Fai A/D Frequency Measurement Specifications - Fluke 2680A Service Manual

268XA
Service Manual
Thermistor
Temp C
-40 to 150
Steinhart – Hart Equation: 1/(T
Default constants are supplied only for a YSI (type 004) 2,252
constants for other thermistors. The ranges of thermistor constants are as follows: A 1.0E-4 to
1.0E-2, B 1.0E-5 to 1.0E-3, and C 1.0E-8 to 1.0E-6.
* Assumes 4-wire measurement.

FAI A/D Frequency Measurement Specifications

The following tables provide FAI A/D specifications for the frequency measurement
function.
Range
15 Hz to 900 Hz
900 Hz to 9 kHz
9 kHz to 90 kHz
90 kHz to 900 kHz
1 MHz
Frequency Range
15 Hz to 70 kHz
70 kHz to 100 kHz
100 kHz to 200 kHz
200 kHz to 300 kHz
300 kHz to 1 MHz
1-28
Table 1-34. FAI A/D Thermocouple Specifications (cont.)
Range*
100 to 100 m
o
Kelvin) = A + B*(ln
Table 1-35. FAI A/D Frequency Accuracy Specifications
Frequency Measurement Accuracy, 1 Year, -10 C to 60 C
Resolution
Slow Fast
0.01 Hz 0.1 Hz
0.1 Hz 1 Hz
1 Hz 10 Hz
10 Hz 100 Hz
100 Hz 1 kHz
Table 1-36. FAI A/D Frequency Sensitivity Specifications
Minimum Signal
100 mV ac rms
100 mV ac rms
150 mV ac rms
150 mV ac rms
Linearly increasing from 150 mV
ac rms at 300 kHz to 2 V ac rms
at 1 MHz
Accuracy + C
90 Day
Slow
0.4 0.51
3
) + C*(ln )
thermistor, you can enter
Accuracy + (% input + Hz)
Slow
0.05%+0.02 Hz
0.05%+0.1 Hz
0.05%+1 Hz
0.05%+10 Hz
0.05%+100 Hz
Maximum Signal
30 V ac rms
20 V ac rms
10 V ac rms
7 V ac rms
Linearly decreasing from 7 V ac
rms at 300 kHz to 2 V ac rms
at 1 MHz
1 Year
Slow
18 to 23 C
Fast
0.05%+0.2 Hz
0.05%+1 Hz
0.05%+10 Hz
0.05%+100 Hz
0.05%+1 kHz