Measurement Computing LGR-5320 Series User manual

LGR-5320 Series
Stand-Alone, High-Speed, Analog and Digital I/O Data Loggers
Document Revision 2
October 2013
© Copyright 2013
User's Guide

HM LGR-5320-Series
Your new Measurement Computing product comes with a fantastic extra —
Management committed to your satisfaction!
Thank you for choosing a Measurement Computing product – and congratulations! You own the finest, and you can now enjoy
the protection of the most comprehensive warranties and unmatched phone tech support. It’s the embodiment of our mission:
To provide data acquisition hardware and software that will save time and save money.
Simple installations minimize the time between setting up your system and actually making measurements. We offer quick and
simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system.
Limited Lifetime Warranty: Most MCC products are covered by a limited lifetime warranty against defects in materials or
workmanship for the life of the product, to the original purchaser, unless otherwise noted. Any products found to be defective in
material or workmanship will be repaired, replaced with same or similar device, or refunded at MCC’s discretion. For specific
information, please refer to the terms and conditions of sale.
Harsh Environment Program: Any Measurement Computing product that is damaged due to misuse, or any reason, may be
eligible for replacement with the same or similar device for 50% of the current list price. I/O boards face some harsh
environments, some harsher than the boards are designed to withstand. Contact MCC to determine your product’s eligibility for
this program.
30 Day Money-Back Guarantee: Any Measurement Computing Corporation product may be returned within 30 days of
purchase for a full refund of the price paid for the product being returned. If you are not satisfied, or chose the wrong product by
mistake, you do not have to keep it.
These warranties are in lieu of all other warranties, expressed or implied, including any implied warranty of merchantability or
fitness for a particular application. The remedies provided herein are the buyer’s sole and exclusive remedies. Neither
Measurement Computing Corporation, nor its employees shall be liable for any direct or indirect, special, incidental or
consequential damage arising from the use of its products, even if Measurement Computing Corporation has been notified in
advance of the possibility of such damages.
Trademark and Copyright Information
Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are either trademarks
or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights & Trademarks section on
mccdaq.com/legal for more information about Measurement Computing trademarks. Other product and company names
mentioned herein are trademarks or trade names of their respective companies.
© 2013 Measurement Computing Corporation. All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording, or otherwise
without the prior written permission of Measurement Computing Corporation.
Notice
Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use
in life support systems and/or devices without prior written consent from Measurement Computing Corporation.
Life support devices/systems are devices or systems that, a) are intended for surgical implantation into the body, or
b) support or sustain life and whose failure to perform can be reasonably expected to result in injury. Measurement
Computing Corporation products are not designed with the components required, and are not subject to the testing
required to ensure a level of reliability suitable for the treatment and diagnosis of people.

3
Table of Contents
Preface
About this User's Guide .......................................................................................................................5
What you will learn from this user's guide .........................................................................................................5
Conventions in this user's guide .........................................................................................................................5
Where to find more information.........................................................................................................................5
Chapter 1
Introducing the LGR-5320 Series ........................................................................................................6
Functional block diagram...................................................................................................................................7
Chapter 2
Installing a LGR-5320 Series Device...................................................................................................8
What comes with your shipment?.......................................................................................................................8
Hardware .......................................................................................................................................................................... 8
Software............................................................................................................................................................................ 8
Optional components........................................................................................................................................................ 8
Documentation.................................................................................................................................................................. 8
Unpacking...........................................................................................................................................................8
Installing the software ........................................................................................................................................9
Installing the device............................................................................................................................................9
Setting up a device in USB mode ....................................................................................................................................10
Setting up a device in Logging mode...............................................................................................................................10
Replacing the internal 3 V lithium cell battery.................................................................................................10
Chapter 3
Functional Details ...............................................................................................................................12
External components ........................................................................................................................................12
Function buttons and LEDs (top of case).........................................................................................................................12
Screw terminals and associated LEDs .............................................................................................................................14
Signal connections............................................................................................................................................15
Analog input....................................................................................................................................................................15
Trigger input....................................................................................................................................................................16
Digital I/O........................................................................................................................................................................21
Counter input...................................................................................................................................................................22
Mechanical drawings........................................................................................................................................28
Chapter 4
Specifications......................................................................................................................................29
Analog input.....................................................................................................................................................29
Analog input calibration...................................................................................................................................30
External clock input..........................................................................................................................................30
Input sequencer.................................................................................................................................................31
Triggering.........................................................................................................................................................31
External analog trigger .....................................................................................................................................32
Digital input......................................................................................................................................................32
Digital output....................................................................................................................................................33
Fault tolerance ..................................................................................................................................................33
Counters............................................................................................................................................................34
Device configuration ........................................................................................................................................35
Controls/indicators............................................................................................................................................35
Data memory ....................................................................................................................................................35
Power................................................................................................................................................................36

LGR-5320 Series User's Guide
4
Chassis ground..................................................................................................................................................36
USB specifications ...........................................................................................................................................36
Environmental ..................................................................................................................................................37
Mechanical .......................................................................................................................................................37
Screw terminal connector type .........................................................................................................................37
LGR-5325 screw terminal pinout.....................................................................................................................................38
LGR-5327/5329 screw terminal pinout............................................................................................................................40
Declaration of Conformity..................................................................................................................42

5
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing LGR-5320 Series data acquisition and data logging
devices and lists device specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about LGR-5320 Series hardware is available on our website at www.mccdaq.com. You
can also contact Measurement Computing Corporation by phone, fax, or email with specific questions.
Knowledgebase: kb.mccdaq.com
Phone: [phone] and follow the instructions for reaching Tech Support
Fax: [phone] to the attention of Tech Support
Email: [e-mail]

6
Chapter 1
Introducing the LGR-5320 Series
The LGR-5320 Series includes the following devices:
LGR-5325
LGR-5327
LGR-5329
LGR-5320 Series devices are USB 2.0 full-speed devices supported under Microsoft Windows 7/Vista/XP (32-
bit or 64-bit). LGR-5320 Series devices are compatible with both USB 1.1 and USB 2.0 ports.
Each LGR-5320 Series device provides the following features:
a multiplexed 16-bit A/D converter
16 single-ended (SE) or eight differential (DIFF) analog input channels
16 digital input connections
screw terminals for field wiring connections
The LGR-5325 has a maximum sampling rate of 100 kS/s and software-selectable analog input ranges of
±10 V, ±5 V, and ±1 V for all analog input channels. The LGR-5327 and LGR-5329 each has a maximum
sampling rate of 200 kS/s and software-selectable analog input ranges of ±30 V ±10 V, ±5 V, and ±1 V for all
analog input channels.
The LGR-5329 provides 16 isolated digital input connections including PLC thresholds with 30 V tolerance,
and 500 V of isolation between the digital inputs and the host computer, analog inputs, and counter inputs. The
LGR-5325 and LGR-5327 provide 16 digital input connections including TTL thresholds with 28 V tolerance.
You can configure the DIO connections on all LGR-5320 Series devices to detect and log events based on
change of state or pattern recognition.
LGR-5320 Series devices have a single digital alarm output that is implemented as a single Form C relay. You
can configure the relay to energize when the trigger condition is met and data is being recorded.
Each LGR-5320 Series device has four counter channels that support the following counter modes:
Counter (general event counting)
Period counting
Pulse width counting
Edge-to-edge timing
Up/down counting
The LGR-5327 and LGR-5329 counter channels also support 1X, 2X, and 4X encoder counting. You can
configure each encoder counter channel for single-ended or differential mode using an external switch.
LGR-5320 Series devices save data to and retrieve data from a Secure Digital (SD) or Secure Digital High
Capacity (SDHC) memory card. All devices require 9 VDC to 30 VDC of external power.
Connect all signals to the screw terminals.

LGR-5320 Series User's Guide Introducing the LGR-5320 Series
7
Functional block diagram
LGR-5320 Series functions are illustrated in Figure 1.
Figure 1. LGR-5320 Series functional block diagram
SD
Connector
USB
Connector
FLASH
FPGA
Coin battery
Digital Inputs (x16)
Relay Output
Counter Inputs (x4)
(Quadrature
counters included
on LGR-5327/5329)
Digital Trigger
Input
Analog Trigger
Input
Sampling
Clock Input
Power Supplies
Barrel
Connector Screw Terminal
GPIO
Ext. Bus
MCI
RTC
USB
Config
Microcontroller
Multiplexer
(16:1) Gain &
Level shift ADC
SPI
500V isolation
(LGR-5329 only)

8
Chapter 2
Installing a LGR-5320 Series Device
What comes with your shipment?
Verify that the following hardware components are included in the shipment:
Hardware
LGR-5320 Series device – LGR-5325, LGR-5327, or LGR-5329
USB cable (2-meter length)
SD card
9 VDC, 1 A external power supply for use when LGR-5320 Series is not powered through the screw
terminals
Software
DAQLog CD
Optional components
ACC-202 Din-rail kit
Accessory for mounting a LGR-5320 Series device to a standard DIN rail. Use the thread-forming screws to
attach the DIN rail clip to your device.
Documentation
In addition to this hardware user's guide, a DAQLog Quick Start is included with the
LGR-5320 Series shipment. This booklet provides instructions about installing the software and logging data.
Unpacking
As with any electronic device, take care while handling to avoid damage from static electricity. Before
removing the LGR-5320 Series device from its packaging, ground yourself using a wrist strap or touch either
the computer chassis or other grounded object to eliminate any stored static charge.
If the device is damaged, notify Measurement Computing Corporation immediately by phone, fax, or email.
Knowledgebase: kb.mccdaq.com
Phone: [phone] and follow the instructions for reaching Tech Support
Fax: [phone] to the attention of Tech Support
Email: [e-mail]
For international customers, contact your local distributor. Refer to the International Distributors section on our
web site at www.mccdaq.com/International.
Thread-forming
screws

LGR-5320 Series User's Guide Installing a LGR-5320 Series Device
9
Installing the software
Refer to the DAQLog Quick Start for instructions on installing and using the DAQLog software.
Installing the device
When you install a LGR-5320 Series device, you can set it up to operate in one of the following modes:
USB mode—The device is connected to a USB port on your host computer, and controlled by USB
command. Use this mode to configure and load logger settings to a logger using DAQLog software.
Logging mode—The device has no active USB connection, all buttons on the logger are enabled, and the
device can read from or write to an installed SD card. Use this mode to load configuration settings and log
data using LGR-5320 Series logger features.
LGR-5320 Series logger operation modes are illustrated in Figure 2.
Figure 2. LGR-5320 Series USB mode/logging mode state diagram
Idle, card
inserted
Logging
mode
Read config,
activity LED
blinks
Write config,
activity LED
blinks
Toggle
indicators
Idle, no card Card removed
Card inserted
Write button
Status LED
blinking
Error
Any button
No error
Read button
No error
Error
Ind button
Start button
Exit logging
Detect SD
card
Card present
No card
USB mode
Initialize
hardware
Power on
USB host detected
USB host detected
Status LED
blinks
Any button

LGR-5320 Series User's Guide Installing a LGR-5320 Series Device
10
Setting up a device in USB mode
Complete the following steps to set up a LGR-5320 Series device in USB mode:
1. Connect the 9 VDC, 1 A external power supply to the external power connector (see Figure 4 on page 12),
and plug the adapter into an electrical outlet. 1
2. If the device is configured for Autostart new log upon device powerup in DAQLog, press the Start
button on the device to stop logging before connecting the USB cable to your computer.
3. Turn the computer on, and connect a USB cable from the USB connector on the device (see Figure 4 on
page 12) to either a USB port on the computer or an external USB hub connected to the computer.
4. When you connect a LGR-5320 Series device for the first time, a Found New Hardware message opens as
the device is detected. When the message closes, the installation is complete.
In USB mode, the buttons on the logger are disabled, and the device cannot read from or write to an installed
SD card. Access to the SD card can only be made over the USB connection.
Use DAQLog software to configure the device directly or to create a file with device configuration settings.
Refer to the DAQLog Help and DAQLog Software User's Guide for instruction about using DAQLog to
configure a LGR-5320 Series device.
Setting up a device in Logging mode
Complete the following steps to set up a LGR-5320 Series device in Logging mode:
1. Insert the SD card with the settings file into the card slot on the device, and disconnect the USB cable from
the device.
2. Either connect the device to an electrical outlet (refer to step 1 under Setting up a device in USB mode
above), or connect the PWR+ terminal to the positive lead of your power source, and the PWR– terminal to
the negative lead of the power source. Use a power source that meets the power specifications of the LGR-
5320 Series.
3. Connect the LGR-5320 Series device screw terminals to their signal source.
4. Press LOAD on the device to load the settings file to the device if required.
5. Press START on the device to begin logging data.
6. When the LOG LED turns off, the device is done logging.
Replacing the internal 3 V lithium cell battery
LGR-5320 Series devices include a 3 V lithium cell battery that retains the real-time clock value when the
device is powered off. If you get incorrect year readings from a device, you may need to replace this battery.
Caution! The discharge of static electricity can damage some electronic components. Before removing the
LGR-5320 Series device from its housing, ground yourself using a wrist strap or touch the
computer chassis or other grounded object to eliminate any stored static charge.
Complete the following steps to replace the internal 3 V lithium cell battery in a LGR-5320 Series device:
1. Turn the device over and rest the top of the housing on a flat, stable surface.
2. Remove the five screws from the bottom of the device.
3. Hold both the top and bottom sections together, turn the device over and rest it on the surface, and then
carefully remove the top section of the case to expose the circuit board.
4. Lift the clip holding the cell battery in the battery compartment and remove the old battery from the
compartment.
1Providing power to a LGR-5320 Series device before connecting its USB cable to the computer allows the device to inform
the host computer (when the USB cable is connected) that the device requires minimal power from the USB port.

LGR-5320 Series User's Guide Installing a LGR-5320 Series Device
11
Figure 3 shows the location of the battery compartment on the board.
Figure 3. Location of battery compartment
5. Lift the clip and insert the new battery in the battery compartment. Make sure the positive side of the
battery (+) is facing up and away from the circuit board.
6. Replace the top section of the case, and fasten it to the bottom section with the five screws.

12
Chapter 3
Functional Details
External components
The external components of a LGR-5320 Series device shown in Figure 4 are explained in the following
sections.
1 Screw terminals 1 through 48 5 SD card slot
2 Function buttons and LEDs 6 External power connector
3 Screw terminals 49 through 96 7 USB connector
4 Recessed reset button 8 Power LED (top) and USB activity LED (bottom)
Figure 4. LGR-5320 Series external components
Function buttons and LEDs (top of case)
Each function button on the top of a LGR-5320 Series device case is explained below. All buttons and LEDs are
disabled when a LGR-5320 Series device is connected to a USB port.
SD ACT LED—Blinks when data is read from or written to the SD card.
Caution! Do not remove the SD card when the SD ACT LED is blinking.
SD STAT LED—Turns on for one second if you attempt an operation without inserting an SD card in the
slot.
The LED blinks when:
othe logger detects an error on the SD card or SD drive
othe configuration file on the SD card is invalid
oa data overrun error has occurred when the device is logging data

LGR-5320 Series User's Guide Functional Details
13
When the SD STAT LED blinks to indicate an error, the four LEDs for analog channels CH0H, CHOL,
CH1H, CH1L, and the four LEDs for analog channels CH6H, CH6L, CH7H, and CH7L blink in a pattern
that represents a numeric error code. Press any button on the top of the case to acknowledge the error and
stop the LEDs from flashing.
Figure 5. LGR-5320 Series error code LEDs
For example, if you attempt to log without an SD card inserted in a LGR-5320 Series device, the CHOH
and CH7L LEDs both blink, representing binary code 0001.
All SD STAT errors and corresponding analog input LED blink codes are explained below.
LGR-5320 Series error descriptions and codes
Error Blink code
(binary ) LED pattern
CH1L CH1H CH0L CH0H
CH6H CH6L CH7H CH7L
Card not present 0001
Card not mounted 0010
Card write protected 0011
File system error 0100
FLASH write error 0101
Overrun – pacer 0110
Overrun – FIFO 0111
Overrun – events 1000
DMA error 1001
Card full 1010
File reached max size 1011
Log configuration error 1100
Log configuration not valid for device 1101
LOG LED—On when the device is logging. Off when the device is idle.
TRIG LED—Turns on when the acquisition is triggered.
EVENT LED—Blinks when an event occurs.

LGR-5320 Series User's Guide Functional Details
14
IND button—Cycles through and selectively enables/disables LEDs with each button press. By default, all
LEDs are enabled when the device is powered on.
oIf you press the button when the LEDs are in their default setting, only the LEDs on top of the device
are enabled.
oIf you press the button again, all LEDs are disabled.
oIf you press the button again, all LEDs are enabled.
TRIG/EVENT button—Forces a trigger if logging has started and the device is waiting for a trigger. Adds an
event to the event log if they are being recorded.
START button—Starts logging when an SD card with a valid configuration file is in the SD card slot, and
the device is disconnected from a USB port. When a device is logging data, pressing this button stops the
data logging.
SAVE button—Saves the current logging configuration to a file on the SD card.
LOAD button—Loads the latest logging configuration file from the SD card.
Screw terminals and associated LEDs
1 Digital input terminals and LEDs 4 Analog input 0–3, 8–11 (SE), 0–3 (Diff) terminals and LEDs.
2 Digital trigger, pacer, isolated, earth, and analog ground
terminals, and digital output state LED 5 Counter input 0 and 1 terminals, LEDs, and configuration switches*
3 Analog input 4–7, 12–15 (SE), 4–7 (Diff) terminals and
LEDs 6 Counter input 2 and 3 terminals, LEDs, and configuration switches*
* Configuration switches only apply to quadrature counters and
are only installed on the LGR-5327 and LGR-5329.
Figure 6. LGR-5320 Series screw terminals and LEDs
Figure 7. Screw terminal LED on

LGR-5320 Series User's Guide Functional Details
15
Screw terminal LED functions
The functions of the LEDs associated with screw terminals are explained below.
The LED for each active digital connection is on when voltage is detected.
The LED near the PWR+ terminal is on when the relay is energized
The LED for each analog input terminal is on if the associated channel is in the scan list.
On the LGR-5327 and LGR-5329, you can configure the encoder counter inputs as single-ended or differential
mode using the switches that correspond to each pair of phase A, phase B, and Index terminals (see Figure 8).
Figure 8. LGR-5327 and LGR-5329 counter channel input terminals and input mode switches
To configure a counter channel for single-ended mode, slide the switch to the right. Note that the "dot" is
visible on the switch when a channel is configured for single-ended mode.
To configure a counter channel for differential mode, slide the switch to the left.
Figure 9. Channel input mode switch settings
Figure 9 assumes a board orientation with the USB connector on the right.
Signal connections
Analog input
LGR-5320 Series devices have a 16-bit, multiplexed A/D that supports up to 16 single-ended or up to eight
differential analog inputs.
For the LGR-5325, the maximum throughput sample rate is 100 kS/s.
For the LGR-5327 and LGR-5329, the maximum throughput sample rate is 200 kS/s.

LGR-5320 Series User's Guide Functional Details
16
Analog input SE and DIFF channel configurations
Single-ended analog channels 0–3
CH0H = channel 0 SE
CH1H = channel 1 SE
CH2H = channel 2 SE
CH3H= channel 3 SE
Single-ended analog channels 8–11
CH0L = channel 8 SE
CH1L = channel 9 SE
CH2L = channel 10 SE
CH3L = channel 11 SE
Single-ended analog channels 4–7
CH4H = channel 4 SE
CH5H = channel 5 SE
CH6H = channel 6 SE
CH7H=channel 7 SE
Single-ended analog channels 12–15
CH4L = channel 12 SE
CH5L = channel 13 SE
CH6L = channel 14 SE
CH7L = channel 15 SE
Differential analog channels 0–3
CH0H /CH0L through CH3H /CH3L Differential analog channels 4–7 CH4H /CH4L through CH7H /CH7L
You can configure all LGR-5320 Series analog input channels for voltage input ranges of ±10 V, ±5 V, or ±1 V.
The LGR-5327 and LGR-5329 also support a ±30 V voltage input range.
Unused analog input channels can either be left floating or connected to an AGND pin.
When using the ±30 V input range with the LGR-5327 and LGR-5329, keep source impedance and source
capacitance as small as possible to minimize settling time, gain, and bandwidth errors.
When connecting differential inputs to floating voltage sources in the ±10 V, ±5 V, ±1 V ranges, the user must
provide a DC return path from the low channel (CHxL) connector of each differential input to ground. To do
this, simply connect a resistor from the CHxL connector of the differential inputs to AGND. A value of
approximately 100 kΩ can be used for most applications.
On the LGR-5325, the AGND and GND terminals are tied together internally. These grounds are electrically
isolated from the EGND (earth ground) terminal block pin.
On the LGR-5327, the AGND, ENC, and GND terminals are tied together internally. These grounds are
electrically isolated from the EGND terminal block pin.
On the LGR-5329, the AGND, ENC, and GND terminals are tied together internally. These grounds are
electrically isolated from the EGND and the IGND (isolated ground) terminal block pins.
Trigger input
The LGR-5320 Series supports the following trigger modes to accommodate certain measurement situations.
External digital trigger
External analog trigger (single-channel)
Digital pattern trigger
The LGR-5327 and LGR-5329 also support multichannel analog trigger mode.
To manually trigger an acquisition, press the TRIG/EVENT button.
Digital and analog triggers connected
The input of the digital trigger and the output of the single-channel analog signal comparator are connected
directly to hardware circuits to provide low-latency triggering. Latencies should be low (around 1.5 µs).
External digital trigger
A digital (or TTL-level) trigger starts an acquisition when the trigger condition is met at the DTRIG terminal.
When using digital triggering, the TTL trigger signal on the DTRIG connector is for a trigger condition. When
the selected condition occurs, it is the trigger event.
If the LGR-5320 Series device is ready for a trigger, then the trigger event occurs.

LGR-5320 Series User's Guide Functional Details
17
If the LGR-5320 Series device is not ready due to one of the following reasons, the trigger is ignored:
Incomplete configuration
The device is finishing the previously triggered acquisition
LGR-5320 Series devices do not indicate when a trigger is ignored.
External analog trigger (single-channel)
The input signal on the ATRIG terminal is compared to a programmable analog trigger level.
If the analog input trigger condition is met, the LGR-5320 Series device generates an internal trigger signal.
If the device is ready for a trigger, then the trigger event occurs.
If the device is not ready—due to incomplete configuration, or because the device is finishing the
previously triggered acquisition—the trigger is ignored.
LGR-5320 Series devices do not indicate when a trigger is ignored.
Hysteresis—The analog trigger circuit has hysteresis to reduce the occurrence of false triggering due to input
noise.
Hysteresis is the range that a signal must pass through before a trigger is generated. This prevents false triggers
from happening when small amounts of noise exist on the signal.
Figure 10 shows the hysteresis effect for a rising-edge trigger.
Figure 10. Hysteresis effect on a rising-edge trigger
A trigger occurs when the analog input rises above the trigger level, or threshold –but only after the input level
has been below the hysteresis range. If the level briefly drops just below the threshold—perhaps due to noise –
and then rises above it again, no trigger occurs, since the signal did not drop below the hysteresis range.
After the level drops below hysteresis, it can then produce a trigger by rising above the threshold.
Multichannel trigger (LGR-5327 and LGR-5329 only)
A multichannel trigger event is a combination of measured channel values.
The FPGA samples the specified channels, and if programmable conditions are met, triggers the acquisition.
Multichannel triggering examines digitized data, and the trigger latencies are much greater than the external
analog and digital triggers.
If minimum trigger latency is not critical in your application, you may be able to take advantage of
multichannel triggering.
The FPGA looks at (scans) digitized input channels and examines each one to determine if it meets
programmed levels for a valid trigger. This multichannel triggering is a two-step process:
1. The FPGA examines each of its specified input signals to determine if the trigger is valid.
2. After all of the channels have been examined, the FPGA logically combines the individual triggers to
generate the actual trigger. You can program the FPGA to generate a trigger if any individual trigger is
valid (OR) or if all triggers are valid (AND) (see Figure 11)
Trigger
No
Trigger
No
Trigger
Threshold Level
Hysteresis Range
Amplitude
Time
Hysteresis Level

LGR-5320 Series User's Guide Functional Details
18
Figure 11. Multichannel trigger detection
The logical relationship among three elements—polarity, duration, and initialization—determine if a trigger is
valid in a multichannel environment.
Analog trigger types (LGR-5325) and multichannel trigger types (LGR-5327/5329)
Each trigger type is a combination of three elements: slope, duration, and initialization.
Slope (above/rising or below/falling)—Sets whether the trigger is valid when the signal is above the threshold
(rising) or below the threshold (falling).
Duration (instantaneous or latched)—Specifies the action to take if the signal level becomes invalid after it has
been valid:
Instantaneous triggers are valid in scans where that channel trigger condition is met. They can become
invalid in subsequent scans when the trigger condition is not met.
With the LGR-5327 and LGR-5329, instantaneous triggers are used to trigger when all channels triggers
are valid (multichannel "AND" mode) or when any of the channel trigger conditions are valid
(multichannel "OR" mode).
Latched triggers remain valid until the acquisition is complete. These trigger types are used to trigger scans
when two or more signals have already become valid.
With the LGR-5327 and LGR-5329, you can use a combination of instantaneous and latched triggers in
multichannel triggering.
The trigger duration only makes a difference in multichannel AND triggering.
In multichannel "OR" triggering, the acquisition is triggered as soon as any channel becomes valid—what
happens when a channel becomes invalid does not matter.
In contrast, "AND" triggering waits for all triggers to be valid, making latching important for rapidly
changing signals.
Initialization (level or edge)—Specifies the sequence necessary for a signal to be a valid trigger:
Level triggers become valid when they reach or exceed the threshold, even if they are already past the
threshold when the acquisition starts.
Edge triggers first wait until the signal level is invalid. Then they wait for the signal to reach the threshold
before becoming valid. Thus, level triggers look for a signal level, whenever it occurs, and edge triggers
look for a rising or falling transition that reaches the threshold.
Trigger
logic
AND
(all)
OR
(any)
Trigger
detector
Trigger
detector
Trigger
detector
Analog
input
signals
Invalid trigger
Valid trigger
Valid trigger
Re-arm command
from control circuits
No trigger
Trigger

LGR-5320 Series User's Guide Functional Details
19
The first step in both multichannel and analog triggering is to examine the input signals. To determine trigger
validity, the FPGA can examine each input signal in one of eight ways. Refer to the following table.
LGR-5325, LGR-5327, LGR-5329 trigger signal attributes
Trigger type Slope Duration Initialization
Above-level N/A Instantaneous Level
Below-level N/A Instantaneous Level
Above-level-with-latch N/A Latched Level
Below-level-with-latch N/A Latched Level
Rising-edge Rising Instantaneous Edge
Falling-edge Falling Instantaneous Edge
Rising-edge-with-latch Rising Latched Edge
Falling-edge-with-latch Falling Latched Edge
The input signals are compared a specified signal level.
Above-level trigger—This trigger is valid whenever the signal goes above the specified level, and stays valid
until the signal goes below the level.
In Figure 12, the channel trigger is valid during the two shaded intervals.
With the LGR-5327 and LGR-5329, whether or not this condition triggers an acquisition depends on the type of
multichannel triggering (AND or OR) and on the state of other trigger channels.
With OR multichannel triggering, the LGR-5327 and LGR-5329 triggers a scan when the signal first rises
above the threshold. If the device is ready and the condition is met, the scan is triggered.
With AND multichannel triggering, the LGR-5327 and LGR-5329 does not trigger a scan until every
specified trigger channel is valid. If all other trigger channels are valid, the device triggers an acquisition
when the signal reaches the shaded region. If some channels are not valid, however, this channel has no
effect.
Figure 12. Above level initialization, instantaneous duration
Below-level trigger—This trigger is valid whenever the signal level is below the level and stays valid until the
signal goes above the level—the opposite of above-level triggering.
With the LGR-5327 and LGR-5329, as with all multichannel trigger types, the acquisition's actual trigger
depends on the combination of this trigger with the other channels' trigger states.
Figure 13. . Below level initialization, instantaneous duration
Above-level-with-latch trigger—With this trigger type, the channel becomes valid when the signal level is
above the threshold, and remains valid until the acquisition is complete and re-armed.
Figure 14. Above level initialization, latched duration
Level
Trigger Trigger
Trigger Trigger
Level
Trigger Trigger
Trigger
Trigger
Trigger
Level

LGR-5320 Series User's Guide Functional Details
20
Below-level-with-latch trigger—With this trigger type, the channel becomes valid when the signal level is
below the threshold and remains valid until the acquisition is complete and re-armed—the opposite of above-
level-with-latch triggering). Latched triggers are often used in multichannel "AND" triggering—the acquisition
does not trigger until all trigger channels are valid. After a latched trigger becomes valid, it stays valid and waits
for the other triggers to become valid until the acquisition is triggered and completed.
If the trigger is not latched, the channel may not stay valid. A LGR-5320 Series device does not trigger the
acquisition until the channel becomes valid again, and all channels simultaneously reach their thresholds.
Latched triggering is used to trigger an acquisition after an event has occurred, while non-latched triggering is
used only during the simultaneous occurrence of desired signal levels. It is possible to combine different trigger
types in a single multichannel trigger.
For example, by configuring channel 3 for below-level triggering, and channel 2 for above-level-with-latch
triggering, the device could trigger the acquisition when channel 3 is below 0.9 V after channel 2 has gone
above –1.3 V.
Figure 15. Below level initialization, latched duration
Rising-edge trigger—This trigger becomes valid after the signal level has been below the hysteresis range and
then goes above the threshold. This trigger becomes invalid when the signal level goes below the hysteresis
range. Unlike above-level triggering, the channel cannot become valid until the signal level first goes below the
hysteresis range. This prevents the false triggering that would occur if the signal were above the threshold at the
start of the acquisition.
Figure 16: Rising edge, instantaneous duration, edge initialization
Falling-edge trigger—This trigger is the reverse of the rising-edge trigger: the trigger becomes valid after the
signal level has been above the hysteresis range and then goes below the threshold. This trigger becomes invalid
whenever the signal level goes above the hysteresis range. This prevents the false triggering that would occur
with below-level triggering if the signal was below the threshold at the start of the acquisition.
Figure 17: Falling slope, instantaneous duration, edge initialization
Trigger
Level
Threshold
Hysteresis
Trigger
No
Trigger
Hysteresis
No
Trigger
No
Trigger
Hysteresis
Trigger Threshold
No Trigger
No Trigger
No Trigger