Atec Agilent-4339B_4349B - Manual (Page 4)

4
Specifications
Measurement Accuracy
Agilent 4339B test conditions*:
1. Warm up time:
≥ 30 minutes
2. Ambient temperature: 23 °C ± 5 °C
3. Test cable length:
≤ 1.5 meters
4. Open error correction performed
5. Long measurement time setting
6. Contact check: off
Accuracy parameters:
Rm: Measured resistance value in W
Im: Measured current value in
amperes
Vs: Source voltage in volts
Vo: 0.1 V@Vs
≤ 200 V, 0.5 V@Vs > 200 V
Accuracy example:
To determine the accuracy of a meas-
urement use Figure 1, “Conversion
diagram”.
For example: determine the accuracy
of a 5 M
Ω (= 5 x 10
6
Ω) measurement
at 50 Vdc.
Rm = 5 x 10
6 Ω
Vs = 50 V
The intersection of Rm running paral-
lel to the 10
6
Ω diagonal line intersects
the vertical Vs line at the second row
from the bottom of the diagram. Mov-
ing horizontally across to Table 1, the
following equation is found:
100 Vo + (2.5 x 10 -7 x Rm)
0.5 +
Vs
Entering the values for Rm, Vo, and
Vs yields an accuracy of ±0.725%.
Figure1. Conversion diagram Table 1. Agilent 4339B measurement accuracy (±% of reading)
Resistance RM (
Ω) Current IM (A) Resistance measurement
Accuracy
Current measurement
Accuracy
Test voltage setting Vs (V)
V
o
= 0.1 V @ V
s
≤ 200 V
= 0.5 V @ V
s
> 200