Tegam 840A - Page 33

Table 6: Clibration of Calibrator-Mode Resistance Functions
(RTD-Thermistor)
* exclusive of noise.
2. CALIBRATION VERIFICATION
Calibration is verified with the same instrument hookups as used for calibra-
tion (ie. Figures 12 and 13 for thermocouple functions, Figure 14 for resis-
tance functions).
While one hookup serves to verify all resistance functions (RTD, thermistor,
ohms), a full check-out of thermocouple functions requires a set of calibration
cables for each thermocouple type.
To simplify the verification of thermocouple calibration, software has been
enhanced to reactivate the copper-mode used during calibration. This feature
is available on products that use the following (and later) software revisions:
32
Step
Sensor
Select
Unit
Output
Adjust
Verify
DMM
Reading*
1
2
3
4
5
6
7
8
9
10
RTD-100
RTD-100
RTD-100
1,000Ω
1,000Ω
100,000Ω
100,000Ω
Thermistor
Thermistor
Thermistor
1562.0°F
32.0°F
-328.0°F
900.00Ω
1.00Ω
90,000Ω
100Ω
293.0°F
77.0°F
-40.0°F
1mA
1mA
1mA
1mA
1mA
10µA
10µA
1mA
10µA
10µA
P38
P51
√
√
√
√
√
√
√
√
0.39048v
0.10000
±0.00006v
0.01852
±0.00012v
0.90000
±0.00020v
0.00100
±0.00020v
0.90000v
0.00100
±0.00020v
0.04700
±0.00020v
0.02252
±0.00020v
0.75790
±0.00500v
Current
Source
Input