29
Setting by Field Interval
This option is designed for more experienced users. You can set the record speed
by fieldd interval. Follow the following steps to set recording speed by field interval.
1
In the “Normal Record mode” menu place your cursor in front of “Set by
Field Interval” and press and release “SET” button.
2
Set By Field Interval menu pop up on screen as shown in figure 14.
3
Place your cursor in front of Record 1 out of ----, and press and release the
“SET” button.
4
Now you can select number of fields from which you want to Record one
field.
5
Press and release the “ SET” button after you completing the Field selec-
tion.
6
Exit out of all the menu to activate recording.
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Figure 14:
Set by Field Interval Menu.
When setting the Normal Record or Alarm Mode of the QM the follow is a descrip-
tion of the functions. When you set by hour this assumes the VCR is recording a pre
determined number of pictures per second on the tape. In real time mode all VCRs
record 60 pictures per second, the NTSC standard. In the Virtual Real time mode most
VCRs record 20 pictures per second however it is possible for this to be improved in the
future. In the time lapse mode of 24 hours and above for standard density recording most
VCRs record 5 pictures per second. When using double or triple density VCRs this is
either doubled or tripled to 10 or 15 picturs per second. If you choose to set the QM by field
rate interval the same will be true only this menu breaks down the time computation to
number of fields rather than recording time. Since each field takes 17 ms to complete you
are actually programming by time also just using a multiple of 17
ms between pictures. Make sure you understand the recording pictures per second of
your VCR to issue the best performance of the QM multiplexer. To eliminate all the above
use the VCR camera switcher pulse which automatically controls the QM to record at the
best possible picture rate.
Understanding Record Timing
