Fluke 8845A FE 8845A & 8846A Users Manual - Page 28

Frequency, 8846A Accuracy, Gate Time vs. Resolution, Additional Low Frequency Errors - vs 8846a

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8845A/8846A Users Manual Frequency Gate Times Programmable to 1 s, 100 ms, and 10 ms. Measurement Method Flexible counting technique. AC-coupled input using the ac voltage measurement function. Settling Considerations When measuring frequency or period 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. 8846A Accuracy Accuracy is given as ± % measurement Range 100 mV to 1000 V[1][2] Frequency 3 - 5 Hz 24 Hour (23 ± 1 °C) 90 Days (23 ± 5 °C) 1 Year (23 ± 5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 0.1 0.1 0.1 0.005 5 - 10 Hz 0.05 0.05 0.05 0.005 10 - 40 Hz 0.03 0.03 0.03 0.001 40 Hz - 300 kHz 0.006 0.01 0.01 0.001 300 kHz - 1 MHz 0.006 0.01 0.01 0.001 [1] Input >100 mV. For 10 - 100 mV, multiply percent measurement error by 10. [2] Limited to 8 X 107 volt-Hertz 8845A Accuracy Accuracy is given as ± % measurement Range 100 mV to 750 V[1][2] Frequency 3 - 5 Hz 5 - 10 Hz 10 - 40 Hz 40 Hz - 300 kHz 24 Hour (23 ± 1 °C) 90 Days (23 ± 5 °C) 1 Year (23 ± 5 °C) Temperature Compensation/ °C Outside 18 to 28 °C 0.1 0.1 0.1 0.005 0.05 0.05 0.05 0.005 0.03 0.03 0.03 0.001 0.006 0.01 0.01 0.001 [1] Input >100 mV. For 10 - 100 mV, multiply percent measurement error by 10. [2] Limited to 8 X 107 volt-Hertz Gate Time vs. Resolution Gate Time 0.01 0.1 1.0 Resolution 5½ 6½ 6½ Additional Low Frequency Errors Error stated as percent of measurement for inputs >100 mV. For 10 - 100 mV, multiply percent by 10. Resolution Frequency 6½ 5½ 4½ 3 - 5 Hz 0 0.12 0.12 5 - 10 Hz 0 0.17 0.17 10 - 40 Hz 0 0.2 0.2 40 - 100 Hz 0 0.06 0.21 100 - 300 Hz 0 0.03 0.21 300 Hz - 1 kHz 0 0.01 0.07 > 1 kHz 0 0 0.02 1-18

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8845A/8846A
Users Manual
1-18
Frequency
Gate Times
.............................................................
Programmable to 1 s, 100 ms, and 10 ms.
Measurement Method
...........................................
Flexible counting technique. AC-coupled input using the ac voltage
measurement function.
Settling Considerations
........................................
When measuring frequency or period 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.
8846A Accuracy
Accuracy is given as
±
% measurement
Range
Frequency
24 Hour
(23
±
1
°
C)
90 Days
(23
±
5
°
C)
1 Year
(23
±
5
°
C)
Temperature
Coefficient/
°
C
Outside 18 to 28
°
C
3 – 5 Hz
0.1
0.1
0.1
0.005
5 – 10 Hz
0.05
0.05
0.05
0.005
10 – 40 Hz
0.03
0.03
0.03
0.001
40 Hz – 300 kHz
0.006
0.01
0.01
0.001
100 mV to
1000 V
[1][2]
300 kHz – 1 MHz
0.006
0.01
0.01
0.001
[1] Input >100 mV. For 10 – 100 mV, multiply percent measurement error by 10.
[2] Limited to 8 X 10
7
volt-Hertz
8845A Accuracy
Accuracy is given as
±
% measurement
Range
Frequency
24 Hour
(23
±
1
°
C)
90 Days
(23
±
5
°
C)
1 Year
(23
±
5
°
C)
Temperature
Compensation/
°
C
Outside 18 to 28
°
C
3 – 5 Hz
0.1
0.1
0.1
0.005
5 – 10 Hz
0.05
0.05
0.05
0.005
10 – 40 Hz
0.03
0.03
0.03
0.001
100 mV to
750 V
[1][2]
40 Hz – 300 kHz
0.006
0.01
0.01
0.001
[1] Input >100 mV. For 10 – 100 mV, multiply percent measurement error by 10.
[2] Limited to 8 X 10
7
volt-Hertz
Gate Time vs. Resolution
Gate Time
Resolution
0.01
5½
0.1
6½
1.0
6½
Additional Low Frequency Errors
Error stated as percent of measurement for inputs >100 mV. For 10 – 100 mV, multiply percent by 10.
Resolution
Frequency
6½
5½
4½
3 – 5 Hz
0
0.12
0.12
5 – 10 Hz
0
0.17
0.17
10 – 40 Hz
0
0.2
0.2
40 – 100 Hz
0
0.06
0.21
100 – 300 Hz
0
0.03
0.21
300 Hz – 1 kHz
0
0.01
0.07
> 1 kHz
0
0
0.02