Measurement Computing WaveBook rev.5.3 - Manual (Page 117)

WaveBook User’s Manual – IO version 979194 Troubleshooting 7-9
10. “Insufficient Memory”
Possible Causes Details and Possible Solutions
The PC’s
memory is low.
An “Insufficient Memory” message should appear when the host PC doesn’t have enough free memory
for the acquisition. The only solution is to use a PC that has sufficient free space to hold the amount of
data that the scan will produce. Note that each reading will occupy one 16-bit memory location.
The buffer size is
set too low in
WaveView.
An “Insufficient Memory” message can result from the Acquisition Buffer Size having been set too low
in WaveView. To view or change the buffer size, open WaveView’s System pull-down menu, then
select “Options.” A System Options dialog box will appear. In the bottom panel you can check a box
to indicate that you want to “Set a maximum acquisition buffer size (MB).” You can enter the desired
value for the buffer size, for example 32 MB. WaveView will report the total amount of memory
currently installed in your PC. If errors pertaining to available memory occur, try increasing the buffer
size. Additional information is included in the System Options section of the WaveView document.
11. Scan rate – The maximum rate cannot be reached.
Possible Causes Details and Possible Solutions
The SSH
function is in
effect.
Use of the SSH (Simultaneous Sample and Hold) function adds the equivalent of one more channel to
the scan, essentially reducing the scan rate. This channel addition is inherent to the use of the SSH
function.
The Multiple Ch
Analog trigger
is in effect.
Use of “Multiple Ch Analog” as the trigger type adds the equivalent of one more channel for each
channel in the trigger scheme. This reduces the maximum available scan rate. For more information,
refer to “Trigger Types” in the Acquisition Configuration section of the WaveView document.
12. External acquisition pacer does not work.
Possible Causes Details and Possible Solutions
The external
clock is not
enabled.
Before the external pacer clock feature can be used it must be enabled in WaveView. To enable the
external pacer clock: (1) Open the Acquisition Configuration window, (2) In the area labeled “Rate,”
click the button. A Clock Divider field will appear. (3) Optional - In the divider field enter
a divisor that is to be applied to the external clock signal. This is an 8-bit divisor with valid values from
1 to 255. For additional information refer to “External Clock and Counter-Timer” in the Acquisition
Configuration section of the WaveView document.
The clock signal
line is not
connected.
The external pacer clock, if enabled, still won’t work if it has no input signal. A signal line must be
connected to the WaveBook port labeled DIGITAL I/O, EXTERNAL CLOCK, TTL TRIGGR. A
“Clock and External Trigger Cable” p/n CA-178 can be used for this purpose. The cable connects to
the WaveBook via a DB25 connector and includes a line with a BNC connector to connect to the
external clock signal. Note that the clock signal goes through pin 20. The Digital I/O section of chapter
4 includes an illustration of the cable, as well as pinouts of WaveBook’s DIGITAL I/O, EXTERNAL
CLOCK, TTL TRIGGR connector.
The clock source
is not TTL
compatible.
The clock source must produce a square-wave signal between 0 and 5 volts to be TTL compatible. If
your clock signal does not meet these requirements switch to a clock source that does.
The clock source
exceeds 1MHz
or exceeds the
maximum scan
rate.
The external clock source must not exceed 1MHz or the maximum available scan rate. The maximum
scan rate is determined by channel count, channel type (SSH) and multi-channel trigger configurations.