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8845A/8846A
Users Manual
1-16
8845A Accuracy
Accuracy is given as ± (% measurement + % of range)
Range 24 Hour
(23 ±1 °C)
90 Days
(23 ±5 °C)
1 Year
(23 ±5 °C)
Temperature
Coefficient/ °C
Outside 18 to 28 °C
100 Ω 0.003 + 0.003 0.008 + 0.004 0.01 + 0.004 0.0006 + 0.0005
1 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
10 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
100 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
1 MΩ 0.002 + 0.001 0.008 + 0.001 0.01 + 0.001 0.0010 + 0.0002
10 MΩ 0.015 + 0.001 0.02 + 0.001 0.04 + 0.001 0.0030 + 0.0004
100 MΩ 0.3 + 0.01 0.8 + 0.01 0.8 + 0.01 0.1500 + 0.0002
Additional Ohms Errors
Digits NPLC Additional NPLC Noise Error
100 0 % of range
10 0 % of range
1 0.001 % of range
5½ 0.2
0.003 % of range ±7 mΩ
4½ 0.02
0.017 % of range ±15 mΩ
DC Current
Input Protection....................................................... Tool-accessible 11 A/1000 V and 440 mA/1000 V fuses, limits of
400 mA continuous 550 mA for 2 minutes on, 1 minute off.
Common Mode Rejection ............................................140 dB at 50 or 60 Hz ±0.1 % (1 kΩ unbalance)
Normal Mode Rejection .......................................... 60 dB for NPLC of 1 or greater with analog filter off and power line
frequency ±0.1 %
100 dB for NPLC of 1 or greater with analog filter on and power line
frequency ±0.1 %
Analog Filter............................................................ When using the analog filter, specifications are relative to within one
hour of using the ZERO function for that range and NPLC setting.
Input Characteristics
Resolution
Range Resolution
4½ Digits 5½ Digits 6½ Digits
Shunt Resistance
(Ohms) Burden Voltage
100 μA 100.0000 μA 10 nA 1 nA 100 pA 100 Ω <0.015 V
1 mA 1.000000 mA 100 nA 10 nA 1 nA 100 Ω <0.15 V
10 mA 10.00000 mA 1 μA 100 nA 10 nA 1 Ω <0.025 V
100 mA 100.0000 mA 10 μA 1 μA 100 nA 1 Ω <0.25 V
400 mA [3] 400.000 mA 100 μA 10 μA 1 μA 1 Ω <0.50 V
1 A [2] 1.000000 A
100 μA 10 μA 1 μA 0.01 Ω <0.05 V
3 A [1] 3.00000A 1 mA 100 μA 10 μA 0.01 Ω <0.15 V
10 A 10.00000 A 1 mA 100 μA 10 μA 0.01 Ω <0.5 V
[1] Part of 10 A range.
[2] Available on the front panel terminal only.
[3] 400 mA available in software version 2.0 or greater only. 400 mA continuously; 550 mA for 2 minutes on, 1 minute off.
26


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