Measurement Computing WBK11A - Manual

WBK11A – SSH Card 988396 WBK11A, pg. 1
WBK11A Simultaneous Sample & Hold Card
Important Notice! WaveBook/516E Users
WBK option cards for WaveBook/516E are installed at the factory per customer order.
Users are not to remove or install cards for these products as the cards are not “plug-and-
play” for these devices and erroneous signal values could result. If you desire to remove
or add a card to WaveBook/516E contact the factory or your service representative.
Important Notice! WaveBook/516, /516A, /512A, and WBK10A Users
With exception of the WBK30 option, WBK option cards for WaveBook/516, /516A,
/512A, and WBK10A are installed at the factory per customer order. Users are not to
remove or install cards for these products [other than WBK30 series cards] as the cards
are not “plug-and-play” for these devices and erroneous signal values could result. If you
desire to remove or add a card to these products, contact the factory or your service
representative.
Description
The WBK11A is a simultaneous sample-and-hold card (SSH) that provide a means of obtaining concurrent
(<150 ns) capture from up to 8 input channels. The card virtually eliminates channel-to-channel time
skewing. The card is controlled by the acquisition system’s base WaveBook.
The WBK11A can be installed inside a WaveBook or in a WBK10A series module; however, it must be
installed by a qualified service representative (see the important notice above).
When using a WaveBook with an SSH channel enabled, the per-channel sample rates are
reduced. The rate reduction is the same as that which would occur if another channel were
added. The per-channel rate (with SSH enabled) is:
1 MHz / (n+1), where n is the number of active channels.
The WBK11A SSH card can accommodate higher gains than the main unit because its gains are fixed for
each channel prior to the acquisition. You can use WaveView to set each channel to the ranges listed in the
specifications on page 2. All channels equipped with SSH circuitry are sampled simultaneously as a
system.
Offset Adjust
Diff. Amp.
Sample/
Hold
+
PGA
-
One of 8 Channels (Typical)
MUX
Buffer
Amplifier
P10
mates
with
WaveBook
J10
P11
mates
with
WaveBook
J11
SCI - Serial
Configuration Interface
Octal
DAC
WBK11A Block Diagram