Service manual

Calculate ACV
Measurement
Uncertainty
From Section 6 - Specifications of the Datron 4708 User’s Handbook, AC
Voltage (Option 20) Accuracy (90 days since last calibration and
23
o
C ± 1
o
C) where Datron Accuracy = ± (ppm OUTPUT + ppm FS).
Datron
Output
(ACV)
Datron
Range
Datron
Freq
Datron
Accuracy
(ppm)
Calibration
Uncertainty
(ppm)
0.07
0.07
0.07
0.07
300.0
100 mV
100 mV
100 mV
100 mV
1000 V
20 Hz
60 Hz
5 kHz
10 kHz
5 kHz
110 + 20 + 5 µV
60 + 20 + 5 µV
50 + 20 + 5 µV
50 + 20 + 5 µV
90 + 10
30 + 1 µV
30 + 1 µV
30 + 1 µV
30 + 1 µV
30
Example: Calculate AC Voltage Measurement Uncertainty
Since Measurement Uncertainty = Datron Accuracy + Calibration
Uncertainty, for a 0.07 ACV OUTPUT to the multimeter and the
Datron 4708 range set to 100 mV at 60 Hz, Measurement Uncertainty
(µV)= ± [(60.0 x 0.07) + (2 x 20 x .1) + 5 ] + [(30 + 1)] = ± 44.2 µV =
± 0.000044 V.
Or, for a 300 ACV OUTPUT to the multimeter and the Datron 4708
range set to 1000 V at 5 kHz, Measurement Uncertainty (µV) = ± [(90.0
x 300.0) + (10 x 1100)] + 30 = ± 38030 µV = ± 0.038030 V.
Calculate
Resistance
Measurement
Uncertainty
From Section 6 - Specifications of the Datron 4708 User’s Handbook,
4-Wire Resistance (Option 30) Accuracy (90 days since last calibration
and 23
o
C ± 1
o
C) follows, where Datron Accuracy = ± (ppm OUTPUT
+ ppm FS).
Datron
Range
(Ohms)
Datron
Accuracy
(ppm)
Calibration
Uncertainty
(ppm)
1.0000000k
100.00000k
1.0000000M
3
3
10
5
6
12
Example: Calculate 4-Wire Ohms Measurement Uncertainty
For the 100k Ω range, measurement uncertainty = [(3 x 10
-6
x 10
5
) +
(6 x 10
-6
)] Ω = (0.3 + 0.000006) Ω = 0.300 Ω.
Calculating Multimeter Accuracy A-5