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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
1.888.610.7664 sales@GlobalTestSupply.com
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