PASCO TD-8565, Instruction Manual And Experiment Manual

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012-05110C Adiabatic Gas Law Apparatus
5
Setup
Connecting the Voltage Supply
Install a nine volt battery (not included) in the battery
compartment located on the front of the electronics
box, OR, connect a "floating ground" external voltage
source to the jacks on the front of the electronics box.
The external power supply must provide a stable DC
voltage source of no more than 15 volts. Set the
indicator switch on the front of the electronics box to
"ON" for battery, or "ON" for an external power
supply, depending on which voltage supply you are
using. If you are using a battery, be sure to switch it
off when you are not using the apparatus.
Connecting the Signal Cables
Connect one of the DIN-plug-to-mini-phone-plug
cables to the output jack for the temperature sensor
(located on the back of the electronics box). Connect
the other cable to the pressure sensor output jack. The
signal cable for the volume sensor (the linear potential
divider) is permanently attached to the base of the
cylinder.
➤ CAUTION : DIN connectors on the cables
provided are wired for use with the PASCO
Series 6500 Computer Interface, the Mac65
interface or the MPLI from Vernier Software.
(The pin configuration is shown elsewhere in this
manual. ) If you are using a different interface,
check the pin configuration on the inputs and
make any needed changes before connecting.
CONNECTING A VOLTAGE SOURCE TO
THE OUTPUT JACKS MAY DAMAGE THE
AMPLIFIERS.
Other Setup
Place the piston excursion limit pins in the position
selected to provide the compression ratio desired.
Maximum compression ratio may not give best results.
Using the TD-8565 with the PASCO Series
6500 Computer Interface
IBM compatible computers
➀ Connect the plug of the volume cable into Analog
Channel A of the Series 6500. Use the adapter
cables supplied with the apparatus to connect the
temperature and pressure sensors to Channels B and
C respectively.
➁ Start the Data Monitor program. An ideal operating
mode for learning about the apparatus is the three
channel "L–Oscilloscope" mode. Set the sweep
speed to 20 milliseconds per division and the sensi-
tivity of each channel to 1.00 volts per division.
Move the piston up and down to determine that the
system is operating properly. Make any necessary
adjustments to the sweep speed and sensitivity.
➂ To facilitate setting the triggering level, return to
the Main Menu and select "M–Monitor Input".
This will allow you to observe the three input volt-
ages. For compressions, the temperature signal
should range from 0.1 volts to +3 volts and for ex-
pansion from 0 volts to about -2 volts. The pres-
sure signal should range from 0 volts to +3 volts for
compression and expansion. The volume signal
should range from +5 volts at highest value to 0
volts.
Return to the Main Menu and choose option “Z–
Calibration". In the calibration menu, choose “Z”
again to calibrate each input, then select the input
you wish to calibrate. Follow the directions given
on the screen.
A: Volume: Hold the piston at the highest position
(
≈
15.5 cm) and press enter when the reading has
stabilized. Enter the actual volume correspond-
ing to that reading. (Calculate it based on the
position and the radius of the cylinder.) Now put
the piston on the lowest position and enter an-
other calibration point.
B: Temperature: Use the calibration equation pro-
vided with your unit to calculate the temperature
corresponding to the voltage for the first calibra-
tion point. Pressurize the system and quickly
press <Enter> to get a higher reading, then use
the calibration equation again to get the second
point.
➃