YOKOGAWA WT500 - Page 312

14-11
IM 760201-01E
Specifications
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14
App
Index
Frequency Measurement
Item Specifications
What is measured Up to two of the voltage or current frequencies applied to an element can be selected and
measured. On models with the frequency measurement add-on option, the voltage and current
frequencies of all elements can be measured.
Measurement method Reciprocal method
Measurement range
Data Update Interval Measurement Range
100 ms 25
Hz≤f≤100kHz
200 ms 12.5
Hz≤f≤100kHz
500 ms 5
Hz≤f≤100kHz
1 s 2.5
Hz≤f≤100kHz
2 s 1.5
Hz≤f≤50kHz
5 s 0.5
Hz≤f≤20kHz
Accuracy ±0.06% of reading
When the input signal level is 30% or more of the measurement range (0.5 to 440 Hz; frequency
filter on), or for external current sensor input, when it is 25 mV or more. When the input signal is
less than or equal to two times the frequency lower limit written above, and when it is greater than
or equal to 50% of the measurement range. Add 0.05% of reading when the external current sensor
input is 50 mV or less. Double the input signal level values when the crest factor is 6.
Display resolution 99999
Minimum frequency
resolution
0.0001 Hz
Frequency measurement
filter
Frequency filter (see section 14.1)
Integration
Item Specifications
Modes Manual, normal, continuous, real-time normal, and real-time continuous
Measurement functions See section 14.3 for details.
Integration timer Integration can be stopped automatically by a timer that can be set to:
0000h00m00s to 10000h00m00s
Count overflow When the maximum integration time (10000 hours) is reached or when an integrated value reaches
the maximum or minimum displayable integrated value,
*
the integration time and value at that point
are held and integration is stopped.
* WP:
±99999 MWh
q: ±99999 MAh
WS: ±99999 MVAh
WQ: ±99999 Mvarh
Accuracy Power: ±(power accuracy + 0.02% × WS)
Current: ±(current accuracy + 0.02% of reading) if a value other than dc is selected
±(current accuracy + 0.02 × integration time (h)% of range) if dc is selected
However, there is approximately 70
µ
s of unsampled space in each data update interval.
Timer accuracy ±0.02% of reading
14.6 Functions