Teledyne LeCroy MS-250 User manual

Operator's
Manual

MS-250 Mixed Signal
Oscilloscope Option

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option Operator's Manual

© 2017 Teledyne LeCroy, Inc. All rights reserved.

Unauthorized duplication of Teledyne LeCroy documentation materials
other than for internal sales and distribution purposes is strictly
prohibited. However, clients are encouraged to duplicate and distribute
Teledyne LeCroy documentation for their own internal educational
purposes.

MS-250 and Teledyne LeCroy are trademarks of Teledyne LeCroy, Inc.
Other product or brand names are trademarks or requested trademarks of
their respective holders. Information in this publication supersedes all
earlier versions. Specifications are subject to change without notice.

928335-00 Rev A3
April, 2017

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Contents

Introduction ....................................................................................................... 1

Technical Overview ..................................................................................................... 2

Standard Hardware ..................................................................................................... 3

Accessories ................................................................................................................. 5

Connecting the Mixed Signal Device .................................................................. 7

Connecting to the Oscilloscope ................................................................................. 7

Digital Connections ................................................................................................... 10

Digital Setup .................................................................................................... 11

Digital Logic Setup .................................................................................................... 11

Digital Group Setup ................................................................................................... 13

Displaying Digital Traces .......................................................................................... 14

Renaming Digital Lines ............................................................................................. 15

Digital Triggering ............................................................................................. 16

Setting Up Digital Triggers ....................................................................................... 16

Pattern Trigger .......................................................................................................... 17

Edge Trigger .............................................................................................................. 20

Width Trigger ............................................................................................................. 21

Glitch Trigger ............................................................................................................. 22

Interval Trigger .......................................................................................................... 23

Dropout Trigger ......................................................................................................... 24

Qualified Trigger ........................................................................................................ 25

Reference ........................................................................................................ 26

Returning a Product for Service ............................................................................... 26

Technical Support ..................................................................................................... 27

i

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Welcome

Thank you for purchasing a Teledyne LeCroy MS-250 Mixed Signal
Oscilloscope Option.

The MS-250 is a powerful solution for the challenge of measuring multiple,
mixed signals in a single oscilloscope. An enhancement to the Teledyne
LeCroy oscilloscopes, the MS-250 extends their testing range by adding
18 digital channels for display or triggering.

This MS-250 manual assumes that you have a basic understanding of
discrete electronics, logic analyzers, and Teledyne LeCroy oscilloscopes,
specifically the model you will use with the MS-250. When necessary,
details on specific oscilloscope features are included in this manual.

Contact your nearest Teledyne LeCroy customer service center or national
distributor if anything is missing or damaged. We can only be responsible
for replacement if you contact us immediately.

Sincerely,

David C. Graef

Vice President and Chief Technology Officer

ii

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Introduction

The MS-250 Mixed Signal Oscilloscope Option is a complete system that
adds digital acquisition and triggering capabilities to a Teledyne LeCroy
oscilloscope.

Once properly connected to the oscilloscope and the device under test,
you will be able to use the oscilloscope user interface for the following:

• Digital Logic Control: Set the logic threshold and hysteresis for each
lead bank, choosing from standard logic families or entering a custom
setting.

• Digital Group Management: Combine individual digital lines into bus
groups to be managed together. Give lines descriptive logical names,
regardless of the physical lead number.

• Digital Analysis: Display digital signals as single line traces or
collapsed bus traces. Many of the same tools available for analyzing
analog signals may be applied to digital signals.

• Digital and Combined Triggering: Choose to set an acquisition trigger
on a digital signal pattern or a combination of conditions using both
analog and digital signals.

The MS-250 is ideally suited for embedded controller testing where there
is a proliferation of analog signals coincident with digital signals. You can
easily debug signals using standard oscilloscope tools such as cursors,
measurement parameters, and zooming. Oscilloscopes compatible with
the MS-250 feature large, bright color displays to facilitate signal viewing,
plus all the connectivity and documentation capabilities needed to quickly
record and distribute information.

1

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Technical Overview

The MS-250 is an external device that digitally samples waveform data at
up to 1 GS/s (for 250 MHz digital signals). Unlike a logic analyzer, it
operates only in a Timing Analysis mode, so it requires 4x oversampling to
determine the correct digital edge position, and does not require the user
to input a clock.

While in SINGLE, NORMAL, or AUTO trigger mode, the MS-250 repeatedly
samples each digital channel’s voltage level. If the voltage is greater than
the threshold voltage, the MS-250 stores a 1 in internal memory.
Otherwise, a 0 is stored.

The minimum high voltage level may be defined by the user (using the
hysteresis controls) up to 1.4 V above the threshold. The maximum low
voltage level may be defined to 1.4 V below the threshold. The minimum
signal swing is 100 mV. The indeterminate range of 50 mV around the
threshold voltage level is the level below which the MS-250 will not
operate. However, the MS-250 can support a signal as low as 100 mV only
if the input signal’s quality is adequate.

The MS-250 keeps sampling its inputs until the oscilloscope is put into
STOP trigger mode. Data is stored in a 50 Mpt internal memory that is
periodically transferred to the oscilloscope via the USB2.0 cable. If the
oscilloscope is triggering in SINGLE or NORMAL trigger mode, data is
acquired and transferred only when the trigger condition is satisfied. The
captured data is displayed on the oscilloscope in a time-aligned fashion.

2

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

QTY

MS-250

Mixed Signal

Provides 18-channel digital acquisition and

1

16" Digital

Interfaces the MS-250 to the device under test.

1

In any trigger mode (AUTO, NORMAL, SINGLE), pressing STOP trigger
cancels the acquisition, which leaves the previously acquired data
unchanged.

The USB2.0 cable provides downloading of trigger conditions from the
oscilloscope to the MS-250 and uploading of digital data from the MS-250
to the oscilloscope.

Standard Hardware

The MS-250 is delivered with the following hardware:

Part Description

Accessory

Leadset

triggering.

The lead set terminates in a 25 mil pin socket.
Micro-gripper probes of various sizes are available
as accessories from Teledyne LeCroy, and may be
connected to the lead set. The lead set is divided
into two banks. Each lead within the bank is color­coded (to resistor color-coding standard) and has
an individual ground connection. In addition, there
are two common ground leads available for use.

3

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

QTY

MS-250

Bus Cable

1.3m cable to connect Mixed Signal Accessory to

1

3" Flexible

Lead for grounding individual digital inputs

5

Ground

Connect to ground port of any digital input and

20

Carrying
Case

1

Operator's
Manual

1

Part Description

the main oscilloscope unit, includes USB2.0 cable.
This connection provides timebase
synchronization, cross-triggering and power.

Ground Lead

Extender

make a simple signal and ground connection to a

0.1” square pin header.

4

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Accessory

Part Number

Description

Digital Leadset

MSO-DLS-18

Additional 16" leadset for inputting lines

wish to disconnect/reconnect leads.

Large Gripper

PK400-1

Large gripper probe set for 0.10 inch

Medium Gripper

PK400-2

Medium gripper probe set for 0.04 inch

Accessories

You may purchase these optional accessories separately:

D0-D17. This can be useful if you have
more than one device under test and don't

Probe Set

Probe Set

(2.54 mm) pin pitch. Includes 10 probes with
color-coded leads.

(1.00 mm) pin pitch. Includes 10 probes with
color-coded leads.

5

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Accessory

Part Number

Description

Small Gripper

PK400-3

Small gripper probe set for 0.008 inch

Mictor Cable

MSO-MICTOR

Mictor Connection cable, 16" (40.64 cm),
36 channel connector

Interconnect

MSO-3M

Interconnect cable, 16" (40.64 cm), mates

2520-5002.

Probe Set

Cable

(0.2 mm) pin pitch. Includes 10 probes with
color-coded leads.

with 3M connectors 2520-6002 and

6

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Connecting the Mixed Signal Device

Connecting to the Oscilloscope

To connect the Mixed Signal accessory to your oscilloscope:

1. Connect the Bus Cable to the LBUS connector on the oscilloscope. Be
sure the head is turned so that the positioning wedge fits into the
groove at the top of the connector. Fasten the thumb screws.

2. Connect the USB 2.0 cable (attached to the Bus Cable) to any of the
USB ports on the oscilloscope.

7

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

3. Connect the other end of the Bus Cable to the MS-250. Again, be sure
to align the wedge and the groove. Fasten the thumb screws.

4. Connect the other end of the USB 2.0 Cable to the MS-250.

8

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

5. Connect the Digital Leadset to the Digital Inputs D0 – D17 connector
on the opposite end of the MS-250 and fasten the thumb screws.

NOTE: Each digital line has a ground connection for optimal
performance. Two additional ground leads common to the whole
leadset are also available.

9

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Digital Connections

Connect the Digital Leads to the digital lines you wish to observe (using
accessory micro-grippers, if desired).

Digital Banks

Each 18-channel lead set is divided into two physical banks of 9 leads,
and each bank is bundled with a plastic separator.

Each lead bank (D0-D7, D8-D15, etc.) will share the same Logic Family (or
custom logic Threshold), regardless of how the individual lines are
assigned to digital bus groups.

Connector Colors

The leads in each bank use 9 repeating colors. The color sequence
corresponds to the resistor color code, making it easier to know the digital
line number without having to look at the label.

Standard Output Connection

The standard terminations on the digital leadset can be pushed directly
onto 25-mil pins. MicroGrippers or NanoGrippers may also be used to
probe the test circuit’s pins. Teledyne LeCroy provides a selection of
small, medium, and large grippers for various pitch sizes. A more
complete selection of adapter probes is available for most chips from
Emulation Technology Inc., Yamaichi Inc., and other manufacturers.

10

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Digital Setup

Digital Logic Setup

Each lead bank requires a Logic Setup to determine the assignment of a 1
or 0, depending on the measured voltage relative to the Threshold.

Threshold Level

The threshold level determines how the input signal is interpreted. Input
voltages less than the threshold are converted to 0, while input voltages
greater than the threshold are converted to 1.

To set Threshold:

1. Go to Vertical > Digital 1 Setup to Display the Digital Setup dialog.
Open the Logic Setup tab.

2. For each available lead bank, Touch Logic Family and either chose
one of the standard families or User Defined.

TTL circuits use a threshold voltage level of 1.58 V. ECL circuits use a
threshold voltage level of -1.39 V.

3. If you chose User Defined, enter a custom Threshold and Hysteresis.

Custom threshold levels can be set between –10.0 V and +10.0 V.

11

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Minimum Voltage Swing (Hysteresis)

You can define the minimum high voltage and maximum low voltage
levels using the Hysteresis controls.

• Minimum high voltage may be set up to 1.4 V above the threshold.

• Maximum low voltage may be set up to 1.4 V below the threshold.

The minimum signal swing is 100 mV. The indeterminate range of 50 mV
around the threshold voltage level is the level below which the MS-250 will
not operate. However, the MS-250 can support a signal as low as 100 mV
only if the input signal’s quality is adequate.

12

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Digital Group Setup

This procedure organizes the digital lines into groups, which correspond
to buses. The lines within a single group can be displayed individually, or
collapsed into a Bus trace.

You can set up a total of two, distinct groups: Digital1 and Digital2. Each
group is designated by its own Digital setup dialog.

Any lines from any lead bank can be combined into a single group, and
individual lines can be assigned to as many groups as you wish.

NOTE: While lines can be combined in any way, each lead bank can only
have a single logic setup, so be aware of that when choosing lines.

1. Go to Vertical > Digital 1 Setup to Display the Digital Setup dialog.

2. Open the dialog for the group you wish to configure (e.g., Digital1).

3. Check the box for each line to be added to the group. If a line is in a
bank other than the one displayed, touch the left or right arrow
buttons until that bank is shown on the dialog.

TIP: Use the All Lines Off and All Lines On buttons to quickly
deselect/select lines.

NOTE: Along the bottom of the dialog is an indicator for each line in all the
lead banks. As you add lines to the group, the indicator is checked, so you
can always see all the lines currently in the group. You can also use these
checkboxes to select lines.

13

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Displaying Digital Traces

The Trace On checkbox is selected by default, so if you are connected to a
live input, you should see digital traces appear as you add lines to the
group.

To turn off the trace display, clear Trace On.

CAUTION. Do not use the All Lines Off or All Lines On buttons to
control the display. Doing so will erase your digital group set up.
Use the Trace On checkbox to show or hide the traces.

Position Traces

In Position, enter the number of divisions (positive or negative) relative to
the zero line of the grid where the display begins. The top of the first trace
appears at this position.

In Line Height, enter the total number of grid divisions each line should
occupy. The selected traces (Line or Bus) will appear in this much space.

Individual traces are resized to fit the total number of divisions available.
In the example below, each trace takes up one division.

To move the entire group of traces to another grid, touch the Next Grid
button at the bottom right of the dialog.

NOTE: This button will only appear if your oscilloscope has this capability.

Change Trace Style

When Trace On is enabled, digital Line traces show the state of each line
relative to the threshold. You can also view a digital Bus trace that
collapses all the lines in a group into their Hex values. At the far right of
the dialog, choose to either:

• Expand the group into individual line traces. The size and placement
of the lines depend on the number of lines, the Vertical Position and
Line Height settings.

• Collapse the group into a single bus trace.

14

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Digital line traces 1 division high starting at position 4 (top of grid).

Digital bus trace 1 division high starting at position 4.

Store Display

To store the entire group and display setup to an internal memory, touch
the Store button at the far right of the dialog. You can recall this setup to
the grid in the future by choosing Math > Memory Setup and selecting
Trace On for the respective memory.

Renaming Digital Lines

You can give each line a user-defined name to make the interface more
intuitive.

1. Touch the Dx button immediately below the Dx selection checkbox
(the words "Change Line Name" appear at the far left of the row).

2. Use the virtual keyboard that appears on the touch screen to enter a
new name. When finished, click OK.

The new line name now appears on the Dx button, instead of the
original line number. The number remains over the checkbox.

NOTE: The number of letters that appear will depend on the resolution of
your oscilloscope display. Keep names short so lines are easily
identifiable.

15

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Digital Triggering

Setting Up Digital Triggers

To access the Trigger setup dialogs, do one of the following:

• Choose Trigger > Trigger Setup from the menu bar

• Press the front panel Trigger Setup button

• Touch the Trigger descriptor box

The main Trigger dialog contains the trigger type selections.

Other controls will appear depending on the trigger type selection (e.g.,
Slope for Edge triggers). These are described in the set up procedures for
each trigger.

The trigger condition is summarized in a preview window at the far right of
the Trigger dialog. Refer to this to confirm your selections are producing
the trigger you want.

16

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Pattern Trigger

Pattern is the default trigger when the Mixed Signal option is connected to
the oscilloscope, as these users generally wish to find and trigger upon
digital logic patterns.

However, a Pattern trigger can also be set on a user-defined pattern of
High or Low voltage levels in analog channels (including the External
Trigger input), or a combination of digital and analog patterns when Mixed
Signal capabilities are available.

On the Trigger dialog, select Pattern trigger type. Open the Digital Pattern
dialog to display the controls.

Digital Pattern

The Logic Bus method simplifies pattern set up by utilizing digital groups
and logic you have already defined on the Digital Setup dialogs. A digital
pattern is set on a single bus (group) manually or by applying a
hexadecimal value, while the remaining lines are disabled ("Don't Care").

If you have not set up digital groups, you can set a digital pattern line by
line using the Logic method. All available lines remain active for selection.

1. Open the Digital Pattern dialog.

2. At the far right of the dialog, choose either Logic Bus or Logic.

3. Optionally, deselect Filter Out Unstable Conditions. This default filter
ignores short glitches in logic state triggers that last less than 3.5 ns.

4. If using Logic Bus, touch Source and select the digital group. Any
lines that are not in this group will now be disabled.

17

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

5. To apply a digital logic pattern, either:

• Enter the hexadecimal value of the pattern (in Hex or Value).
Lines will take a logical 1, 0, or X ("Don't Care") according to the
pattern. Disabled lines will remain X.

• Touch the Dx button for each active line, and select whether it
must be High or Low compared to the logic threshold. Depending
on your selection, a logical 1 (High) or 0 (Low) now appears on
the dialog. Leave X selected for any line you wish to exclude from
the pattern. Use the Left and Right Arrow buttons to display lines
in other digital banks.

NOTE: As an alternative to a digital logic pattern, you may set edge
conditions on any line. Touch the Dx button and choose the edge.
Edge conditions always assume a logical OR in the overall trigger
criteria.

TIP: As you work, the checkboxes along the bottom of the dialog will
change to show the pattern. You can also use these checkboxes to
make selections.

6. If you have not already set a logic threshold, open the Levels dialog
and select a Logic Family for each digital bank from which you've
selected lines. To set a custom logic threshold, choose Logic Family
User Defined, then enter the Threshold voltage and Hysteresis.

NOTE: Digital lines inherit the Logic Setup made when defining digital
groups. However, you can change the logic threshold on the Levels
dialog, as well. The two settings are linked; they will always reflect
whatever was last selected on either dialog. Logic thresholds can only
be set per lead bank, not individual line.

18

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Analog Pattern

1. To add the analog pattern to the digital pattern, leave your digital
pattern as is and skip to step 2.

To create an analog-only pattern, touch Set All To... and select Don't
Care. This will eliminate any meaningful digital pattern and activate all
the Boolean operators.

2. Touch the Left Arrow button until the C1-EXT group of inputs is
displayed in the main section of the dialog.

3. Touch the Cx button for each input to be included in the pattern, and
select whether it must be High or Low compared to the threshold
Level you will set.

Depending on your selection, a logical 1 (High) or 0 (Low) now
appears on the dialog. Leave Don't Care ("X") selected for any input
you wish to exclude.

4. Select the Boolean operator (AND, NAND, OR, or NOR) that describes
the relationship among inputs (e.g., C1 must be High AND C2 must be
Low).

NOTE: Only the AND operator is available when combining analog and
digital patterns. In the example above, all digital lines have been set to
Don't Care ("X"), so all operators are available.

5. Open the Levels dialog and enter the voltage threshold for each input
included in the trigger.

6. If you've included EXT as an input, open the Ext dialog and enter the
Attenuation.

19

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Edge Trigger

Edge triggers upon a achieving a certain voltage level in the positive or
negative slope of the waveform. It is the default trigger selection on
standard oscilloscopes.

On the Trigger dialog, select Edge trigger type to display the controls.

1. Choose the Source digital line.

2. Choose the Slope (edge) upon which to trigger.

3. Choose the Logic Family that marks the High-Low logic threshold. To
enter a custom threshold, choose Logic Family User Defined and
enter the voltage Level.

NOTE: The Logic Family will default to any Logic Setup associated
with that line in a previous digital group setup.

20

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Width Trigger

Width triggers upon finding a positive- or negative-going pulse width when
measured at the specified voltage level.

On the Trigger dialog, select Width trigger type to display the controls.

1. Choose the Source input line.

2. Choose the line Polarity on which to trigger.

3. Choose the Logic Family that marks the High-Low logic threshold. To
enter a custom threshold, choose Logic Family User Defined and
enter the voltage Level.

NOTE: The Logic Family will default to any Logic Setup associated
with that line in a previous digital group setup.

4. Use Width Condition is settings to create an expression describing
the triggering pulse width. This may be:

• Any width Less Than an Upper Value.

• Any width Greater Than a Lower Value.

• Any width In Range or Out Range of values. You may describe the

range using either:

• Limits, an absolute Upper Value and Lower Value.

• Delta, any Nominal width plus or minus a Delta width.

21

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Glitch Trigger

Glitch triggers upon finding a fixed pulse-width time or time range.

On the Trigger dialog, select Smart trigger type, then Glitch to display the
controls.

1. Choose the Source input line.

2. Choose the Polarity on which to trigger.

3. Choose the Logic Family that marks the High-Low logic threshold. To
enter a custom threshold, choose Logic Family User Defined and
enter the voltage Level.

NOTE: The Logic Family will default to any Logic Setup associated
with that line in a previous digital group setup.

4. Use Glitch Condition is settings to create an expression describing
the glitch width. This may be:

• Any width Less Than an Upper Value.

• Any width In Range of values marked by the specified Upper

Value and Lower Value.

22

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Interval Trigger

Interval triggers upon finding a specific interval, the time (period) between
two consecutive edges of the same polarity: positive to positive or
negative to negative. Use the interval trigger to capture intervals that fall
short of, or exceed, a specified range.

On the Trigger dialog, select Smart trigger type, then Interval to display the
controls.

1. Choose the Source input line.

2. Choose the Slope (edge) from which to measure.

3. Choose the Logic Family that marks the High-Low logic threshold. To
enter a custom threshold, choose Logic Family User Defined and
enter the voltage Level.

NOTE: The Logic Family will default to any Logic Setup associated
with that line in a previous digital group setup.

4. Use Interval Condition is settings to create an expression describing
the triggering interval. This may be:

• Any width Less Than an Upper Value.

• Any width Greater Than a Lower Value.

• Any width In Range or Out Range of values. You may describe the

range using either:

• Limits, an absolute Upper Value and Lower Value.

• Delta, any Nominal width plus or minus a Delta width.

23

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Dropout Trigger

Dropout triggers when a signal loss is detected. The trigger is generated
at the end of the timeout period following the last edge transition that
meets the trigger conditions. It is used primarily in single-shot
applications with a pre-trigger delay.

On the Trigger dialog, select Smart trigger type, then Dropout to display
the controls.

1. Choose the Source digital line.

2. Choose the Slope (edge) to watch for transitions.

3. Choose the Logic Family that marks the transition threshold. To enter
a custom threshold, choose Logic Family User Defined and enter the
voltage Level.

NOTE: The Logic Family will default to any Logic Setup associated
with that line in a previous digital group setup.

4. Under Dropout Condition is..., enter the time interval after which to
trigger if no transition occurs at that Slope and Level.

24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operator's Manual

Qualified Trigger

Qualified arms the trigger on the A event, then fires on the B event. In
Normal trigger mode, it automatically resets after the B event. The options
for the B event depend on the type of A event. You may apply additional
Holdoff by time or number of events.

On the Trigger dialog, select Qualified or MultiStage > Qualified trigger
type to display the controls, depending on your oscilloscope.

Then, on the Qualified dialog choose the A and B events.

Besides an Edge or Pattern trigger, two special conditions may be
selected as the arming ("A") event:

• State, voltage measured above or below a threshold Level.

• PatState, a pattern that persists over a user-defined number of events

or time. Like Pattern triggers, PatState events may be analog voltage
patterns, digital logic patterns, or a mix of both, depending on the
oscilloscope's capabilities.

NOTE: On a standard oscilloscope, Pattern and PatState events will
default to the analog pattern setup dialog. On a Mixed-Signal oscilloscope,
Pattern and PatState events will default to the digital pattern setup dialog.

Once you've selected the A and B events on the Qualified dialog, set up
the conditions on the respective sub-dialogs exactly as you would a
single-stage trigger.

25

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

MS-250 Mixed Signal Oscilloscope Option

Reference

Returning a Product for Service

Contact your local Teledyne LeCroy service center for annual factory
calibration or other service. If the product cannot be serviced on location,
the service center will give you a Return Material Authorization (RMA)
code and instruct you where to ship the product. All products returned to
the factory must have an RMA.

Return shipments must be prepaid. Teledyne LeCroy cannot accept COD
or Collect shipments. We recommend air-freighting. Insure the item you’re
returning for at least the replacement cost.

1. Remove all accessories from the device.

2. Pack the product in its case, surrounded by the original packing
material (or equivalent). Do not include the manual.

3. Label the case with a tag containing:

• The RMA

• Name and address of the owner

• Product model and serial number

• Description of failure or requisite service

4. Pack the product case in a cardboard shipping box with adequate
padding to avoid damage in transit.

5. Mark the outside of the box with the shipping address given to you by
Teledyne LeCroy; be sure to add the following:

• ATTN: <RMA code assigned by Teledyne LeCroy>

• FRAGILE

6. If returning a product to a different country:

• Mark the shipment as a "Return of US manufactured goods for
warranty repair/recalibration."

• If there is a cost for the service, list the cost in the Value column
and the original purchase price "For insurance purposes only."

• Be very specific about the reason for shipment. Duties may have
to be paid on the value of the service.

26

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com