1-32 Performance Verification Model 2750 Multimeter/Switch System Service Manual
2. Install the Model 7700 in Slot 1 of the Model 2750, then turn on the power and
allow the unit to warm up for two hours before proceeding. Be sure the front panel
INPUTS switch is set to the REAR position.
3. Select the temperature function by pressing the TEMP key. Close Channel 1 by
pressing the CLOSE key, then ENTER for “SINGLE” channel, and keying in 101.
4. Configure the Model 2750 for °C units, type K temperature sensor, and internal
reference junction as follows:
a. Press SHIFT then SENSOR, and note the unit displays the temperature units:
UNITS: C. (If necessary, use the cursor and range keys to select °C units.)
b. Press ENTER. The unit displays the sensor type: SENS: TCOUPLE.
c. Make sure that TCOUPLE is displayed, then press ENTER. The unit displays
the thermocouple type: TYPE: J.
d. Select a type K temperature sensor, then press ENTER. The unit displays the
reference junction type: JUNC: SIM.
e. Select INT reference junction, then press ENTER.
NOTE Defaults for 7700, 7706, and 7708 modules are:
• K type.
• “C” units.
• Internal temperature sensor.
• Open Tdetect off.
• Sensor type: Tcouple.
5. Source each of the voltages summarized in Table 1-16 and verify that the tempera-
ture readings are within limits. Be sure to select the appropriate thermocouple type
for each group of readings. (See step 3 above.) Open Channel 1 after the test is
complete.
Tab le 1- 16
Model 7700 thermocouple temperature verification reading limits
Thermocouple Type Applied DC Voltage* Reading Limits (1 year, 18°C to 28°C)
J
K
-7.659mV
0mV
42.280mV
-5.730mV
0mV
54.138mV
-191.8 to -188.2°C
-1.0 to +1.0°C
749.0 to 751.0°C
-191.8 to -188.2°C
-1.0 to +1.0°C
1349.0 to 1351.0°C
*Voltages shown are based on ITS-90 standard.
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