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4-20 IM 760301-01E

Explanation

The measurement period is determined by the data update rate and the synchronization

source specified by carrying out the procedure in this section. For details, see appendix 6.

During normal measurement, the numeric data is measured/computed from the data

sampled within the measurement period.

• Display Position of the Target Element and Synchronization Source

The target element and the synchronization source are displayed in the upper right

corner of the screen when SYNC SOURCE is pressed.

Target element (displayed as 1-4 when all elements are selected collectively)

Synchronization source (example in which

the current of Element 1 is specified)

• Selecting the Target Element to Be Specified

Only the indicators of installed elements illuminate sequentially. When the independent

setting of input elements is OFF, the element switches according to the wiring system.

All elements can also be selected collectively.

• Setting the Synchronization Source

You can select which input signal will be the synchronization source (the zero-

crossing point of the input signal to which the measurement period is synchronized)

for each element or all elements collectively. Select the signal to be the

synchronization source from the choices below. The selectable items vary depending

on the installed elements.

U1, I1, U2, I2, U3, I3, U4, I4, Ext Clk (external clock), and None

Note

If you specify no synchronization source by selecting “None,” the entire sampled data within the data

update interval is the data used to determine the numeric data. When measuring DC signals, this

method can be used to prevent errors in the detection of the measurement period caused by noise.

• When Setting the Synchronization Source to Ext Clk

Apply a clock signal to the external clock input connector (EXT CLK) on the rear panel

according to the following specifications.

EXT. CLK

• Ext Clk Specifications

Item Specifications

Connector type BNC connector

Input level TTL

Input waveform 50% duty ratio rectangular wave

CAUTION

Applying a voltage outside the range of 0 to 5 V to the external clock input

connector (EXT CLK) can damage the instrument.

4.7 Setting the Measurement Period

YOKOGAWA wt3000 User Manual

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