Fluke 2638A/05 User Manual - Page 28

AC Current Input Characteristics, AC Current Accuracy, Additional Low Frequency Errors, Frequency

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2638A Users Manual AC Current Input Characteristics Range Resolution 4 ½ Digits Resolution 5 ½ Digits 6 ½ Digits Reference Resistance Burden Voltage 100 μA 1 mA 10 mA 100 mA 100.0000 µA 1.000000 mA 10.00000 mA 100.0000 mA 10 nA 100 nA 1 μA 10 μA 1 nA 10 nA 100 nA 1 μA 0.1 nA 1 nA 10 nA 100 nA 1 kΩ 1 kΩ 10 Ω 10 Ω

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2638A
Users Manual
1-18
AC Current Input Characteristics
Range
Resolution
Resolution
Reference
Resistance
Burden
Voltage
4 ½
Digits
5 ½
Digits
6 ½
Digits
100
μ
A
100.0000 μA
10 nA
1 nA
0.1 nA
1 k
Ω
<10 mV (RMS)
1 mA
1.000000 mA
100 nA
10 nA
1 nA
1 k
Ω
<10 mV (RMS)
10 mA
10.00000 mA
1
μ
A
100 nA
10 nA
10
Ω
<20 mV (RMS)
100 mA
100.0000 mA
10
μ
A
1
μ
A
100 nA
10
Ω
<50 mV (RMS)
AC Current Accuracy
Accuracy is given as ± (% measurement + % of range). Basic accuracy specification is for a sinusoidal signal with
amplitude greater than 5 % of range. For input signals between 1 % to 5 % of range, add 0.1 % of range.
Range
Frequency
24 Hour
(23 ±1 °C)
90 Days
(23 ±5 °C)
1 Year
(23 ±5 °C)
T.C./ °C Outside
18 °C to 28 °C
100
μ
A
20 Hz to 2 kHz
0.2 % + 0.06 %
0.25 % + 0.06 %
0.3 % + 0.06 %
0.015 % + 0.005 %
1 mA
20 Hz to 2 kHz
0.2 % + 0.06 %
0.25 % + 0.06 %
0.3 % + 0.06 %
0.015 % + 0.005 %
10 mA
20 Hz to 2 kHz
0.2 % + 0.06 %
0.25 % + 0.06 %
0.3 % + 0.06 %
0.015 % + 0.005 %
100 mA
20 Hz to 2 kHz
0.2 % + 0.06 %
0.25 % + 0.06 %
0.3 % + 0.06 %
0.015 % + 0.005 %
Additional Low Frequency Errors
Error is stated as % of reading.
Frequency
AC Filter
20 Hz
200 Hz
20 Hz to 40 Hz
0 %
−
40 Hz to 100 Hz
0 %
0.55 %
100 Hz to 200 Hz
0 %
0.2 %
200 Hz to 1 kHz
0 %
0.02 %
>1 kHz
0 %
0 %
Frequency
Gate Times
.............................................................
100 milliseconds to 1 second.
Measurement Method
...........................................
Flexible counting technique. AC-coupled input using the ac voltage
measurement function.
Settling Considerations
........................................
When measuring frequency after a dc offset voltage change, errors
may occur. For the most accurate measurement, wait up to 1 second
for the input blocking capacitor to settle.
Measurement Considerations
..............................
To minimize measurement errors, shield inputs from external noise
when measuring low-voltage, low-frequency signals.
Frequency Accuracy
Accuracy is given as ± % of measurement.
Range
Frequency
24 Hour
(23 ±1 °C)
90 Days
(23 ±5 °C)
1 Year
(23 ±5 °C)
T.C./ °C
Outside 18
°C to 28 °C
100 mV to
300 V
[1] [2]
20 Hz to 40 Hz
0.03 %
0.03 %
0.03 %
0.001 %
40 Hz to 1 MHz
0.006 %
0.01 %
0.01 %
0.001 %
[1] Input >100 mV. For 10 mV to 100 mV, multiply percent measurement error by 10.
[2] Limited to 3 x 10
7
volt-Hertz