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Model 7708 M ultiplexer M odule Instructions for use w ith DAQ6510 077144500 / April 2018 23 RTD temperature To verify the RTD temp erature: 1. Connect the precisi on decade resista nce box to the CH1 an d CH11 H an d L …

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Model 7708 Multiplexer Module Instructions for use with DAQ6510
22 077144500 / April 2018
2. Install the module in Slot 1 of the DAQ6510.
3. Turn on the power.
4. Allow the instrument to warm up for one hour.
5. Make sure that the front-panel TERMINALS switch is set to REAR.
6. On the front panel of the instrument, select the FUNCTION key and then select Temperature.
7. On the Home screen, swipe to the CHANNEL swipe screen.
8. Close channel 101.
9. Set the channel to temperature.
10. Configure the channel for °C units, thermocouple, and internal reference junction as follows:
a. Press the MENU key.
b. Select Channel Settings.
c. Set the Transducer to TC.
d. Set the Thermocouple to K or J.
e. Set the Unit to Celsius.
f. Set the Reference Junction to Internal.
11. Source each of the voltages in the table below based on the type of thermocouple used. Verify that the
temperature readings are within limits.
12. Return to the CHANNEL swipe screen and open Channel 1.
Based on the type of thermocouple used, verify your data against the specifications in the following table.
Thermocouple type
Applied DC voltage*
Reading limits (1 year, 18 °C to 28 °C)
J
-7.659 mV
-192.33 °C to -187.67 °C
0 mV
-1.0 °C to +1.0 °C
42.280 mV
749.0 °C to 751.0 °C
K
-5.730 mV
-192.33 °C to -187.67 °C
0 mV
-1.0 °C to +1.0 °C
54.138 mV
1349.0 °C to 1351.0 °C
*Voltages shown are based on the ITS-90 standard.
Model 7708 Multiplexer Module Instructions for use with DAQ6510
077144500 / April 2018 23
RTD temperature
To verify the RTD temperature:
1. Connect the precision decade resistance box to the CH1 and CH11 H and L terminals of the module using
four-wire connections. Refer to the first figure in Verifying resistance for connections.
2. Install the module in Slot 1 of the DAQ6510.
3. Turn on the power.
4. Allow the instrument to warm up for one hour.
5. Make sure that the front-panel TERMINALS switch is set to REAR.
6. On the front panel of the instrument, select the FUNCTION key and then select Temperature.
7. On the Home screen, swipe to the CHANNEL swipe screen.
8. Close channel 101.
9. Set the channel to Temperature.
10. Configure the channel for °C units and RTD temperature sensor as follows:
a. Press the MENU key.
b. Select Channel Settings.
c. Set Transducer to 4-Wire RTD.
d. Set 4-Wire RTD to PT385.
11. Source each of the voltages in the table below to verify that the temperature readings are within limits.
Make sure to select the appropriate thermocouple type for each group of readings.
12. Set the decade resistance box to each of the values shown in the table below. Verify that the temperature
readings are within the required limits.
13. Return to the CHANNEL swipe screen, and open Channel 1.
Applied resistance*
Reading limits (1 year, 18 °C to 28 °C)
22.80 Ω
-190.06 °C to -189.94 °C
100.00 Ω
-0.06 °C to +0.06 °C
313.59 Ω
599.94 °C to 600.06 °C
*Based on = 0.00385
Model 7708 Multiplexer Module Instructions for use with DAQ6510
24 077144500 / April 2018
Verifying frequency
To verify the module frequency:
1. Connect the function generator to the CH1 H and L INPUT terminals of the module. Refer to the next figure
for more information.
2. Install the module in Slot 1 of the DAQ6510.
3. Turn on the power.
4. Allow the instrument to warm up for one hour.
5. Make sure that the front-panel TERMINALS switch is set to REAR.
6. Set the function generator to output a 1 kHz 1 V
RMS
sine wave.
7. On the front panel of the instrument, select the FUNCTION key and then select Frequency.
8. On the Home screen, swipe to the CHANNEL swipe screen.
9. Close channel 101.
10. Verify that the DAQ6510 frequency reading is between 0.9999 kHz and 1.0001 kHz.