Section 8
OM6530-C1-00
19 November, 2019
8-3
8.3.
PICOAMMETER MEASUREMENT SPECIFICATIONS
Note: The uncertainties listed in Table 8-3 are applicable after a one-hour warm-up period when
using the autoranging mode of operation. The accuracy is traceable to the International System
of Units (SI) through NRCC (Canada) or other National Metrology Institutes.
12 Month Uncertainty Direct Measurement ± % 23
C ± 5
C
Range (A)
Base
XR
XP
XPR
1uA
I
10uA
0.1
0.1
0.1
0.1
100nA
I
1uA
0.1
0.1
0.1
0.1
10nA
I
100nA
0.2
0.2
0.2
0.2
1nA
I
10nA
0.2
0.2
0.2
0.2
100pA
I
1nA
0.2
0.2
0.2
0.2
10pA
I
100pA
1
1
1
1
1pA
I
10pA
N/A
2
N/A
2
100fA
I
1pA
N/A
10
N/A
10
Table 8-3: Current Measurement Uncertainty (All Models)
8.4.
RESOLUTION
When the Model 6530 is used with short integration time periods, the measurement resolution is
limited by the quantization error in the time measuring circuit (plus or minus one clock period).
When the quantization error is not significant, the display resolution is truncated at a value
commensurate with the short-term measurement stability. The measurement display resolution
can be set by the user using the
Set Up Menu
option. The default resolution is fixed at 6 digits.
If the
<Auto res>
option is selected then the instrument will set the resolution based on Table 8-
4.
Integrating Capacitor
Display Resolution (Digits)
Integration Time
pF
5.4
mSec
54
mSec
540
mSec
5.4
Sec
Up To
20000 Sec
27
5
5
6
6
5
270
5
6
7
7
7
2700
6
7
7
7
7
Table 8-4: Measurement Resolutions (Digits)
Note: The measurements can be performed with reduced accuracy for integration
times less than 5.4ms down to 3ms.
Содержание 6530 Series
Страница 2: ......
Страница 12: ...OM6530 C1 00 19 November 2019 x...
Страница 18: ...Section 1 OM6530 C1 00 19 November 2019 1 6 Figure 1 4 6530 Operational Integrator...