2640A/2645A NetDAQ
Users Manual
A-16
2640A Frequency Measurement Specifications A-20.
Tables A-22 to A-23 provide 2640A specifications for the frequency measurement
function.
Table A-22. 2640A Frequency Accuracy Specifications
Frequency Measurement Accuracy, 1 Year, -10ºC to 60ºC
Range
Resolution Accuracy ±(% input + Hz)
Slow Fast Slow Fast
15 Hz to 900 Hz 0.01 Hz 0.1 Hz 0.05%+0.02 Hz 0.05%+0.2Hz
900 Hz to 9 kHz 0.1 Hz 1 Hz 0.05%+0.1 Hz 0.05%+1 Hz
9 kHz to 90 kHz 1 Hz 10 Hz 0.05%+1 Hz 0.05%+10 Hz
90 kHz to 900 kHz 10 Hz 100 Hz 0.05%+10 Hz 0.05%+100 Hz
1 MHz 100 Hz 1 kHz 0.05%+100 Hz 0.05%+1 kHz
Table A-23. 2640A Frequency Sensitivity Specifications
Frequency Measurement Sensitivity (Sine Wave)
Frequency Range Minimum Signal Maximum Signal
15 Hz to 70 Hz 100 mV rms V<150/300V rms* (depends on
channel used) and V*Hz<2*10
6
70 Hz to 100 kHz 100 mV rms 20V rms
100 kHz to 200 kHz 150 mV rms 10V rms
200 kHz to 300 kHz 150 mV rms 7V rms
300 kHz to 1 MHz Linearly increasing from 150V
rms at 300 kHz to 2V rms at 1
MHz
Linearly decreasing from 7V rms
at 300 kHz to 2V rms at 1 MHz
* 300V range applies to channels 1 and 11 only.
