Advanced Videographic Recorder
SM2000
4 CONFIGURATION
IM/SM2000
Issue 11
79
When 'Configuration type' is set to 'Advanced' (see Section 4.4.1, page 52), the instrument can be configured to sample each
recording channel individually 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 3.3, page 31.
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 120 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 69.
If 'Configuration type' is set to 'Advanced' (see
Section 4.4.1, page 52), available screen interval
selections are not limited but note that the time taken for
the screen to refresh in Historical Review mode is
dependent on the sample rate and screen interval
selection, e.g. fast sample rate + long screen interval =
slow refresh rate.
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 108 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
A
1
A
1
A
Primary
Secondary
