Appendix B

Configuration Aspects for Programmers

 

 

Measuring Modes

Overview

You can select either of two scanning modes for ChartScan, 1) Normal mode, or 2) High-speed,single-channel mode (Burst Mode).

 

 

ChartScan Measuring Modes

Mode

“Average weight”

Application

 

Setting

 

Normal

16, 32, 64, 128, or

Recommended for AC noise rejection.

 

256

 

 

1, 2, 4, or 8

Recommended for high-speed, multiple channel applications for thermocouples

 

 

and DC voltages where noise filtering is not an issue.

High-speed,

not selectable

High-speed, single channel applications for AC and DC voltage post-acquisition

single-channel

 

waveform analysis

In the Normal mode, ChartScan samples channel data at 1.92 kHz, or once every 520.83 µs. You can select the average weight (number of samples to average) to provide noise filtering, as discussed later in this section.

In the High-speed, single channel mode, ChartScan collects data in user-defined multiples of 256 samples at a sampling frequency within the range of 38.5 Hz to 20.0 kHz.

Aside from selecting ChartScan’s scanning mode, and setting the mode parameters from ChartView software (see Chapter 4, ChartView and ChartView Plus), the following commands can be used. Note that Appendix A contains more detailed information regarding these commands.

 

 

 

Mode-Related Parameter Commands

Command

Syntax

Function

M#

M#mode

Set Measuring Mode.

 

 

Options for mode are:

 

 

0

- Normal mode, and

 

 

1

- High-speed, single channel mode.

W#

W#wt

Set Averaging Weight.

 

 

Specify the number of samples to average in Normal mode, where wt is the

 

 

averaging weight. Options for wt are: 1, 2, 4, 8, 16, 32, 64, 128, and 256, with 32

 

 

being the default.

F#

F#freq

Set frequency for High-speed, single channel mode.

 

 

freq must be a value for Hz such that 38.5 < freq < 2000. The default is 2000

 

 

Hz.

 

 

 

Y

Ypre,post,stop

Set Counts or Select Blocks.

 

Or

In Normal mode - This command is used to set acquisition counts where pre is

 

the pre-trigger count, post is the post-trigger count, and stop is the post-stop

 

 

 

 

count.

 

Y0,count,0

In High-speed, single channel mode (burst mode) the post position serves as

 

count. count is used to select the number of 256 sample blocks to be collected.

 

 

 

 

Options for block count are dependent upon system memory as follows:

 

 

256Kbytes, count value allowed is: 2 to 512

 

 

1 Mbyte, count value allowed is: 2 to 2048

 

 

4 Mbytes, count value allowed is: 2 to 8192

 

 

8 Mbytes, count value allowed is: 2 to 16384

 

 

Note: In each case the number assigned for block count must be a power of 2.

U16

M#modeF#freqW#wt

Query the Measuring Mode.

 

 

This command queries the following three parameters: M#, F#, and W#.

 

 

 

U17

U17

Return RMS.

 

 

This command computes and returns the root mean square (RMS) value of the

 

 

last completed high-speed, single-channel mode acquisition.

ChartScan User’s Manual

B-3

Page 191 Page 193
Page 192
Image 192
Omega Vehicle Security 1400 manual Measuring Modes, U16, U17
Page 191 Page 193

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