Resistance; Dc Current - Tektronix DMM4020 Technical Reference Manual

Resistance

Specifications are for 4-wire resistance function, or 2-wire resistance with REL. If REL is not used, add 0.2 Ω for 2-wire
resistance plus lead resistance.
Measurement Method ....................................... Current source referenced to LO input
Max Lead Resistance (4-wire ohms) ............... 10 % of range per lead for 200 Ω, 2 kΩ ranges. 1 kΩ per lead on all
Input Protection ................................................ 1000 V on all ranges
Full-Scale
Range
(5-1/2 Digits)
200 Ω 199.999 Ω
2 kΩ 1.99999 kΩ
20 kΩ 19.9999 kΩ
200 kΩ 199.999 kΩ
2 MΩ 1.99999 MΩ
20 MΩ 19.9999 MΩ
100 MΩ 100.000 MΩ
Range
90 days
23 °C ± 5 °C
200 Ω
0.02 + 0.004
0.015 + 0.002
2 kΩ
0.015 + 0.002
20 kΩ
0.015 + 0.002
200 kΩ
2 MΩ 0.03 + 0.003
20 MΩ 0.2 + 0.003
1.5 + 0.004
100 MΩ
Notes:
Uncertainty given as ± (% of reading + % of range)
[1]

DC Current

Input Protection ............................................... Tool accessible 11 A / 1000 V and 440 mA / 1000 V fuses.
Shunt Resistance .............................................. 0.01 Ω for 2 A and 10 A ranges
Full-Scale
Range
(5-1/2 Digits)
200 µA 199.999 µA
1999.99 µA
2 mA
20 mA 19.9999 mA
200 mA 199.999 mA
2 A 1.99999 A
10 A 10.0000 A
other ranges.
Input Characteristics
Resolution
Slow Medium
0.001 Ω 0.01 Ω
0.01 Ω 0.1 Ω
0.1 Ω 1 Ω
1 Ω 10 Ω
10 Ω 100 Ω
100 Ω
1 kΩ
1 kΩ 10 kΩ
Accuracy
[1]
Uncertainty
1 year
23 °C ± 5 °C
0.03 + 0.004
0.02 + 0.003
0.02 + 0.003
0.02 + 0.003
0.04 + 0.004
0.25 + 0.003
1.75 + 0.004
1 Ω for 20 mA and 200 mA
Burden voltage < 5 mV for 200 µA and 2 mA range.
Input Characteristics
Resolution
Slow Medium
0.001 µA 0.01 µA
0.01 µA 0.1 µA
0.1 µA 1 µA
1 µA 10 µA
10 µA 100 µA
100 µA
1 mA
Introduction and Specifications
Electrical Specifications
Current Source
Fast
0.01 Ω
0.8 mA
0.1 Ω
0.8 mA
1 Ω
0.08 mA
10 Ω
0.008 mA
0.9 µA
100 Ω
0.16 µA
1 kΩ
0.16 µA || 10 MΩ
10 kΩ
Temperature Coefficient/°C
Outside 18 – 28 °C
0.003 + 0.0006
0.003 + 0.0005
0.003 + 0.0005
0.003 + 0.0005
0.004 + 0.0005
0.01 + 0.0005
0.2 + 0.0005
Burden Voltage
Fast
0.01 µA
<5 mV
0.1 µA
<5 mV
1 µA
<0.05 V
10 µA
<0.5 V
100 µA
<0.1 V
<0.5 V
1 mA
1
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