Ac Current Accuracy; Additional Low Frequency Errors; Frequency; Frequency Accuracy - Fluke 2638A User Manual

2638A
Users Manual

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
100 µA
1 mA
10 mA
100 mA

Additional Low Frequency Errors

Error is stated as % of reading.

Frequency

Gate Times ............................................................. 100 milliseconds to 1 second.
Measurement Method ........................................... Flexible counting technique. AC-coupled input using the ac voltage
Settling Considerations........................................ When measuring frequency after a dc offset voltage change, errors
Measurement Considerations.............................. To minimize measurement errors, shield inputs from external noise

Frequency Accuracy

Accuracy is given as ± % of measurement.
Range
100 mV to
[1] [2]
300 V
[1] Input >100 mV. For 10 mV to 100 mV, multiply percent measurement error by 10.
[2] Limited to 3 x 10

Resistance

Measurement Method ........................................... Current source referenced to LO input.
Max. Lead Resistance (4-wire ohms) .................. 10 Ω per lead for 100 Ω, 1 kΩ ranges. 1 kΩ per lead on all other
Input Protection .................................................... 300 V on all ranges.
1-18
info@Fluke-Direct.com
24 Hour
Frequency
(23 ±1 °C)
20 Hz to 2 kHz 0.2 % + 0.06 %
20 Hz to 2 kHz 0.2 % + 0.06 %
20 Hz to 2 kHz 0.2 % + 0.06 %
20 Hz to 2 kHz 0.2 % + 0.06 %
Frequency
20 Hz to 40 Hz
40 Hz to 100 Hz
100 Hz to 200 Hz
200 Hz to 1 kHz
>1 kHz
24 Hour
Frequency
(23 ±1 °C)
20 Hz to 40 Hz 0.03 %
40 Hz to 1 MHz
0.006 %
7
volt-Hertz
Fluke-Direct
90 Days 1 Year
(23 ±5 °C) (23 ±5 °C)
0.25 % + 0.06 % 0.3 % + 0.06 %
0.25 % + 0.06 % 0.3 % + 0.06 %
0.25 % + 0.06 % 0.3 % + 0.06 %
0.25 % + 0.06 % 0.3 % + 0.06 %
AC Filter
20 Hz
0 %
0 %
0 %
0 %
0 %
measurement function.
may occur. For the most accurate measurement, wait up to 1 second
for the input blocking capacitor to settle.
when measuring low-voltage, low-frequency signals.
90 Days
(23 ±5 °C) (23 ±5 °C)
0.03 %
0.01 %
ranges.
T.C./ °C Outside
18 °C to 28 °C
0.015 % + 0.005 %
0.015 % + 0.005 %
0.015 % + 0.005 %
0.015 % + 0.005 %
200 Hz
−
0.55 %
0.2 %
0.02 %
0 %
T.C./ °C
1 Year
Outside 18
°C to 28 °C
0.03 % 0.001 %
0.01 % 0.001 %
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