Multi-Tech Systems 7500 - Manual (Page 303)

ION 7500 / ION 7600 User’s Guide Power Frequency
Power Quality: ION Meters and EN50160 Technical Note Page 303
Power Frequency Default Measurements
* This data is recorded once a week by Data Recorder module 17.
Optionally, the data below can be recorded every 10 minutes by Data Recorder 32.
Register Label Source Module Type Description
Freq N*
Signal Limit Evaluation
number of valid intervals (voltage on all phases within +/- 15% of nominal)
Freq N invld* number of invalid intervals
Freq N1* number of valid intervals in which the freq deviates from the nominal by more than +/-1%
Freq N2* num of valid intervals in which the freq deviates from the nominal by more than +4% or -6%
PO Freq N
Store
Freq N of the previous Observation Period
PO Freq N1 Freq N1 of the previous Observation Period
PO Freq N2 Freq N2 of the previous Observation Period
Freq mean-ep Sliding Window Demand average Frequency over 10s (used for display purposes)
Freq mn-op Minimum minimum mean Frequency (Freq mean-ep) over 1week (used for display purposes)
Freq mx-op Maximum maximum mean Frequency (Freq mean-ep) over 1week (used for display purpose)
Freq N1/N
Arithmetic
N1/N ratio
Freq N2/N N2/N ratio
PO Freq N1/N N1/N ratio of the previous Observation Period
PO Freq N2/N N2/N ratio of the previous Observation Period
Register Label Description
PQ Freq mean average Frequency over 10minutes
PQ Freq low minimum Frequency over 10 minutes (HS measurement)
PQ Freq high maximum Frequency over 10 minutes (HS measurement)