17-6
IM 253710-01E
17.5 Functions
Measurement Mode and Wiring Method
Item
Specification
Measurement mode
Select either normal measurement or harmonic measurement mode.
Wiring method
Select one or two from 1P2W (single-phase two-wire), 1P3W (single-phase three-wire), 3P3W
(three-phase three-wire), 3V3A (three-voltage, three-current), and 3P4W (three-phase four-wire).
Motor Evaluation
This is applicable to products (PZ4000) with firmware version 2.01 or later when the
motor module is installed in the element number 4 slot.
Item
Specifications
Measurement function
Speed (rotating speed), Torque, Sync (synchronous speed), Slip, Pm (motor output or mechanical
power), motor efficiency, and total efficiency.
Data Acquisition
Item
Specification
Observation time
See section 17.3, “Time Axis”
Record length
Select the record length of the acquisition memory from 100 k-word, 1 M-word (option), and 4 M-
word (option).
Dividing record length
The acquisition memory can be divided in half. The sampled data can be acquired to each half.
Measurement range
Depends on the input module. See the specifications of each input module.
Scaling
Set the PT ratio, CT ratio, and power coefficient in the range from 0.0001 to 99999.9999 when
applying the output from an external current sensor, PT, or CT to the instrument.
Time base
External clock can be selected. See 17.3 “Time Axis” for the specifications of the external clock.
Zero level compensation / Compensates the zero level.
NULL
Frequency Measurement
Item
Specification
Method
Reciprocal method
Measured item
Normal measurement mode
Voltage and current of all power measurement modules that are installed.
Harmonic measurement mode
Voltage or current that is selected for the PLL source.
Display resolution
99999
Max. display
2.5000 MHz
Accuracy
±
0.1% of the r 1 digit
When the input signal is a sinusoid that has an observation time of 2 ms or more, 10 Hz
≤
f
≤
10 kHz
(f is the frequency), and an input level that is greater than or equal to 15% of the measurement
range; there are at least 5 periods within the observation time; and the frequency of the signal being
measured is less than or equal to (1/2.5) of the sampling rate.
Filter for measuring
Zero crossing filter
frequency