Atec Yokogawa-WT500 - Manual (Page 2)

WT500 SPECIFICATION
Total power error with
respect to the range for
an arbitrary power
factor
λ (exclude λ = 1)
Influence of line filter
Lead/Lag Detection (d
(LEAD) /G (LAG) of the
phase angle and
symbols for the reactive
power Q
∑ calculation)
* The s symbol shows
the lead/lag of each
element, and "-"
indicates leading.
Temperature coefficient
Effective input range
Max. display
Min. display
Measurement lower
limit frequency
Accuracy of apparent
power S
Accuracy of
reactive power Q
Accuracy of power factor
λ
Accuracy of phase
difference Ø
One-year accuracy
–
When cutoff frequency is 500 Hz
"45 to 66 Hz: Add 0.2% of reading
Under 45 Hz: Add 0.5% of reading"
When cutoff frequency is 5.5 kHz
"66 Hz or less: Add 0.2% of reading
66 to 500 Hz: Add 0.5% of reading"
When λ = 0
Apparent power reading ϫ 0.2% in
the 45 to 66 Hz range
All other frequencies are as follows
(however, these are only reference
values):
Apparent power reading
ϫ
(0.2 + 0.2 ϫ f (kHz))%
0 < λ < 1
(Power reading) ϫ [(Power reading
Error (%)) + (power range error (%) ϫ
(Power range/Apparent power
reading)+power reading
ϫ {tanØ ϫ
(influence when λ = 0%)] Ø is the
phase difference of voltage and current
When cutoff frequency is 500 Hz
"45 to 66 Hz: Add 0.3% of reading
Under 45 Hz: Add 1% of reading"
When cutoff frequency is 5.5 kHz
"66 Hz or less: Add 0.4% of reading
66 to 500 Hz: Add 1.2% of reading"
The phase lead and lag are detected correctly when the voltage and current
signals are both sine waves, the lead/lag is 50% of the range rating (or 100%
for crest factor 6), the frequency is between 20 Hz and 2 kHz, and the phase
angle is
±(5° to 175°) or more.
± 0.03% of reading/°C at 5–18° or 28–40 °C.
Udc and Idc are 0 to
±110% of the measurement range
Urms and Irms are 1 to 110%* of the measurement range (or 2%–220% for
crest factor 6)
Umn and Imn are 10 to
±110% of the measurement range
Urmn and Irmn are 10 to ±110%* of the measurement range
Power is 0 to ±110%* for DC measurement, 1 to 110%* of the voltage and
current range for AC measurement, and up to ±110%* of the power range.
However, the synchronization source level falls below the input signal of
frequency measurement.
110% of the voltage range rating.
140% of the voltage and current range rating
Urms, Irms, Uac and Iac are up to 0.5% relative to the measurement range (or
up to 1% for a crest factor of 6).
Umn, Urmn, Imn, and Irmn are up to 2% (or 4% for a crest factor of 6).
Below that, zero suppress. Current integration value q also depends on the
current value.
Voltage accuracy + current accuracy
Accuracy of apparent power
+ ( (1.0004 –
λ 2 ) – (1 – λ 2 ) ) ϫ 100% of range
±[ (λ – λ/1.0002) + |cosØ – cos {Ø + sin -1 (influence of power factor of power
when λ = 0%/100) } | ] ±1digit when voltage and current is at rated input of the
measurement range. Ø is the phase difference of voltage and current.
±[ |Ø – cos
-1 ( λ/1.0002) | + sin -1 { (influence of power factor of power when
λ=0%) /100 } ] deg ±1digit when voltage and current is at rated input of the
measurement range
Add the accuracy of reading error (Six-month)
ϫ 0.5 to the accuracy six-month
Voltage/current Power
Data update rate
Measurement lower
limit frequency 100 ms 200 ms 500 ms 1 s 2 s 5 s
25 Hz 12.5 Hz 5 Hz 2.5 Hz 1.25 Hz 0.5 Hz
Store function
Internal memory size Approximately 20 MB
Store interval (waveform OFF) Maximum 100 msec to 99 hour 59 minutes 59 seconds.
Guideline for Storage Time (Waveform Display OFF, Integration Function OFF)
Number of
measurement
channels
1 ch
1 ch
3 ch
3 ch
Measured Items
(Per CH)
3
10
10
20
Storage Interval
100 ms
1 sec
100 ms
1 sec
Storable Amnt. of Data
Approx. 40 hr
Approx. 120 hr
Approx. 4 hr
Approx. 20 hr
Note: Depending on the user-defined math, integration, and other settings, the actual
measurement time may be shorter than stated above.
Store interval to memory depends on number of stored data and kind og the media
Functions
Integration
Added Frequency Measurement (/FQ Optional)
Select up to two frequencies of the voltage or current input to
the input elements for measurement. If the frequency option (/
Display
60000
Select 4, 8, 16 matrix, all, single list, or dual list.
501
Peak-peak compressed data
Range from 1 ms – 500 ms/div. However, it must be 1/10 th of
the data update rate.
Approximately 100 ks/s
Edge type
Select Auto or Normal. Triggers are turned OFF automatically
during integration.
Select voltage, current, or external clock for the input to each
input element.
Select (Rising), (Falling), or (Rising/Falling).
When the trigger source is the voltage or current input to the
input elements. Set in the range from the center of the screen
to
±100% (top/bottom edge of the screen). Setting resolution:
0.1%
When the trigger source is Ext Clk, TTL level.
Voltage and current input to the waveform vertical axis zoom
input element can be zoomed along the vertical axis.
Set in the range of 0.1 to 100 times.
ON/OFF can be set for each voltage and current input to the
input element.
You can select 1, 2, 3 or 4 splits for the waveform display.
Select dot or linear interpolation.
Select graticule or cross-grid display.
Upper/lower limit (scale value), and waveform label ON/OFF.
When you place the cursor on the waveform, the value of that
point is measured.
No time axis zoom function
Vector display of the phase difference in the fundamental
waves of voltage and current.
Displays the size of each harmonic in a bar graph.
Displays trends (transitions) in numerical data of the
measurement functions in a sequential line graph.
Two windows can be selected (from numerical display,
Not available
Digital multiplication method
3 or 6 (when inputting rated values of the measurement
range), and 300 relative to the minimum valid input.
Interval for determining the measurement function and
performing calculations.
Period used to determine and compute the measurement
function.
• The measurement period is set by the zero crossing of the
reference signal (synchronization source) (excluding watt
hour WP as well as ampere hour q during DC mode).
• For harmonic measurement (/G5 option), the measurement
period is from the beginning of the data update interval to
1024 points at the harmonic sampling frequency.
You can select one of the following five wiring settings.
1P2W (single phase, two-wire), 1P3W (single phase, 3 wire),
3P3W (3 phase, 3 wire), 3P4W (3 phase, 4 wire),
3P3W(3V3A) (3 phase, 3 wire, 3 volt/3 amp measurement).
However, the number of available wiring settings varies
depending on the number of installed input elements. Up to
four, or only one, two, or three wiring settings may be
available.
When inputting output from external current sensors, VT, or
CT, set the current sensor conversion ratio, VT ratio, CT ratio,
and power coefficient in the range from 0.0001 to
99999.9999.
Line filter or frequency filter settings can be entered.
• The average calculations below are performed on the
normal measurement parameters of voltage U, current I,
power P, apparent power S, reactive power Q. Power factor
λ and phase angle Ø are determined by calculating the
average of P and S.
Select exponential or moving averaging.
• Exponential average
Select an attenuation constant of 2, 4, 8, 16, 32, or 64.
• Moving average
Select the number of averages from 8, 16, 32, or 64.
• The average calculations below are performed on the
harmonic display items of voltage U, current I, power P,
apparent power S, reactive power Q. Power factor
λ is
determined by calculating the average of P and Q.
Only exponential averaging is performed. Select an
attenuation constant of 2, 4, 8, 16, 32 or 64
Select 100 ms, 200 ms, 500 ms, 1 s, 2 s, or 5 s.
At maximum, two times the data update rate (only during
numerical display)
Holds the data display.
Executes a single measurement during measurement hold.
Compensates the zero level. the range:
±10% of range
Storage
Settings, waveform display data, numerical data, and screen
image data can be saved to media*.
Saved settings can be loaded from a media*.
*USB memory
Select a mode of Manual, Standard, Continuous (repeat),
Real Time Control Standard, or Real Time Control
Continuous (Repeat).
Integration can be stopped automatically using the integration
timer setting. 0000 h 00 m 00 s~10000 h 00 m 00 s
If the count over integration time reaches the maximum
integration time (10000 hours), or if the integration value
reaches max/min display integration value (
±999999 MWh or
±999999 Mah), the elapsed time and value is saved and the
operation is stopped.
Power:
±(power accuracy + 0.02% of WS)
Current: ±(current accuracy + 0.02 ϫ elapsed time (h) % of
range) (when select dc)
±(current accuracy + 0.02% of reading) (when
selected others)
It does not sample for approximately 70
µs at each
data update. The period is compensated.
±0.02% of reading
Mode
Timer
Count over
Accuracy
Time accuracy
Device under measurement
• Numerical display function
Display resolution
Number of display items
• Waveform display items
No. of display rasters
Display format
Time axis
Sample rate
Triggers
Trigger Type
Trigger Mode
Trigger Source
Trigger Slope
Trigger Level
Vertical axis Zoom
ON/OFF
Format
Interpolation
Graticule
Other display ON/OFF
Cursor measurements
Zoom function
* Since the sampling frequency is approximately 100 kHz, waveforms that can be accurately
reproduced are those of about 5 kHz.
• Vector Display/Bar Graph Display (/G5 option is required)
Vector display
Bar graph display
• Trend display
Number of measurement channels Up to 8 parameters
• Simultaneous display
• Saving and Loading Data
Measurement method
Crest factor
Measurement period
Wiring
Scaling
Input filter
Averaging
Data update rate
Response time
Hold
Single
Zero level compensation/Null