Agilent Technologies 3458A Calibration Manual page 85

3 / DC Current
DC Current (DCI Function)
Maximum
Range Full Scale Resolution
100 nA 120.000 1 pA
1 µA 1.200000 1 pA
10 µA 12.000000 1 pA
100 µA 120.00000 10 pA
1 mA 1.2000000 100 pA
10 mA 12.000000 1 nA
100 mA 120.00000 10 nA
1 A 1.0500000 100 nA
3
Accuracy (ppm Reading + ppm Range)
Range 24 Hour
6
10+400
100 nA
6
10+40
1 µA
10 µA
10+7
6
100 µA 10+6
1 mA 10+4
10 mA 10+4
100 mA 25+4
1 A 100+10
Settling Characteristics
For first reading or range change error, add .001%
of input current step additional error. Reading
settling times can be affected by source impedance
and cable dielectric absorption characteristics.
Additional Errors
*RMS Noise For RMS noise error,
multiply RMS noise result
Range Multiplier
from graph by multiplier
100 nA ×100
in chart. For peak noise
1 µA ×10
error, multiply RMS noise
10 µA to 1A ×1
error by 3.
Shunt Burden
Resistance Voltage
545.2 kW 0.055 V
45.2 kW 0.045 V
5.2 kW 0.055 V
730 W
0.075 V
100 W
0.100 V
10 W
0.100 V
1 W
0.250 V
0.1 W
<1.5 V
4 5
90 Day
30+400
15+40
15+10
15+8
15+5
15+5
30+5
100+10
Measurement Considerations
Agilent recommends the use of PTFE cable or other
high impedance, low dielectric absorption cable for low
current measurements. Current measurements at rates
<NPLC 1 are subject to potential noise pickup. Care
must be taken to provide adequate shielding and
guarding to maintain measurement accuracies
Selected Reading Rates
NPLC
0.0001
0.0006
0.01
0.1
1
10
100
Maximum Input
I to LO
LO to Guard
Guard to
Earth
Temperature Coefficient
(ppm of Reading + ppm of Range) / °C
1
Without ACAL With ACAL
10+200
2+20
10+4
10+3
10+2
10+2
25+2
25+3
5
1 Year 2 Year
30+400 35+400
20+40 25+40
20+10 25+10
20+8 25+8
20+5 25+5
20+5 25+5
35+5 40+5
110+10 115+10
7
Aperture Digits Readings / Sec
1.4 µs 4.5 2,300
10 µs 5.5 1,350
8
167 µs 6.5 157
8
1.67 ms 6.5 108
8
16.6 ms 7.5 26
8
0.166 s 7.5 3
7.5 18/min
Rated Input Non-Destructive
<1.25 A rms
±1.5 A pk
±200 V pk ±350 V pk
±500 V pk ±1000 V pk
Appendix A Specifications
1. Additional error from
Tcal or last ACAL±1°C.
2. Additional error from
2
Tcal± 5°C.
2+50
3. Specifications are for
2+5
PRESET; NPLC 100.
2+1
4. Tcal± 1°C.
2+1
5. Specifications for 90 day,
2+1
1 year, and 2 year are
2+1
within 24 hours and ±1°C
2+1
of last ACAL; Tcal±5°C
2+2
Add 5 ppm of reading
additional error for
Agilent factory
5
traceability to US NIST.
Traceability error is the
sum of the 10 V and 10
kW traceability values.
6. Typical accuracy.
7. For PRESET; DELAY 0;
DlSP OFF; OFORMAT
DINT; ARANGE OFF.
8. Aperture is selected
independent of line
frequency (LFREQ).
These apertures are for 60
Hz NPLC values where 1
NPLC = 1/ LFREQ. For
50 Hz and NPLC
Indicated, aperture will
increase by 1.2 and
reading rates will decrease
by 0.833.
85