GDS-800
GDS-800 Series Digital Storage Oscilloscope Operation Manual
1
Table of Contents Pages
1. USAGE PRECAUTIONS AND RECOMMENDATIONS..............................2
2. GENERAL DESCRIPTION AND FEATURES.............................................7
3. FIRST TIME OPERATION ..........................................................................9
4. PANEL DESCRIPTION .............................................................................12
5. OPERATION .............................................................................................17
6. BLOCK DIAGRAM....................................................................................68
7. RS-232 CONFIGURATION .......................................................................69
8. SPECIFICATIONS.....................................................................................72
9. EC DECLARATION OF CONFORMITY....................................................82
Due to continuous improvements in the GDS-800 series Digital Storage
Oscilloscope, information contained in this manual is subject to change
without notice. Contact GW, for revisions and corrections.
This document supports firmware version v1.0 for GDS-806S/C and GDS-810S/C; firmware version
v2.03 for GDS-820S/C, GDS-840S/C and previous version
GDS-800 Series Digital Storage Oscilloscope Operation Manual
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1. Usage Precautions and Recommendations
The following precautions are recommended to insure your safety and to provide the
best condition of this instrument. If this equipment is used in a manner not specified
by the manufacture, the protection provided by the equipment may be impaired.
Safety Terms and Symbols
These terms may appear in this manual or on the product:
WARNING: Warning statements identify condition or practices that could
result in injury or loss of life.
CAUTION: Caution statements identify conditions or practices that could
result in damage to this product or other property.
The following symbols may appear in this manual or on the product:
DANGER ATTENTION Protective Frame Earth (ground)
High Voltage refer to
Manual
Conductor
Terminal
or Chassis
Terminal
Terminal
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FOR UNITED KINGDOM ONLY
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
code:
Green/ Yellow: Earth
Blue: Neutral
Brown: Live (Phase)
As the colours of the wires in main leads may not correspond with the colours
marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth terminal
marked with the letter E or by the earth symbol or coloured Green or Green &
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 0.75mm
2
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 & fuse carrier and disposed of immediately, as a plug with
bared wires is hazardous if a engaged in live socket. Any re-wiring must be carried
out in accordance with the information detailed on this lable.
GDS-800 Series Digital Storage Oscilloscope Operation Manual
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Use and Wear
CAUTION
• Do not exceed 300V
peak
into the channel BNC INPUTs.
• To avoid risk of fire hazard and electrical shock, a hazardous live voltage must
never be connected to the negative side (reference side) of the BNC measuring
terminals.
• Do not place any heavy object on the instrument.
• Avoid severe impacts or rough handling that could damage the oscilloscope.
• Use electrostatic discharge precautions while handling and making connections
to the oscilloscope.
• Do not place wires into the connectors of the oscilloscope, only mating connectors
and adapters.
• Do not block or obstruct cooling fan vent opening on side panels or on the rear
panel of unit.
1) Disassembly of the Instrument
• Do not disassemble the instrument; refer the instrument to a factory approved
service facility only.
2) AC Power Input
CAUTION
• AC input should be within the range of selected line voltage ±10%.
• Insure the correct fuse is installed prior to applying voltage for the first time -
100 V ~ 240 VAC input : T 2A / 250V
GDS-800 Series Digital Storage Oscilloscope Operation Manual
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3) Grounding
WARNING
• To avoid electrical shock, the power cord protective grounding conductor must be
connected to earth ground.
4) Fuse Replacement
WARNING
• For continued fire protection, replace the fuse with the specified type and rating only.
• Disconnect power cord before replacing fuse.
• Open cover of AC socket with flat blade screwdriver.
• If the fuse is blown, there is something wrong with the instrument. Repair the
cause of fault before replacing fuse.
• Replace the fuse.
5) Cleaning
• Disconnect AC Power Cord from the instrument before cleaning.
• Use a soft cloth dampened in a solution of mild detergent and water. Do
not spray any liquid into the unit.
• Do not use chemicals or cleaners containing benzene, toluene, xylene, acetone
or other harsh chemicals.
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6) Operating Environment
• The following conditions are recommended for optimum use of the instrument -
Indoor Use Altitude < 2000 m Temperature 0° to 50° C
Relative Humidity < 80% No direct sunlight No strong magnetic fields
Dust Free
• Installation Category: II*
• Pollution degree: 2
7) Storage Environment
• The following conditions are recommended for optimum storage of the instrument
-
Indoor Temperature -20° to 70° C Relative Humidity < 80%
WARNING
This is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
*: Measurement category IV is for measurement performed at the source of low-voltage installation
Measurement category III is for measurement performed in the building installation
Measurement category II is for measurement performed on the circuits directly connected to the
low voltage installation
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2. General Description and Features
The GDS-806/810/820/840 is a useful, 2 channel digital storage oscilloscope with
following features:
z Up to 250MHz (60MHz for GDS-806S/C, 100MHz for GDS-810S/C, 150MHz for
GDS-820S/C and 250MHz for GDS-840S/C series) repetitive bandwidth and
100MSa/s sample rate per channel (25GSa/s E.T. sample rate per channel).
z Up to 10ns peak detection for glitch capture.
z A large 5.7” mono or color LCD display (monochrome display for GDS-806S,
GDS-810S, GDS-820S and GDS-840S, color display for GDS-806C, GDS-810C,
GDS-820C and GDS-840C).
z Two input channels, each with a record length of 125k points and 8 bits vertical
resolution. Both channels acquire waveforms simultaneously.
z Time base: 1ns/div~10s/div.
z 6-digit trigger frequency counter.
z Auto-setting for quick setup and hands-free operation.
z Three Acquisition modes: Sample, peak detect, and average mode.
z Cursors and 15 continuously update, automatic measurements: V
hi
, V
lo
, V
max
,
V
min
, V
pp
, V
average
, V
rms
, V
amp
, rise time, fall time, duty cycle, frequency, period,
positive width, negative width.
z 15 sets memory for front panel setting save & recall.
z 2 sets memory for waveform trace save & recall.
z 100 sets arbitrary waveforms can be input as templates for Go/NoGo function.
z FFT spectrum analysis.
z Two valuable “Program mode” and “Go-No Go” function are included.
z Advanced video and pulse width trigger.
z A large 8 ×12 divisions（menu off）waveform display graticule.
z RS-232, Centronics port, USB output and GPIB interface module are supported.
z Multi-language operating environment are supported, there are English, tradition
Chinese, simplified Chinese, French, German, Italian, Korean, Russian, Finnish,
Spanish and Polish are supported for this moment.
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The advance 32-bit microprocessor controlled GDS-800 series Digital Storage
Oscilloscope has been designed for a wide multitude of applications in service and
industry. For ease of operation the “Autoset” function allows for signal related
automatic setup of measuring parameters. On-screen readout and cursor functions
for voltage, frequency and frequency measurement provide extraordinary operational
convenience. Fifteen different user defined instrument settings can be saved and
recalled without restriction. The built-in RS-232 serial interface allows for remote
controlled operation by a PC. A six digits frequency counter provides extra value for
users. The USB port is able to dump entire scope’s LCD screen to computer via
specific software. The valuable “Program” mode is able to help users to record all the
necessary measuring steps and replay all steps again. The special “Go-No Go”
function is very useful for the people who need to distinguish the pass or failure for
particular conditions.
The instrument offer the right combination of triggering control, frequency response,
and time base versatility to facilitate measurements in a wide range of applications in
laboratory as well as in field service use. It is another example of our dedication to
engineering excellence.
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3. First Time Operation
The following text assumes that the “SAFETY” section of this manual has been read
carefully and understood.
Each time before the instrument is put into operation check that the oscilloscope is
connected to protective earth. For that reason the power cable must be connected to
the oscilloscope and the power outlet. Then the test lead(s) must be connected to the
oscilloscope input(s). Check that the device under test is switched off and connect
the test lead(s) to the test point(s). Then switch on the instrument and afterward the
device under test.
The oscilloscope is switched on by depress the ON/STBY pushbutton (Before
depress the ON/STBY pushbutton of front panel, the main power switch of rear
panel have to be switched on). After a few second the system initiated, the
instrument will revert to its last used operating mode.
Tilt stand this oscilloscope: For desktop use, lock the tilt stand in place as following
figures.
Figure 3-1: Tilts stand this oscilloscope
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Probe compensation
To display an undistorted waveform on an oscilloscope, the probe must be matched
to the individual input impedance of each vertical amplifier.
For this purpose a square wave signal with a very fast rise time and minimum
overshoot should be used, as the sinusoidal contents cover a wide frequency range.
The build-in compensation signal generator provides a square wave signal with a
very fast rise time, and frequency of approx. 1kHz from the output socket below the
LCD screen. As the square wave signals are used for probe compensation
adjustment, neither the frequency accuracy nor the pulse duty factor are of
importance and therefore not specified.
The output provides 2V
pp
±3% for 10:1 probe. When the Y deflection coefficient is set
to 50mV/div, the calibration voltage corresponds to a vertical display of 4 divisions
(10:1 probe).
User checks the waveform indicated correct compensation (see Figure 3-2). If the
waveform indicates over or under compensation, use the alignment tool to adjust the
compensation.
incorrect correct incorrect
Figure 3-2: Probe compensations
For GDS-806S/C and GDS-810S/C only
GDS-806 and GDS-810 series provides a valuable “adjustable probe compensation
signal function”. The range for adjustable probe compensation signal is adjusted from
1kHz to 100kHz, 1kHz per step; and duty cycle is adjusted from 5% to 95%, 5% per
step. This function can satisfy user with the probe compensation easily and accurate.
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AUTOSET
The “Autoset” function provides a stable, triggered display of any input signal (almost).
User can connect a signal to either the channel 1 or channel 2 input BNC connectors
and press AUTOSET button. Table 3-1 shows the defaults of “Autoset” function
Table 3-1: Defaults of “Autoset” function
Control Modified by Autoset
Acquire Sample
Acquire stop after RUN/STOP button only
Display style Vectors
Display format YT
Horizontal position Centered within the graticule windows
Horizontal Scale As determined by the signal frequency
Trigger coupling DC
Trigger level Midpoint of data for the trigger source
Trigger position Center
Trigger slope Positive
Trigger source Highest frequency if both channel available
Trigger type Edge
Vertical bandwidth Full
Vertical coupling DC or AC (depend on the signal)
Vertical offset 0 V
Vertical scale As determined by the signal level
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4. Panel Description
Front Panel
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Display Area
(1): The memory bar (500 point processed by oscilloscope)*.
(2): Trigger position (T) indicator
(3): Viewable area shows segment of memory bar which been displayed*. Please
refer page 40 for details.
(4): Run/Stop mode indicator
(5): Trigger status
(6): Trigger level indicator
(7): Channel position indicator
(8): Delay trigger indicator
(9): Status display for channel 1 & 2
(10): Sample rate status readout
(11): Horizontal status readout
(12): Trigger source and status readout
(13): Trigger type and mode readout
(14): Acquisition status
(15): Interface type indicator
(16): Trigger Frequency counter
*: The memory bar is always 500 points under RUN mode even the memory
length is selected over 500 points, the oscilloscope is still displaying 250points
or 300points (menu off) on LCD screen waveform area.
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Vertical controls
(1): Channel 1, 2 POSITION knobs. The position control knobs adjust the vertical
position of the channel 1 and channel 2 waveforms
(2): CH1, CH2 Menu pushbutton. Shows the vertical waveform function and
waveform display on/off
(3): MATH function pushbutton. Selects the different math function
(4): VOLTS/DIV knobs. Adjusts the vertical scale of the waveforms.
Horizontal controls
(1): HORI MENU. Select the horizontal functions
(2): Horizontal POSITION knob. Adjust waveforms horizontal position
(3):
TIME/DIV knob. Adjusts the horizontal scale of selected waveform
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Trigger controls
(1): The power ON/STANDBY pushbutton
(2): Selects the trigger type, source and mode
(3): Adjust the trigger level
Miscellaneous controls
(1): Select the acquire modes
(2): Control the display modes
(3): Select the utility functions
(4): Sets the Program mode
(5): Select the cursor types
(6): VARIABLE knob. Multi-function knob which controls many menu functions
(7): Access the 15 automatic measurements.
(8): AUTOSET pushbutton automatically adjusts setup values to track a signal
(9): Printout a hardcopy of the LCD display.
(10): Start and stop oscilloscope acquisition.
(11): Save and recall the setups and waveforms
(12): Erases the stationary waveforms display
(13): Display build-in help files on the LCD screen
(14): Stop the replay for Program mode
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BNC inputs
(1): The channel 1 & 2 BNC inputs receive electrical signals for display
(2): Ground
(3): Connects with a external trigger signal to oscilloscope
Rear Panel
(1): Main power switch
(2): AC power socket
(3): GPIB port (option)
(4): Fuse drawer
(5): “SELF CAL” output BNC ((DC output :0~±2V).
(6): “GO/NO GO” output BNC (A 10us pulse will generated, 5V Maximum/10mA TTL
output. Please refer to page 46 for details)
(7): USB connector
(8): Printer port
(9): RS-232 port
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5. Operation
This chapter contains useful information about the operation of this oscilloscope.
Vertical Control
All vertical operations affect the selected waveform. Press the CH1, CH2, or MATH
pushbutton to adjust and select the waveform scale and position.
Figure 5-1: The vertical controls panel
VOLTS/DIV: The VOLTS/DIV knobs adjust the vertical scale (in a 1-2-5 sequence) of
the selected waveforms (channel 1 and channel 2).
POSITION: The position control knobs adjust the vertical position of the channel 1 &
2 waveforms. When the vertical position is adjusted, the channel position indicator
or (located on the left side of the LCD graticule) will change the position
simultaneously. Besides, the vertical position reached to the vertical border of LCD
graticule, the channel position indicator will change the shape to the “ , ” or “ , ”.
The information of vertical scale will also display on the LCD screen.
(1): If position of channel1 (or channel2) changed, the vertical position readout will be
displayed on here
Figure 5-2: Operating the position knob
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CH1, CH2: The vertical menu contains the following items when channel 1 or channel
2 is the selected. These two pushbuttons are also switching the waveform display of
channel 1/channel 2 on or off. If channel one (or channel 2) turned off, the light of
CH1 (or CH2) LED button will be off, and vice versa.
z Coupling / / : Press F1 softkey to select AC ( ),
DC ( ) coupling, or ground ( ).
z Invert On/Off: Press F2 softkey to select to turn (waveform) invert on or off
z Bw Limit On/Off: Press F3 softkey to switch between 20MHz or full bandwidth.
z Probe 1/10/100: Press F4 softkey to select the probe’s ×1, ×10, or ×100
attenuation.
z Impedance 1MΩ: Input impedance display. Always 1MΩ input impedance for
GDS-800 series digital storage oscilloscope.
MATH: Select a formula from the math menu: CH1+CH2, CH1-CH2 or FFT (Fast
Fourier Transform). You can convert a time-domain signal into its frequency
components by our advanced FFT math function. The Math menu contains the
following items by pressing F1 softkey after math function is selected. The display of
mathematical waveform can be disabled by pressing MATH pushbutton again.
z CH1+CH2: Waveform of channel 1 plus waveform of channel 2.
Figure 5-3: Operating the math function (Channel + channel 2)
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z CH1-CH2: Waveform of channel 1 minus waveform of channel 2.
The position of CH1+CH2/CH1-CH2 mathematical waveform can be adjusted by
rotating the VARIABLE knob. The math position indicator (located on the left
side of the LCD graticule) will change the position simultaneously. The
information of mathematical division and unit will also display on the math menu
bar.
z FFT: The details of FFT operations are following:
FFT
Operation: Push the MATH button to select the FFT function. The Source Channel
and Window algorithm can be selected. Press MATH pushbutton again to disable
FFT spectrum display.
z Source CH1/CH2: Selects the channel which assigned as the FFT spectrum.
z Window Rectangular/Blackman/Hanning/Flattop:
z Window Rectangular: Transform to rectangular windowing mode. This
windowing mode is suitable for transient analysis.
z Window Blackman: Transform to Blackman windowing mode. The peak
resolution of Blackman windowing is not as fine as Hanning windowing,
however, the response shape flares out less at low levels and rejection of
sidelobes is better.
z Window Hanning: Transform to Hanning windowing mode. User can
acquire higher frequency resolution by using this windowing mode.
z Window Flattop: Transform to flattop windowing mode. This mode can
obtain higher magnitude accuracy.
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z Position: Adjusts the FFT position on the display area by rotating the
VARIABLE knob. The “ ” math position indicator which located on the left side
of LCD screen is always pointed to 0 dB approximately, where 0dB is defined as
1Vrms.
z Unit/div 20/10/5/2/1 dB: Press F5 softkey to expand the FFT spectrum vertically.
Expand factors are 20dB/Div, 10dB/Div, 5dB/Div, 2dB/Div and 1dB/Div.
FFT spectrum measurement by using cursors: FFT spectrum’s magnitude (dB)
and frequency (Hz) can be measured by using cursors. Press CURSOR pushbutton
and select Source MATH by pressing F1 softkey.
z Source MATH: Selects FFT spectrum cursors measuring function.
z Horizontal / / / : Adjust vertical cursors by
rotating the VARIABLE knob. The reference values are also shown on the LCD
screen:
f1: first cursor frequency indication
f2: second cursor frequency indication
△ : The difference value of f1 and f2
Div: frequency per division at present
For more detail operations, please refer to page 59.
z Vertical / / / : Adjust horizontal cursors by
rotating the
VARIABLE knob. The reference values are also shown on the LCD
screen: The color of two horizontal cursors will be changed to red for the color
oscilloscope.
M1: magnitude indication of first cursor
M2: magnitude indication of second cursor
△ : The difference value of M1 and M2
For more detail operations, please refer to page 60.
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(1): Cursors measure frequency of input waveform.
(2): The spectrum of channel one input waveform.
(3): Cursors measure magnitude of input waveform.
(4): the readouts for both horizontal and vertical cursors.
Figure 5-4: Operating the math function (FFT) with cursors measurement
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Horizontal Control
To select the horizontal controls, press the MENU pushbutton to select the features.
Figure 5-5: The horizontal controls panel
TIME/DIV: The TIME/DIV knob adjusts the horizontal scale (in a 1-2-5 sequence) of
the selected waveforms (channel 1 and channel 2).
POSITION: The position control knobs adjust the horizontal position of the channel 1
& 2 waveforms. When the horizontal position is adjusted, the trigger position (T)
indicator “▼” (located on the upper side of the LCD graticule) will change the position
simultaneously. Besides, the horizontal position reached to the horizontal border of
the LCD graticule, the trigger position (T) indicator “▼” will change the shape to the
“τ” or “υ”.
MENU: Select a control to modify the timebase, horizontal position, and horizontal
magnification of selected waveform.
z Main: Display the main timebase only.
z Window: To switch between the normal and zoomed display, Press F2 softkey
to display the timebase of windows zoom, in the meantime, the waveform
display area will change to gray color except the zoomed area (see figure 6-6).
Use the
TIME/DIV knob to change the length (windows frame time range: from
2ns to one more step faster than the desired timebase. For example, if the 1ms
timebase is selected, the maximum window frame timebase will be 500µs) of the
zone and rotates the horizontal’s POSITION knob to change the position.
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z Window Zoom: Press F3 softkey to display the zoomed waveform.
Figure 5-6: Operating the zoom function
z Roll: Press the F4 softkey to obtain a rolling display similar to a strip-chart
recorder. In the meantime, the system will select the roll mode from “Acquisition
Mode” and the timebase of 200ms/div upper limited automatically.
z XY: Select XY display format if user want to show channel 1 in horizontal axis
and channel 2 in vertical axis. The XY display controls as following:
The channel 1 ◎ VOLTS/DIV knob and vertical POSITION knob controls the
horizontal scale and position.
The channel 2 ◎ VOLTS/DIV knob and vertical POSITION knob controls the
vertical scale and position.
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Figure 5-7: Operating the XY display function
These 500 points processed by the oscilloscope under run mode are characteristic
points of real acquired long memory waveform. Due to the hardware limitation of LCD
panel, always 250 points (300 points for side menu off) will be displayed. The way to
explore the real acquired waveform on the oscilloscope’s long memory is stopping
the scope and change the time base. When the scope is stopped, users can observe
any portion or all the waveform memory record by changing the time base or
horizontal trigger position. Decreasing time base expands the waveform and is
referred to as “zooming in”. This feature performs the similar function to the time base
windowing feature. But this feature is available under the real-time acquisition mode
and is only operable when acquisition is stopped.
Users can shift the stopped waveform horizontally on the LCD screen. It is controlled
by the horizontal’s
POSITION knob. Increasing “delay trigger indicator” shifts the
waveform to the left and decreasing “delay trigger indicator” shifts the waveform to
the right. By observing the memory bar and viewable area, user can see what portion
of the memory is being displayed.
The memory length is also an important factor because the following formula.
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For example, a signal is display on the screen as figure 5-8.
Figure 5-8: The stopped waveform
The sample rate is 250kS/s and the record length is 2500, according the formula we
have
There are 10ms of data in the waveform record. Users may change the “delay trigger
indicator” to observe the total waveform record.
Figure 5-9: Increasing “delay trigger indicator” shifts the waveform to the left
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