Keithley 2700 Service Manual page 32

1-16 Performance Verification
4.
Table 1-7
Thermocouple temperature verification reading limits
Thermocouple type
* Voltages shown are based on ITS-90 standard using 0°C reference junction temperature. See text for pro-
cedure to set reference junction temperature.
RTD temperature
1.
2.
3.
Source each of the voltages summarized in
readings are within limits. Be sure to select the appropriate thermocouple type for each
group of readings. (See step 2 above.)
Applied DC voltage* Reading limits (1 year, 18°C to 28°C)
J -7.659mV
0mV
42.280mV
K -5.730mV
0mV
54.138mV
Connect the precision decade resistance box (listed in
INPUT and SENSE jacks using four-wire connections. (See
necting scheme.) Be sure the INPUTS switch is in the FRONT position.
Configure the Model 2700 temperature function for ˚C units and RTD temperature sen-
sor (α=0.00385) as follows:
a. Press SHIFT then SENSOR, and note the unit displays the temperature units:
UNITS: C.
b. Press ENTER, and note the unit displays the sensor type: SENS: TCOUPLE.
c. Using the cursor and range keys, set the display as follows: SENS: 4W-RTD.
d. Press ENTER, and note the unit displays: TYPE: PT100.
e. Using the cursor and range keys, set the unit for the following display: TYPE:
PT385.
f. Press ENTER to complete the temperature configuration process.
Select the temperature function by pressing the TEMP key.
Table 1-7, and verify that the temperature
-190.2 to -189.9°C
-0.2 to +0.2°C
749.8 to 750.2°C
-190.2 to -189.8°C
-0.2 to +0.2°C
1349.8 to 1350.2°C
Table 1-1) to the Model 2700
Figure 1-5 for similar con-