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BNC/TC-2095 Rack-Mount Adapter Installation Guide

10

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Table 2.  

BNC/TC-2095 Shield Ground Jumper Configuration

Jumper W2 Configuration

Description

When to Use a Setting

100 

 (factory-default)— 

Connects the 
BNC/TC-2095 housing 
to SCXI chassis ground 
through a 100 

Ω 

resistor, 

while minimizing any 
potential ground loop 
current.

Use this setting when you are using 
the SH96-96 cable, and if one of the 
following is true:

• You have not rack-mounted the 

BNC/TC-2095.

• You have rack-mounted the 

BNC/TC-2095, but are unsure 
whether the rack and the 
BNC/TC-2095 are grounded.

—Connects the 

BNC/TC-2095 housing to 
SCXI chassis ground.

Use this setting only if the 
factory-default setting is inadequate 
for noise rejection, you are using the 
R9696 cable, and if one of the 
following is true:

• You have not rack-mounted the 

BNC/TC-2095.

• You have rack-mounted the 

BNC/TC-2095 and are sure that 
the rack and the BNC/TC-2095 
are not grounded.

Open—Disconnects the 
BNC/TC-2095 metal 
housing from SCXI 
chassis ground.

Use this setting only if all of the 
following are true:

• Factory-default setting was 

inadequate for noise rejection.

• You are using either the SH96-96 

cable or the R9696 cable.

• You have rack-mounted the 

BNC/TC-2095.

• You are sure that the rack and the 

BNC/TC-2095 are grounded.

100 

OPEN

4321

W2

100 

OPEN

4321

W2

100 

OPEN

4321

W2

Summary of Contents for TC-2095

Page 1: ...able or an R9696 ribbon cable Rack mount construction for use with 19 in racks A shielded metal enclosure to minimize noise The TC 2095 also features isothermal construction to minimize the temperature gradients across the thermocouple junctions and a high accuracy thermistor for cold junction temperature sensing The BNC 2095 and the TC 2095 have pull up resistors connected between CH and 5 VDC an...

Page 2: ...symbol is marked on the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury bo...

Page 3: ...I chassis and documentation One of the following SCXI modules and its documentation SCXI 1100 SCXI 1102 B C SCXI 1104 C SCXI 1581 One of the following cable assemblies SH96 96 cable assembly recommended R9696 cable assembly TBX cable adapter included in cable assembly kit Number 1 Phillips screwdriver 1 8 in flathead screwdriver Long nose pliers Connecting Signals Caution Refer to the Read Me Firs...

Page 4: ...rning the cable connector clockwise TC 2095 The TC 2095 has 32 universal thermocouple miniconnectors that you can use to connect a thermocouple to each channel of the SCXI module Each connector is labeled with the corresponding channel number The miniconnector indicates the positive and negative terminals Caution Do not force the miniconnector into the socket If you have difficulty inserting the m...

Page 5: ...this setting for detecting floating signals or open signal leads When detecting open signal leads the positive input is pulled to 5 VDC if the measured signal is 5 VDC Only use this setting or configuration with signals between 5 VDC TC 2095 Use thissetting to detect open thermocouples and when the thermocouple is floating Ground referenced signal or thermocouple No BNC 2095 or TC 2095 Use thisset...

Page 6: ...TC 2095 Use thissetting when the signal or thermocouple is floating and you want to disable open thermocouple detection Ground referenced thermocouple or signal Yes BNC 2095 Use this setting for detecting ground referenced signals or open signal leads When detecting open signal leads the positive input is pulled to 5 VDC if the measured signal is 5 VDC Only use this setting or configuration with s...

Page 7: ...X cable adapter to the SCXI module and secure the adapter by tightening both thumbscrews 4 Connect either end of the SH96 96 cable to the TBX cable adapter and SCXI module and secure the cable by tightening both backshell mounting screws Figure 1 Connecting the SH96 96 Cable to the SCXI Module 5 Mount the BNC TC 2095 onto a 19 in rack or place it on a workbench near the SCXI chassis If you do not ...

Page 8: ... BNC TC 2095 Connected to SCXI Module Configuring the BNC TC 2095 To access jumpers W1 and W2 and the resistor networks refer to Figure 3 as you complete the following steps 1 Remove the nine cover screws that secure the BNC TC 2095 cover 2 Remove the cover 3 Set jumpers W1 and W2 as needed For more information about setting the jumpers refer to the Configuring the Shield Ground Jumper and Configu...

Page 9: ...Jumper W2 connects the metal case and shield to the analog ground of the SCXI module directly or through a 100 Ω resistor The factory default setting is through the 100 Ω resistor Refer to Table 2 for configuration options for jumper W2 1 Cover 2 Cover Screws 9 3 RP1 4 RP5 5 RP2 6 RP5 7 W1 8 W2 9 RP3 10 RP7 11 RP4 12 RP8 13 Switches 12 11 10 9 8 7 6 5 4 3 13 2 1 ...

Page 10: ...nnects the BNC TC 2095 housing to SCXI chassis ground Use this setting only if the factory default setting is inadequate for noise rejection you are using the R9696 cable and if one of the following is true You have not rack mounted the BNC TC 2095 You have rack mounted the BNC TC 2095 and are sure that the rack and the BNC TC 2095 are not grounded Open Disconnects the BNC TC 2095 metal housing fr...

Page 11: ... 0 to 55 C temperature range Table 4 shows the temperature sensor output accuracy To select and read the temperature sensor refer to the driver software documentation for programming information Table 3 Jumper W1 Settings for the TC 2095 Jumper W1 Position Description MTEMP CJTEMP mode Factory default setting Do not change the jumper position Table 4 Temperature Sensor Voltage Output Accuracy Temp...

Page 12: ... a filter on the VTEMPOUT signal Therefore use an average of a large number of samples to obtain an accurate measurement For example sample for one second and average Noisy environments require more samples for greater accuracy The SCXI 1102 B C has a 2 Hz filter on the VTEMPOUT signal input channel 2 Calculate the cold junction temperature in Kelvin a 1 295361 10 3 b 2 343159 10 4 c 1 018703 10 7...

Page 13: ...r networks included in the BNC TC 2095 kit You can install these resistor networks as RP1 RP2 RP3 and RP4 Refer to Figure 3 for the locations of RP 1 8 If you use this configuration and you have the ground referencing switch powered on the thermocouples or signals with low impedance sources less than 100 Ω either float without affecting the measurement or are ground referenced Figure 5 shows how t...

Page 14: ...g Channels with open thermocouples saturate at all sample rates Use long nose pliers to remove or replace the resistor networks in the sockets Be careful not to damage the network package Make sure pin 1 of each network is in the correct socket Refer to Figures 6 and 7 as needed Table 5 Channel Input Signals and Resistor Network Channel Pull Up Resistor Network Ground Referencing Resistor Network ...

Page 15: ...ampling rate of the module The open thermocouple channel may not saturate if the interchannel delay is less than 200 µs or if the sample rate is more than 5 kHz at a gain of 100 or higher If you want fast open thermocouple detection and you have short thermocouple leads or if high accuracy is not important you can replace the pull up resistors with a lower value resistor network For example you ca...

Page 16: ... use the 10 Ω ground referencing resistor networks which brings the common mode voltage down to nearly 0 VDC Current Leakage The open thermocouple detection circuitry results in a small current leakage into the thermocouple With the 10 MΩ bias and pull up resistor networks the current leakage results in a negligible error With the 10 Ω bias resistor the 10 MΩ pull up resistor connected to 5 VDC ca...

Page 17: ...ical Dimensions 48 3 cm by 4 4 cm by 19 0 cm 19 0 in by 1 7 in by 7 7 in Maximum Working Voltage Maximum working voltage signal common mode Each input should remain within 10 VDC of chassis ground Environmental Operating temperature 0 to 50 C Storage temperature 20 to 70 C Humidity 10 to 90 RH noncondensing Maximum altitude 2 000 m Pollution Degree indoor use only 2 1 Includes the combined effects...

Page 18: ...ssions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity EN 61326 1997 A2 2001 Table 1 EMC EMI CE C Tick and FCC Part 15 Class A Compliant Note For EMC compliance you must operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electro...

Page 19: ...tioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 1999 2003 National Instruments Corp All rights reserved 321731B 01 Oct03 321731B 01 ...

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