Selecting Measurements - Ametek L Series User Manual

L-Series and FCS-18- Graphical User Interface User Manual

8.1 Selecting measurements

The L-Series can provide up to nineteen parameters in case of a three
phase system or seven in case of a single phase system. Each parameter
takes a certain amount of time to obtain. If all nineteen parameters are
requested, the total measurement time can approach 5 seconds. Since not
all parameters are relevant for all applications, the user can deselect those
measurements that are not critical and thus reduce the measurement cycle
time. Also, if any parameter can be derived from other measured values, it is
calculated on the PC in software to avoid unnecessary data transfers. This
can speed up the measurement cycle considerably.
Measurements will only be taken for those parameters and on those
phases for which a check mark is present. In case of a single phase system
or a three phase system with MODE option in single phase mode, phase B
and phase C will be disabled.
If all check marks are removed, only the frequency will be measured.
Frequency measurements are always enabled and cannot be turned off.
Measurements that are disabled will retain their most recent value but will
be dimmed to indicate that they are no longer updated.
It is possible to enable and disable measurements while a measurement
cycle is in progress, but the effect of the change may not be visible until the
next cycle if the change was made after the measurement has been
displayed for the present cycle already. Measurements are made in the
following sequence. Disabled measurements and/or phases are skipped :
1. Frequency
2. Voltage phase A
3. Current phase A
4. Phase angle phase A
5. Power phase A
6. Apparent power phase A
7. Power Factor phase A
8. Voltage phase B
9. Current phase B
10. Phase angle phase B
11. Power phase B
12. Apparent power phase B
13. Power Factor phase B
14. Voltage phase C
15. Current phase C
16. Phase angle phase C
17. Power phase C
18. Apparent power phase C
19. Power Factor phase C
68 California Instruments Rev D – March 2011