IOtech Personal Daq/3000 User Manual

Personal daq/3000 series usb 1-mhz, 16-bit multifunction modules

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Installation manual (12 pages)

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Page 1 Phone: (440) 439-4091 Fax: (440) 439-4093 E-mail (Product Information): sales@iotech.com E-mail (Technical Support): productsupport@iotech.com Internet: www.iotech.com Personal Daq/3000 Series User’s Manual USB 1 MHz, 16-Bit Multifunction Modules 1136-0901 Rev. © 2005 by IOtech, Inc. Printed in the United States of America 957894...
Page 3: Limitation Of Liability
IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this product. Copyright, Trademark, and Licensing Notice All IOtech documentation, software, and hardware are copyright with all rights reserved. No part of this product may be copied, reproduced or transmitted by any mechanical, photographic, electronic, or other method without IOtech’s prior written consent.
Page 4 Start [Desktop “Start” pull-down menu] ⇒ Programs ⇒ IOtech DaqX Software You can also access the PDF documents directly from the data acquisition CD by using the <View PDFs> button located on the opening screen. Refer to the PDF documentation for details regarding both hardware and software.
Page 5 Theory of Operation…… 1-3 Software …… 1-15 2 – Connections and Pinouts Overview …… 2-1 Pinout for Personal Daq/3000 Series Modules …… 2-2 PDQ30 Analog Expansion Option …… 2-3 Connecting for Single-Ended or Differential …… 2-5 3 – CE-Compliance Overview …… 3-1 CE Standards and Directives ……...
Page 6 Using the Hysteresis Function …… 6-8 Using Multiple Inputs to Control One DAC Output …… 6-10 The Setpoint Status Register …… 6-11 7 – Specifications – Personal Daq/3000 Series PDQ30 Appendix A: Signal Modes and System Noise Signal Modes …… A-1 Connecting Thermocouples to Screw-Terminal Blocks ……...
Page 7 Programs group, which can be accessed from the Windows Desktop. You should keep your Personal Daq/3000 Series device model and serial number, as well as any authorization codes (if applicable) with this document. Space is provided below for recording up to 4 model numbers.
Page 8 Channel 1 LO. Notice that Channel 1 LO is the same screw terminal connection that would be used for CH 9 Single-Ended. In Personal Daq/3000 Series and PDQ30 applications, thermocouples should only be connected in differential mode. Connecting thermocouples in single-ended mode can cause noise and false readings.
Page 9: Module
Direct Connection of Personal Daq/3000 and PDQ30 * Do not connect the CA-179-x USB cable until step 2d. Connection of Personal Daq/3000 and PDQ30 via a CA-96 Expansion Cable * Do not connect the CA-179-x USB cable until step 2d.
Page 10: Module
(upon connection of the USB cable) that the unit requires minimal power from th computer’s USB port. Use a A-179-x USB cable to connect the Personal Daq/3000 Series device to a USB port on the comput er. Note that use of a PC with a USB2.0 port is recommended. A USB1.1 port will work, bu will resu lt in lower performance.
Page 11: Module
LEDs Personal Daq/3000 Series modules have 2 LEDs located just right of their USB2 connector. The LEDs function as follows: Power LED: The “Power” LED blinks during device detection and initialization; then remains on solid as long as the module has power. If there is insufficient power the LED will go off and a TR power adapter will be needed.
Page 12 Program group (Use the desktop Start Menu / Programs to access the group). Once the program is executed, software autom atically identifies your Personal Daq/3000 Series device and brings up DaqView’s Main Window. This wi ndow is discussed briefly in the following text, and in more detail in the DaqView Manual PDF included o n the installation CD.
Page 13 2, 3, and 4 are for: bar graph meters, analog meters, and digital meters, respectively. Note that you c simultaneously view combinations of display types. IG-8 Personal Daq/3000 Series Installation Guide 878594...
Page 14: Block Diagrams
Reference Notes: Refer to the DaqView PDF for information regarding that application. Refer to the Personal Daq/3000 Series Users Manual PDF for hardware related information, including pinouts and block diagrams. The default location for PDF documentation is in the Programs group, which can be accessed from the Windows Desktop.
Page 15: Connections
For module details refer to Chapter 7, Specifications. Block Diagrams Block Diagram for Personal Daq/3000 and /3001 Personal Daq/3000 has two 16-Bit Digital-to-Analog Converters. Personal Daq/3001 has four 16-Bit Digital-to-Analog Converters. Personal Daq/3000 Series User’s Manual Device Overviews 1-1 887894...
Page 16 Installation Guide (1136-0940). A copy of the guide is included at the beginning of this manual. USB2.0* Used to connect the Personal Daq/3000 Series device to a host PC [or USB hub] via one of the following cables: CA-179-1, CA-179-3, CA-179-5 (1 m, 3m, and 5m lengths, respectively) External Used to connect the device to an optional TR-2 external power supply when the host PC’s...
Page 17: Product Features
Although the Personal Daq/3000 Series modules are powered via a USB port on a host PC, an external power connector is available for cases in which the host PC’s USB port cannot supply adequate power, or for when the user prefers a separate power source.
Page 18: Software
24 digital I/O lines, counter/timer channels, and analog outputs (when applicable). Analog Input The Personal Daq/3000 series has a 16-bit, 1-MHz A/D coupled with 16 single-ended, or 8 differential analog inputs. Seven software programmable ranges provide inputs from ±10V to ±100 mV full scale.
Page 19 Notice that some of the analog channels in the scan group are from a PDQ30 expansion module. All analog channels are sampled at the same rate of 1us. Analog channels on the PDQ30 can also have any of the gain ranges applied. Personal Daq/3000 Series User’s Manual Device Overviews 1-5 887894...
Page 20 The maximum scan frequency is the inverse of this number, 558 Hz. Channels 0 through 7 of the Personal Daq/3000 can be used to measure temperature in place of voltage. There are three CJC channels per analog input terminal block. When all 8 differential analog inputs are used for temperature 6 CJC channels must be included as part of the scan group.
Page 21 166,666 Hz then the data bandwidth streaming into the PC is 2.167 MSamples per second. Some slower PCs may have a problem with data bandwidths greater than 6 MSamples per second. All Personal Daq/3000 Series devices have an onboard 1 Msample buffer for acquired data. Personal Daq/3000 Series User’s Manual...
Page 22 If the maximum scan frequency is 166,666 Hz then the data bandwidth streaming into the PC is 3 MSamples per second. Some slower PCs may have a problem with data bandwidths greater than 6 MSamples per second. All Personal Daq/3000 Series devices have an onboard 1 Msample buffer for acquired data.
Page 23 USB2.0 versus USB1.1 Connecting a Personal Daq/3000 Series device to a USB1.1 port or hub will result in lower transfer speed which may not support continuous data collection at high scan rates. Note that Hi-Speed (USB2.0) ports are forty times faster than the earlier Full-Speed (USB1.1) versions.
Page 24 However, the Personal Daq/3000 Series circumvents this undesirable situation by use of pre-trigger data. Specifically, when software-based-triggering is employed, and the PC detects that a trigger condition has...
Page 25 Calibration Every range of a Personal Daq/3000 Series device is calibrated at the factory using a digital NIST traceable calibration method. This method works by storing a correction factor for each range on the unit at the time of calibration. The user can adjust the calibration of the board while it is installed in the acquisition system without destroying the factory calibration.
Page 26 Digital outputs can be updated asynchronously at anytime before, during or after an acquisition. Two of the 8-bit ports can also be used to generate a 16-bit digital pattern at up to 4 MHz. The Personal Daq/3000 Series modules support digital pattern generation. In the same manner as analog output, the digital pattern can be read from PC RAM or a file on the hard disk.
Page 27 The data for the DACs and pattern digital output comes from a PC-based buffer. The data is streamed across the USB2 bus to the Personal Daq/3000. It is possible to update the DACs and pattern digital output with the DAC pacer clock (either internally generated or externally applied.) In this case, the acquisition input scans are not synchronized to the...
Page 28 Counter Inputs Each Personal Daq/3000 Series module includes four 32-bit counters; and each of the four counters accepts frequency inputs up to 20 MHz. The high-speed counter channels can be configured on a per-channel basis. Possible configurations include the following modes:...
Page 29 The Daq Configuration control panel allows for interface configuration, testing, and troubleshooting. Each Daq system comes with an Application Programming Interface (API). API-language drivers include C/C++ and Visual Basic. The latest software is a 32-bit version API. Personal Daq/3000 Series User’s Manual Device Overviews 1-15 887894...
Page 30 A copy of the Adobe Acrobat Reader is included on your CD. The Reader provides a means of reading and printing the PDF documents. Note that hardcopy versions of the manuals can be ordered from the factory. 1-16 Device Overviews Personal Daq/3000 Series User’s Manual 887894...
Page 31: Overview
ESD bags and cartons, and related procedures. Overview Personal Daq/3000 Series modules communicate to the host PC via USB cable. Each module has 6 removable blocks to provide convenient screw-terminal connections for all signal I/O. A DSUB25F connector allows for expansion via an optional PDQ30 module, either through direct connection or indirectly via a CA-96 cable.
Page 32: Pinout For Personal Daq/3000 Series Modules
Note 1: Personal Daq/3000 includes DAC0 and DAC1; Personal Daq/3001 includes DAC0, DAC1, DAC2, and DAC3; Personal Daq/3005 has no DACs. Note 2: Personal Daq/3000 Series devices can measure 16 channels of voltage or 8 channels of temperature. Temperature measurement requires the use of differential mode.
Page 33: Pdq30 Analog Expansion Option
48 analog inputs. Refer to PDQ30 specifications sheet for channel input specifications. Personal Daq/3000 Series modules can connect to a PDQ30, directly via DB25 connector or indirectly via a CA-96 cable. When connected directly, i.e., DB25 to DB25, two small clips (included) are used to hold the modules together.
Page 34 Analog Common Note: PDQ30 can measure 48 channels of voltage or 24 channels of temperature. Temperature measurement requires the use of differential mode. Reference Note: For PDQ30 specifications, refer to chapter 7. Connections & Pinouts Personal Daq/3000 Series User’s Manual 888594...
Page 35: Connecting For Single-Ended Or Differential
Connecting thermocouples in single-ended mode can cause noise and false readings. Personal Daq/3000 Series and PDQ30 devices do not have open thermocouple detection. Thermocouple wires are to be connected in differential mode only. Differential connection is made as follows: (a) the red thermocouple wire connects to the channel’s Low (L) connector.
Page 36 Connections & Pinouts Personal Daq/3000 Series User’s Manual 888594...
Page 37: Overview
(overvoltage categories) I, II and III For mains supply, the minimum and normal category is II • pollution degree I or II in accordance with IEC 664 Personal Daq/3000 Series User’s Manual CE-Compliance 898994...
Page 38: Safety Conditions
• In low-level analog applications, some inaccuracy is to be expected when I/O leads are exposed to RF fields or transients over 3 or 10 V/m as noted on the Declaration of Conformity. CE-Compliance Personal Daq/3000 Series User’s Manual 898994...
Page 39 Every range of a Personal Daq/3000 Series device is calibrated at the factory using a digital NIST traceable calibration method. This method works by storing a correction factor for each range on the unit at the time of calibration.
Page 40 Calibration Personal Daq/3000 Series User’s Manual 898194...
Page 41: Tips For Making High-Speed Counter Measurements ( > 1 Mhz )
The two debounce modes are “trigger after stable” and “trigger before stable.” A discussion of the two modes follows. From Terminal Block Connectors Debounce Model Personal Daq/3000 Series User’s Manual Counter Input Modes 887894...
Page 42 T1 it is accepted and the Output (of the debounce module) goes high. Note that a period of stability must precede the edge in order for the edge to be accepted. 5-2 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 43 To see the effects of different debounce time settings, simply view the analog waveform along with the counter output. This can be done by connecting the source to an analog input. Personal Daq/3000 Series User’s Manual Counter Input Modes 887894...
Page 44 The debounce time should be set short enough to accept the desired input pulse but longer than the period of the undesired disturbance as shown in the diagram below. 5-4 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 45: Terms Applicable To Counter Modes
OPT6: Allows the mapped channel to be measured for pulsewidth. Timing Mode (see page 13). OPT2: Determines whether the time is to be measured with a 16-bit counter (Counter Low); or a 32-bit counter (Counter High). Personal Daq/3000 Series User’s Manual Counter Input Modes 887894...
Page 46: Counter/Totalize Mode
The software can read the counter’s high 16-bits at a later time, after reading the lower 16-bits. The full 32-bit result reflects the timing of the first asynchronous read strobe. Counter/Totalize Mode *There is one asynchronous read strobe for each of the four counter channels. 5-6 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 47 Counter and Encoder modes. However, it is possible for the user to use that read strobe as a mapped channel elsewhere, if desired. For example, the read strobe could be used to increment or decrement the counter. Personal Daq/3000 Series User’s Manual Counter Input Modes 887894...
Page 48: Period Mode
208.3 ns, 2083 ns, and 20833 ns. These are often referred to as tick-sizes. The /3000 Series module uses a 48 MHz, 50 ppm oscillator as a timing source. The tick sizes are derived from 1 period, 10 periods, 100 periods, or 1000 periods of the 48 MHz clock. 5-8 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 49 The device has the ability to measure 1, 10, 100 or 1000 periods, dividing the sampling error by 1, 10, 100, or 1000. This is done within the Personal Daq/3000 Series circuitry and may eliminate the need for any averaging to be done in the PC. For high accuracy on high frequency inputs, multiple period measurement and PC-based averaging can be done.
Page 50 15– 50kHz, 1ppm range. The values returned will have sampling error that is greater than 1ppm but they can be averaged by the PC software to further reduce the sampling error. 5-10 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 51: Pulsewidth Mode
208.33 ns, 2.083 µs, and 20.83 µs. These are often referred to as tick-sizes. The 3000 Series module uses a 48 MHz, 50 ppm oscillator as a timing source. If the input signal has a poor slew rate the pulsewidth mode will provide variant results. Personal Daq/3000 Series User’s Manual Counter Input Modes 5-11...
Page 52 Pulsewidth and Timing mode Accuracy Personal Daq/3000 Series modules have the ability to measure the pulsewidth of an input and the time between any two edges on any two inputs. The time ranges are similar to those shown for period mode except that averaging is not available.
Page 53: Timing Mode
Timing Mode *There is one asynchronous read strobe for each of the four counter channels. Note 1: Tick-sizes are: 20.83ns, 208.3ns, 2083ns, and 20833ns, derived from the 48 MHz system clock. Personal Daq/3000 Series User’s Manual Counter Input Modes 5-13...
Page 54 32-bit (Counter High) counter. Since time measurements always have the “stop at the top” option enabled, this option dictates whether the measurement has a range of 0 to 65535 ticks or 0 to 4,294,967,295 ticks. 5-14 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 55: Encoder Mode
When in the encoder mode, the Personal Daq accepts single-ended inputs. When reading phase A, phase B, and index Z signals, the /3000 Series device provides positioning, direction, and velocity data. The Personal Daq/3000 Series module can only receive input from up to two encoders.
Page 56 These 3 different modes are known as 1X, 2X, and 4X. The 3000 Series module implements all of these modes and functions, as described in the following options. Encoder Mode *There is one asynchronous read strobe for each of the four counter channels. 5-16 Counter Input Modes Personal Daq/3000 Series User’s Manual 887894...
Page 57 For single-ended applications, the connections made from the encoder to the 3000 Series device are as follows: • Signals A, B, and Z connect to the Counter Inputs on the Personal Daq/3000 Series device. • Each encoder ground connects to GND.
Page 58 Counter 2 – To Encoder “Z” Encoder Connections to pins on the Personal Daq/3000 The ground depicted at the left is associated with Digital Common on the Personal Daq/3000 Series module. The ground depicted at the right is associated with the external power source.
Page 59 A typical acquisition might take 6 readings off of the Personal Daq/3000 as illustrated below. The user determines the scan rate and the number of scans to take. Personal Daq/3000 Series, Acquisition of Six Readings per Scan Note: Digital channels do not take up analog channel scan time.
Page 60 Counter 3 – To Encoder #2 “B” Two Encoders Connected to Personal Daq/3000 The ground depicted at the left is associated with Digital Common on the Personal Daq/3000 Series module. The ground depicted at the right is associated with the external power source.
Page 61: Overview
The Setpoint Status Register …… 6- 11 Overview Personal Daq/3000 Series modules include a setpoint configuration feature which allows the user to individually configure up to 16 detection setpoints associated with channels within a scan group. Each detection setpoint can be programmed in the following ways: Single Point referenced –...
Page 62 Detection setpoints act on 16-bit data only. Since the Personal Daq/3000 Series modules have 32-bit counters, data is returned 16-bits at a time. The lower word, the higher word or both lower and higher words can be part of the scan group.
Page 63: Detecting Input Values
TIP: It is recommended that the “Equal to Limit A” mode only be used with counter or digital input channels as the channel source. If similar functionality is desired for analog channels, then the “Inside Window” mode should be used. Personal Daq/3000 Series User’s Manual Setpoint Configuration for Output Control 887894...
Page 64: Controlling Analog, Digital, And Timer Outputs
PC may not. This is true no matter what mode the counter channel is in. 6-4 Setpoint Configuration for Output Control Personal Daq/3000 Series User’s Manual 887894...
Page 65 P2C is to be updated by set point criterion, then you must do an asynchronous write to P2C before the acquisition is started. The initial value will only be output if the asynchronous write to P2C has been performed. Personal Daq/3000 Series User’s Manual Setpoint Configuration for Output Control 887894...
Page 66: P2C, Dac, Or Timer Update Latency
DAC pacer clock. For these reasons, avoid streaming outputs on any DAC or pattern digital output when using setpoints to control DACs. 6-6 Setpoint Configuration for Output Control Personal Daq/3000 Series User’s Manual 887894...
Page 67: More Examples Of Control Outputs
DAC1 Detection (for Channel 5) Limit A (for Channel 4) Limit B (for Channel 4) Detection Signal (for Channel 4) Analog Inputs with Setpoints Update on True and False Personal Daq/3000 Series User’s Manual Setpoint Configuration for Output Control 887894...
Page 68: Detection On An Analog Input, Timer Output Updates
(condition False) timer0 will be updated with a second output value. An output value of 65535 will stop the timer. Limit A (for Channel 23) Limit B (for Channel 23) Detection Signal Timer0 Updating a Timer Output Update on True and False 6-8 Setpoint Configuration for Output Control Personal Daq/3000 Series User’s Manual 887894...
Page 69 Hysteresis mode can also be done with P2C digital output port, or a timer output, instead of a DAC. Ch 3 Analog Input Voltage Limit A Limit B Detection DAC0 Channel 3 in Hysterisis Mode Personal Daq/3000 Series User’s Manual Setpoint Configuration for Output Control 887894...
Page 70: Using Multiple Inputs To Control One Dac Output
When both channel criteria [from the scan] are True, then the DAC2 voltage will be associated with the one most recently met. 6-10 Setpoint Configuration for Output Control Personal Daq/3000 Series User’s Manual 887894...
Page 71: The Setpoint Status Register
The Setpoint Status Register Regardless of which software application you are using with a Personal Daq/3000 Series device, a setpoint status register can be used to check the current state of the 16 possible setpoints. In the register, Setpoint 0 is the least significant bit and Setpoint 15 is the most significant bit.
Page 72 6-12 Setpoint Configuration for Output Control Personal Daq/3000 Series User’s Manual 887894...
Page 73: General Specifications
/3005 & PDQ30 2400 mW The power consumption listed is for a single Personal Daq/3000 Series device, or for a single device connected to a PDQ30 expansion module. An optional power adapter (TR-2) will be required if the USB port cannot supply adequate power. USB2 ports are, by USB2 standards, required to supply 2500 mW (nominal at 5V, 500 mA).
Page 74 Analog Inputs Channels: 16 single-ended or 8 differential. Programmable on a per-channel basis as single-ended or differential. Expansion: An additional 48 analog inputs per module via optional PDQ30 module. Expansion channel features are identical to those of the main channels. Expansion Connector: 25-pin DSUB, female Over-Voltage Protection: ±30V without damage Voltage Measurement Speed: 1 µs per channel...
Page 75 Worst Case Temperature Measuerment Error vs. Personal Daq3000 Ambient Temperature with Thermocouple at 0ºC (Excludes Thermocouple Error); AutoZero Disabled; Selected Thermocouple Types: T, J, K, and E Ambient Temperature (ºC) Worst Case Temperature Measuerment Error vs. PDaq3000 Ambient Temperature with Thermocouple at 0ºC (Excludes Thermocouple Error); AutoZero Enabled;...
Page 76 Accuracy Temperature Coefficient Noise** (cts RMS) ±(% Reading + % Range) ± (ppm of Reading + ppm Range)/ºC Voltage Range* 23ºC ± 10°C, 1 year -30ºC to 13°C and 33ºC to 70ºC -10V 0.031% + 0.008% 14 + 8 0.031% + 0.009% 14 + 9 0.031% + 0.010% 14 + 10...
Page 77 Per-Channel Error, External Power °C -0.5 -1.0 -1.5 Channel Per-Channel Error, USB Power °C -0.5 -1.0 -1.5 -2.0 -2.5 Channel Typical Performance of 8 Personal Daq/3001 Modules. Assumes 16384 oversampling applied, CMV = 0.0V, 60 minute warm-up, still environment, and 25°C ambient temperature; excludes thermocouple error; = 0°C Note: Specifications are subject to change without notice.
Page 78 A/D Specifications Type: Successive approximation Resolution: 16 bit Maximum Sample Rate: 1 MHz Nonlinearity (Integral): ±2 LSB maximum Nonlinearity (Differential): ±1 LSB maximum Input Sequencer Analog, digital, and counter inputs can be scanned synchronously based on either an internal programmable timer, or an external clock source.
Page 79 Triggering Trigger Sources: 7, individually selectable for starting and stopping an acquisition. Stop acquisition can occur on a different channel than start acquisition; stop acquisition can be triggered via modes 2, 4, 5, or 6 described below. 1. Single-Channel Analog Hardware Trigger: Any analog input channel can be software programmed as the analog trigger channel, including any of the analog expansion channels.
Page 80 Analog output channels are updated synchronously relative to scanned inputs, and clocked from either a Personal Daq/3000 Series internal clock, or an external clock source. Analog outputs can also be updated asynchronously, independent of any other scanning in the system. Streaming from disk or memory is supported, allowing continuous waveform outputs (limited only by available PC system resources).
Page 81 Pattern Generation Output Two of the 8-bit ports can be configured for 16-bit pattern generation. The pattern can be updated synchronously with an acquisition at up to 4 MHz. Counters One Counter Channel, Typical Each of the four high-speed, 32-bit counter channels can be configured for counter, period, pulse width, time between edges, or multi-axis quadrature encoder modes.
Page 82 Frequency/Pulse Generators One Timer Channel, Typical Channels: 2 x 16-bit Output Waveform: Square wave Output Rate: 1 MHz base rate divided by 1 to 65535 (programmable) High Level Output Voltage: 2.0V minimum @ -1.0 mA, 2.9V minimum @ -400 µA Low Level Output Voltage: 0.4V maximum @ 400 µA Software DaqView add-on for seamless execution with Microsoft Excel’s tool palette...
Page 83 General Operating Temperature: -30˚ to +70˚C Storage Temperature: -40˚ to +80˚C Power: Supplied by DaqBoard/3000 Series or Personal Daq/3000 Series; 400 mW (max) Relative Humidity: 0 to 95%, non-condensing Vibration: MIL STD 810E, category 1 and 10 Communications Connector: 25 pin DSUB Signal I/O Connector: Six removable screw-terminal blocks (12 connections each) Dimensions: 269mm W x 92mm D x 45 mm H: (10.6”...
Page 84 PDQ12 PDQ30 Adds 48 SE [or 24 DE] channels to a Personal Daq/3000 Series module. Characteristics of the expansion channels are identical to those of the main channels. PDQ30 can connect directly to a 3000 Series module’s DB25 connector, or connect via a CA-96 cable.
Page 85: Signal Modes
Oversampling and Line Cycle Rejection …… A-6 Signal Modes Personal Daq/3000 units can make use of single-ended mode, or differential modes. Mode selection is made in software. Single-ended mode refers to a mode, or circuit set-up, in which a voltage is measured between 1 signal line and common ground voltage (Analog Common, or A ).
Page 86: Connecting Thermocouples To Screw-Terminal Blocks
Connecting Thermocouples to Screw Terminal Blocks Personal Daq/3000 Series modules can measure 16 channels of voltage in Single-Ended mode or 8 channels of temperature in differential mode. You could, instead, mix signal types, for example have 6 thermocouples and 4 voltage channels connected. This combination would occupy the 16 analog signal screw-terminals.
Page 87: Shielding
Using shielded TC wire with the shield connected to analog common will result in further noise reduction. Personal Daq/3000 Series modules have one analog common screw-terminal connection for every 2 analog SE channel connections. You can connect the shield of a shielded thermocouple to one of the analog common terminals.
Page 88: Cold Junction Compensation Techniques
Cold Junction Compensation Techniques The Personal Daq/3000 can measure up to 8 channels of temperature, the PDQ30 can measure up to 24 channels of temperature. Both units employ thermistors to measure the junction temperature (at the terminal block) for each thermocouple connection.
Page 89: System Noise
System Noise Laboratory and industrial environments often have multiple sources of electrical noise. An AC power line is a source of 50/60 Hz noise. Heavy equipment (air conditioners, elevators, pumps, etc.) can be a source of noise, particularly when turned on and off. Local radio stations are a source of high-frequency noise, and computers and other electronic equipment can create noise in a multitude of frequency ranges.
Page 90: Crosstalk
This use of a buffer also stops transient signals from propagating backwards from the multiplexer to the transducer. Personal Daq/3000 and PDQ30 systems do not have a buffer for each analog input channel, due to power restrictions. Crosstalk is particularly troublesome when measuring high amplitude signals (+/-10V) along with low level signals (+/- 100mV.) All temperature measurements are low level signals that use the +/-...
Page 91 Glossary Acquisition A collection of scans acquired at a specified rate as controlled by the sequencer. Analog A signal of varying voltage or current that communicates data. Analog-to-Digital A circuit or device that converts analog values into digital values, such as binary bits, for use in Converter (ADC) digital computer processing.
Page 92 Differential mode Differential mode voltage refers to a voltage difference between two signals that are referenced voltage to a common point. Example: Signal 1 is +5 VDC referenced to common. Signal 2 is +6 VDC referenced to common. If the +5 VDC signal is used as the reference, the differential mode voltage is +1 VDC (+ 6 VDC - +5 VDC = +1 VDC).

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