Measurement Computing WaveBook rev.3.0 - Manual (Page 48)

3-16 WBK14, WBK Expansion Options WaveBook User’s Manual
Frequency Response to 5% of
Maximum Output Signal Amplitude
Drive Current
(mA)
Cable Length
@30 pF/ft (Ft)
± 1 V ± 5 V
2 10 185 kHz 37 kHz
2 100 18.5 kHz 3.7 kHz
2 1000 1.85 kHz 370 Hz
4 10 550 kHz 110 kHz
4 100 55 kHz 11 kHz
4 1000 5.5 kHz 1.1 kHz
f
K
C
V
Icc Ib
=
−





 2 π
Where:
f = Maximum frequency in Hz
K = 3.45 ×10
9 . K is the scale factor to convert Farads to picoFarads and Amperes to milliAmperes
and a factor to allow cable capacitance to charge to 95% of the final charge.
C = Cable capacitance in picoFarads
V = Maximum peak measured voltage from sensor in volts
Icc = Constant current from current source in mA
Ib = Current required to bias the internal electronics, typically 1 mA
WBK14 - Specifications
Specifications are provided in Appendix A.