USER GUIDE
JANUARY, 2005
Rev. 1.3
Property of Ramsey Electronics, Inc.
Do not reproduce or distribute.
SG560 SIGNAL GENERATOR
Copyright Ramsey Electronics, Inc. 2005, All rights reserved
1
TABLE OF CONTENTS
Introduction
• Opening the Box..................................................................................................................4
• Quick Start .............................................................................................................................4
• Introduction...........................................................................................................................5
• Front Panel Overview .........................................................................................................6
Basic Use
• Generating a Frequency.....................................................................................................8
• Setting Generator Level .....................................................................................................8
• Muting the Generator.........................................................................................................8
• Setting Generator Offset....................................................................................................9
• Selecting a Waveform (Shape)........................................................................................9
• Saving and Recalling Memories ................................................................................... 10
• Adjusting Display Contrast............................................................................................. 10
Detailed information
• Examples of Waveforms and Offsets .......................................................................... 12
Property of Ramsey Electronics, Inc.
• Using the SG560 Differential Outputs........................................................................ 13
• Performing Manual Frequency Sweeps..................................................................... 13
• Setting Meter Output Impedance................................................................................ 14
• Filter Testing ....................................................................................................................... 14
• Signal Descriptions........................................................................................................... 15
• Dealing with Small Signal Levels and Noise ...............................................................0
Appendix
• CTS Tone Frequency List................................................................................................. 20
• Specifications ..................................................................................................................... 22
• Warranty .............................................................................................................................. 23
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2
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INTRODUCTION
Do not reproduce or distribute.
3
INTRODUCTION
Opening the Box
Your new SG560 includes:
1 SG560 Signal Generator
1 Operator’s manual
1 120/240 VAC Input, 12VDC/500mA Output External Power Supply
DATA
123
a
4
Property of Ramsey Electronics, Inc.
POWER
d
7
.
b
5
e
8
0
mute
SHIFT
MHz
c
6
f
9
V
kHz
mV
Hz
RCL
STO
SHIFT
FREQ
LEVEL
OFFSET
SHAPE
SG560 AUDIO GENERATOR
0-5MHZ
TRUE-DC
( )
-
( )
+
Do not reproduce or distribute.
Quick Start
Once you unpack the SG560 you can perform a this quick test to verify the operation.
1. Plug the included power supply into your AC outlet.
2. Plug the power supply into the rear of the SG560.
3. Turn on the SG560. The display will show the default Frequency, Level, and Offset.
4. Use the buttons to check their function. Press the FREQ button, then press 100kHz.
5. Use the jog dial to adjust the frequency in increments.
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INTRODUCTION
Introduction
The SG560 is more than an audio generator. It is also a signal generator that produces AC
signals with DC coupling at the output jacks like a digital signal generator. The versatility of
the SG560 will allow you to recreate many basic signals used in testing situations.
The SG560 allows you to generate square waves, sine waves, and triangle waves of any frequency from 0Hz to 5MHz in 0.1MHz steps. The frequency accuracy is tied to a crystal reference with an accuracy of
You can also step the frequency at any arbitrary increment. For example a step of 37.5kHz
can be entered and the dial or shift arrows can be used to step the frequency up and down
by this amount.
The SG560 uses a robust output stage for the final driver. It is derived from DSL modems and
is essentially a high power opamp. The opamp is capable of delivering 2.5W to a load before
going into protective shutdown. It is being used in a differential fashion which means that
any common mode noise is cancelled on the output. The output voltage can swing from 10V
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peak to peak with a 5V DC offset without clipping. For a negative DC voltage output, swap
the polarity of the cables attached to the jacks.
The SG560 allows digital entry of the output level with a resolution of 10mV. For example if
you enter 5.55V, the SG560 will generate a 5.55V peak to peak waveform at the jacks. The
SG560 has an additional option which allows the user to set the output impedance. It can be
50 ohms, 25 ohms, or or 0 ohms impedance at the output jacks. With a 50 ohm output im-
pedance a 50 ohm load will drop the output signal level by
ohms a 50 ohm load will not drop the level at all. The 25 ohm output setting can help when
driving a capacitive load; the 0 ohm setting should never be used with this type of load.
A DC offset may be entered; this is added (or subtracted if the jack connections are reversed)
to the AC signal. Rather than the output AC waveform being centered on 0VDC, a set DC voltage can be added to your signal. This allows the performance of tests that are not possible
with a basic audio signal generator. For example, a small circuit can be powered by the DC
offset as long as it requires less than 2.5W of power, and AC signals can be used to check for
noise or EMI immunity. The DC offset can also be used to recreate digital signals in the
square wave mode. For example, to create TTL square waves, enter 5V for the level, and 2.5V
for the offset. This will create the 5V (digital ‘1’) and the 0V (digital ‘0’) levels needed for testing and clocking digital circuits. With a signal range of up to 10V peak to peak and 5V of offset, even old 4000 series CMOS signal levels can be recreated! While this logic family is not in
wide use, it may be useful for testing older circuits.Both the level and offset fields can be
stepped in arbitrary amounts and have a monotonic resolution of 10mV.
Additionally the SG560 contains 6 non-volatile memories which save the full system settings:
frequency, level, shape, and offset. This allows you to frequency hop or use the memories to
“script” repair, testing, and alignment procedures. The SG560 can be run from a broad spectrum of power sources; this allows for portable battery operation if desired, using the proper
precautions.
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±20ppm over its full temperature range.
½ of the value entered. With 0
5
INTRODUCTION
A
DATA
MHz
c
6
f
9
V
kHz
mV
Hz
RCL
STO
B
POWER
123
a
4
d
7
.
b
5
e
8
0
mute
SHIFT
Front Panel Overview
A: The display area.
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The first line: F: for frequency, shape as a two-character icon, and a letter to indicate last recalled or saved memory.
The second line: L: for level in volts peak to peak, O: For offset in volts DC.
B: The power switch.
C: The field selection buttons. Press [FREQ] to go to the frequency field, [LEVEL] to go to the
level field, [OFFSET] to go to the offset field, and [SHAPE] to select shape and return to the last
field selected.
D: Jog dial. Turning this will increment or decrement the currently selected field by the preset
step size. Set the step size before turning.
E: Outputs. These are standard-spaced banana jack outputs for test cables or probes, banana
to BNC adapters, or jumper wire sets.
DATA: This is the data entry keypad. The red portions of the buttons indicate what type of data
is entered during alternate selections. For example, when recalling memories, a-f are active
rather than 1-6. When selecting a shape, 7-9 represent SINE, SQUARE, and TRIANGLE.
Shift mode is activated when the [SHIFT] button is pressed and the SHIFT light is ON.
Do not reproduce or distribute.
SHIFT
C
FREQ
LEVEL
OFFSET
SHAPE
SG560 AUDIO GE NERATOR
D
E
0-5MHZ
TRUE-DC
( )
-
( )
+
6
Property of Ramsey Electronics, Inc.
BASIC USE
Do not reproduce or distribute.
7
BASIC USE
Basic Use
Generating a Frequency:
To enter frequency, press the FREQ key to get into the desired field. A blinking cursor will indicate that the field is selected. Enter the value. For example, for a frequency of 1kHz, press 1,
then kHz. The cursor will return to the start of the field and the knob can be used to increment and decrement the field by the preset step size. To abort an entry, press FREQ, LEVEL,
or OFFSET.
Example: Generate a 2.34MHz signal.
Entering Step Size:
To enter the frequency step (or any other field’s step size) press SHIFT and then the field of
interest, in this case the FREQ button. The field will then display an exclamation (!) character
to indicate that you are in increment entry mode. For a step size of 1kHz, enter 1, kHz.
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Example: Enter a step size of 345.2Hz.
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Once entered, the dial will step the current selected field by this amount. If settings are saved
to memory the step sizes are also saved.To abort an entry, press FREQ, LEVEL, or OFFSET.
Setting Generator Level:
To enter level, press the LEVEL key to go to the Level field. Any voltage in the range of 0-10V
with 10mV of resolution can be entered. This is the peak to peak voltage, not to be confused
with peak or RMS. To convert to peak voltage, just divide the entry by two. To enter a 5.25V
peak to peak signal, enter 5, ., 2, 5, V. Remember that pressing SHIFT, LEVEL will allow entry
of the level step size. To abort, press FREQ, LEVEL, or OFFSET.
Example: Enter a 0.5V peak to peak signal.
Muting the Generator:
Pressing SHIFT, MUTE will mute the output of the SG560. This sets the level to 0.0V and the
offset to 0.0V. Pressing SHIFT, MUTE again will restore the level and offset to the previous
settings.
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