ISG500
5MHz DDS PROGRAMMABLE*
FUNCTION GENERATOR
(Direct Digital Synthesis)
USER MANUAL
* RS232 or USB standard Interface
Ethernet option
INSTRUMENTS ET SYSTEMES
ZI des Radars, 12 rue Diderot
F-91350 GRIGNY
Tel. : 33 (1) 69 02 31 56
Fax. : 33 (1) 69 02 08 93
www.instruments-systemes.fr
ISG500
07/06
2
Technical specifications..........................................
Safety......................................................................
Warranty................................................................
Maintenance...........................................................
Operation..................................................................
Using........................................................................
Front panel design........................................
Rear panel design........................................
Symbols used..............................................
Changing a fuse...........................................
Front panel Description…….......................
Rear panel Description...............................
Selecting signal function ….........................
Frequency adjustment...................................
Modulation adjustment.................................
Duty cycle adjustment..................................
Amplitude adjustment...................................
Offset voltage adjustment..............................
Output signal Activation...............................
Save and recall setup....................................
Main menu ....................................................…..
Menu Contrast………..…............................
Menu Output Limit........................................
Menu setup………………...........................
Menu Calibration.....................................….
Menu Interface.............................................
RS232 Interface..........................................
USB Interface………...................................
Ethernet Interface……….............................
Menu About.................................................
Remote control..........................................…
RS232 connection.........................................
USB connection…........................................
Ethernet connection......................................
Table of commands .................................….
Specifications
(18°C - 28°C)
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ISG500
Frequency /Period :
Range : 10mHz to 5MHz / 100s to 200ns
Accuracy : 10mHz min. / 100s max.
Display : 5 digits
Precision : 50ppm typ.
Function :
Sinus : 10mHz to 5MHz
Distorsion <0.1% (10mHz to 20kHz)
<1% (20kHz to 5MHz)
Square : 10mHz to 5MHz Rise/Fall time < 25ns
Pulse : Variable duty cycle from 5% to 95%
Triangle : 10mHz to 100kHz
Linearity <1% (10mHz to 100kHz)
Ramp : 200mHz to 100kHz
Linearity <1% (10mHz to 100kHz)
Sweep :
Internal : Linear or Logarithmic
Speed : 20ms to 20s
Frequency range : 200mHz to 5MHz
Trigger output : on BNC
External : BNC Input. 10kΩ typ.
Modulation (interne or externe):
AM : 0 to 100%
(BP : DC to 20kHz)
Internal : 500Hz sinus
External : 1Veff to 100%
FM : 100Hz to 5MHz (BP : DC to 5kHz)
FSK : 100Hz to 5MHz (BP : DC to 100 kHz)
PSK : 0 to 360°
(BP : DC to 100 kHz)
Output :
4
Impedance : 50Ω
Output Level : 10V max. crest to crest into 50Ω.
ISG500
20V max. crest to crest (open circuit load)
Attenuation : Variable from 0 to -60dB,
Offset : ±10V open circuit load, ± 5V into 50Ω
Offset level independent of the output level.
Limit (by menu) for output level : signal + offset
TTL output:
0-5V Rise /fall time <10ns
Counter :
100mHz to 100MHz ±1digit
5 digits display, BNC Input (1MΩ/22pF)
Protections :
overload ±60V and short-circuits for all Input/Output.
Display :
LCD White-Blue 2x 16 characters with Backlight
Interfaces :
RS232 (3 wires). Xon-Xoff Protocol
Transmission rate from 1200 to 19200 Baud
USB Interface B type
All functions and ranges programmable
Security :
CEI 1010-1 Class 1
Cat II 600V, Pollution Degree 2.
Power supply : 230 V ± 10 % 50-60Hz, max. 40VA max.
Fuse :
Incorporated in main plug 5x 20 mm T315mA/250V
Using
Temperature : 10-40 °C humidity < 80 %
Dimensions :
240 x240 x 88 mm (L x l x P)
Weight :
about 2,5kg
AC04Option : Ethernet Interface (manufacturer assembly)
Misc.:
All functions and parameters adjust by keys and encoder via the menu.
Rugged PVC Case with Handle
Supply with power cord, RS232 and USB cable
Safety
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ISG500
INSTRUMENTS et SYSTEMES certifies that this instrument has left the factory in
perfect working order, both in operation and safety.
This instrument has been designed and manufactured with great care to bring the best
possible safety to the user. If the instrument no longer functions properly or is damaged,
it must be immediately disconnected from the ac supply voltage, from the measured
circuit voltages and returned for repair.
Opening, maintenance, repair and calibration must be carried out by qualified and
approved personnel.
Warranty
Provided it is used under the recommended conditions, this instrument is guaranteed for
a two year period against manufacturing defects and component failure. This warranty
applies to material and workmanship. The instrument must be shipped back to an agreed
repair center. It will be repaired or replaced without charge. Warranty repairs are made
at the discretion of IES.
Maintenance
Your function generator does not need any specific maintenance. Whenever cleaning is
necessary, use a soft material. Avoid water or liquids that may penetrate inside.
Operation
Carefully unpack the instrument and make sure that it was not damaged during
transportation. Insert the power cord on the rear of the instrument and connect to the ac
supply. Switch power on by means of the power switch located on the rear panel.
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ISG500
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ISG500
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ISG500
Symbols used
Indicates the possibility of a dangerous voltage
Refer to the user manual
Changing a fuse
Before you change a fuse, disconnect the instrument from
all possible dangerous voltage!
The defective fuse must be replaced using a fuse of the same type and value :
 100 mA time delay fuse on the ac power mains input (T 100 mA)
Front Panel Description
The ISG500 Function generator had 4inputs /outputs BNC:
 one BNC for Main Output (50impedance).
 one BNC for Trigger output TTL level.
 one BNC for Trigger/Modulation input.
 one BNC for Counter Input.
Function keys permits to select output signal parameters (Frequency, signal type,
modulation, level, offset) and to activate output ON/OFF.
The x10, 10 keys and the rotating encoder modify directly the display value (ex :
frequency, level etc.)
The 6 keys under the LDC display had the following functions:
 The 3 keys directly under the display select the corresponding parameter on the
display.
 MENU keys display main menu.
 STORE/RECALL keys display setup menu.
 COUNTER key switches the instrument to counter mode.
MENU, STORE/RECALL, COUNTER and OUTPUT keys are always active
whatever is the function selected.
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ISG500
Rear panel Description
The rear panel of the ISG500 includes:





Plug with incorporated fuse for Main supply
Main Switch ON/OFF
USB connector type B
RS232 connector (3wires)
Ethernet connector (option) 10Mbps
Select the signal main function
Select the signal function by press the FUNCT key. The following menu appears :

SINUS
OK

Use the keys under the symbols  and  to choose the function. When the desired
function is displayed, press « OK » key to validate, the menu is automatically display off.
To quit the menu without select a choice, you must press another time the FUNCT key
or another function key.
The available signals are:
SINE, TRIANGLE, SQUARE, RAMP + (positive), RAMP – (negative), PULSE, DC,
LOGIQUE LEVEL.
In SINE, TRIANGLE, SQUARE, RAMP + or RAMP – function, it’s possible to
adjust frequency, level output and offset.
In IMPULSION function, it’s possible to adjust the pulse width independently of the
frequency with the DUTY key (see below).
In DC function, to change the level press OFFSET key and turn the rotating encoder.
In LOGIC LEVEL, the output signal is square and always refers to 0 volt. It’s possible
to change the level from -10V to 10V.
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ISG500
Frequency adjustment
To adjust the output frequency, press FREQ key.
The menu below is displayed:
Freq : 1000.0Hz

OK

The cursor indicates the active number which can change value with the rotating encoder.
To change active number, it is necessary to move the cursor under the number with the
keys under the symbols  and .
To modify the frequency quickly, it is also possible to use the keys x10, 10 to directly
multiply or divide it by 10. When the desired frequency is displayed, it is necessary to
press on the OK key to validate, the menu is automatically display off.
To quit the menu without select a choice, you must press another time the FREQ key or
another function key.
Pressing on FREQ key again, the display will switch in displayed mode of the period. To
come back in frequency displayed mode, press FREQ key once again.
Modulation adjustment
To select the modulation mode, press MOD key. The menu below is displayed:
Modulation : AM
ON
CHOICE

The available modulations are AM, FM, FSK, PSK, SWEEP et TTL.
To scroll the modulations, press , adjustment of the specific parameters to each
modulation is done by pressing CHOICE key and  key then press OK to validate.
To activate the modulation, press ON key, the menu below is displayed :
Modulation : AM
OFF
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ISG500
When the menu is displayed, all functions are disabled, it is only possible to disable the
modulation by pressing OFF key, come back on the base screen pressing MOD.
To quit the menu without select a choice, you must press another time the MOD key or
another function key.
Modulation parameters
AM Modulation :
Modulation depth from 0% to 100%
Source : Internal : 500Hz sine
External : the modulation depth is given by the amplitude of
the modulation signal from 0 to 1Veff corresponding to 0 to
100%.
FM Modulation:
Excursion : 100HZ, 300Hz, 1kHz, 3kHz, 10kHz, 30kHz, 100kHz,
300kHz et 1MHz.
Source : Internal or External
FSK Modulation:
Frequency : Choice of the modulated frequency (Frequency2).
Source : Internal or External
PSK Modulation:
Phase : Choice of the Phase angle from 0 to 360° (resolution 0,1°).
Source : Internal or External
Sweep :
Start Frequency
End Frequency
Duration
Sweep LIN or LOG
Source : Internal or External (trigger)
TTL Modulation:
Only active in SINUS, TRIANGLE, SQUARE and LOGICAL
LEVEL
Source : External only
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ISG500
Duty Cycle Adjustment
The Duty cycle adjustment is done by pressing DUTY key. The menu below is
displayed:
Duty : 50%

OK

The cursor indicates the active number which can change value with the rotating encoder.
To change active number, it is necessary to move the cursor under the number with the
keys under the symbols  and .
When the desired duty cycle is displayed, it is necessary to press on the OK key to
validate, the menu is automatically display off.
To quit the menu without select a choice, you must press another time the DUTY key or
another function key.
The duty cycle can change from 5% to 95% of the signal period.
Amplitude adjustment
To adjust the amplitude, press LEVEL key. The menu below is displayed:
Ampl : 10,0V

OK

The cursor indicates the active number which can change value with the rotating encoder.
To change active number, it is necessary to move the cursor under the number with the
keys under the symbols  and .
To modify the amplitude quickly, it is also possible to use the keys x10, 10 to directly
multiply it or divide it by 10. When the desired width of impulse is displayed, it is
necessary to press on the OK key to validate, the menu is automatically display off.
To quit the menu without select a choice, you must press another time the LEVEL key or
another function key.
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ISG500
Offset voltage (DC) adjustment
To adjust the offset voltage, press the OFFSET key. The menu below is displayed:
Offset : +0,0V

OK

The cursor indicates the active number which can change value with the rotating encoder.
To change active number, it is necessary to move the cursor under the number with the
keys under the symbols  and .
To modify the amplitude quickly, it is also possible to use the keys x10, 10 to directly
multiply or divide it by 10. When the desired width of impulse is displayed, it is
necessary to press on the OK key to validate, the menu is automatically display off.
To quit the menu without select a choice, you must press another time the LEVEL key or
another function key.
If the offset voltage isn’t NUL, the Offset LED is lighted. The Offset LED indicates the
presence of a DC component on the output signal.
Important : The offset voltage is completely independent of the output signal.
Output signal Activation
The output signal is commutated by a relay which is activated while pressing OUTPUT
key. If the red LED is lighted, the output signal is present on the BNC 50 Ω output. If the
red LED is not lit, the signal isn’t present on the BNC.
Important : All inputs and outputs are protected from overload and short circuit
until ±60V.
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ISG500
Save and recall Setup
This function permits to save and recall 10 setup of the front panel of the instrument.
The STORE/RECALL key displayed the setup menu of the instrument :
Setup : save
OK

To scroll the choice press , the display commutates between save and recall. The
saved is done pressing OK key to validate, the menu below is displayed:
Rappel : 0
OK
+
The recall number is incremented or decremented with « - » key and « + » key, then
press on OK to validate.
In saved mode, it is the active setup which is saved. In Recall mode, the instrument sets
up with the parameters of the selected setup.
The setup saved « 0 » is the start setup of the instrument.
It is also possible to come back in factory mode, see paragraph on the main MENU.
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ISG500
MAIN MENU
The MAIN menu is accessible pressing MENU key, the menu below is displayed :
Esc
Contrast
OK

To select a menu :
Contrast, Limit output, setup, calibrate, Interface and About » press  key until you
reach the desired menu then press OK.
menu Contrast
The menu below is displayed :
-
Adjust
OK
+
The contrast is done pressing « - » and « + » keys, then press OK key to validate.
menu Output Limit
This function permits to limit the output signal level, in order to protect the external
circuit. The menu below is displayed :
ON
Limit
OFF
Adjust
Pressing Adjust key, the menu below is displayed :
Limit :
6.6V
OK
The tension limit is adjusted with the rotating encoder, then press OK key to validate.
Important : The output limit (one adjustment) is the same value for the amplitude
of output signal and for the offset voltage.
When the limitation is active, the symbol "lim" is lit when you want to adjust the
amplitude of the output signal or the offset voltage.
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ISG500
Menu SETUP
The menu below is displayed :
Manufacturer Setup?
YES
NO
Pressing YES, the instrument comes back to the initial setup :
1000.0Hz
10.0V
SINE
+0.0V
Sub Menu Calibration
This menu is only accessible by one approved technician and within the framework of a
calibration machines.
Menu Interface
The menu below is displayed :
Esc
RS232
OK

To scroll the interface (RS232, USB, Ethernet), press  key, then OK to validate.
Menu RS232 Interface
Baud rate Selection : to select the baud rate, press the key choice. The following menu
is displayed :
Baud rate: 1200
Esc
OK

The Baud Rate available are 1200, 2400, 4800, 9600, 19200 bauds.
To scroll the speed, press , key, then OK to validate.
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ISG500
The menu below is displayed :
RS232
choice
Esc
ON
The interface activation is done by pressing ON key. Pressing Esc key, you come back
on the previous menu without any changes.
Menu USB Interface
The menu below is displayed :
USB
Esc
ON
The interface activation is done by pressing ON key. Pressing Esc key, you come back
on the previous menu without any changes.
The baud rate is 19200 Bauds.
Menu Ethernet Interface
The menu below is displayed :
Ethernet
Esc
ON
The interface activation is done by pressing ON key. Pressing Esc key, you come back
on the previous menu without any changes.
If the interface isn’t on the instrument (OPTION), the display is :
NO Interface
OK
Menu About
Indicates the type of the instrument, the version, the software and the interface used and
the Baud Rate. You quit the menu by pressing OK key.
ISG500
RS232
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1.02
9600
OK
ISG500
Remote control
RS232 Connection:
When it is connected to a computer, your generator ISG500 uses a protocol of software
dialogue rather (Xon - Xoff) than a control of material flow. Connection can thus be
carried out with simplest by a cord with three wire (Rxd, Txd and mass signal). The
connecting cable can be terminated at one end with a 9 pin connector and at the other end
with a 9 pin or 25 pins connector, this depends on the PC serial port connector. The
following connections should be followed:
It is better to use the cord provided with the instrument.
25 pin
female connector (PC)
9 pin female
connector (PC)
9 pin male connector
(instrument)
2
3
7
3
2
5
3
2
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USB Connection:
To connect your generator ISG500 to a computer, use the cord provided with the
instrument (type A-type B), there is 2 possibilities.
When the instrument is connected Windows ask for the drivers installation.
-To install the USB drivers : , insert the CD provided in the CDROM ( ex : D :/ ).
Follow the instructions of windows and indicates the following directory: D:\Driver
USB\ D10620 \
-To install a Virtual Com Port (VCP) to use the instrument with different software as
the hyperterminal of Windows. For this, follow the instructions of Windows’s
installation. Insert the CD provided in the CDROM ( ex : D :/ ). Follow the windows
instructions and indicates the following directory: D:\Driver USB\R9052154\
Once, the installation is complete, the instrument is ready to be control from the
computer.
Ethernet Connection: (OPTION)
Use a RJ45 cord to connect the instrument to the network.
Install the provided driver with the interface to set up the address of the ISG500
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ISG500
ISG500 Command List
Function
Signal
Parameters
Modulations
Modulations
Parameters
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SIG :SIN
SIG :TRI
SIG :SQR
SIG :RMP
SIG :RMN
SIG :IMP
SIG :DC
SIG :LOG
CNT :ON
CNT:OFF
AMP :1.3
OFF :-2,5
FRQ :123E3
WDT :50E-3
MOD :OFF
MOD :AMI
MOD :AMX
MOD :FMI
MOD :FMX
MOD :FSKI
MOD :FSKX
MOD :PSKI
MOD :PSKO
MOD :SWPI
MOD :SWPX
MOD : GATE
AM:75
FM:100
FM:300
FM:1K
FM:3K
FM:10K
FM:30K
FM:100K
FM:300K
FM:1M
STT:xxx
STP:xxx
TIM:100e-3
SWP :LIN
SWP:LOG
FSK:xxx
PSK:125.3
Sine
Triangle
Square
Positive Ramp
Negative Ramp
Impulsion
Continue voltage
Logical level
Counter in use
Counter off use
Output Amplitude in Volt : 1,3V
Offset voltage in volts (-2,5V)
Frequency in Hz (123kHz)
ISG500 : impulsion width in s (50ms)
Modulation unused (all modulations)
internal AM Modulation
external AM Modulation
internal FM Modulation
external FM Modulation
internal FSK Modulation
external FSK Modulation
internal PSK Modulation
external PSK Modulation
internal Sweep
external Sweep
gate Modulation
Modulation depth in % (75%)
FM Excursion 100Hz
FM Excursion 300Hz
FM Excursion 1kHz
FM Excursion 3kHz
FM Excursion 10kHz
FM Excursion 30kHz
FM Excursion 100kHz
FM Excursion 300kHz
FM Excursion 1MHz
Start Frequency
End Frequency
Sweep time in second (100ms)
Linear Sweep
Logarithmic sweep
Secondary frequency in modulation FSK
Phase angle in degree for modulation PSK
(125,3°)
ISG500
Output
Limit
Memory
LIM:3.6
LIM:ON
LIM:OFF
STO:X
RCL:X
Output Limit 3.6 V
Limit in use
Limit off use
Memory setup N°X (0 à 9)
Recall setup N°X
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