GSSI SIR 30, Manual

Page: 60 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 54
In this example, ALL distance ticks are ‘Major’ ticks. Ticks per Unit and Ticks per Major tick equal one.
When using these tick parameters, the scale distances are not drawn. In other cases, using a large value for
the Ticks per Unit will result in a scale that is initially readable, however as the distance increases the
distance scale becomes progressively more crowded.
Figure 81: English – 24 Scans per Foot, 5 feet per mark .Tick per Unit = Two, Ticks per Major Tick = Two.
Figure 82: English – 24 Scans per Foot, 5 feet per mark .Tick per Unit = .2, Ticks per Major Tick = two.
In Figure 64 above, the Ticks per Unit is set to 0.2. The Ticks per Major tick is set to two. This setting
results in a ‘roomy’ horizontal scale display which aligns with the distance markers on the radar data.
Note:
When operating the SIR 30 at very high scan rates, the SIR 30 will compress the display by a factor
of two (2) at 200 scan\sec increments. E.g. at 200 scans\sec the scale is compressed by two (2), at 400
scans\sec the scale is compress by four (4) and so on. The User must take this compression into account
when setting the Ticks per Unit and Ticks per Major tick.