XITRON 2000I, User Manual

Page: 88 / 96

88
2000I & 2000M User Guide, Rev B
Note: To maintain accuracy whenever outside this temperature range, apply
the relevant temperature coefficient adder.
Settling Time: -------Less than 2 seconds to within 10ppm of 0.25µV
Drive Capability: ---15mA max. (50
Ω
output impedance below 220mV, 0.1
Ω
above 220mV)
Overload:-------------Output fully protected against short-circuits
Long-Term Effects: Add 25ppm of output to 1 year specification for 3 year
accuracy
DC Current Output Specifications
The accuracy figures given in Table 8 are valid throughout the temperature
range of 18º to 28ºC. The 24 hour stability figures are for constant load and
temperature (within 1ºC) and are measured using a DC to 2Hz bandwidth.
The accuracy figures are relative to calibration standards. Add 15ppm + 20pA
to the current figures for absolute accuracy.
Table 8: DC Current Output
Levels < 22µA 22 – 220µA 0.22 – 2.2mA 2.2 - 22mA
Resolution 10pA 100pA 1nA 10nA
24 Hr. Stability (ppm + nA) 7.0 + 0.03 5.0 + 0.15 5.0 + 1.0 5.0 + 15
90 Day Accuracy (ppm + nA) 50 + 0.05 40 + 0.15 30 + 1.0 40 + 20
1 Year Accuracy (ppm + nA) 70 + 0.1 60 + 0.25 50 + 2.0 60 + 30
Temperature Coefficient P
(ppm + nA) /
°
C
5.0 + 0.015 5.0 + 0.1 5.0 + 1.0 5.0+1.0
Pk-PK Noise 0.01 – 10Hz
(ppm+ nA)
1.5 + 0.02 1.2 + 0.1 0.8 + 0.5 0.8 + 5.0
RMS Noise 10Hz – 10kHz 200pA 750pA 5nA 50nA
DC current output is available in both the 2000I and the 2000M instruments.