Measurement Computing TempScan/1100 - Manual (Page 60)

4-2 System Configuration 879596 TempScan / MultiScan User's Manual
Memory Allocation
Each TempScan/1100 and MultiScan/1200 unit comes equipped with standard 256 KB memory. This is
expandable to 8 MB (TempMEM8 or MultiMEM8).
When expanded memory is added, the TempScan/1100 or MultiScan/1200 unit will automatically allocate
its memory for optimal use according to its current configuration. TempScan/1100 or MultiScan/1200
memory is broken into the following two main regions:
• High/Low/Last (HLL) Registers (only configured channels)
• Acquisition Buffer
When channels are configured, the TempScan/1100 or MultiScan/1200 calculates how much memory will
be needed for the High/Low/Last (HLL) Registers. The memory allocated to the HLL Registers would be
the following value –
(Number of channels) x 20 bytes – while the remaining memory would be
allocated to the Acquisition Buffer. For example, if the memory option is 256K ( 262144 bytes ) and the
number of configured channels is 96, then the amount allocated to the Acquisition Buffer would be:
262144 bytes Total Memory (256 KB)
- 1920 bytes High/Low/Last (96 x 20)
260224 bytes Acquisition Buffer Allocation (254.125 KB)
Measuring Modes (MultiScan/1200 Only)
The operation of the MultiScan/1200 unit involves two basic internal measuring modes, as follows:
• Line-Cycle Integration / High-Speed Multi-Channel (or Default) Mode. In the line-cycle integration
/ high-speed multi-channel mode, the MultiScan/1200 samples channel data at 1.92 kHz or once every
520.83 µs. You can select the number of samples over which to average in order to accomplish noise
filtering.
• Single-Channel High-Speed Burst Mode. In the single-channel burst mode, the MultiScan/1200
collects data in user-defined multiples of 256 samples at a user-defined sampling frequency between
38.5 Hz and 20.0 kHz.
The following commands are provided to setup the MultiScan/1200 for a given measuring mode.
•
M#mode : Select the measuring mode. The factory default is line cycle integration / high-speed multi-
channel mode.
•
W#wt : Select the number of samples over which to average for each channel. This is valid only in line
cycle integration / high-speed multi-channel mode. The factory default is 32 samples.
•
F#freq : Select the burst mode frequency. This is valid only in single-channel high-speed burst
mode. The factory default is 20 kHz (or 20000 Hz).
•
Y0,post,0 : In line-cycle integration / high-speed multi-channel mode, select the number of Post-
Trigger scans.
In single-channel high-speed burst mode, select the number of 256-sample blocks to acquire. The
number must be a power of 2.
•
U16 : Query the measuring mode parameters M# , W# , F# , and/or Y to verify your selections.
For more information on the above commands, see Appendix A - API Command Reference.