Teledyne Lecroy MS-250 User manual

Operator's
Manual
MS-250 Mixed Signal
Oscilloscope Option

MS-250 Mixed Signal Oscilloscope Option Operator's Manual
© 2020 Teledyne LeCroy, Inc. All rights reserved.
Users are permitted to duplicate and distribute Teledyne LeCroy
documentation for internal training purposes only. Resale or unauthorized
duplication of Teledyne LeCroy documentation materials is strictly
prohibited.
Information contained herein is classified as EAR99 under the U.S. Export
Administration Regulations. Export, reexport or diversion contrary to U.S.
law is prohibited.
Teledyne LeCroy is a registered trademark 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.
933079-00 Rev A
ms-250-om.pdf
December, 2020

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Contents
Introduction....................................................................................................... 1
Technical Overview..................................................................................................... 1
Standard Hardware..................................................................................................... 3
Accessories................................................................................................................. 5
Connecting the Mixed Signal Device .................................................................. 7
Connecting the Unit .................................................................................................... 7
Connecting Digital Leads ......................................................................................... 10
Digital Logic Setup.................................................................................................... 11
Digital Group Setup................................................................................................... 13
Displaying Digital Traces.......................................................................................... 14
Renaming Digital Lines............................................................................................. 15
Digital Triggering ............................................................................................. 16
Setting Up a Pattern Trigger..................................................................................... 16
Setting Up a Serial Trigger ....................................................................................... 19
Reference........................................................................................................ 20
Certifications............................................................................................................. 20
Technical Support..................................................................................................... 20
Returning a Product for Service............................................................................... 21
Warranty .................................................................................................................... 22

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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.
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, but it does not require the user
to input a clock.
The USB 2.0 connection downloads the trigger setup from the oscilloscope
and uploads digital data from to the oscilloscope.

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While in SINGLE, NORMAL, or AUTO trigger mode, the MS-250 repeatedly
samples each digital channel’s voltage level. If the voltage is above the
threshold, the MS-250 stores a 1 in internal memory; if it is below threshold,
a 0 is stored.
Figure 1. MS-250 sampling.
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 USB 2.0 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.
In any trigger mode (AUTO, NORMAL, SINGLE), pressing STOP trigger
cancels the acquisition, which leaves the previously acquired data
unchanged.

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Standard Hardware
The MS-250 is delivered with the following hardware in a carrying case:
Part
Description
QTY
Mixed Signal
Accessory
Provides 18-channel digital acquisition and triggering.
1
16" Digital
Leadset
Connects the MS-250 to the device under test. The lead set
terminates in a 25 mil pin socket. Micro-grippers of various
sizes that may be connected to the lead set are available as
accessories from Teledyne LeCroy, The lead set is divided
into two banks. Each lead is color-coded to the resistor
color-coding standard and has an individual ground
connection. In addition, there are two common ground leads
available for use.
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Part
Description
QTY
Bus Cable
1.3 m cable connects the Mixed Signal Accessory to the
main oscilloscope unit for timebase synchronization, cross-
triggering and power. Includes USB 2.0 cable.
1
3" Flexible
Ground Lead
Lead for grounding individual digital inputs
5
Ground
Extender
Connects to ground port of any digital input and makes a
simple signal and ground connection to a 0.1” square pin
header.
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Accessories
You may purchase these optional accessories separately:
Accessory
Part Number
Description
Digital Leadset
MSO-DLS-18
Additional 16" leadset for inputting lines
D0-D17. This can be useful if you have more
than one device under test and don't wish to
disconnect/reconnect leads.
Large Gripper
Probe Set
PK400-1
Large gripper probe set for 0.10 inch
(2.54 mm) pin pitch. Includes 10 probes with
color-coded leads.
Medium Gripper
Probe Set
PK400-2
Medium gripper probe set for 0.04 inch
(1.00 mm) pin pitch. Includes 10 probes with
color-coded leads.

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Accessory
Part Number
Description
Small Gripper
Probe Set
PK400-3
Small gripper probe set for 0.008 inch
(0.2 mm) pin pitch. Includes 10 probes with
color-coded leads.
Mictor Cable
MSO-MICTOR
Mictor Connection cable, 16" (40.64 cm),
36 channel connector
Interconnect
Cable
MSO-3M
Interconnect cable, 16" (40.64 cm), mates
with 3M connectors 2520-6002 and
2520-5002.