Measurement Accuracy; Accuracy Equations - Agilent Technologies 4284A Technical Overview

Specifications
from page 13
Continued
14
Measurement time
Agilent 4284A setting time
Integrated time
Short
Medium
Long
Agilent 4285A setting time
Integrated time
Short
Medium
Long
Option 4284A/4285A-001:

Measurement accuracy

The following conditions must be met:
1. Warm up time: ≥ 30 minutes
2. Ambient temperature: 23 °C ±5 °C
3. Test signal voltage: 0.3 Vrms to 1 Vrms
4. Test cable length: 0 m
5. Open and short corrections have been performed
6. D ≤ 0.1 for C, L, X and B measurements
Q ≤ 0.1 for R and G measurements
See operation manual for additional conditions.
Accuracies are relative to calibrated standards. Absolute accuracies are given as:
(Agilent 4284A's relative accuracy +calibration uncertainty of standards).

Accuracy equations

|Z|, |Y|, L, C, R, X, G and B accuracies are given as:
±[A + (K
where: 1. A is basic accuracy as shown in figure 1
2. K
The K
The K
3. K
D accuracy is given as:
±[A
where: 1. A
Q accuracy is given as (when Q
±[(Q
where: 1. Q
2. D
Time interval from a trigger command to the EOM
(end of measurement) signal output at the handler
interface port.
100 Hz 1 kHz
270 ms 40 ms
400 ms 190 ms
1040 ms 830 ms
75 kHz ~ 30 MHz
30 ms
65 ms
200 ms
DC bias current output: 100 mA max
(Agilent 4284A only)
+ K + K ) x 100] (% of reading)
a b c
and K are impedance proportional factors given in Table 2.
a b
term is negligible for impedance above 500 Ω.
a
term is negligible for impedances below 500 Ω.
b
is the calibration interpolation factor given in Table 1.
c
/100] (absolute D value)
e
= [A + (K + K + K ) x 100]
e a b c
x D < 1):
x e
2
x D )/(1 ](Q x D )] (absolute Q value)
x e x e
is the measured Q value
x
is the D accuracy
e
10 kHz 1 MHz
30 ms 30 ms
180 ms 180 ms
820 ms 820 ms
Specifications continued on page 15