GDS-2000A Quick Start Guide
Arbitrary Function Generator
Module
AFG-125 / 225 / 125P / 225P
QUICK START GUIDE
GW INSTEK PART NO. 82DS-23045MB1
ISO-9001 CERTIFIED MANUFACTURER
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protected by copyright. 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 Corporation.
The information in this manual was correct at the time
of printing. However, Good Will continues to improve
its products and therefore reserves the right to change
the specifications, equipment, and maintenance
procedures at any time without notice.
Good Will Instrument Co., Ltd. No. 7-1, Jhongsing Rd., Tucheng
Dist., New Taipei City 236, Taiwan.
OVERVIEW
The AFG-125/225/125P/225P are arbitrary function
generator modules for use with the GDS-2000A series
DSOs. The options require the DS2-FH1 module
extension bay to secure the module to the DSO. This
Quick Start Guide gives a quick overview to the
features, installation and basic operation for the AFG125/225/125P/225P. See the user manual for further
details.
The AFG-125P & 225P also incorporate a power supply
output with a selectable voltage output of 2.5, 3.3 or 5V.
The AFG-125/225/125P/225P are only supported with
GDS-2000A series DSOs with firmware version V1.19 or
above installed.
Main Features
Waveforms
•
Sine, Square, Ramp, Pulse, Noise,
ARB waveforms
ARB Features
•
4k memory/waveform length
•
10 bit amplitude resolution
•
•
1uHz ~ 25MHz max.
AM, FM, PM, FSK, SUM
modulation
Sweep function
Burst function
Channel tracking, coupling (AFG225)
50Ω and high load impedance
Internal / Manual trigger
Features
•
•
•
•
•
Front & Rear Panel
Front
Power Supply
Status LEDs
GND
SYNC Output


WP

CH1 Output



V V
V
Negative Output
Power Supply
Status LEDs
Negative Output
GND
Positive Output
SYNC Ouput
CH1 Output
CH2 Output
 

Positive Output
 
CH2 Output
Indicates the state of the power
supply (AFG-125P/225P only).
Negative output port.
Ground port
Positive output port
Sync signal output. Outputs a Sync
signal, Sweep marker, Burst
marker,or Arbitrary waveform
marker signal.
Signal 1 output.
Signal 2 output.
Front
Vent
USB Device Port
Input Power
 V
INPUT
 MX
Vent
Cooling vent.
USB Device Port The USB Device port is used to
supply power as well as
communication from the GDS-2000A
Input Power
A 5V 2A power brick can be used to
power the AFG-225.
Installation
AFG APP Installation
The AFG-125/225 modules require a separate APP
installation.
1.
Load the AFG.gz APP file onto a USB flash drive.
Insert the USB flash drive into the USB slot on the
front panel.
2.
Press
Utility
> File Utilities. Select the AFG.gz
file on the USB flash drive.
3.
Press
4.
After the installation has completed, restart the
oscilloscope.

twice to install the AFG APP.
Installing the DS2-FH1
The DS2-FH1 consists of 2 housings that are attached
to the feet on the underside of the case.
1.
Slip the housing over the front of the feet on the
GDS-2000A.
2.
Make sure that the rear tab clips securely over the
fan vent grid on the rear panel, as shown below.
1
2
Installing the AFG-125/225 Module
The AFG-125/225 modules are installed into the area
that is left between both of the DS2-FH1 housings.
1.
Slide the module into the slot that was created
between the DS2-FH1 housings. The front of the
module should be facing forwards.
2.
Make sure the module is secure. The module will
click into place when it is inserted properly.
3.
Make sure the GDS-2000A is turned off before
proceeding.
4.
Connect one end of the GTL-254 USB cable to the
rear panel USB Device port and to the USB Host
port. Connect the other end to the Device port on
the AFG-125/225, as shown below.
5.
Turn the power back on. The AFG-125/225 will
now be accessible in the Option menu.
Removing an Installed Module
1.
At the rear of the housings are two tabs. Pull both
tabs outwards.
2.
The module can now be slid out from the
housing.
USB Configuration
The USB Device port needs to be configured to provide
power for the AFG-125/225 if an external power
supply is not used.
1.
As shown previously in the “Installing the AFG125/225 Module” section, connect the GTL-254
USB cable.
2.
Press the
Utility
key and select USB Device
Port > USB Power.
The USB device port will now supply power to
the AFG-125/225.
Caution
The USB Device Port should be
reconfigured to “Computer” or
“Printer” when the AFG-125/225 is
not used. Failure to do so may damage
the PC or printer when connected in
the “USB Power” mode.
Accessing the Arbitrary Function Generator
Like all options, the AFG-125/225 options can be
accessed with the Option key.
O
1.
Press the
key and select AFG.
The AFG-125/225 is now ready to be used.
Basic Waveform Selection
The AFG-125/225 options have five selectable basic
waveforms.
1.
Select the output channel by pressing Signal 1
Setup or Signal 2 Setup.
2.
Press Waveform Mode and select a waveform type
from the side menu.
Sine, Square, Pulse, Ramp, Noise
3.
As appropriate, configure the frequency,
amplitude, offset and duty cycle/symmetry from
the side menu after a basic waveform is selected.
4.
Press Go Back from the bottom menu to return to
first level of the AFG menu.
ARB Waveform
The following will describe how to create and output
an arbitrary waveform.
1.
Select the output channel by pressing Signal 1
Setup or Signal 2 Setup.
2.
Press ARB from the bottom menu. Press ARB on
the side menu and toggle ARB On.
3.
Press Edit.
4.
Press Edit Method and select the method to edit
the arbitrary waveform.




Point/Line: Creates pulses of a user-defined
length and amplitude.
Diagonal: Creates a diagonal line between
Addr1/Data1 and Addr2/Data2.
Scale: Scales the ARB waveform between
0.1X ~ 10X.
Copy /Paste: Copies a section of the ARB
waveform and pastes it to a section of the
ARB waveform.
5.
Press Action to edit the ARB waveform using the
method selected above.
6.
Press Output Confirm from the side menu. Set the
area of the ARB waveform to output. Press
Confirm to confirm the area to output.
7.
Press more 1 of 2 and set the Frequency, Amplitude,
Offset and Rate of the ARB waveform.
Modulation
The following will describe how to modulate a carrier
waveform (shape) with the basic waveform shown
previously.
1.
Select a basic waveform as shown previously.
This will be used as the modulating (baseband)
signal.
2.
Press MOD from the bottom menu. Press MOD
on the side menu and toggle MOD On.
3.
Select the type of modulation on the side menu:
AM, FM, FSK, PM, SUM.
4.
Set the parameters for the chosen modulation
type from the side menu.
Sweep Modulation
The following will describe how to create a single
sweep waveform.
1.
Press Sweep from the bottom menu. Press Sweep
on the side menu and toggle Sweep On.
2.
Press Type and select Linear or Log.
3.
Press Start to set the start frequency, press Stop to
set the stop frequency.
4.
Press SWP Time and set the sweep time.
5.
Press Span to set the Span.
6.
Press Center to set the sweep center frequency.
7.
To set Markers, Press Marker, toggle Marker On
and press Frequency to set the marker frequency.
Burst Modulation
The following will describe how to create a burst
waveform.
1.
Press Burst from the bottom menu. Press Burst on
the side menu and toggle Burst On.
2.
Press N Cycle set the burst parameters.
3.
Choose Infinite for an infinite number of burst
cycles or press Cycle to set the number of burst
cycles for each period.
4.
Press Phase to set the phase of the burst.
5.
Press Period to set the period of each burst cycle in
seconds (not for infinite).
6.
Press TRIG Set to set the trigger settings: INT,
Manual Trigger and Delay.
Turn the Output Signal On
The following will describe how to turn the output
signal on and how to set some basic output
parameters.
1.
Press Go Back on the bottom menu to return to
first level of the AFG menu.
2.
Press Output Setup.
3.
Press Select and choose the output signal channel.
4.
Press Output and toggle the selected output On.

The signal will now be output.
5.
To toggle the load impedance between 50Ω and
High Z, press Load.
6.
For basic waveforms, press Phase to set the output
phase.
7.
On dual channel models, both output channels
can be phase-synchronized by pressing the
S_Phase soft-key.
State Display
The State Display function gives an overview of the
arbitrary function generator settings for both channels.
1.
Press State Disp to toggle the State Display on.
The State Display screen will appear in the center
of the display.
State Display Screen Overview
Signal 1
output state
Signal 2
output state
Signal 1
settings
Signal 2
settings
Signal 1
function
Signal 2
function
Dual Channel (AFG-225/225P only)
The following will describe the basic 2 channel
functions. Ensure both channels have already been
turned on in the Signal 1 Setup/ Signal 2 Setup menus.
1.
Press UTIL > Dual Chan from the first level of the
AFG menu level.
2.
From the side menu choose the relevant tracking
functions:

Freq Cpl turns frequency coupling on and
sets the type of frequency coupling: Offset,
Ratio

Ampl Cpl turns amplitude coupling on or off.

Tracking turns tracking on or off or turns
tracking on and inverts the output.

S_Phase synchronizes the phase of both
channels.
Preset (default settings)
1.
Press UTIL > Preset from the first level of the AFG
menu level.
2.
The factory default settings will be loaded
automatically.
Sync Signal Setup
The sync output signal is output from the SYNC port
on the front panel. The sync output signal is based on
either the channel 1 or channel 2 output signals. Each
periodic type of waveform output function has an
associated sync output signal.
1.
Press UTIL > Sync Setup from the first level of the
AFG menu level.
2.
Press Sync and toggle Sync on.
3.
Press Source and choose Signal 1 or Signal 2 as the
source signal to follow.
4.
Press Mode and select the SYNC signal mode:
5.

Marker forces the marker signal to be the
basis of the SYNC signal.

Carrier forces the carrier waveform to be the
basis of the SYNC signal.
Press Polarity and select the SYNC signal polarity.

Normal for normal polarity.

Inverted for inverted polarity.
Power Supply (AFG-125P/225P only)
The AFG-125P and AFG-225P have an additional
power supply function. The power supply has three
fixed output levels: 2.5V, 3.3V, 5V.
1.
Press Power Supply from the first level of the AFG
menu level.
2.
From the side menu press Power and turn the
power supply function on.
3.
Press voltage and choose which fixed voltage
output to use: 2.5V, 3.3V, 5V

The status led will indicate which voltage is
selected.
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