Measurement Computing WaveBook rev.5.3 - Manual (Page 127)

WaveBook User’s Manual – IO version 979194 Troubleshooting 7-19
(3) Topic: WBK14 - Dynamic Signal Conditioning Module
Question: Why can't I use the external clock feature on the WBK14 to control my acquisition speed?
Answer: The external clock on the WBK14 is used to dynamically move the corner frequency of the
filter, not pace the A/D in the WaveBook. This feature is often required in vibration
applications where the filter is moved as the device under test is vibrated (or excited) at varying
frequencies. Unlike the WaveBook/516 that has a special input for clocking the A-to-D, the
WaveBook/512 has no provisions to do so.
Question: Is there anything special I should know about WBK14’s power-up state?
Answer: At power-up the current output of the WBK14 is open circuited. It is only after being
programmed that the current source is engaged.
Question: In regard to attenuation, what is the filter roll-off for the WBK14 filter?
Answer: The WBK14's Butterworth filter is down 3 dB at the corner frequency. Beyond that point, the
signal attenuates at 48 dB per octave or 160 dB per decade. This is a substantial amount of
attenuation for most applications.
(4) Topic: WBK20 - PCMCIA/EPP Interface Card
Question: How do I configure the WBK20?
Answer: Insert the WBK20 into the PCMCIA slot. Windows should recognize it and display a window
'New Hardware Found' followed by a window 'Building driver data base'.
Select the option 'Select driver from disk provided by hardware manufacturer'. 'Install from
disk' is the next window. Provide a path to the floppy drive after you have inserted the disk that
came with the WBK20. It contains a file 'IOTWBK20.INF'. Select OK.
In the next window, select 'IOtech Inc' in the left box and 'IOtech WBK20: 1 Parallel Port' in the
right box. Select OK. At this time, it may ask for your Windows CD or certain diskettes. Then
you will be prompted to restart the computer.
The WBK20 will show up in Control Panel/System/Device Manager/ Ports (COM and LPT) as
'IOtech WBK20: 1 Parallel Port LPT#'. Double clicking on this will show you the resources
(IRQ and I/O range).