User manual

UNI-T

UT4000 User Manual

I. Operating Math Functions

Math functions are displays of +, -, ×, ÷, FFT mathematical results and digital filtering

function of CH1 and CH2 waveforms. The menu is as follows :

Figure 2-10 Math functions

Table 2-2 Explanatory notes for the Math menu

Function Menu

Setup Explanatory Note

Type Math

To carry out +, -, ×, ÷ functions.

Operand 1 CH1

CH2

Set operand 1 as CH1 waveform.

Set operand 1 as CH2 waveform.

Operator +

Operand 1 + Operand 2

Operand 1 - Operand 2

Operand 1 x Operand 2

Operand 1 ÷ Operand 2

Operand 2 CH1

CH2

Set operand 2 as CH1 waveform.

Set operand 2 as CH2 waveform.

Scaling ratio 1/1

1/10

1/100

1/1000

Scale the waveform by ratio. There are four ratios to

choose from : 1/1, 1/10, 1/100, 1/1000.

FFT spectrum analysis

By using the FFT (Fast Fourier Transform) algorithm, you can convert time domain

signals (YT) into frequency domain signals. With FFT, you can conveniently observe the

following types of signals :

z Measure the harmonic wave composition and distortion of the system

z Demonstrate the noise characteristics of the DC power

z Analyse oscillation

Math ran