User manual

Logic Analyzer Option
DS2-8LA and DS2-16A
QUICK START GUIDE
GW INSTEK PART NO. 82DS-23043M01
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is
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 DS2-8LA and the DS2-16LA Logic Analyzer
options allow the GDS-2000A to be upgraded to a
powerful mixed signal oscilloscope. These options
include both parallel and serial bus (UART, SPI, I
2
C)
triggering and decoding as well as powerful logic
triggering.
The Logic Analyzer options also take advantage of the
GDS-2000’s segmented memory, search, automatic
measurements, cursor functionality and the exceptional
2M record length.
Main Features
Option Channels Bandwidth
DS2-16LA 16 200MHz
DS2-8LA 8 200MHz
Features
• 500MSa/s sample rate.
• 200MHz bandwidth.
• Parallel bus triggering.
• Serial bus triggering (UART, SPI,
1
2
C).
• 2M record length.
Logic Analyzer
Software
Features
• Group channels.
• Custom threshold levels for each
group of digital channels.
• Analog waveform function.
• Labels.
Package Contents and Accessories
Standard Accessories for DS2-8LA
Item Part Number
8-Channel Logic Analyzer Probe
GTL-08LA
8-Channel Logic Analyzer Card
GLA-08
Standard Accessories for DS2-16LA
Item Part Number
16-Channel Logic Analyzer Probe
GTL-16LA
16-Channel Logic Analyzer Card
GLA-16
Display Overview
Logic Analyzer Display Overview
6
24
5
1
3
Description
1. Horizontal Position 2. Trigger Status
3. Horizontal Status 4. Bottom Menu
5. Digital Channel/Bus
Indicators
6. Analog Waveform
Indicator
Bus Display Overview
9
57
8
4
6
1 2 3
Description
1. Bus Data 2. Start Bit
3. Stop Bit 4. Horizontal Position
5. Trigger Status 6. Horizontal Status
7. Bottom Menu 8. Digital Channel
Indicators
9. Bus Indicator
Setting up the Oscilloscope
This section describes how to set up the oscilloscope
properly including installing the logic analyzer cards,
using the logic analyzer probes and how to access the
functions that are included with the logic analyzer
option.
Installing Logic Analyzer Cards
The logic analyzer modules need to be installed into
the module slots on the rear panel.
Do not insert or remove the modules with the power
on.
1. Slide the tabs holding the
module cover to the unlock
position and then remove.
2. Install the optional module. Be sure to make sure
that the groves on the module line-up to the slots
in the module bay.
3. Slide the locking mechanisms back to the locked
position.
4. Turn on the GDS-2000A.
5. The GDS-2000A is now ready to operate
Using the Logic Analyzer Probes
This section will describe how to connect the digital
channels to the device under test. To use the digital
channels the optional logic analyzer module must be
installed.
1. Turn the DUT off to protect it from being short
circuited when the probes are attached.
2. Insert the Logic Analyzer
probe into the Logic
Analyzer input.
3. Connect the ground lead (black) from the logic
analyzer probe to the circuit ground on the DUT.
GND
4. Connect another probe lead to a point of interest
on the circuit. Make note of which probe lead is
connected to which point.
5. Repeat step 4 with any remaining probes.
GND
Signal 1
Signal 2
. . .
Accessing the Logic Analyzer Menu
The Logic Analyzer menu can be accessed using the
Option key.
1. Press the

key and select Logic Analyzer to
access the Logic Analyzer menu.
2. Press the D15~D0 On/Off soft-key to activate the
digital channels.
 The position of each channel can be set in
this menu.

Channels can be grouped in this menu.
3. Press Thresholds to set the thresholds.
 Thresholds can be individually set for every
4 digital channels. I.e., D0~D3, D4~D7 and
so on.
 There are 5 pre-set threshold levels in
addition to the User-defined threshold
setting (TTL, 5.0V CMOS, 3.3V CMOS,
2.5V CMOS, ECL, PECL, 0V).
4. Press Analog Waveform to display an analog
waveform of the digital channels.
 Analog waveforms can be created from
either the D0~D7 or D8~D15 digital
channels.
 Only one analog waveform can be displayed
at a time.
5. Press the Height soft-key to toggle the scale of the
digital channels.
Using the Bus Key
The Bus key configures the UART, SPI, I
2
C or Parallel
buses.
1. Press the


key to access the Bus menu and
to display the bus on the display.
 Only those digital channels that have been
activated from the Logic Analyzer menu will
be accessible from the Bus menu.
 Pressing the Bus key again will remove the
bus from the display.
U
ART Bus
The UART bus menu is designed to decode RS-232 and
other common RS-232 variants such as RS-422 and RS-
485.
1. Press the Bus soft-key and select UART.
2. Press Define Inputs to select the Tx and Rx inputs
as well as the signal polarity.
3. Press Thresholds to set the thresholds.
 There are 5 pre-set threshold levels in
addition to the User-defined threshold
setting (TTL, 5.0V CMOS, 3.3V CMOS,
2.5V CMOS, ECL, PECL, 0V).
4. Press the Configure to set the baud rate, data bits,
parity and packet settings.
5. Press Bus Display to configure how the data is
displayed, either hex or binary.