Ametek VTI Instruments EX1200-1538 User manual

EX1200-1538
MULTIFUNCTION COUNTER/TIMER
USER’S MANUAL
P/N: 82-0127-007
Released February 10, 2020
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509
[phone]

VTI Instruments Corp.
2 EX1200-1538: Preface
TABLE OF CONTENTS
TABLE OF CONTENTS..................................................................................................................................................2
Certification..........................................................................................................................................................4
Warranty...............................................................................................................................................................4
Limitation of Warranty.........................................................................................................................................4
Trademarks...........................................................................................................................................................4
Restricted Rights Legend......................................................................................................................................4
GENERAL SAFETY INSTRUCTIONS.............................................................................................................................5
Terms and Symbols ..............................................................................................................................................5
Warnings...............................................................................................................................................................5
SUPPORT RESOURCES ...............................................................................................................................................7
SECTION 1....................................................................................................................................................................9
INTRODUCTION.........................................................................................................................................................9
Overview ..............................................................................................................................................................9
Features...............................................................................................................................................................10
EX1200-1538 Specifications..............................................................................................................................11
Frequency Accuracy Measurement Using Digital and Analog input............................................................13
Period Measurement Using Digital Input......................................................................................................13
Period Measurement Using Analog Input .....................................................................................................13
Pulse Width Measurement Accuracy Using Digital and Analog Inputs........................................................13
Duty Cycle Measurement..............................................................................................................................14
Time Interval Measurement Accuracy Using Analog and Digital Inputs .....................................................14
SECTION 2..................................................................................................................................................................15
USING THE INSTRUMENT ........................................................................................................................................15
Unpacking...........................................................................................................................................................15
Determine System Power Requirements ............................................................................................................15
Plug-in Module Installation................................................................................................................................15
Warm-up Time ...................................................................................................................................................16
Connector Pin/Signal Assignment......................................................................................................................16
Front Panel Connector Pins Description .......................................................................................................17
EX1200-TB104P-1 Terminal Block...................................................................................................................18
Terminal Block Receiver...............................................................................................................................18
Calibration..........................................................................................................................................................19
SECTION 3..................................................................................................................................................................21
COUNTER/TIMER OPERATION.................................................................................................................................21
Overview ............................................................................................................................................................21
Inputs..................................................................................................................................................................22
Input Coupling...............................................................................................................................................22
Signal Conversion .........................................................................................................................................23
Polarity Conversion.......................................................................................................................................24
Functions ............................................................................................................................................................24
Totalizing ......................................................................................................................................................24
Edge Counting...............................................................................................................................................25
Period Measurements....................................................................................................................................25
Pulse Width Measurements...........................................................................................................................27
Duty Cycle Measurement..............................................................................................................................28
Frequency Measurement ...............................................................................................................................28
RPM Measurement........................................................................................................................................29
Time Interval Measurement ..........................................................................................................................30
Phase Measurements .....................................................................................................................................31
Quadrature Measurements.............................................................................................................................31

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EX1200-1538: Preface 3
SECTION 4..................................................................................................................................................................33
DIGITAL I/O AND ANALOG OUTPUT OPERATION....................................................................................................33
Digital I/O Operation..........................................................................................................................................33
Analog Output Operation ...................................................................................................................................34
Static Update Mode.......................................................................................................................................34
Dynamic Update Mode .................................................................................................................................34
Parallel Operation..........................................................................................................................................35
Circuit Protection................................................................................................................................................35
SECTION 5..................................................................................................................................................................37
PROGRAMMING THE INSTRUMENT ..........................................................................................................................37
Related Software Components............................................................................................................................37
Using the Driver .................................................................................................................................................37
Initializing\Closing the Instrument .....................................................................................................................37
Option Strings ...............................................................................................................................................38
Totalize Function................................................................................................................................................39
Edge Counting Function.....................................................................................................................................42
Frequency Function ............................................................................................................................................42
RPM Function.....................................................................................................................................................45
Time Interval Function .......................................................................................................................................48
Phase Difference Function..................................................................................................................................51
Quadrature Encoder Function.............................................................................................................................51
Digital I/O Function............................................................................................................................................54
Analog Output Function .....................................................................................................................................55
SECTION 6..................................................................................................................................................................57
SFP OPERATION .....................................................................................................................................................57
Introduction ........................................................................................................................................................57
General Web Page Operation .............................................................................................................................58
VTI Instruments Logo...................................................................................................................................59
EX1200-1538 Soft Front Panel...........................................................................................................................60
Counter Control Page .........................................................................................................................................61
DIO Control Page...............................................................................................................................................63
DAC Control Page..............................................................................................................................................64
Monitor Page ......................................................................................................................................................65
LED Panel.....................................................................................................................................................65
DIO Status Section........................................................................................................................................65
DAC Status Section.......................................................................................................................................65
Data Log Table..............................................................................................................................................66
Data Acquisition Section...............................................................................................................................66
Lock/Unlock Button......................................................................................................................................66
Reset Button..................................................................................................................................................66
Device Information Page....................................................................................................................................67
INDEX.........................................................................................................................................................................69

VTI Instruments Corp.
4 EX1200-1538: Preface
CERTIFICATION
VTI Instruments Corp. (VTI) certifies that this product met its published specifications at the time of shipment from
the factory. VTI further certifies that its calibration measurements are traceable to the United States National
Institute of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by that
organization’s calibration facility, and to the calibration facilities of other International Standards Organization
members.
WARRANTY
The product referred to herein is warranted against defects in material and workmanship for a period of one year
from the receipt date of the product at customer’s facility. The sole and exclusive remedy for breach of any warranty
concerning these goods shall be repair or replacement of defective parts, or a refund of the purchase price, to be
determined at the option of VTI.
For warranty service or repair, this product must be returned to a VTI Instruments authorized service center. The
product shall be shipped prepaid to VTI and VTI shall prepay all returns of the product to the buyer. However, the
buyer shall pay all shipping charges, duties, and taxes for products returned to VTI from another country.
VTI warrants that its software and firmware designated by VTI for use with a product will execute its programming
when properly installed on that product. VTI does not however warrant that the operation of the product, or
software, or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The warranty shall not apply to defects resulting from improper or inadequate maintenance by the buyer, buyer-
supplied products or interfacing, unauthorized modification or misuse, operation outside the environmental
specifications for the product, or improper site preparation or maintenance.
VTI Instruments Corp. shall not be liable for injury to property other than the goods themselves. Other than the
limited warranty stated above, VTI Instruments Corp. makes no other warranties, express or implied, with respect to
the quality of product beyond the description of the goods on the face of the contract. VTI specifically disclaims the
implied warranties of merchantability and fitness for a particular purpose.
TRADEMARKS
Java Runtime Environment™ are trademarks or registered trademarks of Sun Microsystems, Inc. or its subsidiaries
in the United States and other countries. LabVIEW™ and LabWindows/CVI™ are trademarks of National
Instruments Corporation. Visual Basic®, Windows®, and Internet Explorer® are registered trademarks of the
Microsoft Corporation or its subsidiaries. Linux® is a registered trademark of the Linux Foundation. IVI™is a
trademark of the IVI Foundation. Bonjour™ is a trademark of Apple, Inc.
RESTRICTED RIGHTS LEGEND
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subdivision (b)(3)(ii) of the
Rights in Technical Data and Computer Software clause in DFARS 252.227-7013.
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509 U.S.A.

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EX1200-1538: Preface 5
GENERAL SAFETY INSTRUCTIONS
Review the following safety precautions to avoid bodily injury and/or damage to the product.
These precautions must be observed during all phases of operation or service of this product.
Failure to comply with these precautions, or with specific warnings elsewhere in this manual,
violates safety standards of design, manufacture, and intended use of the product. Note that this
product contains no user serviceable parts or spare parts.
Service should only be performed by qualified personnel. Disconnect all power before servicing.
TERMS AND SYMBOLS
These terms may appear in this manual:
WARNING
Indicates that a procedure or condition may cause bodily injury or death.
CAUTION
Indicates that a procedure or condition could possibly cause damage to
equipment or loss of data.
These symbols may appear on the product:
ATTENTION - Important safety instructions
Frame or chassis ground
Indicates that the product was manufactured after August 13, 2005. This mark is
placed in accordance with EN 50419, Marking of electrical and electronic
equipment in accordance with Article 11(2) of Directive 2002/96/EC (WEEE).
End-of-life product can be returned to VTI by obtaining an RMA number. Fees
for take-back and recycling will apply if not prohibited by national law.
WARNINGS
Follow these precautions to avoid injury or damage to the product:
Use Proper Power Cord
To avoid hazard, only use the power cord specified for this product.
Use Proper Power Source
To avoid electrical overload, electric shock, or fire hazard, do not
use a power source that applies other than the specified voltage.
The mains outlet that is used to power the equipment must be
within 3 meters of the device and shall be easily accessible.

VTI Instruments Corp.
6 EX1200-1538: Preface
WARNINGS (CONT.)
Avoid Electric Shock
To avoid electric shock or fire hazard, do not operate this product
with the covers removed. Do not connect or disconnect any cable,
probes, test leads, etc. while they are connected to a voltage source.
Remove all power and unplug unit before performing any service.
Service should only be performed by qualified personnel.
Ground the Product
This product is grounded through the grounding conductor of the
power cord. To avoid electric shock, the grounding conductor must
be connected to earth ground.
Operating Conditions
To avoid injury, electric shock or fire hazard:
-
Do not operate in wet or damp conditions.
-
Do not operate in an explosive atmosphere.
-
Operate or store only in specified temperature range.
-
Provide proper clearance for product ventilation to prevent
overheating.
-
DO NOT operate if any damage to this product is suspected.
Product should be inspected or serviced only by qualified
personnel.
Improper Use
The operator of this instrument is advised that if the equipment is
used in a manner not specified in this manual, the protection
provided by the equipment may be impaired.
Conformity is checked by inspection.

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EX1200-1538: Preface 7
SUPPORT RESOURCES
Support resources for this product are available on the Internet and at VTI Instruments customer
support centers.
VTI Instruments Corp.
World Headquarters
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509
Phone: [phone]
Fax: [phone]
VTI Instruments
Cleveland Instrument Division
5425 Warner Road
Suite 13
Valley View, OH 44125
Phone: [phone]
Fax: [phone]
VTI Instruments
Lake Stevens Instrument Division
3216 Wetmore Avenue, Suite 1
Everett, WA 98201
Phone: [phone]
Fax: [phone]
VTI Instruments, Pvt. Ltd.
Bangalore Instrument Division
135, II & III Floors
Infantry Road
Bangalore –560 001
India
Phone: [phone]
Phone: [phone]
Fax: [phone]
Technical Support
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Visit http://www.vtiinstruments.com for worldwide support sites and service plan information.

VTI Instruments Corp.
8 EX1200-1538: Preface

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EX1200-1538: Introduction 9
SECTION 1
INTRODUCTION
OVERVIEW
The EX1200-1538 is a high-performance multifunction card designed to provide frequency
measurement, digital I/O (DIO), and digital-to-analog conversion (DAC) output capability on a
single card. This allows users the ability to accommodate a wide range of mixed signals into a
standard EX1200 series mainframe. Combining the EX1200-1538 with other cards/instruments in
the EX1200 series allows for the creation of a complete measurement system in as small as a
1U rack space.
The EX1200-1538 provides eight channels of independent 32-bit counters, sixteen channels of
isolated DIO, and two DAC channels with isolated analog output. While the refined electronic
counter functions enhance the accuracy of time and frequency domain measurements, configurable
DIO and analog output channels offer flexibility to measure and control various industrial
systems. A wide range of measurement functions make this card suitable for both electronic
functional test using ATE, as well as precision data acquisition applications. The electronic
counter utilizes a high-stability (1 ppm) 50 MHz, TCXO base clock oscillator, along with a
reciprocal counting method, to achieve a wide frequency measurement ranges spanning from
0.05 Hz to 1 MHz.
The following functionality is provided by the EX1200-1538:
Frequency/Counter
oFrequency measurements
oRPM measurements
oPulse width measurements
oEdge count/totalize functions
oDuty cycle measurement
Frequency/Counter (2-channel measurement)
oTime interval measurement
oPhase difference measurement
oQuadrature measurements
Digital I/O
oConfigurable direction per channel
oRead and write discrete channels directly
oIsolated inputs/outputs
Analog Outputs (DAC)
oProgrammable, 16-bit DAC
oIsolated outputs
oFrequency to voltage/current mode
The electronic 32-bit counter measures the time and frequency domain parameters of repetitive
and non-repetitive waveforms. The reciprocal counting technique used ensures high resolution and
accuracy even when the input signals are low frequency and not synchronized with the aperture
window. Counter channels accept both analog and digital inputs. The analog counter channels
accept inputs up to ±48 V true differential voltages making it suitable to use with almost any real-

VTI Instruments Corp.
10 EX1200-1538: Introduction
world signal without the need for external signal conditioners. Programmable hysteresis and
threshold levels over the entire input voltage range help to extract the fundamental frequency from
even the noisiest of analog input signals. Electronic counter channels can directly measure the
RPM of tooth wheel and similar sensors. The EX1200-1538 provides a unique functionality that
prevents the frequency bumps caused by the missing/extra tooth used for marking a tooth wheel
sensor’s reference. Additionally, counter channels can measure position and speed from
Quadrature encoder signal pairs, including index channel (A, B, and Z).
The onboard memory of EX1200-1538 can store up to 256,000 measurement readings and
supports the unified EX1200 triggering system. By utilizing IEEE 1588 time stamps, data samples
can be easily correlated with other systems. Measurements can be paced at a constant rate so that
time differential parameters, such as acceleration, can be calculated.
The EX1200-1538 DIO channels can be configured as inputs or outputs on a per channel basis.
Each channel is isolated from the other and accepts voltages between 2.5V and 60 V. The output
channels use solid-state switches that work in any polarity. Setting the output logic levels and
reading the input logic states are fully programmable.
DAC output channels are configurable as either constant voltage or current mode and are
independent of each other. The output range is fixed (±10 V in voltage mode, and ±20 mA in
current mode) and its levels are programmable with 16-bit resolution. Both channels are isolated
from each other and fully protected, providing the capability to be connected in series or parallel
for an even wider output range. The channel’s output can be statically updated using the API/SFP
or can be used to convert frequency measured from a counter channel to voltage/current output.
FEATURES
195 kΩ input impedance and AC/DC coupling for counter channels
Single frequency measurement range that works from 0.05 Hz to 1 MHz
Stable TCXO base clock (50 MHz ±1 ppm)
Wide differential input voltage range (±48 V) with up to 250 V working common mode
voltage
Programmable threshold and hysteresis levels with 1 mV resolution
Support for Quadrature encoder
Isolated DIO channels with up to 60 V compliance
Isolated, independent 16-bit DAC channels configurable for voltage or current output

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EX1200-1538: Introduction 11
EX1200-1538 SPECIFICATIONS
GENERAL SPECIFICATIONS
FRONT PANEL CONNECTOR
104-pin high-density D-sub
POWER CONSUMPTION
3.3 V
5 V
24 V
0.380 A
0.0081 A
0.15 A
COUNTER INPUT SPECIFICATIONS
NUMBER OF CHANNELS
8 channels (analog/digital)
DIGITAL INPUT SIGNAL RANGE
TTL
ANALOG INPUT SIGNAL RANGE
±48 V (differential)
SENSITIVITY
±500 mV
THRESHOLD &HYSTERESIS
Programmable, 1 mV step
INPUT IMPEDANCE
195 kΩ
INPUT COUPLING
AC/DC
COMMON MODE INPUT
250 VPEAK
SIGNAL FREQUENCY RANGE
DC coupling mode
AC coupling mode
0.05 Hz to 1 MHz
3 Hz to 1 MHz
MAIN TIME BASE CLOCK
50 MHz (TCXO)
TIME BASE CLOCK STABILITY
±1 ppm
COUNTER TYPE
32-bit, reciprocal counting type
MAXIMUM TOTALIZE TICK COUNT
232
MINIMUM DETECTABLE PULSE
Digital channels
Analog channels
50 ns
600 ns
RPMMEASUREMENT RANGE
3 RPM (min) to 90,000 RPM (max) –single range
SAMPLE DATA CORRELATION
IEEE 1588 time stamp
ONBOARD MEMORY
256,000 readings
REAL-TIME DATA OPERATIONS
Time based and pulse count based averaging (256 sample depth)
AVERAGING METHODS
Moving average and simple average
APERTURE TIME WINDOW
1 ms to 30 s (1 ms programming step)
MAX DATA SAMPLING SPEED
1,000,000 samples/s (into onboard buffer)
TRIGGERING
Software, Immediate, EX1200-based LXI triggers
QUADRATURE MEASUREMENT
Two channels to be paired for each encoder input
UTILITY 24V POWER SUPPLY (PIN #104)
Regulated power supply, 20 mA (Fused) maximum

VTI Instruments Corp.
12 EX1200-1538: Introduction
DIO SPECIFICATIONS
NUMBER OF CHANNELS
16
DIO INPUT SIGNAL LEVEL
Logical High
Logical Low
2.5 V to 60 V
< 2.5 V
DIO ISOLATION
Channel-to-channel, optical isolation
DIO OUTPUT SIGNALS
Optically isolated solid-state switch
OUTPUT SIGNAL COMPATIBILITY
50 mA sink/source, up to 60 V (AC/DC)
UPDATE CONTROL
Software paced
ANALOG OUTPUT (DAC) SPECIFICATIONS
NUMBER OF CHANNELS
2
OUTPUT TYPE
Constant voltage or constant current
VOLTAGE MODE RANGE
±10 V (bipolar) can supply up to 20 mA per channel
CURRENT MODE RANGE
±20 mA (bipolar) can drive up to 250 Ω load(10V compliance)
OUTPUT RESOLUTION
16-bit
ISOLATION
Channel-to-channel, galvanic
OUTPUT MODE
Static Mode or Dynamic mode (frequency to voltage/current conversion)
PROTECTION
Open and short circuit for continuous duration of time
ACCESSORIES
MATING CONNECTOR (NO CRIMP)
Description
VTI part number
Manufacturer/part number
104-pin HD D-sub mating connector with hood and pins, fixed contacts (no crimp tool required)
27-0389-104
Positronics ODD104M210GEX
MATING CONNECTOR (CRIMP-STYLE)
Description
VTI part number
Manufacturer/part number
104-pin HD D-sub mating connector, backshell and pins, crimp style
27-0390-104
Positronics ODD104M10Y0X
CRIMP TOOL
Description
VTI part number
Manufacturer/part number
Crimp tooling, includes handle and positioner, 22 AWG
70-0297-001
Positronics 9507 (tool) and 9502-4-0-0 (positioner)
PRE-ASSEMBLED,UNTERMINATED WIRING HARNESS
Description
VTI part number
104-pin HD D-sub mating connector and backshell, with 3 ft unterminated 22 AWG wire
70-0363-501
TERMINAL BLOCK
Description
VTI part number
EX1200-TB104P-1, single-ended
70-0367-011

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EX1200-1538: Introduction 13
ACCURACY CALCULATIONS
This section explains accuracy calculations for different measurements.
Frequency Accuracy Measurement Using Digital and Analog input
Digital Input
Analog Input
StDev.
Typical % Error
0.0017
0.0019
3
Maximum %
Error
0.0029
0.0034
6
Period Measurement Using Digital Input
   
 
󰇛 󰇜
Where:
Perror = Absolute period measurement error (in s)
Ferror = Absolute frequency error in measurement (in Hz)
Fin = Input frequency (in Hz)
Period Measurement Using Analog Input
   
 
󰇛 󰇜
Where:
Paerror = Absolute period measurement error using analog inputs (in s)
Pulse Width Measurement Accuracy Using Digital and Analog Inputs
For digital inputs:
󰇝󰇛󰇜󰇞
Where:
TP= Input pulse width (in s)
For analog inputs:
󰇝󰇛󰇜󰇛󰇜󰇞
Where :
TP= Input pulse width (in s)
Trgerror = Trigger error (in ns)

VTI Instruments Corp.
14 EX1200-1538: Introduction
Duty Cycle Measurement
Measured 󰇡
󰇢
Where:
TON = Input pulse ON time (in s)
TOFF = Input pulse OFF time (in s)
For TON and TOFF, measurement accuracy, refer to the Pulse Width Measurement Accuracy Using
Digital and Analog Inputs calculations.
Time Interval Measurement Accuracy Using Analog and Digital Inputs
Refer to the Pulse Width Measurement Accuracy Using Digital and Analog Inputs calculations.
Addition of 1.48 x 10-7 s offset to the pulse width measurement error for comparator slew rate
compensation. Slew rate of the comparator is 400 ns (0 V - 3.3 V LVTTL threshold 1.2 V to
detect as high).
Positive offset if analog input is the reference channel and negative offset if digital channel is the
reference.

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EX1200-1538: Using the Instrument 15
SECTION 2
USING THE INSTRUMENT
UNPACKING
When an EX1200-1538 is unpacked from its shipping carton, the contents should include the
following items:
An EX1200-1538
LXI Quick Start Guide
EX1200-1538 User’s Manual (this manual)
All components should be immediately inspected for damage upon receipt of the unit. ESD
precautions should be observed while unpacking and installing the instrument into an EX1200
series mainframe.
DETERMINE SYSTEM POWER REQUIREMENTS
The power requirements of the EX1200-1538 is provided in the Specifications section of
Section 1. It is imperative that the EX1200 mainframe provides adequate power for the modules
installed. For more information on EX1200 mainframe power consumption, please refer
Appendix B of the EX1200 Series User’s Manual (P/N: 82-0127-000). The user should confirm
that the power budget for the system (for the chassis and all modules installed therein) is not
exceeded on any voltage line.
It should be noted that if the mainframe cannot provide adequate power to the module, the
instrument might not perform to specification and possibly damage the power supply. In addition,
if adequate cooling is not provided, the reliability of the instrument will be jeopardized and
permanent damage may occur. Damage found to have occurred due to inadequate cooling will
void the warranty on the instrument in question.
PLUG-IN MODULE INSTALLATION
Before installing a plug-in module into an EX1200 system, make sure that the mainframe is
powered down. Insert the module into the base unit by orienting the module so that the metal
cover of the module can be inserted into the slot of the base unit. Position the cover so that it fits
into the module’s slot groove. Once the module is properly aligned, push the module back and
firmly insert it into the backplane connector. See Figure 2-1 for guidance.

VTI Instruments Corp.
16 EX1200-1538: Using the Instrument
FIGURE 2-1: MODULE INSTALLATION (EX1200-3048 USED AS EXAMPLE)
WARM-UP TIME
The specified warm-up time for an EX1200 system is 30 minutes. If, however, the unit is being
subjected to an ambient temperature change greater than 5 ºC, extra stabilization time is
recommended to achieve maximum performance.
CONNECTOR PIN/SIGNAL ASSIGNMENT
The EX1200-1538 uses a 104-pin, high-density D-type connector for front panel signal interface.
The tables below provides signal and connector pin assignment for the EX1200-1538. For mating
connector information, please refer to the EX1200-1538 Specifications in this manual.
Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
1
CH1_P
22
CH1_N
43
GND
64
USR_SHIELD
85
GND
2
CH2_P
23
CH2_N
44
GND
65
UNUSED
86
GND
3
CH3_P
24
CH3_N
45
GND
66
GND
87
GND
4
CH4_P
25
CH4_N
46
GND
67
UNUSED
88
GND
5
CH5_P
26
CH5_N
47
GND
68
UNUSED
89
GND
6
CH6_P
27
CH6_N
48
GND
69
QUAD_INDEX2
90
GND
7
CH7_P
28
CH7_N
49
GND
70
DIGI_SE2
91
GND
8
CH8_P
29
CH8_N
50
QUAD_INDEX1
71
QUAD_INDEX3
92
QUAD_INDEX4
9
GND
30
GND
51
DIGI_SE1
72
DIGI_SE3
93
DIGI_SE4
10
DIO1+
31
DIO1-
52
DIO9+
73
DIO9-
94
DIGI_SE5
11
DIO2+
32
DIO2-
53
DIO10+
74
DIO10-
95
DIGI_SE6
12
DIO3+
33
DIO3-
54
DIO11+
75
DIO11-
96
DIGI_SE7
13
DIO4+
34
DIO4-
55
DIO12+
76
DIO12-
97
DIGI_SE8
14
DIO5+
35
DIO5-
56
DIO13+
77
DIO13-
98
GND
15
DIO6+
36
DIO6-
57
DIO14+
78
DIO14-
99
UNUSED
16
DIO7+
37
DIO7-
58
DIO15+
79
DIO15-
100
GND
17
DIO8+
38
DIO8-
59
DIO16+
80
DIO16-
101
GND
18
AGND_DAC1
39
UNUSED
60
AGND_DAC1
81
GND
102
GND
19
AOUT_CH1-
40
AOUT_CH1+
61
AGND_DAC1
82
UNUSED
103
GND_C
20
AGND_DAC2
41
AGND_DAC1
62
AGND_DAC2
83
UNUSED
104
24V_OUTPUT
21
AOUT_CH2+
42
AOUT_CH2-
63
AGND_DAC2
84
GND
TABLE 2-1: EX1200-1538 CONNECTOR PIN SIGNAL ASSIGNMENT
PCB
Guide

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EX1200-1538: Using the Instrument 17
FIGURE 2-2: EX1200-1538 FRONT PANEL DETAIL
Front Panel Connector Pins Description
Pin Name
Description
CHx+/-
Analog input differential channels (P-Positive; N-Negative)
AOUT_CHx_+/-
Analog output channels (P-Positive; N-Negative)
AGND_DACx
Isolated GND for analog output
DIGI_SEx
Digital single ended channels
QUAD _INDEXx
Quadrature encoder’s index signals
DIO_x+/-
Digital input/output channels
GND
Common ground
GND_C
Chassis ground
24V_OUTPUT
24 V power supply output. Limited to 24 mA.

VTI Instruments Corp.
18 EX1200-1538: Using the Instrument
EX1200-TB104P-1 TERMINAL BLOCK
VTI offers a single-ended terminal block for the EX1200-1538 (P/N: 70-0367-011). The terminal
block simplifies cabling by providing screw-terminal blocks for user wiring. Signal pin mapping
for the EX1200-1538 can be seen in Table 2-2.
TB
Ref
Signal
Conn
Pin
TB
Ref
Signal
Conn
Pin
TB
Ref
Signal
Conn
Pin
TB
Ref
Signal
Conn
Pin
T1
CH1_N
22
T31
DIGI_SE4
93
T61
DIO11+
54
T91
USR_SHIELD
64
T2
CH1_P
1
T32
GND
85
T62
DIO11-
75
T92
GND
102
T3
GND
9
T33
DIGI_SE5
94
T63
DIO12+
55
T93
UNUSED
UNUSED
T4
GND
48
T34
GND
86
T64
DIO12-
76
T94
UNUSED
UNUSED
T5
CH2_N
23
T35
DIGI_SE6
95
T65
DIO13+
56
T95
UNUSED
UNUSED
T6
CH2_P
2
T36
GND
87
T66
DIO13-
77
T96
UNUSED
UNUSED
T7
CH3_N
24
T37
DIGI_SE7
96
T67
DIO14+
57
T97
UNUSED
UNUSED
T8
CH3_P
3
T38
GND
88
T68
DIO14-
78
T98
UNUSED
UNUSED
T9
GND
49
T39
DIGI_SE8
97
T69
DIO15+
58
T99
UNUSED
UNUSED
T10
GND
30
T40
GND
89
T70
DIO15-
79
T100
UNUSED
UNUSED
T11
CH4_N
25
T41
DIO1+
10
T71
DIO16+
59
T101
UNUSED
UNUSED
T12
CH4_P
4
T42
DIO1-
31
T72
DIO16-
80
T102
UNUSED
UNUSED
T13
CH5_N
26
T43
DIO2+
11
T73
QUAD_INDEX1
50
T103
UNUSED
UNUSED
T14
CH5_P
5
T44
DIO2-
32
T74
GND
90
T104
UNUSED
UNUSED
T15
GND
66
T45
DIO3+
12
T75
QUAD_INDEX2
69
T105
UNUSED
UNUSED
T16
GND
44
T46
DIO3-
33
T76
GND
91
T106
UNUSED
UNUSED
T17
CH6_N
27
T47
DIO4+
13
T77
QUAD_INDEX3
71
T107
UNUSED
UNUSED
T18
CH6_P
6
T48
DIO4-
34
T78
GND
98
T108
UNUSED
UNUSED
T19
CH7_N
28
T49
DIO5+
14
T79
QUAD_INDEX4
92
T109
UNUSED
UNUSED
T20
CH7_P
7
T50
DIO5-
35
T80
GND
100
T110
UNUSED
UNUSED
T21
GND
45
T51
DIO6+
15
T81
AGND_DAC1
18
T111
UNUSED
UNUSED
T22
GND
81
T52
DIO6-
36
T82
AOUT_CH1+
40
T112
UNUSED
UNUSED
T23
CH8_N
29
T53
DIO7+
16
T83
AOUT_CH1-
19
T113
UNUSED
UNUSED
T24
CH8_P
8
T54
DIO7-
37
T84
AOUT_CH2+
21
T114
UNUSED
UNUSED
T25
DIGI_SE1
51
T55
DIO8+
17
T85
AOUT_CH2-
42
T115
UNUSED
UNUSED
T26
GND
46
T56
DIO8-
38
T86
AGND_DAC2
20
T116
UNUSED
UNUSED
T27
DIGI_SE2
70
T57
DIO9+
52
T87
GND
43
T117
UNUSED
UNUSED
T28
GND
47
T58
DIO9-
73
T88
24V_OUTPUT
104
T118
UNUSED
UNUSED
T29
DIGI_SE3
72
T59
DIO10+
53
T89
GND
101
T119
UNUSED
UNUSED
T30
GND
84
T60
DIO10-
74
T90
GND_C
103
T120
UNUSED
UNUSED
TABLE 2-2: EX1200-1538 TO EX1200-104P-1 PIN AND SIGNAL MAPPING
Terminal Block Receiver
The EX1200-TBR chassis is a 1U receiver capable of housing six terminal blocks. The
EX1200-TBR ships with rubber feet for tabletop installations, but may be fitted with rackmount
ears for installation into a test rack (P/N: 70-0367-010).
To install a terminal block into the EX1200-TBR, insert the flanges on the side of the terminal
block into the guide rails of the desired slot. Continue to push the terminal block into the receiver
until it is secured by the rear-locking latch of the receiver. To remove the terminal block from the
EX1200-TBR, hold the center thumbscrew on the terminal block, then pull the terminal block
from the receiver.

www.vtiinstruments.com
EX1200-1538: Using the Instrument 19
Terminal Block Flange
Rear-locking latch
Cabling removed for clarity
FIGURE 2-3: TERMINAL BLOCK INSTALLATION INTO THE EX1200-TBR
CALIBRATION
Every EX1200-1538 is factory calibrated using NIST-traceable standards. Optionally, the
EX1200-1538 can be returned the factory for a complete factory calibration. VTI recommends
annual factory calibration of the EX1200-1538.

VTI Instruments Corp.
20 EX1200-1538: Using the Instrument