YOKOGAWA WT1800 User Manual page 95

Frequency Measurement
Item
DUT
Measurement method
Measurement range
Accuracy
Number of Displayed Digits
(Display Resolution)
Minimum frequency
resolution
Frequency measurement
filter
Integration
Item
Mode
Integration timer
Count overflow
Accuracy
Timer accuracy
IM WT1801-03EN
Specifications
Up to three of the voltage or current frequencies applied to an input element can be selected and
measured. On models with the add-on frequency measurement option, the voltage and current
frequencies of all input elements can be measured.
Reciprocal method
Data Update Rate Measurement Range
50 ms 45 Hz ≤ f ≤ 1 MHz
100 ms 25 Hz ≤ f ≤ 1 MHz
200 ms 12.5 Hz ≤ f ≤ 500 kHz
500 ms 5 Hz ≤ f ≤ 200 kHz
1 s 2.5 Hz ≤ f ≤ 100 kHz
2 s 1.25 Hz ≤ f ≤ 50 kHz
5 s 0.5 Hz ≤ f ≤ 20 kHz
10 s 0.25 Hz ≤ f ≤ 10 kHz
20 s 0.15 Hz ≤ f ≤ 5 kHz
±0.06% of reading ± 0.1 mHz,
when the input signal level is 30% or more (60% or more when the crest factor is set to 6) of the
measurement range.
The equation above holds true given that:
• The input signal is less than or equal to two times the frequency lower limit written above.
• The input signal is less than or equal to two times the frequency lower limit written above .
• The range is 10 mA for the 5 A element.
• The range is 1 A for the 50 A element.
• The 100 Hz frequency filter is on for frequencies between 0.15 Hz and 100 Hz and the 1 kHz
frequency filter is on for frequencies between 100 Hz and 1 kHz.
5 (99999)
0.0001 Hz
Select from off, 100 Hz, and 1 kHz.
Specifications
Manual, normal, continuous, real-time normal, and real-time continuous
Integration can be stopped automatically by a timer that can be set to:
0000h00m00s to 10000h00m00s
When the maximum integration time (10000 hours) is reached or when an integrated value reaches
the maximum or minimum displayable integrated value,
are held and integration is stopped.
* WP: ±999999 MWh
q: ±999999 MAh
WS: ±999999 MVAh
WQ: ±999999 Mvarh
±(normal measurement accuracy + 0.02% of reading)
±0.02% of reading
6.5 Features
*
the integration time and value at that point
1
2
3
4
5
6
App
Index
6-11