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 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 x .07 +1)] =
±16.3 µV = ±0.000016 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 x 300)] = ± 47000 µV = ±0.047 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 calibration and
23
o
C ±1
o
C) follows, where Datron Accuracy =±(ppm OUTPUT + ppm
FS).
Datron
Output
Datron
Range
(Ohms)
Datron
Accuracy
(ppm)
Calibration
Uncertainty
(ppm)
1 k
Ω
100 k
Ω
1 M Ω
1.0000000k
100.00000k
1.0000000M
3
3
10
5
6
12
Example: Calculate 4-Wire Ohms Measurement Uncertainty
For the 100 k
Ω range, measurement uncertainty = [(3 x 10
-6
x 10
5
)
+ (6 x 10
-6 x
10
5
)] Ω = (0.3 + 0.6) Ω = 0.900 Ω.
Agilent E1411A/E1411B Service Manual Calculating Multimeter Accuracy 67