Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 788

Model 2606B System SourceMeter® Instrument Reference Manual
Recommended verification equipment
The following table summarizes recommended maximum allowable test equipment uncertainty for
verification points. Total test equipment measurement uncertainty should meet or be less than the
listed values at each test point. Generally, test equipment uncertainty should be at least four times
better than corresponding 2606B specifications.
Recommended verification equipment
Description
Digital multimeter
0.5 Ω, 250 W, 0.1%
precision resistor
1 GΩ, 200 V, 1%
standard
1
Ninety-day specifications show full-range accuracy of recommended model used for specified
measurement point.
2
Id.
3
Resistor used to test 3 A range should be characterized to uncertainty shown using resistance
function of digital multimeter before use.
Standard is a guarded and characterized 1 GΩ resistor that is used to test the 100 nA current range.
4
Calibration limits
The calibration limits stated in this section have been calculated using only the 2606B one-year
accuracy specifications. They do not include test equipment uncertainty. If a particular measurement
falls outside the allowable range, recalculate new limits based both on the 2606B specifications and
corresponding test equipment specifications.
Source limit calculations
As an example of how verification limits are calculated, assume you are testing the 6 V dc output
range using a 5.4 V output value. Using the one-year accuracy specification for 5.4 V dc output of
± (0.02% of output + 1.8 mV offset), the calculated output limits are:
Output limits = 5.4 V ± [(5.4 V × 0.02%) + 1.8 mV]
Output limits = 5.4 V ± (0.00108 V + 0.0018 V)
Output limits = 5.4 V ± 0.00288 V
Output limits = 5.39712 V to 5.40288 V
2606B-901-01 Rev. C November 2021
Manufacturer and Accuracy
model
Keithley Instruments
DC voltage
Model 2002
or
Keysight 3458A
DC current
Isotek Resistance
RUG-Z-R500-0.1-TK3
Keithley Instruments Resistance
2600-STD-RES
Section 17: Calibration
1
90 mV: ±8 ppm
0.9 V: ±5 ppm
5.4 V: ±4 ppm
18 V: ±6 ppm
2
90 nA: ±430 ppm
0.9 mA: ±45 ppm
9 µA: ±25 ppm
90 µA: ±23 ppm
0.9 mA: ±20 ppm
9 mA: ±20 ppm
90 mA: ±35 ppm
0.9 A: ±110 ppm
3 0.5 Ω
±125 ppm
1 GΩ:
4
±250 ppm
17-3