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Measurement Computing WLS-TC Скачать руководство пользователя страница 16

WLS-TC User's Guide 

Functional Details 

16 

To reduce the error, reduce the length of the thermocouple to lower its resistance, or lower the AWG of the wire 
by using a wire with a larger diameter. With OTD disabled, a maximum of 30 nA of input leakage current is 
injected into the thermocouple. 

AC power supply 

The external power supply is an AC-to-USB 2.5 W supply that is used to power the WLS-TC during remote 
wireless operations (MCC p/n 

USB Power Adapter

.) 

External components 

The WLS-TC has the following external components, as shown in Figure 5. 

 

Screw terminals 

 

USB connector 

 

Status LEDs (Command, Wireless Power, Transmit, Receive, Received Signal Strength indicators) 

 

LED Test button 

 

1 

Screw terminal pins 1 to 26 

6 

Receive LED 

2 

Screw terminal pins 27 to 52 

7 

Transmit LED 

3 

Command LED 

8 

Wireless Power LED 

4 

LED Test button 

9 

USB connector 

5 

Received Signal Strength (RSS) LEDs 

 

 

Figure 5. WLS-TC component locations 

Screw terminals 

The device's four banks of screw terminals are for connecting thermocouples and digital I/O lines. These 
terminals also provide ground and power output connections. Refer to the "

Screw terminal pin out

 " section on 

page 12 for screw terminal descriptions. 

Caution!

 

The two 

+5V 

terminals (pin 21 and pin 47) are isolated (500 VDC) from the USB +5V. Each +5V 

terminal is an output. Do not connect to an external power supply or you may damage the WLS-
TC and possibly the computer. 

Содержание WLS-TC

Страница 1: ...WLS TC Wireless Thermocouple Measurement User s Guide Document Revision 4A April 2014 Copyright 2014 ...

Страница 2: ...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 devic...

Страница 3: ...ocouple type 9 Network parameters remote operation 10 Connecting the external power supply for remote operation 11 Calibrating the WLS TC 11 Warm up time 11 Chapter 3 Sensor Connections 12 Screw terminal pinout 12 Thermocouple inputs 12 CJC sensors 12 Digital I O 13 Power outputs 13 Ground 13 Thermocouple connections 13 Wiring configuration 13 Digital I O connections 14 Configuring the DIO channel...

Страница 4: ...ement accuracy 19 Throughput rate to PC USB or wireless 19 Digital input output 20 Temperature alarms 20 Memory 20 Microcontroller 21 Wireless communications 21 USB 5V voltage 21 Power 22 USB specifications 22 Environmental 22 Mechanical 23 LED button configuration 23 Screw terminal connector 24 Declaration of Conformity 25 ...

Страница 5: ...aging 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 WLS TC hardware is available on our website at www mccdaq com You can also cont...

Страница 6: ...ive high or low You set up the temperature threshold conditions to activate each alarm When an alarm is activated the associated DIO channel is driven to the output state All configurable options are software programmable The WLS TC is fully software calibrated You can operate the WLS TC as a standalone plug and play device which draws power through the USB cable You can also operate the WLS TC as...

Страница 7: ...WLS TC User s Guide Introducing the WLS TC 7 WLS TC block diagram WLS TC functions are illustrated in the block diagram shown here Figure 1 WLS TC functional block diagram ...

Страница 8: ...o eliminate any stored static charge If any components are missing or damaged contact us immediately using one of the following methods Knowledgebase kb mccdaq com Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com For international customers contact your local distributor Refer to the Internationa...

Страница 9: ...appears when the wizard completes the installation 4 Click on the Finish button to exit the wizard A dialog box opens when the hardware is installed and ready to use The Command LED will blink and then remain on to indicate that communication is established between the WLS TC and your computer The Wireless Power LED turns on to indicate that the internal RF module is receiving power If the Command...

Страница 10: ...ansmission Frequency GHz 12 2 410 18 2 440 13 2 415 19 2 445 14 2 420 20 2 450 15 2 425 21 2 455 16 2 430 22 2 460 17 2 435 23 2 465 AES Key Value used to encrypt data optional AES encryption is disabled by default Unless you suspect that there are other users of WLS Series devices in the area there should be no need to enable encryption However if you suspect that there are other WLS Series devic...

Страница 11: ...l during device operation To ensure compliance operation at closer than this distance is not recommended The antenna used for this transmitter must not be co located in conjunction with any other antenna or transmitter Calibrating the WLS TC You can fully calibrate the WLS TC using InstaCal Allow a 30 minute warm up before calibrating The normal calibration interval is once per year You can calibr...

Страница 12: ...nals are identified in Figure 2 Figure 2 WLS TC screw terminal pin numbers Use 16 AWG to 30 AWG wire for your signal connections Tighten screw terminal connections When making screw terminal connections be sure to tighten the screw until tight Simply touching the top of the screw terminal is not sufficient to make a proper connection Thermocouple inputs You can connect up to eight thermocouples to...

Страница 13: ...put Use InstaCal to select the thermocouple type J K R S T N E and B and one or more sensor input channels to connect the thermocouple Wiring configuration Connect the thermocouple to the WLS TC using a differential configuration as shown in Figure 3 Figure 3 Typical thermocouple connection Connect thermocouples to the WLS TC so that they float with respect to GND pins 9 19 28 38 The WLS TC GND pi...

Страница 14: ...ground For general information regarding digital signal connections and digital I O techniques refer to the Guide to Signal Connections available on our web site at www mccdaq com signals signals pdf Configuring the DIO channels to generate alarms The WLS TC features eight independent temperature alarms All alarm options are software configurable Remote alarm configuration is supported When a digi...

Страница 15: ...ts for the additional thermocouples created at the terminal blocks by subtracting the calculated cold junction voltage from the analog input s thermocouple voltage measurement Increasing the thermocouple length If you need to increase the length of your thermocouple use the same type of thermocouple wires to minimize the error introduced by thermal EMFs Data linearization After the CJC correction ...

Страница 16: ... Wireless Power Transmit Receive Received Signal Strength indicators LED Test button 1 Screw terminal pins 1 to 26 6 Receive LED 2 Screw terminal pins 27 to 52 7 Transmit LED 3 Command LED 8 Wireless Power LED 4 LED Test button 9 USB connector 5 Received Signal Strength RSS LEDs Figure 5 WLS TC component locations Screw terminals The device s four banks of screw terminals are for connecting thermo...

Страница 17: ...g a wireless message and stay on for approximately 1 second after the end of the message They indicate the amount of fade margin present in an active wireless link Fade margin is defined as the difference between the incoming signal strength and the device s receiver sensitivity Three LEDs on Very strong signal 30 dB fade margin Two LEDs on Strong signal 20 dB fade margin One LED on Moderate signa...

Страница 18: ...rejection ratio fIN 60 Hz 90 dB min Common mode rejection ratio fIN 50 Hz 60 Hz 100 dB min Resolution 24 bits No missing codes 24 bits Input coupling DC Warm up time 30 minutes min Open thermocouple detect Automatically enabled when the channel pair is configured for thermocouple sensors The maximum open detection time is 3 seconds CJC sensor accuracy 15 C to 35 C 0 25 C typ 0 5 C max 0 C to 70 C ...

Страница 19: ...Errors shown do not include inherent thermocouple error Please contact your thermocouple supplier for details on the actual thermocouple error Note 4 Thermocouples must be connected to the device such that they are floating with respect to GND pins 9 19 28 38 The device GND pins are isolated from earth ground so connecting thermocouple sensors to voltages referenced to earth ground is permissible ...

Страница 20: ...ications Parameter Specification Number of alarms 8 one per digital I O line Alarm functionality Each alarm controls its associated digital I O line as an alarm output The input to each alarm may be any of the analog temperature input channels When an alarm is enabled its associated I O line is set to output after the device is reset and driven to the appropriate state determined by the alarm opti...

Страница 21: ... AES software selectable Note 8 Contains FCC ID OUR XBEEPRO The enclosed device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions i this device may not cause harmful interference and ii this device must accept any interference received including interference that may cause undesired operation Note 9 Canada Contains Model XBee Radio IC 4214A XBEEPRO Caution...

Страница 22: ...ly Self powered hubs allow a connected USB device to draw up to 500 mA This device may not be used with bus powered hubs due to the power supply requirements Root Port Hubs reside in the PC s USB Host Controller The USB port s on your PC are root port hubs All externally powered root port hubs desktop PC s provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 ...

Страница 23: ...end of the message These LEDs indicate the amount of fade margin present in an active wireless link Fade margin is defined as the difference between the incoming signal strength and the device s receiver sensitivity 3 LEDs on Very strong signal 30 dB fade margin 2 LEDs on Strong signal 20 dB fade margin 1 LED on Moderate signal 10 dB fade margin 0 LEDs on Weak signal 10 dB fade margin Wireless Pow...

Страница 24: ...6H CH6 sensor input 9 GND Ground 35 NC No connection 10 RSVD Reserved do not use 36 RSVD Reserved do not use CJC sensor CJC sensor 11 RSVD Reserved do not use 37 RSVD Reserved do not use 12 NC No connection 38 GND Ground 13 C2H CH2 sensor input 39 C5L CH5 sensor input 14 C2L CH2 sensor input 40 C5H CH5 sensor input 15 NC No connection 41 RSVD Reserved do not use 16 RSVD Reserved do not use 42 NC N...

Страница 25: ...ite suppressor assembly required IEC 61000 3 2 2001 Harmonic Emissions Class A IEC 61000 3 3 2003 Fluctuations and Flicker Immunity IEC 61000 4 2 2001 Electrostatic Discharge immunity Criteria C IEC 61000 4 3 2002 Radiated Electromagnetic Field immunity Criteria A IEC 61000 4 4 2004 Electric fast transient burst immunity Criteria B IEC 61000 4 5 Fast surge immunity Criteria B IEC 61000 4 6 2003 Ra...

Страница 26: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com ...

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