Lakeshore 336, Руководство пользователя, Страница: 67 / 192

4.4.7 Capacitance Sensor Input Setup (Model 3061 Only) 55
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For best results, the calibration temperature should be close to the measurement tem-
perature that requires best accuracy.
1. Attach a thermocouple sensor or direct short across the input terminals of the
thermocouple input. See FIGURE 3-8 for polarity.
2. Place the instrument away from drafts. If calibrating using a short, place an accu-
rate room-temperature thermometer near the terminal block.
3. Allow the instrument to warm up for at least ½ hr without moving or handling
the sensor.
4. If calibrating with a short, skip to step 6, otherwise insert the thermocouple into
the ice-bath, liquid nitrogen, helium Dewar, or other known, fixed temperature.
5. Read the displayed temperature. If the temperature display is not as expected,
check to be sure that the thermocouple is making good thermal contact. If possi-
ble, add a thermal mass to the end of the thermocouple.
6. Press Input Setup and select the corresponding sensor input. Scroll down to the
Room Calibration parameter and press Enter .
7. The current temperature reading is displayed in kelvin. Press Enter to enter Num-
ber Entry mode. Enter the true temperature that the thermocouple should read.
If input is shorted, then enter the actual room temperature measured by the
thermometer. Press
Enter to save the value.
8. To verify calibration, check that the temperature reading for the calibrated input
matches the room temperature calibration setting value.
Any previous calibration can be cleared using the Clear Calibration submenu.
Menu Navigation:
Input Setup
Q
Room Calibration
Q
Clear Calibration
Default: Room calibration cleared
4.4.7 Capacitance
Sensor Input Setup
(Model 3061 Only) When a Model 3061 capacitance option is installed in the Model 336, a setting of
Capacitance becomes available under the Sensor Type parameter in the Input Setup
menu. The standard sensor inputs can still be used when the capacitance option is
installed, but the capacitance and standard inputs cannot be used simultaneously.
Refer to section 7.6.1 to install the Model 3061.
Capacitive sensors in the Model 336 do not support temperature conversion; there-
fore temperature response curves cannot be selected. Any feature of the Model 336
that requires temperature to operate is not supported with the option card. Refer to
section 3.6 for more information on using the Model 3061.
4.4.7.1 Range Selection
The capacitance option input has two input voltage ranges, 15 nF and 150 nF. The
lower range is specified to 15 nF, but can read up to 25 nF, and is recommended for
CS-401 series sensors. The higher range is specified to 150 nF, but can read up to
250 nF, and is recommended for CS-510 series sensors.
Menu Navigation:
Input Setup
Q
Input (D)
Q
Sensor Type
Q
Capacitance
Interface Command:
INTYPE