Videographic Recorder
SM1000
4 Configuration
62
IM/SM1000
Issue 11
The instrument can be configured to sample all recording channels in the group simultaneously and store the data in internal memory
and external archive media (if archiving is enabled) at two rates, Primary and Secondary.
The Primary sample rate is active during normal process operating conditions and is set typically to a relatively slow rate (depending
upon process recording requirements) in order to maximize internal memory and external archive media capacity.
The instrument can be configured to switch to a faster, Secondary sample rate when a selected digital source becomes active in
order to record the maximum amount of detail for the period in which that source is active, or may be switched manually – see
Section 3.4, page 32.
Set the Primary sample rate to between 0.1 seconds and 720
minutes (12 hours). The table below compares example sample
rates with the equivalent chart speeds of a traditional chart
recorder together with the storage capacity of internal memory.
Refer to Appendix C, page 116 for full details of internal memory
and external archive media storage capacity.
Sample Rate
Equivalent Chart
Speed
On-board Storage
Time (6 Channels)
1 second
720mm/h
22.7 hours
3 seconds
240mm/h
2.8 days
6 seconds
120mm/h
5.7 days
12 seconds
60mm/h
11.5 days
36 seconds
20mm/h
1.1 months
72 seconds
10mm/h
2.3 months
Note.
Sample rates are set using one of the following
combinations of units:
–
Minutes or minutes and seconds
–
Seconds
–
Tenths of seconds (
minutes and seconds must first
be set to zero
).
The rate at which data is displayed in the Chart Views is
set separately – see 'Screen interval' in Section 4.5.2,
page 65.
The fastest sample rate setting determines the maximum
screen interval that can be selected – see Table 2.1 on
page 12.
Set the Secondary sample rate to between 0.1 seconds and
720 minutes (12 hours).
Select a signal source to enable switching between the primary
and secondary sample rates. Refer to Appendix A, page 104 for
a description of the available sources.
Note.
This signal is edge-triggered. A rising edge (inactive to
active) switches to the secondary sampling rate. A falling edge
(active to inactive) switches to the primary sampling rate.
•1
If this parameter is changed, internally recorded data files are recreated and unarchived data is lost.
1
1
1
Primary
Secondary
