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...4 CONFIGURATION
...4.6.1 Recording Channel Setup
When 'Configuration type' is set to 'Advanced' (see Section 4.4.1), 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.
•1 If this parameter is changed, internally recorded data files are recreated and unarchived data is lost.
74
Set the Primary sample rate to between 0.1 seconds and
•1
A
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 3 for full details of internal
memory and external archive media storage capacity.
S
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Notes.
• 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.
• If 'Configuration type' is set to 'Advanced' (see Section
4.4.1), 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
•1
A
720 minutes (12 hours).
Select a signal source to enable switching between the
•1
A
primary and secondary sample rates. Refer to APPENDIX 1
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.
Secondary
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5
7 .
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1
5 .
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1
1 .
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2
3 .
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Primary
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