency feedback system needs a compatible, powerful frequency counter. GW has designed his own full-function counter chip, GFC-9701, for this system with high frequency test range and full functions, including Period test, Duty test, Ratio test, Time interval, Pulse wide, direct display and direct connect with CPU system.

GFG-3015 uses this Chip to read output frequency value at any time. Then CPU will modify the correct value of D/A converter immediately according to this value, so that the user can get a high accuracy frequency from GFG-3015 Function Generator.

Besides, the GFG-3015 can also generate a high accuracy frequency to provide high frequency resolution.

Graph1 indicates the fundamental construction of a frequency feedback system.

D/A

Convertor

User

Interface

Except the different design from the typical circuit, GFG-3015 system also has micro controller (CPU unit) equipping an additional RS-232 interface functions which will be used on any test system with other instrument or to be controlled by computer.

CPU

(GFC-9701)

VCO

Counter

AMP O/P

GFG-3015 p.5

3. Features

GFG-3015 is a functional Function generator that applies Frequency feedback control system technique and can generate high frequency accuracy with high resolution. Its main signal source can generate waveforms including sine wave, square wave, triangle wave, and ramp wave.

There are additional features listed as follows:

 All digitized operation user interface

 Output Waveforms of Sine, Square, Triangle, Ramp, Pulse, AM, FM, Sweep,

Trigger and Gate or Burst.

 Wide output frequency range 0.01Hz ~ 15MHz.

 High frequency accuracy 0.02% ± 5 count.

 Maximum frequency resolution 10mHz.

 Dual displays indicate frequency and amplitude or other necessary information.

 Built-in 6-digit INT/EXT Function Counter and up to 150MHz frequency range with

high resolution.

 INT/EXT AM/FM Modulation with internal modulation signal output.

 LIN/LOG Sweep Mode with internal sweep signal output.

 VCF of 100:1 EXT Frequency Control.

 SYNC Output.

 TTL Output.

 Synchronization GCV Output.

 Variable DC Offset Control

 Output Overload Protection

 RS232 Interface Standard

p. 6 GFG-3015

4. Specifications

Ramp, Pulse, AM, FM, Sweep,

amplitude

Output Waveforms

Frequency Range 10mHz~15MHz in 8 Frequency Range (auto switch)

Frequency

Resolution

Frequency

Accuracy

Output Impedance

Amplitude

Sine, Square, Triangle, ± Trigger, Gate or Burst

1.5001MHz ~ 15.0000MHz …(100Hz)

150.01kHz ~ 1.50000MHz…(10Hz)

15.001kHz ~ 150.000kHz…(1Hz)

1.5001kHz ~ 15.0000kHz…(0.1Hz);

150.01Hz ~ 1.50000kHz…(10mHz)

15.01Hz ~ 150.00Hz…(10mHz)

1.51Hz ~ 15.00Hz…(10mHz)

0.01Hz ~ 1.50Hz…(10mHz)

0.02% ±5 Count

50Ω ± 10%

10.00V~0.01V (into 50Ω) 4

Range

Resolution 10mV(10.00V~0.01V)

ranges

| Vac peak | + | Vdc | < 5V

DC Offset

Duty

Sync Output

Sine

Square

Accuracy

Unit Vpp, Vrms, dBm

Range

Resolution 10mV

Accuracy

Control Range

Resolution

Accuracy

Impedance 50 Ω ±10%

Level >1Vp-p open circuit

Distortion

Asymmetry

≤3% ±5count at 10Hz~1MHz

≤10% ±5count at 1MHz~15MHz

± 5V (into 50Ω)

| Vac peak | + | Vdc | < 5V

≤3% ±3count at Amplitude Min.

80%:20%:80% to 1MHz

1%

≤1% to 1MHz at 50% Duty

≤0.5%(-46dBc) From 10Hz~100kHz ≤-30dBc To 15MHz

(Spec. applied form 1Vpp to 10Vpp)

±1% of period + 3ns

Triangle and Ramp

Rise or Fall Time <18nSec

Linearity Error <1% of full scale output at 100Hz

GFG-3015 p.7

Sweep

AM, FM, Sweep, Trigger(int/ext), Gate or

amp or

10mHz~10KHz in 3 Frequency Range

Sweep Mode Linear or Log sweep

150kHz~15MHz 15kHz~1.5MHz

1.5kHz~150kHz

Sweep Range

150Hz~15kHz 15Hz~1.5kHz

1.5Hz~150Hz

0.15Hz~15Hz

0.01Hz~1.5Hz

Width >100:1(In Same Frequency Range)

Rate 0.01Hz~10kHz

Symmetry Control 90:10:90 ; Resolution:1%

Sweep output 0 to≥-5Vp-p into 10k Ω

Modulation

Types

Waveform

Burst (Implement by Trigger Type) Sine, Square, Triangle, R Variable Symmetry Pulse

Rate Frequency

Range

Rate Frequency

Accuracy

Rate Frequency

Resolution

(auto switch)

5%±1 count

10.0kHz~0.1kHz(100Hz) 99Hz~1Hz(1Hz)

0.99Hz~0.01Hz(0.01Hz)

Symmetry 90%:10%:90%; Resolution:1%

Symmetry Accuracy

Output Level

±1 count(≤1%)

≧1Vpp into 10kΩ load

Sine Wave Distortion ≤2% from 10Hz to 10kHz

Amplitude Modulation

Depth 0~100%

Modulation

Frequency Rate

Carries -3dB

Bandwidth

0.01Hz ~ 10kHz(INT) DC~1MHz(EXT)

<100Hz to >5MHz

External Sensitivity ≤10Vpp for 100% modulation

Frequency Modulation

Frequency Rate

External Sensitivity ≤5Vpp for 15% deviation

p. 8 GFG-3015

Deviation 0~±15%

Modulation

0.01Hz ~ 10kHz(INT) DC ~ 50kHz(EXT)

Start/Stop Phase

In Same Frequency

to 2V as per different

± 20ppm(23ºC ± 5ºC) after 30 minutes

nHz for

Range

Rate 0.01Hz~10kHz

-90º ~ +80º

Trigger

VCF

TTL Output

GCV Output

Frequency Counter

Interface RS232

Frequency Range 0.1Hz ~ 1MHz(Useful to 10MHz)

Ext Trig Frequency

Range

Gate or Burst

Range

DC to 1MHz,TTL compatible input level

Implement by Trigger setting. 100:1(0 to 10V± 1V)

Range

Input Linearity <0.5% to 1MHz,<5% to 10MHz

Input Impedance 10 k Ω

Level

≧3Vpp

Fan-out >10 TTL Load

To set the voltage between 0.2V Frequency in Same frequency Range

INT/EXT Switch Selector

Range 5Hz~150MHz EXT

Accuracy Time Base(10MHz) Accuracy ± 1 count

Time Base

Resolution

warm up The maximum resolution is 100 1Hz and 1Hz for 100MHz

Input Impedance 1MΩ // 150pF

Sensitivity

≤35mVrms(5Hz~100MHz); ≤45mVrms(100MHz~150MHz)

Accessories

Power Source

Dimensions

GTL-101 × 2, Instruction Manual × 1, Power cord × 1

115/ 230V AC ±15%, 50/60Hz

290 (W) × 142 (H) × 346 (D) mm

Weight Approx. 5kg

GFG-3015 p.9

5. Front and Rear Panels

Front Panel

p. 10 GFG-3015

RATE

SPAN

1

is

FUNC

FREQ

AMPL

OFFSET

D

UTY

MOD/ON

POWER button

:

Push the button to turn on the power, and the display activated. Push again the button to turn off the power.

2

Main Function keys

:

Key is to set main output waveform in the cycle of Sine, Triangle and Square. When the key is pressed, the related waveform LEDs will light up accordingly.

Key is to set main frequency entry mode. Key in the desired value of frequency by using the number keys or Modify keys and Unit keys. When the key is pressed, the FREQ LED (on parameter display area A) will be flashing until other mode is set.

Key is to set main amplitude entry mode. Key in the desired value of voltage by using the number keys or Modify keys and Unit keys. When the key is pressed, the AMPL LED (on parameter display area B) will be flashing until other mode is set.

Key is to set main output offset voltage entry mode. Key in the desired value of voltage by using the number keys or Modify keys and Unit keys. When the key is pressed, the OFFS LED (on parameter display area B) will be flashing until other mode is set.

Key is to set main output Duty Cycle entry mode. Key in the desired value of percentage by using the number keys or Modify keys and Unit keys. When the key is pressed, the DUTY LED (on parameter display area B) will be flashing until other mode is set.

3

Modulation/Sweep Function keys

Key is to start performing Amplitude Modulation, Frequency Modulation or Sweep function. When the key is pressed again, the functions will stop. When the key is pressed, the ON/OFF LED (on MOD/SWP Function LED area) will light up, press again the key, the LED will be off.

:

These keys control the functions of sweep and modulation.

SOURCE

Key is to set Span of Modulation or Sweep entry mode and choose the source of modulation. If set to source choose function, must use Secondary Function mode.

FM

Key is to choose the type of modulation between AM and FM. If want to set to FM function, must use Secondary Function mode.

INT/EXT

Key is to set Rate of Modulation, Sweep or Trigger entry mode and choose the signal source of Modulation, Sweep or Trigger. If want to set to signal, must use Secondary Functions mode.

GFG-3015 p.11

DEG/%

START

LIN S

STOR

RS232

KHz/Vrm

s Hz/Vpp

SYM

RS232

lease refer to the

4

the setup parameters of the

the selected

Key is to start performing RS232 interface. Press the

s (ON or

knob to change the

Baud rate. The cycle order is in 300, 600, 1200, 2400, 4800,

, must use Secondary

Secondary Functions mode. When

the key is pressed, the instrument will choose Secondary

can recall the default

In ‘Normal’ mode, these

keys are used to assign the unit and to set the entered value.

Vpp to set the output

amplitude. They can be used to set frequency (MHz, kHz,

MHz/dB

SHIFT

System keys

STOP

Key is to set Start Frequency of Sweep entry mode and Stop Frequency of Sweep entry mode. If set to Stop Frequency of Sweep entry mode, must use Secondary Functions mode.

LOG S

Key is to choose the type of Sweep between liner sweep and LOG sweep. If set to LOG sweep, must use Secondary Function mode.

SWP CF

Key is to set the Duty cycle of Modulation, Sweep or Trigger source entry mode. Key in the desired value of percentage by using number keys or modify keys and Unit keys. If want to set to center frequency of Sweep function that must use Secondary Functions mode. When the key is pressed, the SYM LED (on parameter display area B) will be flashing until other mode is set. When you use center frequency entry mode then the CF LED (In parameter display area A) will be flashing until other mode is set. The detail operation of these keys. P instruction in next Chapter.

RECL

:

Key is to save or reload instrument into or take out from memory; numbers is from 0 to 9, up to 10 groups.

DEFAU

5

Unit keys

key then use rotational knob to change function state OFF).

Press the key again then use rotational

9600 and 19200 sequence. If set the instrument to default state Function mode.

Key is to set the

Function and the SHIFT LED will light up.

DEFAU

For example, press + value of the instrument.

:

For example, you can use dBm and

Hz), OFFSET, and PHASE, etc. In STOR or RECL modes, they are used as ‘Enter’.

p. 12 GFG-3015

GATE

TRIG ON

SIGL/MUT

PHASE

TRI

G EXT

►

9 . 0

-

/BK SP

◄

HOLD

6

keys are used to input

used to delete the entered

are used to change the digit of input

the function of all Modify keys until

until the

arameter

, internal

LED (In Trigger Function

area) will light up accordingly until the key is pressed

source of counter,

display presents the parameter values

was

Entry keys

:

To and value. A unit key should be pressed to set the entered value.

key is blank space that value entirely and the other function is minus key .

7

Modify keys

8

Trigger Function keys

:

Keys value. User can use the Rotate knob for increasing or decreasing that digit.

Key to terminate user press this key again. When the key is pressed, the HOLD LED will light up key is pressed again.

:

Key is to start performing Trigger function mode. If the key is pressed again, the function will stop. When the key is pressed, the ON/OFF LED (In Trigger Function LED area) will light up until the key is pressed again (The LED will light off).

Key is to choose the type of Trigger, Single-trigger or multi-trigger. When the key is pressed, the MULT or SINGL LED (In Trigger Function LED area) will light up accordingly.

Key is to set the phase of trigger function entry mode. Key in the desired value of percentage by using number keys, modify keys and Unit keys. When the key is pressed, the PHASE LED (In p display area B) will be flashing until other mode is set.

9

Counter Function key

10

Parameter display Area (A)

Key is to choose the Trigger signal source or external. When the key is pressed, the EXT LED again (The LED will light off).

INT/EXT

:

Key is to set the Gate time of External counter function. The cycle order is according to 0.01s, 0.1s, 1s, and 10s. When the key is pressed, the Gate time LEDs will light up according user’s wish. The other function is to choose input signal internal or external, by using Secondary Function mode.

:

The 6-digit Parameter and information about the current status and unit. The START LED light on indicated that the value of display was Start frequency of sweep function right now. The STOP LED light on indicated that the value of display was Stop frequency of sweep function right now. The CF LED light on indicated that the value of display center frequency of sweep function right now.

GFG-3015 p.13

rate frequency of sweep or modulation or trigger function

unit

11

presents the parameter values

was

modulation signal duty cycle of sweep or modulation or trigger

d

of Sweep and

setting status of

LOG

external sweep or

sweep or

Parameter display Area (B)

The FREQ LED light on indicated that the value of display was main output frequency right now. The RATE LED light on indicated that the value of display was right now. The SPAN LED light on indicated that the value of display was Span frequency of sweep function right now. The MHz, kHz, Hz and mHz LED light on indicated that according current value of display.

:

This 4-digit Parameter display and information about the current status and unit. The AMPL LED light on indicated that the value of display was main output amplitude right now. The OFFS LED light on indicated that the value of display was main output DC offset voltage right now. The DUTY LED light on indicated that the value of display was main output duty cycle right now. The SPAN LED light on indicated that the value of display was span frequency of modulation function right now. The SYM LED light on indicated that the value of display

12

Waveform Function LEDs

13

Counter Functions LEDs

14

Modulation/Sweep Function LEDs

function right now. The PHASE LED light on indicated that the value of display

was phase of trigger function right now. The STOR LED light on indicated that the value of display was save group number right now. The RECL LED light on indicated that the value of display was reload group number right now. The V, rms, dBm kHz, Hz, % and DEG LED light on indicated that unit according current value of display.

:

These LEDs indicate the figure of main output waveform and the current operation functions.

:

These LEDs indicate the GATE TIME of external counter an the current value.

:

These LEDs indicate the current status Modulation and the current operation functions. The AM LED lights on to indicate the amplitude modulation function. The FM LED lights on to indicate the setting status of frequency modulation function. The LIN LED lights on to indicate the setting status of liner sweep function. The LOG LED lights on to indicate the setting status of sweep function. The Sine, Triangle and Square LED light on indicated that according Modulation source waveform. The EXT LED lights on to indicate the modulation signal source. The ON/OFF LED lights on to indicate that the modulation function is enabled.

p. 14 GFG-3015

15

on

trigger setting status

external trigger signal

trigger function

enter mode is

all modify keys is

status with

This is the BNC connector that outputs all main signals.

signals. Output

the voltage between

internal Sweep or

≤10Vpp is

Trigger Function LEDs

16

Shift mode LED

17

Hold mode LED

18

RS-232 Interface LED

19

Main Output BNC

20

Sync Output BNC

21

TTL Output BNC

22

GCV Output BNC

23

Modulation/Sweep Output BNC

24

EXT Modulation/Trigger Input BNC

25

VCF Input BNC

26

EXT

Counter

Input BNC

:

These LEDs indicate the current status of trigger function display and the current operation functions. The MULT LED lights on to indicate the of multi-trigger type. The SINGL LED lights on to indicate the of Single-trigger type. The EXT LED lights on to indicate the source. The ON/OFF LED lights on to indicate that the is enabled. The SHIFT LED light on indicated that the

:

Secondary Functions right now. The HOLD LED lights on to indicate that

:

disabled. The RS232 LED indicates the current operation

:

the RS-232 interface bus.

:

Output resistance is 50Ω.

:

This is the BNC connector that outputs sync resistance is 50Ω.

:

This is the BNC connector that outputs TTL level signals.

:

This is the BNC connector that outputs

0.2V and 2V varied with different Frequency

:

This is the BNC connector that outputs modulation signals. Output

:

This is the BNC connector for EXT amplitude/frequency modulation or EXT sweep signal input. The amplitude modulation index is 100% when input. The frequency modulation index is 15% when ≤5Vpp is input. The trigger mode input signal is compatible with TTL level.

:

This is the BNC connector for VCF signal input. The frequency variation width index is 100:1 when is input. Input

:

This is the BNC connector for external counter signal input. The Input

Impedance

is 10kΩ.

is

1MΩ // 150pF

is 10kΩ.

10V± 1V

GFG-3015 p.15

Rear Panel

p. 16 GFG-3015

This is the AC power input terminal. AC input should be within

line voltage between 115V

1

Power Entry model

2

Line Voltage Selector

3

RS232 connector

:

the range of line voltage±15%, 50/60Hz.

:

This switch can choose the current and 230V

:

This is the port of serial RS232 interface. The DCE and Baud rate is among 300 ~ 19.2k.

GFG-3015 p.17

RS232

6. Operation

SHIFT

FUNC

FREQ

◄ ►

6.1 The First Step Setup For Instrument

 Ensure that the voltage of main supply is compatible with this instrument. The

selector on the rear panel states the required AC line voltage.

 Connect the instrument to main supply with the power cord.  Press the Power Switch, all control functions will be shown on the parameter

display area.



Press + can recall the default value of this instrument.

6.2 The Setup of Output Function

 Press key to select main output waveform. The Waveform will change

when you press this key each time. The cycle order is according to Sine, Triangle, Square.

When the key is pressed, the waveform LEDs will light up according to the

mentioned cycle order of output waveform.

 Set different duty cycle ratio (not 50%) for Triangle or Square waveform to get

±Ramp or different Pulse width square waveform.

6.3 The Setup of Frequency

DEFAU

 Set to Frequency Entry mode by pressing button,

parameter display area A) will be flashing.

the FREQ LED (In

 Key in the desired value of frequency.  Select a proper unit-button to specify the value.

 In addition, you can use and the Rotate Knob to adjust the

main frequency value you need.

Note: The frequency range of this instrument is from 10mHz to 15MHz in 8 Frequency

Range. The details and resolution is as below. But those ranges will auto switch according to the enter value.

Frequency Range

10mHz~15MHz in 8 Frequency Range (auto switch)

1.5001MHz ~ 15.0000MHz …(100Hz)

150.01kHz ~ 1.50000MHz…(10Hz)

15.001kHz ~ 150.000kHz…(1Hz)

Frequency

Resolution

1.5001kHz ~ 15.0000kHz…(0.1Hz);

150.01Hz ~ 1.50000kHz…(10mHz)

15.01Hz ~ 150.00Hz…(10mHz)

1.51Hz ~ 15.00Hz…(10mHz)

0.01Hz ~ 1.50Hz…(10mHz)



Example of the Setup Frequency

1. To set frequency at 250Hz

Press first, then key in and press .

p. 18 GFG-3015

Hz/Vpp

2. To modify the frequency to 850Hz.

◄ ►

AMPL

8

◄

►

◄ ►

OFFSET

1

◄

►

◄ ►

OFFSET

Press or to move flash digit to “ 2 ” position.

Then turn the Rotate Knob clockwise until the digit become to “ 8 ”.

6.4 The Setup of Amplitude

 Set to

LED (In parameter display area B) will be flashing.

Main Amplitude entry mode

by pressing button to

, now the AMPL

 Key in the desired value of Amplitude.  Select a proper unit-button to specify the value.

 In addition, you can use or and the Rotate Knob to modify

the main Amplitude value you need.



Example of the Setup Amplitude

1. To set Amplitude at 8 Vpp.

Press first, then key in and press .

2. To modify the Amplitude to 5 Vpp.

Press or to move flash digit to “ 8 ” position.

Then turn the Rotate Knob anti-clockwise until the digit become to “ 5 ”.

The input limit : (1) Amplitude should be among 0.01 ~ 10Vpp.

(2) Offset should be among ±5Vpp. (3) AMPL + |2 × OFFSET| ≤ 10Vpp.

6.5 The Setup of Offset

 Set to m

OFFS LED (In parameter display area B) will be flashing.

 Key in the desired value of DC offset voltage.  Select a proper unit-button to specify the value.

 In addition, you can use and the Rotate Knob to modify the

main DC offset voltage value you need.



Example of the Setup Offset

1. To set DC offset voltage at 1 Vpp.

Press first, then key in and press .

2. To modify offset voltage to 2 Vpp.

Press or to move flash digit to “ 1 ” position. Then turn the Rotate Knob clockwise until the digit become to “ 2 ”.

The input limit : (1) Amplitude should be among 0.01 ~ 10Vpp.

ain DC offset Voltage entry mode by

(2) Offset should be among ±5Vpp.

(3) AMPL + |2 × OFFSET| ≤ 10Vpp.

pressing button, now the

GFG-3015 p.19

DEG/%

MHz/dB

kHz/Vms

Hz/Vpp

5 Hz/Vpp

DEG/%

MHz/dB

kHz/Vms

Hz/Vpp

STOR

6.6 The Setup of Duty

DUTY 6

◄ ►

DUTY

0

SHIFT

 Set Duty cycle of Main output entry mode by pressing button, the

DUTY LED (In parameter display area B) will be flashing.

 Key in the desired value of Duty cycle.  Key in the specific value by using Unit button.

 In addition, you can use and the Rotate Knob to modify the

Duty cycle of Main output value you need.



Example of the Setup Duty

1. To set Duty cycle at 60%.

Press first, then key in and press .

2. To modify Duty cycle to 30%.

Press or to move flash digit to “ 6 ” position. Then turn the Rotate Knob anti-clockwise until the digit become to “ 3 ”. The input limit: 80%:20%:80% at 1MHz.

6.7 The Setting of STORE

The Store button is used to save the setup parameters of the instrument into its memory with the stored group number from 0 to 9, up to 10 groups totally.

RECL

 Push button.  Key in the group number from 0 to 9.

 Press any button from or to complete the

setting.



Example of the Setup STOR

To save a parameter to the RAM of group #5.

RECL

Press first, then key in and press .

6.8 The Setting of RECALL

The Recall button can retrieve the parameters saved in the RAM.

 Push and button.  Key in the group number from 0 to 9.

 Press any button from or to complete the

setting.



Example of the Setup RECALL

RECL

To retrieve a parameters from the RAM of group #6.

RECL

Press and first, then key in and press

p. 20 GFG-3015

RS232

STOR

SYM

LIN S

START

RATE

SPAN

GATE

LIN S

RATE

6.9 The SHIFT Key and Function Keys

SHIFT

AMPL

FUNC

The button is used to enable the secondary function of certain function

keys with blue printed letters. After pressing the button, The SHIFT LED

will light up, only the buttons with blue printed letters are working. To release the

secondary function by pressing again.

 The Secondary Functions

DEFAU

1. + Return to the default status of GFG-3015.

RECL

2. + Retrieve the setup parameters from memory;

SWP CF

3. + Display sweep center frequency and get into enter mode.

SOURCE

4. + Change the Modulation source.

FM

5. + Set Frequency modulation function.

INT/EXT

6. + Choose the Modulation type.

STOP

7. + Display Sweep stop frequency and get into enter mode.

LOG S

8. + Set LOG sweep function.

INT/EXT

9. + Choose the Counter signal source.

6.10 Setup of LIN or LOG Sweep

GFG-3015 can adopt frequency to sweep its function output for triangle and ramp waves. The type of sweep can be set as linear or log sweep.

 Select a main waveform by using button.

 Select a main output amplitude by using button.

LOG S

 Select the sweep mode by using button.

INT/EXT

 Press to set up sweep RATE value (Range from 0.01Hz to 10kHz).

GFG-3015 p.21

START

STOP

START

SYM

SPAN

SYM

SHIFT

MOD/ON

 Set the starting frequency by pressing button and terminate sweep

STOP

frequency by pressing + .

The start and stop frequency must be at the same sweep frequency range.

Please refer to the Note 2 for the details.

The sweep can also be done by enter Center frequency or Span frequency.

SWP CF

Press + for center frequency entry mode (Note 3).

SOURCE

Press for span frequency entry mode (Note 3).

SWP CF

 Press to set the Duty of sweep signal (Range 90%:10%:90%).

 Press to initiate sweeping.

Note: 1. Please refer to the setup of LIN and LOG Sweep as the sample below.

2. Because all frequency range (0.01Hz ~ 15MHz) of GFG-3015 are composed of

8 frequency ranges (The details as below), So the value of start and stop frequency must be at the same sweep range.

150kHz ~15MHz

15kHz ~1.5MHz

1.5kHz ~150kHz

Sweep Range

150Hz ~15kHz

15Hz ~1.5kHz

1.5Hz ~150Hz

0.15Hz ~15Hz

0.01Hz ~1.5Hz

3.

The bandwidth [SPAN] = stop frequency - start frequency

The center frequency = [(stop frequency + start frequency)/2] The start frequency = center frequency of the sweep - bandwidth/2

The stop frequency = center frequency of the sweep + bandwidth/2 The start and stop frequencies can be freely set according to the users’ preference.

4. It won’t make any change on execution and result by taking different step sequence.

5. GFG-3015 can output waveform synchronizing with its sweep function. In the example of setting up LIN sweep, the Modulation output terminal will output the waveform of triangle at 1Hz.



Example of the Setup of LIN Sweep

To set the following conditions:

 Output function : Sine Wave.  Start frequency : 1kHz.  Output Amplitude : 10Vpp.  Stop frequency : 10kHz.  Sweep mode : LIN.  Sweep signal symmetry: 50%.  Speed :1 second.

p. 22 GFG-3015

Hz/Vpp

KHz/Vrm

s

KHz/Vrm

s

DEG/%

Hz/Vpp

KHz/Vrm

s

KHz/Vrm

s

DEG/%

Hz/Vpp

LIN S

RATE

START

SYM

START

LIN S

RATE

START

SYM

START

Procedure:

AMPL

1

SHIFT

1 0

5 0

MOD/ON

FUNC

1

SHIFT

1 0

9 0

SHIFT

0

◄ ►

FUNC

1 0

AMPL

1 0

Press to select SINE wave for main output.



Press in sequence.



LOG S

Then press to select linear sweep mode.



INT/EXT

Press in sequence.



STOP

Press in sequence.



STOP

Press in sequence.



SWP CF

Press in sequence.



Press



The Modulation/Sweep Output BNC will output 1Hz Triangle wave.



In addition, you can use and the Rotate Knob to modify the value you need.



Example of the Setup of LOG Sweep

To set the following conditions:

 Output function: Triangle Wave.  Start frequency: 10kHz.  Output amplitude: 10Vpp.  Stop frequency: 100kHz.  Sweep mode: LOG.  Sweep signal symmetry: 90%.  Speed: 0.1 second.

Procedure:

Press to select TRIANGLE wave for main output.



Press in sequence.



LOG S

Then press to select LOG sweep mode.



INT/EXT

Press in sequence.



STOP

Press in sequence.



STOP

Press in sequence.



SWP CF

Press in sequence.



GFG-3015 p.23

Hz/Vpp

LIN S

START

Press .

MOD/ON

◄ ►

1

SHIFT

1

MOD/ON

0

MHz/dB

0

MOD/ON



The Modulation/Sweep Output BNC will output the 10Hz LOG wave.



In addition, you can use and the Rotate Knob to modify the value you need.



Error message for Sweep Function

Because all frequency range (0.01Hz ~ 15MHz) of GFG-3015 are composed of 8 frequency ranges, So the Sweep function has specific restriction on the start and stop frequency. If the value of start and stop frequency not at the same sweep range, then the instrument will show the message to user. Basically, The message is a suggestion that remind user of selecting a proper sweep frequency range and amend the start or stop frequency. Please refer to the sample below:

To set the following conditions:

 Start frequency: 100Hz.  Stop frequency: 1MHz.

Procedure:

LOG S

Press to select linear sweep mode.



STOP

Press in sequence.



STOP

Press in sequence.



Press .



When the key is pressed, The Display area will show reminding message (The detail as below) If the input sweep ranges out of correct range, The instrument will according to start and stop frequency to suggest possible sweep range. In this sample, The message of “15Hz – 1500Hz or 15kHz – 1500kHz” range will be provided. Because the input start frequency is at 100Hz, so “15Hz –

1.5kHz” can match up the requirement. Besides, the stop frequency is at 1MHz, so “15kHz – 1.5MHz” is close to range requirement. After show the message, The Display area will back to original state (Before press the button).

p. 24 GFG-3015

RATE

SPAN

SYM

6.11 Setup of AM Modulation

SHIFT

MOD/ON

SHIFT

FUNC

AMPL

FREQ

The AM modulation function offers internal sine, square, and triangle (ramp) signals. Besides, You can select the modulation signal from external (Modulation/Trigger Input BNC).

 Set the main output function by using button .

 Set the main output frequency by using button and number keys.

 Set the main output Amplitude by using button and number keys.

FM

 Select the modulation mode by using button.

INT/EXT

 Select the modulation signal source by using + .

INT/EXT

 Press to set up modulation RATE value (Range 0.01Hz ~ 10kHz).

SOURCE

 Select the modulation signal by pressing + buttons.

GFG-3015 offers sine, square, and triangle (ramp) signals for internal

modulation.

SOURCE

 Select the amplitude modulation depth by pressing buttons (Range

100%).

SWP CF

Press to set the Duty of modulation signal (Range 90%:10%:90%).

Press to start performing amplitude modulation.

Note: 1. Please refer to the setup of amplitude modulation as the example below.

2. When the modulation signal sources from external are selected, the Rate,

Span (Depth), Symmetry and source selection will disable as these functions are operated on internal source mode only.

3. It won’t make any change on execution and result by taking different step sequence.

4. GFG-3015 can output waveform synchronizing with its modulation function. In the example of setting up amplitude modulation, the Modulation output terminal will output the waveform of sine at 100Hz.



Example of the Setup of AM Modulation

To set the following conditions:

 Main function: Sine Wave.  Modulation rate: 100Hz.  Main Frequency: 10kHz.  Modulation Signal Source: Sine.  Main Output Amplitude:10Vpp  Modulation Depth: 80%.  Modulation Mode: Amplitude  Modulation Signal Symmetry: 50%.  Modulation Source: INT

Procedure:

Press to select SINE wave for main output.



GFG-3015 p.25

Hz/Vpp

DEG/%

KHz/Vrm

s

DEG/%

Hz/Vpp

RATE

SPAN

SYM

RATE

SPAN

RATE

Press in sequence.

8

1 0

MOD/ON

FREQ

0

1 0

SHIFT

5 0

◄ ►

FREQ

SHIFT

FUNC

SHIFT

1 0 AMPL

AMPL



Then press in sequence. .



FM

Press to set AM mode.



INT/EXT

Press to select the source from internal signal.



INT/EXT

Press in sequence.



SOURCE

Press to select the modulation signal on SINE wave.



SOURCE

Press in sequence.



SWP CF

Press in sequence.



Press .



The MOD Output BNC will output 100Hz sine wave.

In addition, you can use and the Rotate Knob to modify the value you need.

6.12 Setup of FM Modulation

The FM modulation function offers internal sine, square, and triangle (Ramp) signals. Besides, you can select the modulation signal from external (Modulation/Trigger Input BNC).

 Set the main output function by pressing button.

 Set the main output Amplitude by pressing button and number keys.

 Set the main output frequency by pressing button and number keys.

FM

 Select the modulation mode by pressing + buttons.

INT/EXT

 Select the modulation signal source by pressing + buttons.

INT/EXT

 Press to set up modulation RATE value (Range 0.01Hz ~ 10kHz).

SOURCE

To select the modulation signal by pressing and buttons. GFG-3015 offers sine, square, and triangle (ramp) signals for internal

modulation.

p. 26 GFG-3015

SOURCE

SPAN

SYM

MOD/ON

FUNC

 To select the Frequency modulation deviation by pressing buttons.

(Range ±15%).

SWP CF

Press to set the Duty of modulation signal (Range 90%:10%:90%).

Press to start performing frequency modulation.

Note: 1. As all frequency range (0.01Hz ~ 15MHz) of GFG-3015 are composed

of 8 frequency ranges (The details as below), When the main frequency in FM function is set, a reasonable Span must be considered.

For example, If set the main frequency at 1.4MHz (Range 7) and set

Span at 10%, the corrected frequency vibration is from 1.26MHz to

1.54MHz and it will be over Range 7. Therefore, the FM result is faults now, the Span must be reduced in order to get a reasonable result.

Number of Range Main Setting Frequency FM variation Range

8 1.5001MHz ~ 15.0000MHz 7 150.01kHz ~ 1.50000MHz 6 15.001kHz ~ 150.000kHz 5 1.5001kHz ~ 15.0000kHz

150kHz~15MHz

15kHz~1.5MHz

1.5kHz~150kHz 150Hz~15kHz

4 150.01Hz ~ 1.50000kHz 15Hz~1.5kHz 3 15.01Hz ~ 150.00Hz 1.5Hz~150Hz 2 1.51Hz ~ 15.00Hz 0.15Hz~15Hz 1 0.01Hz ~ 1.50Hz 0.01Hz~1.5Hz

2. Please refer to the setup of frequency modulation as the example below.

3. When the modulation signal source external is selected, the Rate, Span

(Deviation), Symmetry and source selection will disable as those functions are workable on internal source mode only.

4.

It won’t make any change on execution and result by taking different step

sequence.

5. GFG-3015 can output waveform synchronizing with its modulation function. In the example of setting up frequency modulation, the “Modulation output terminal” will output the waveform of sine at 1kHz.



Example of the Setup of FM Modulation

To set the following conditions:

 Main function: Sine Wave.  Modulation rate: 1kHz.  Main Frequency: 100kHz.  Modulation Signal Source: Sine.  Main Output Amplitude: 10Vpp.  Modulation Deviation: 10%.  Modulation Mode: Frequency  Modulation Signal Symmetry: 50%.  Modulation Source: INT

Procedure:

Press to select SINE wave for main output.



GFG-3015 p.27

DEG/%

KHz

/Vrm

s

DEG/%

KHz/Vrm

s

SIGL/MUT

TRIG EXT

PHASE

Hz/Vpp

RATE

SPAN

RATE

SPAN

SYM

RATE

SYM

Press in sequence.

1

MOD/ON

FREQ

0

1 0

SHIFT

5 0

◄ ►

0

SHIFT

FREQ

FUNC

1 0 AMPL

AMPL



Then press in sequence.



FM

Press to set FM mode.



INT/EXT

Press to select the source from internal signal.



INT/EXT

Press in sequence.



SOURCE

Press to select the modulation signal on SINE wave.



SOURCE

Press in sequence.



SWP CF

Press in sequence.



Press .



The MOD Output BNC will output the 1kHz sine wave.

In addition, you can use and the Rotate Knob to modify the

value you need.

6.13 Setup of Trigger

The Trigger function offers internal trigger source signals. Besides, You can select the signal from external (From Modulation/Trigger Input BNC).

 Set the main output function by pressing button .

 Set the main output Amplitude by pressing button and number keys.

 Set the main output frequency by pressing button and number keys.

 Select the Trigger type by pressing button.

 Select the Trigger signal source by pressing button.

INT/EXT

 Press to set up Trigger signal RATE value (Range 0.01Hz ~ 10kHz).

SWP CF

 Press to set the Duty of Internal trigger signal (Range

90%:10%:90%).

 Select the Trigger start Phase by pressing button and number keys.

GFG-3015 offers -90º ~ +80º range for internal trigger mode.

Press to start performing Trigger function.

p. 28 GFG-3015

DEG/%

KHz/Vrm

s

DEG/%

KHz/Vrm

s

SIGL/MUT

TRIG EXT

PHASE

TRIG ON

SIGL/MUT

Hz/Vpp

RATE

SYM

Note: 1. Please refer to the setup of Trigger function as the example below.

.

FUNC

3

1

FREQ

0

5

5 0

◄ ►

1 0 AMPL

2. When the Trigger signal source from external is selected, the Rate, Phase, and Symmetry will disable as those functions are workable on internal trigger mode only.

3.

It won’t make any change on execution and result by taking different step sequence.

4. The Trigger function of GFG-3015 must meet the important setting condition with the Main frequency higher than Trigger rate frequency!



Example of the Setup of Trigger Function

To set the following conditions:

 Main function: Sine Wave.  Trigger Source: INT  Main Frequency: 5kHz.  Trigger Signal rate: 1kHz.  Main Output Amplitude: 10Vpp.  Trigger Phase: 30º.  Trigger type:

Multi-trigger

 Trigger Signal Symmetry: 50%.

Procedure:

Press to select SINE wave for main output.



Press in sequence.



Then press in sequence.



Press to set Trigger Type on Multi-Trigger .



Press to select the source from internal signal.



INT/EXT

Press in sequence.



SWP CF

Press in sequence.



Press in sequence.



Press .



The Trigger Function will perform on output terminal. Please see Figure (1)



Besides, you can use and the Rotate Knob to modify the value you need.



Another Example of the Setup of Trigger Function

All the setting conditions are the same as above mentioned examples except the one set “Single-trigger” of the Trigger Type.

 Trigger type:

Single-Trigger

Procedure:

Press to set Trigger Type to Single-Trigger .



The Trigger Function will perform on output terminal. Please see Figure (2)



GFG-3015 p.29

KHz/Vrm

s

SIGL/MUT

TRIG EXT

Hz/Vpp

FUNC

FREQ 1

1 0 AMPL

Figure (2)

Figure (1)

6.14 Setup of GATE and BURST

The GFG-3015 provides GATE or BURST function performed with different Trigger settings. If want to set to GATE or BURST function, just proceed some simple calculation and some Trigger setting. Please refer the setup of GATE or BURST function as the example below.



Example of the Setup of BURST

 The detailed calculated formula for BURST as below:

1. Trigger Rate period = Burst period.

2. Symmetry of Trigger signal =100% - {{[Burst period – (Burst count × Main

Frequency period)]/ Burst period }×100%}

 The Burst period > Burst Count × Main Frequency period.  Set the Trigger Type to Multi-Trigger type.  Because the Frequency and Symmetry of Trigger signal have their own

accuracy that is different than main frequency, therefore, when the above formula is used to calculate the Symmetry, the value might have to be modified to match the Burst count as desired.

To set the following conditions for BURST function example:

 Main function: Sine Wave.  Burst period: 10ms  Main Frequency: 1kHz(1mS).  Burst count: 3.  Main Output Amplitude: 10Vpp.

Procedure:

The calculation of setting:



1.

Trigger Rate = Burst period = 10mS(100Hz)

2.

Symmetry of Trigger signal =100% - {{[10mS – (3 × 1mS)]/10mS}×100%}= 30%

Press to select Sine wave for main output.



Press in sequence.



Then press in sequence.



Press to set Trigger Type on Multi-Trigger .



Press to select the source from internal signal.



p. 30 GFG-3015

DEG/%

PHASE

TRIG ON

Hz/Vpp

KHz/Vrm

s

SIGL/MUT

TRIG EXT

Hz/Vpp

SYM

INT/EXT

RATE

.

0

1

3 0

◄ ►

0 0

FUNC

FREQ 1

1 0 AMPL

Press in sequence.



SWP CF

Press in sequence.



Press in sequence.



Press .



The BURST Function will perform on output terminal. Please see Figure (3)

In addition, you can use and the Rotate Knob to modify the value of Trigger signal Symmetry and set the Burst count you need.

Note: 1.

It won’t make any change on execution and result by taking different step

sequence.

2. Use suitable external signal to set the BURST function you need.



Example of the Setup of GATE

 The detailed calculate formula of GATE function as below:

1.Trigger Rate period = Gate period.

2.Symmetry of Trigger signal = 100% - {[(Gate period – Open Gate time)/

Gate period] ×100%}

 The Gate period > Open Gate time.  Set the Trigger Type to Multi-Trigger type.  Because the Frequency and Symmetry of Trigger signal have their own

accuracy that is different than main frequency, therefore, when the above formula is used to calculate the Open Gate time, the value might have to be modified to close your desire. It’s a normal phenomenon that the Open Gate time may have less accuracy than your wish.

To set the following conditions for Gate function Example:

 Main function: Triangle Wave.  Gate period: 10mS  Main Frequency: 1kHz(1mS).  Open Gate Time: 6mS.  Main Output Amplitude: 10Vpp.

Procedure:

The calculation of setting:



1. Trigger Rate = Gate period = 10ms(100Hz)

2. Symmetry of Trigger signal =100% - {[(10mS – 6mS)/10mS]×100%}= 60%

Press to select Triangle wave for main output.



Press in sequence.



Then press in sequence.



Press to set Trigger Type to Multi-Trigger.



Press to select the source from internal signal.



GFG-3015 p.31

DEG/%

PHASE

TRIG ON

Hz/Vpp

INT/EXT

RATE

SYM

GATE

0

1

6 0

0 0

◄

►

SHIFT

Figure (3)

Figure (4)

Press in sequence.



SWP CF

Press in sequence.



Press in sequence.



Press .



The GATE Function will perform on output terminal. Please see Figure (4).

In addition, you can use and the Rotate Knob to modify the value of Trigger signal Symmetry and set the Open Gate Time you need.

Note: 1.

It won’t make any change on execution and result by taking different step

sequence.

2. Use suitable external signal to set the GATE function you need.

6.15 Setup of External Counter

The GFG-3015 provides a high performance external frequency counter and with 6 digits counter and up to 150MHz high frequency range with high resolution.

 Press button, the EXT and one of the Gate time indicated

LEDs will light up, also, the GATE will be flashing according to the Gate time of Counter (In Counter Functions LEDs area). Now, the external counter is in enabling status.

INT/EXT

 When the is pressed, the Gate time LEDs will be according to the

cycle of 0.01S, 0.1S, 1S, and 10S to display. The Different Gate time will provide different resolution of counter. So users can use the key to choose whatever the resolution they need.

The detailed relation among the Test frequency, the Gate time, the State

LEDs and minimum resolution is as below:

Input Test

Frequency

1Hz

p. 32 GFG-3015

Gate Time Display Value State of LEDs Resolution

0.01 Sec

1.0000

0.1 Sec 1.00000

Hz Hz

100μHz

10μHz

GATE

SHIFT

1 Sec 1.00000

10 Sec 000.000

Hz

mHz, OVER

10μHz

1μHz

10Hz

100Hz

1kHz

1MHz

0.01 Sec

10.000

0.1 Sec 10.0000 1 Sec 10.0000

10 Sec 0.00000

0.01 Sec

100.00

0.1 Sec 100.000 1 Sec 100.000

10 Sec 00.0000

0.01 Sec

1.0000

0.1 Sec 1.00000 1 Sec 1.00000

10 Sec 000.000

0.01 Sec

1.0000

0.1 Sec 1.00000 1 Sec 1.00000

10 Sec 000.000

0.01 Sec

10.0000

Hz Hz Hz

Hz, OVER

Hz Hz Hz

Hz, OVER

kHz kHz kHz

Hz, OVER

MHz MHz MHz

kHz, OVER

MHz

1mHz

100μHz 100μHz

10μHz

10mHz

1mHz 1mHz

100μHz

100mHz

10mHz 10mHz

1mHz

100Hz

10Hz 10Hz

1Hz

100Hz

10MHz

100M Hz

0.1 Sec 0.00000 1 Sec 0.00000

10 Sec 000.000

0.01 Sec

100.000

0.1 Sec 00.0000 1 Sec 0.00000

10 Sec 000.000

MHz, OVER MHz, OVER

kHz, OVER

MHz MHz, OVER MHz, OVER

kHz, OVER

10Hz 10Hz

1Hz

1kHz

100Hz

10Hz

1Hz

Note: When OVER LED is light on, The means that there are still more values

than 6 digits on the Display. User can set more high Gate time to check it.



Example of the External Counter

To set the following conditions:

 Counter mode: External.

Procedure:

INT/EXT

Press to select External source for Counter mode.



Connect the testing signal with “Counter Input BNC connector”.



INT/EXT

Press to select the Gate time of you need.



The correct frequency will be displayed. (Parameter display Area (A))



GFG-3015 p.33

KHz/Vrm

s

Hz/Vpp

6.16 THE VCF Function

Hope that Main output will output

FUNC

FREQ 5

1 0 AMPL

1 0

The GFG-3015 also provides the function of Voltage control frequency (VCF). Input a voltage from 0 to 10V to the instrument can change the main output frequency. In other word, put a different input voltage will get a different main frequency. Basically, If user put a voltage that from 0 to 10V to instrument then the variation of main frequency will over 100 times. But that just appear in Same “Frequency variation Range”. Because whole frequency range (0.01Hz ~ 15MHz) of GFG-3015 is composed of 8 frequency range (The detail is as below). So User’s voltage just can control at same frequency range. For example, User can’t make the main frequency to 10kHz on range 7 by VCF input voltage. It must change to range 6 or 5.

VCF Frequency variation

Number of Range Setting Frequency Range

8 1.5001MHz~15.0000MHz 7 150.01kHz~1.50000MHz 15kHz~1.5MHz 6 15.001kHz~150.000kHz 1.5kHz~150kHz 5 1.5001kHz~15.0000kHz 150Hz~15kHz 4 150.01Hz~1.50000kHz 15Hz~1.5kHz 3 15.01Hz~150.00Hz 1.5Hz~150Hz 2 1.51Hz~15.00Hz 0.15Hz~15Hz 1 0.01Hz~1.50Hz 0.01Hz~1.5Hz

The input voltage must be input with VCF BNC connector. If need to change “The frequency variation range”, proceed 6.3 The Setup of Frequency to modify the main setting frequency.



Example of the Setup of VCF

Range

150kHz~15MHz

To set the following conditions:

 Main function: Sine Wave.  Main Output Amplitude: 10Vpp.



10kHz on External VCF function.

Procedure:

Press to select SINE wave for main output.



Press in sequence.



Then press in sequence to



choose suitable main output frequency for corresponding “VCF Frequency

variation Range”.

Input about DC 9V to “



You will get about 10kHz sine signal from Main Output connector.



VCF input BNC connector”.

Also, you can get 10kHz from VCF frequency variation range with the same

procedure as above description by setting different value of input VCF voltage. Please refer to the following:

p. 34 GFG-3015

KHz/Vrm

s

KHz/Vrm

s

1) Press in sequence to choose suitable

FREQ 5 1

FREQ 5 1 0

main output frequency for corresponding “VCF Frequency variation

2) Input about DC 3.3V to “

Range”.

VCF input BNC connector”.

3) You will get about 10kHz Sine signal from Main Output connector.

Note: 1.

It won’t make any change on execution and result by taking different step

sequence.

2. If need to change difference frequency variation range in order to get maximum variation (more than 100 times) at the same range, it is to be suggested to set the main frequency on the top of each frequency range.

6.17 THE GCV Output Function

The GFG-3015 provides the function of Generate control Voltage (GCV). User can get a voltage from 0.2V to 2V from the instrument and the voltage changes following the different main output frequency setting. In other words, if change the setting of the main frequency, the voltage got from GCV output BNC connector will be changed. Basically, If user set any main frequency then It will get a relative voltage from instrument. But that just appear in same “Frequency Range”. Because whole frequency range (0.01Hz ~ 15MHz) of GFG-3015 are composed of 8 frequency range (The detail is as below). So the GCV output voltage (0.2 to 2V) just appear on each same frequency range.

Setting Frequency Range

15.0000MHz ~ 1.5001MHz

1.50000MHz ~ 150.01kHz

150.000kHz ~ 15.001kHz 2 ~ 0.2V

15.0000kHz ~ 1.5001kHz 2 ~ 0.2V

1.50000kHz ~ 150.01Hz 2 ~ 0.2V

150.00Hz ~ 15.01Hz 2 ~ 0.2V

15.00Hz ~ 1.51Hz 2 ~ 0.2V

1.50Hz ~ 0.01Hz 2 ~ 0.2V



Example of the Setup of GCV

To set the following conditions:

 Get 2V from GCV output BNC connector.

GCV Output Voltage

2 ~ 0.2V 2 ~ 0.2V

Procedure:

Press in sequence.



You will get about 2V from GCV output BNC connector.



Also, you can get 2V from another frequency ranges with the same

procedure as above description by setting different frequency value. Please refer to the following:

1) Press in sequence.

GFG-3015 p.35

2) You will get about 2V from GCV output BNC connector.

Note: It won’t make any change on execution and result by taking different step

sequence.

6.18 THE TTL Signal Output Function

The GFG-3015 provides a compatible TTL level signal from TTL Output BNC connector. The frequency of TTL signal output depends on the main output frequency. If need to modify the frequency of the signal, please refer to the procedure of 6.3 The Setup of Frequency. The amplitude of the signal is fixed at ≧3Vpp which can not be changed.



Example of the Setup of TTL Output

To set the following conditions:

 Main Frequency: 5kHz.  Signal Type: TTL Level.

Procedure:

Set the main frequency to 5kHz(refer to 6.3 The Setup of Frequency).



Connect with “



You will get a 5kHz/TTL Level signal from the connector.



TTL output BNC connector”.

6.19 THE SYNC Signal Output Function

The GFG-3015 provides a synchronous signal with main output from SYNC Output BNC connector. The frequency of SYNC signal output synchronizes with main output. If need to modify the frequency of the signal, please refer to the procedure of 6.3 The Setup of Frequency. The amplitude of the signal is fixed at >1Vp-p open circuit which can not be changed.



Example of the Setup of Sync Output

To set the following conditions:

 Main Frequency: 10kHz.  Signal Type: Synchronize with main output.

Procedure:

Set the main frequency to 10kHz(refer to 6.3 The Setup of Frequency).



Connect with “



You will get a 10kHz signal synchronized with main output from the



SYNC output BNC connector”.

connector.

6.20 Remote Control - RS232 Interface

The GFG3015 contains a DB 9-pin, male RS-232 connector for serial communication with a computer or terminal. The GFG-3015’s RS-232 interface is configured as an RS-232 “Data Terminal Equipment” so that data is sent from pin 3 and received on pin 2. For remote controls, the RS-232 interface has to be connected with a computer or terminal.

p. 36 GFG-3015



Pin Assignments

The Pin assignments of the RS232 connector on the rear panel for DB-9-D.The details are listed below.

1 No connection 2 Receive Data (RxD) (input) 3 Transmit Data (TxD) (output) 4 No connection 5 Signal Ground (GND) 6 No connection 7 No connection 8 No connection 9 No connection



DB9 to DB9 Wiring

The wiring configuration is used for computer with DB9 connectors that configured as Data Terminal Equipment.

Figure 6.20.1 DB9 to DB9 wiring

When the GFG-3015 is set up with a RS232 interface, please check the following points:

 Do not connect the output line of one DTE device to the output line of the

other.

 Many devices require a constant high signal on one or more input pins.  Ensure that the signal ground of the equipment is connected to the signal

ground of the external device.

 Ensure that the chassis ground of the equipment is connected to the chassis

ground of the external device.

 Do not use more than 15m of cable to connect devices to a PC.  Ensure the same configurations are used on the device as the one used on

PC terminal.

 Ensure the connector for the both side of cable and the internal connected line

are met the demand of the instrument.



Communication Mode

The same baud rate and data format must be set to the instrument and the computer. The baud rate of the RS-232 interface can be set as listed in the following table.

GFG-3015 p.37

300 Baud 600 Baud 1200 Baud 2400 Baud 4800 Baud 9600 Baud 19200 Baud

The data transmission format is N-8-1 (no parity bit, 8 data bits, 1 stop bits).



Computer’s Connection

A personal computer with a COM port is the essential facility in order to operate the instruction via RS232 interface.

The connections between GFG-3015 and computer are as follows:

 Connect one end of a RS232 cable to the computer.  Connect the other end of the cable to the RS232 port on the GFG-3015.  Turn on the GFG-3015.  Turn on the computer.



The RS232 connection testing

If you want to test whether the RS232 connection is working or not, you can send a command from computer. For instance, using a terminal program send the query command (uppercase) *IDN?

Should return the Manufacturer, model number and firmware version in the following format: GW,GFG3015,V.1.00

If you do not receive a proper response from the GFG-3015, please check if the power is on, the RS232 configurations are the same on both sides, and all cable connections are active.

6.21 Commands Syntax

If you want to transfer any of the instructions to an instrument, there are three basic elements must be included.

 Command header  Parameter (if required)  Message terminator or separator



Command Header

The command header has a hierarchical structure that can be represented by a command tree.

p. 38 GFG-3015

:SOURce

:SWEep :WAVeform ?

:SYM ? :SPACing

Root node

Lower-lev el

nodes

1

(Linear )

2

(LOG )

Leaf node

The top level of the tree is the root level. A root node is located at the root level. A root node and one or more lower-level nodes form a header path to the last node called the leaf node. The command header is configured by header path and leaf node. The below Figure shows the command header for the leaf node indicated.

:SOURce:SWEep:SPACing ?

Root Node

Header Path

Command Header

Leaf Node



Parameter

If the command has parameters, the values have to be included. In this manual, when we express the syntax of the command, the < > symbols are used for enclosing the parameter type. For instance, the syntax of the command in the following Figure includes the Boolean parameter type

NOTE:

Do not include the <, >, or | symbols when entering the actual value for a

parameter.

:SOURce:SWEep:SPACing <NR1>

Parameter

Type

Space

Command Header with Parameter

GFG-3015 p.39

The following Table defines the Boolean and other parameter types for the GFG-3015.

Parameter Type

Description

Example

Boolean Boolean numbers or values 1

0 NR1 Integers 0, 1, 18 NR2 Decimal numbers 1.5, 3.141, 8.4 NR3 Floating point numbers 4.5E-1, 8.25E+1

NRf NR1, NR2, or NR3 1, 1.5, 4.5E-1

Parameter Types for Syntax Descriptions

For the actual value of the parameter type <Boolean>, you have to enter 0 instead of “OFF” or enter 1 instead of “ON”. The following example includes both the header and a value for the parameter type:

:SOURce:TRIGger:STATe 0

The parameter values which appear in this manual are often separated by a vertical line. This vertical line means the word "or". For example, values for the parameter <Boolean> are 0|1 This means "0 (off) or 1 (on)", any single value is a valid parameter.



Message Terminator

As there is no signal of end message on RS232 bus, therefore use LF (Line Feed, 0 × 0A, or ASCII ‘\n’) as message of terminator. When a series of

commands are sent to the instrument, they must add a LF to be a judgment for message terminator. As for query command, the return message of the instrument is also added a LF for PC to judge message terminator.



Entering Commands

The standard, which governs the commands setting for the GFG-3015, is allowed a certain amount of flexibility when you enter commands. For instance, you can abbreviate many commands or combine commands into one message to send to the GFG-3015. This flexibility, called friendly listening, saves programming time and makes the command setting easier to be remembered and used.



Command Characters

The GFG-3015 is not sensitive to the command characters. You can enter commands in either uppercase or lowercase. You can precede any command with white space characters. You must, however, use at least one space between the parameter and the command header.

p. 40 GFG-3015



waveform

Abbreviating Commands

Most commands have both long form and short form. The list for each command in this section shows the abbreviations in upper case. For instance, you can enter the query

:SOURce:TRIGger:STATe ? simply as:

:SOUR:TRIG:STAT ?

6.22 The Commands of RS-232 Serial Interface



Common commands

Command Function Parameter Arguments

*CLS Clear status command None *IDN? Identification query None *RCL Recall command <NR1> <0~9> *SAV Save command <NR1> <0-9> *RST Default setting



Commands of the instrument

Command Function

:SYSTem:ERR ?

:FUNCtion:WAVeform

:FUNCtion:WAVeform ?

:FREQuency :FREQeency ? :AMPLitude:VOLTage

:AMPLitude:VOLTage ?

:AMPLitude:UNIT

:AMPLitude:UNIT ? :OFFSet :OFFSet ? :DUTY :DUTY ? :SOURce:WAVeform

Check the type of error messages Set the waveform of main frequency

Check the present of main frequency Set the main frequency Check the main frequency Set the value of output amplitude Check the value of output amplitude Set the unit of amplitude

Check the unit of amplitude Set the voltage of offset Check the voltage of offset Set the value of duty Check the value of duty Set the waveform of modulation mode

Parameter

None

<NR1> <1>Sinusoid

None

<NRf> Numeric data None <NRf> Numeric data

None

<NR1> <1>Vpp

None <NRf> Numeric data None <NR1> Numeric data None <NR1> <1>Sinusoid

Arguments

<2>Triangle <3>Square

<2>Vrms <3>dBm

<2>Triangle <3>Square

GFG-3015 p.41

waveform

Command Function

:SOURce:WAVeform ?

:SOURce:STATe

:SOURce:STATe ?

:SOURce:SOURce

:SOURce:SOURce ?

:SOURce:MODAM:RATe :SOURce:MODAM:RATe ? :SOURce: MODAM:SPAN :SOURce: MODAM:SPAN ? :SOURce: MODAM:SYM :SOURce: MODAM:SYM ? :SOURce: MODFM:RATe :SOURce: MODFM:RATe ? :SOURce: MODFM:SPAN :SOURce: MODFM:SPAN ? :SOURce: MODFM:SYM :SOURce: MODFM:SYM ? :SOURce:SWEep:STARt

:SOURce:SWEep:STARt ?

:SOURce:SWEep:STOP

:SOURce:SWEep:STOP ?

:SOURce:SWEep:CENTer

:SOURce:SWEep:CENTer ?

:SOURce:SWEep:SPAN :SOURce:SWEep:SPAN ?

:SOURce:SWEep:RATe :SOURce:SWEep:RATe ?

:SOURce:SWEep:SYM :SOURce:SWEep:SYM ?

Check the present of modulation mode Set the modulation function

Check the modulation function Set the modulation source

Check the modulation source Set the value of AM Rate Check the value of AM Rate Set the value of AM span Check the value of AM span Set the value of AM SYM Check the value of AM SYM Set the value of FM Rate Check the value of FM Rate Set the value of FM span Check the value of FM span Set the value of FM SYM Check the value of FM SYM Set the value of sweep start frequency Check the value of sweep start frequency Set the value of sweep stop frequency Check the value of sweep stop frequency Set the value of sweep center frequency Check the value of sweep center frequency Set the value of sweep span Check the value of sweep span Set the value of sweep rate Check the value of sweep rate Set the value of sweep SYM Check the value of sweep SYM

Parameter

None

<NR1> <0>OFF

None

<NR1> <0>Internal

None

<NRf> Numeric data None <NR1> Numeric data None <NR1> Numeric data None <NRf> Numeric data None <NR1> Numeric data None <NR1> Numeric data None <NRf> Numeric data

None

<NRf> Numeric data

None

<NRf> Numeric data

None

<NRf> Numeric data None

<NR1> Numeric data None

Arguments

<1>AM <2>FM <3>Sweep

<1>External

p. 42 GFG-3015

<1> External

Command Function

:SOURce:SWEep:SPACing

:SOURce:SWEep:SPACing ?

:SOURce:TRIGger:RATe

:SOURce:TRIGger:RATe ?

:SOURce:TRIGger:STATe

:SOURce:TRIGger:STATe ? :SOURce:TRIGger:PHASe

:SOURce:TRIGger:PHASe ?

:SOURce:TRIGger:MODe

:SOURce:TRIGger:MODe ? :SOURce:TRIGger:SOURce

Set the method of sweep

Check the method of sweep Set the value of trigger rate Check the value of trigger rate Set the trigger state

Check the trigger state Set the value of trigger phase Check the value of trigger phase Set the trigger mode

Check the trigger mode Set the trigger source

Parameter

<NR1> <0>Linear

None

<NRf> Numeric data

None

<NR1> <1>ON

None <NR1> Numeric data

None

<NR1> <0>Single

None <NR1> <0> Internal

Arguments

<1>LOG

<0>OFF

<1>Mutiple

:SOURce:TRIGger:SOURce ? :SOURce:TRIGger: SYM

:SOURce:TRIGger: SYM ?

:SOURce:COUNter:GATe

:SOURce:COUNter:GATe ?

:SOURce:COUNter:SOURce

:SOURce:COUNter:SOURce ?

Check the trigger source Set the value of trigger SYM Check the value of trigger SYM Set the gate time of counter

Check the gate time of counter Set the counter source

Check the counter source

None <NR1> Numeric data

None

<NR1> <0>001sec

<1>01sec <2>1sec <3>10sec

None

<NR1> <0> Internal

<1> External

GFG-3015 p.43



Error Messages

 Command Error

Error Code

SCPI Error Code／／／／Explanation

-100 Command error

-102 Syntax error

 Execution Error

Error Code

SCPI Error Code／／／／Explanation

-220 Parameter error

-221 Settings conflict

-222 Data out of range

6.23 The Examples of the Communication Interface Software

/* ************************************************************************ * Microsoft Visual C++ 6.0 for RS-232 * * This programming example shows how to communicate * PC and instrument via RS232. * * "*IDN?\n" : Ask the Manufacturer, model number * and firmware * ":FREQuency 1000.0\n" : Set Frequency=1000Hz * ************************************************************************** */

#include <stdio.h> #include <windows.h>

HANDLE InitCom (int Error_Value);

char *Error_Message[6]={ "Error Create File\n", "Error SetCommTimeous\n", "Error SetCommState\n", "Error SetupComm\n", "Error GetCommState\n", "Error EscapeCommFunction\n" };

void main() { char command_line[100]; char Receive_Data[100]; char Read_Machine_Number[10] ={"*IDN?\n"}; DWORD dwcommand_len=0,dwWritten=0,dwRead=0; int i,error_value=0; HANDLE hComm;

p. 44 GFG-3015

/*---------------- initial Data ---------------*/ for(i = 0; i<100;i++) command_line[i]=0; for(i = 0; i<100;i++) Receive_Data[i]=0;

/*---------------- Create Comm_port -----------*/ hComm = InitCom(error_value);

/*---------------- Send *IDN? -----------------*/

dwcommand_len =sprintf( command_line,"*IDN?\n"); // ‘\n’ is message

// terminator

WriteFile(hComm,command_line,dwcommand_len,&dwWritten,NULL);

Sleep(1000); // delay 1 sec for instrument response

ReadFile(hComm,Receive_Data,100,&dwRead,NULL);

Receive_Data[strlen(Receive_Data)] = 0x00; printf("\nReceive_Data = %s\n",Receive_Data);

/*-------------- Send FRQuency = 1000Hz -----------*/

dwcommand_len =sprintf( command_line,":FREQuency %3.0f\n",1000.0);

// ‘\n’ is message terminator WriteFile(hComm,command_line,dwcommand_len,&dwWritten,NULL);

CloseHandle(hComm); }

/*---------------------------------------------*/ /* Initial RS-232 */ /*---------------------------------------------*/ HANDLE InitCom(int Error_Value) { HANDLE hComm; COMMTIMEOUTS CommTimeOuts;

hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,NULL, NULL );

if (hComm == INVALID_HANDLE_VALUE) { printf("%s",Error_Message[0]); return FALSE; }

/*----------------- Timeout -------------------*/ CommTimeOuts.ReadIntervalTimeout = 1; CommTimeOuts.ReadTotalTimeoutMultiplier = 0; CommTimeOuts.ReadTotalTimeoutConstant = 1000; CommTimeOuts.WriteTotalTimeoutMultiplier = 0; CommTimeOuts.WriteTotalTimeoutConstant = 5000; if(!SetCommTimeouts(hComm, &CommTimeOuts )) { printf("%s",Error_Message[1]); return FALSE; }

GFG-3015 p.45

/*-----------------------------------------------*/

/* set baud rate */

/* ByteSize */

/* parity */

/* StopBits */

/*-----------------------------------------------*/

DCB dcb = {0};

dcb.DCBlength = sizeof(dcb); if (!GetCommState(hComm, &dcb)) { printf("%s",Error_Message[2]); return FALSE; }

dcb.BaudRate = CBR_9600; // current baud rate dcb.ByteSize = 8; // number of bits/byte, 4-8 dcb.Parity = 0; // 0-4=no,odd,even,mark,space dcb.StopBits=0; // 0,1,2 = 1, 1.5, 2

if (!SetCommState(hComm, &dcb)) { printf("%s",Error_Message[3]); return FALSE; }

/*---------------- Set In,Out Queue -----------*/ if(!SetupComm(hComm, 8196,8196)) { printf("%s",Error_Message[4]); return FALSE; }

if (!EscapeCommFunction(hComm, SETDTR)) { printf("%s",Error_Message[5]); return FALSE; }

return hComm;

}

p. 46 GFG-3015

6.24 The Error message of instrument

The operation of GFG-3015 is a whole digitizing operation user interface. Every

parameter will be showing by numerically and every input value keyed in with

numerical keys. So when key in the value to instrument, it might cause some

mistake, now the GFG-3015 will show a corresponding error code on the

Display a few seconds later for User to correct the data. (Please refer to the

specification or Operation ways). The detailed explanation is as following table:

Error Code Explanation

E01 Frequency over range E02 Frequency over Resolution E03 Amplitude over range E04 Amplitude over resolution E05 Offset over range E06 Offset over resolution E07 Duty over range E08 Duty over resolution E09 Mod rate over range E10 Mod rate over resolution E11 Mod sym over range E12 Mod sym over resolution E13 Sweep freq over range E14 Sweep freq over resolution E15 AM span over range E16 AM span over resolution E17 FM span over range E18 FM span over resolution E19 Trigger phase over range E20 Trigger phase resolution E21 Store setting over settng numbers range E22 Recall setting over settng numbers range E23 Recall set is no data

GFG-3015 p.47

7. The Block Diagram and Description of the System

The block diagram of GFG-3015 consists of a micro processor unit (MPU), a Voltage control Frequency (VCF), many digital to analog converters (D/A) for corresponding block, a square and sine waveform Shaper, a modulation function generator, a Trigger signal generator, a Frequency Counter(GFC-9701), an output amplifier, an attenuator (ATT), and etc. The principles of generating waveforms and Function are shown as follows:

GFG-3015

GFG-3015 GFG-3015

VCF unit

GCV OUTPUT

DUTYCYCLE

D/A(+)

+CURRENT

SOURCE

SINEWAVE

SHAPER

OFFS ET ADJUS T

D/A

VCF INPUT

MAIN

FREQUENCY

D/A

DISPLAY

UNIT

MPU

POWER

DUTYCYCLE

FREQUENEY

COUNTER

(GFC-9701)

D/A(-)

-CURRENT SOURCE

PREAMP

TRIGGER

PHASE

D/A

DIODE

SWITCH

COUNTER

INPUT

BUFFER

AMPLIFER

C

T

LEVEL

DETECTOR

TRIGGER

SIGNAL

GENERATOR

SYC OUTPUT

WAVE FORM

TTL SHAPER

INT

EXT

TRIGGER

CHOICE

SQUARE SHAPER

MOD

TTL

AM/ON

AM

FUNCTION

TTL OUTPUT

MOD_FUNTION

MOD

OUTPUT

AMPLIFIER

D/A

GENERATOR

10KHz~0.01Hz

MOD INPUT

ATTENUATOR

OUTPUT

EXT

INT

MAIN

(1) Power

Provide many kind of DC power for every block of the instrument including ± 18V, ±15V and ±5V.

(2) MPU

The Micro Processor Unit is a powerful control center of the instrument that can control many key blocks through D/A converter including the Output waveform, the Frequency, Amplitude, the DC offset, the Duty and the setting the parameters of Sweep or modulation, even the Trigger function. It creates a friendly operation environment. In addition, it can read the output frequency through the powerful Counter (GFC-9701) and modify the output frequency value at the real time. Therefore, it also provides high accurate signal.

p. 48 GFG-3015

(3) V.C.F

Basically, the Voltage Control Frequency unit is to transform voltage into frequency. It consists of a main frequency D/A, a duty cycle D/A, a positive/negative constant current source, a diode switch unit, a buffer, a level detector and an integral capacitor, and etc. The MPU puts a specific value to the main frequency D/A which will generate a corresponding voltage for the reference of the duty cycle D/A, then two different polar voltages for current source unit will be generated by the duty cycle D/A, one is a positive voltage from the positive duty cycle D/A and the other is a negative voltage from the negative duty cycle D/A. The current source block will transform two different polar voltages of the duty cycle D/A output into two different polar correspond constant current. These currents will be charged or discharged by the diode switch unit to the integral capacitor CT, and the voltage of the CT will become a continuous symmetrical triangle waveform. The diode switch movement is controlled by the level detector and the voltage of level detector from the triangle waveform, so does the triangle wave oscillator. If the positive and negative duty cycle D/A has different values, then the current of charge and discharge will be different. Therefore, the triangle waveform should have unsymmetrical duty.

(4) Frequency setting

The same status as the VCF above, the MPU puts a specific value to the main frequency D/A, the VCF unit will generate a correspond frequency (Symmetrical triangle wave), then, input a desire frequency value to the instrument, the MPU will set the frequency accordingly.

(5) Description of every kind of Waveform

The GFG-3015 provides many kinds of waveforms including Sine, Triangle, Square, Ramp and Pulse. Please refer to the following for details:

1. Triangle and Ramp Waveform

The same status as the VCF above, the output voltage of the VCF unit is a symmetrical triangle wave which can pass the waveform choice, the output amplifier, the ATT, and the output through the Main Output terminal. Regarding the Ramp wave, if the positive and negative duty cycle D/A has different value, then the triangle waveform should have unsymmetrical duty, that is the positive and negative Ramp waveform.

2. Sine Waveform

The procedure of generating triangle waveforms is similar to that of generating the sine waveforms, except that the triangle signal can pass a sine wave shaper circuit between the VCF unit and the output amplifier, and the shaper circuit can change the waveform type from triangle to sine.

3. Square and Pulse Waveform

The procedure of generating the triangle waveforms is similar to that of generating the square waveforms. except that the triangle signal can pass a square wave shaper circuit (Comparator circuit) between the VCF unit and the output amplifier. Regarding the Pulse waveform, if the positive and negative duty cycle D/A has different value, then the square waveform should have unsymmetrical duty, that is the positive and negative Pulse waveform.

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(6) Amplitude and DC offset

The Amplifier of GFG-3015 is similar to lineally multiplier (EL4451). The amplitude of this amplifier varies with the different control voltage. The control voltage comes from the Amplitude of the D/A converter. The MPU puts a specific value to the D/A converter which will generate a corresponding voltage to main output Amplifier, from which, user will get different output amplitude. The procedure of the amplitude setting is similar to that of DC offset setting, except that there is another D/A converter (Offset adjust D/A) to change the DC offset of output amplifier.

(7) Modulation Function

The GFG-3015 provides two different kinds of modulation functions, one is Amplitude modulation and the other is Frequency modulation. The instrument has another internal independent function generator which can generate Sine, Triangle, and Square waveform with the frequency range from

0.01Hz to 10kHz, and the symmetry and amplitude of waveform are adjustable. The full function generator is used to make the source for modulation even trigger function. The detailed principles of modulation is as follows:

1. Amplitude Modulation

The AM function block is for general purpose of the Amplitude modulation circuit (MC1496), including a carrier signal input, an audio signal input and a modulation output. The output amplitude of carrier signal is decided by the audio signal. The carrier signal is obtained from the main waveform (can select Sine, Triangle and Square), and the audio signal is obtained from a internal

independent of function generator. Set all the parameters of Amplitude modulation by selecting the Waveform (modulation source), the Amplitude (Span), the Frequency (Rate) and the Duty (Symmetry) of the generator. The output of AM function block is to correct AM waveform and pass the output amplifier, the ATT, and the output through the Main Output terminal. The function includes the internal modulation and the external modulation with the same operation procedure, except that the modulation signal source is obtained from the external MOD input terminal.

2. Frequency Modulation

The principles of the VCF have been described previously, the voltage varies with the different frequency, and the signal obtained from the internal independent function generator is put to the main frequency D/A, then the frequency of the VCF will be according to this signal. Set all the parameters of the Frequency modulation by selecting the Waveform (modulation source), the Amplitude (Span), the Frequency (Rate) and the Duty (Symmetry) of the generator. The output of VCF will become FM function waveform and pass the waveform choice, the output amplifier, the ATT, and the output through the Main Out terminal. This function includes internal modulation and external modulation with the same operation procedure. The only difference with external modulation is that the modulation signal source will come from external MOD input terminal.

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(8) Sweep Function

1. LIN Sweep

The procedure of generating the LIN Sweep functions is similar to that of generating the FM function, except that the Ramp waveform is the only signal source.

2. LOG Sweep

The procedure of generating the LOG Sweep functions is similar to that of

generating the LIN Sweep functions, except that the signal source will pass a

LOG wave shaper circuit (This circuit be included MOD function generator

block).

(9) Trigger Function

The Trigger Signal Generator will generate special signal that can instruct the VCF unit to generate/stop waveform. The Signal obtained from the internal independent function generator must go through a TTL level shaper, as this block only accepts TTL compatible level. So can use the Frequency (Rate) and the Duty (Symmetry) of this generator to set the trigger phase and other parameters of Trigger Function. The output of VCF is to correct Trigger waveform and pass the waveform choice, the output amplifier, the ATT, and the output through the Main Out terminal. This function includes the internal and external Trigger with the same operation procedure, except that the Trigger signal will be obtained from the external Trigger input terminal.

(10) Frequency Counter

GW has designed its own full function counter chip, GFC-9701, with high frequency test range for the system. The counter has the internal and external counter mode for GFG-3015. The most important function for the internal counter mode is to show the main frequency (VCF) on the display. So we take a square signal from Square shaper and change the level to TTL compatible level by TTL shaper block, then the signal will connect with the counter (GFC-9701). Because the counter directly connects with the MPU system, so the MPU can get the correct frequency and show it on the Display. In addition, as the MPU can get the correct frequency anytime, so it can monitor the output frequency at all the time to keep the accuracy of output frequency. This function includes the internal and external counter mode with the same operation procedure, except that the external test signal has to pass a preamplifier circuit and change it to TTL compatible level.

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GW Instek GFG-3015 User Manual

Specifications and Main Features

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User Manual