Pulse Knob; Ripple Measurement; Input Control; Trigger Method - UNI-T UTL8500 Series User Manual

4.3.2 Pulse Knob

Before inputting parameters, there will be a default value at the cursor position. You can
use the knob to adjust the number at the cursor position, and then move the cursor until
the number on each digit is set to the needed value. You should press Enter button
again to complete the parameter setting.
Note: When the set parameters reach the upper and lower limits, the number at the
corresponding position cannot continue to scroll.

4.3.3 Ripple Measurement

UTL8500 series electronic load supports voltage ripple (Vpp) and current ripple (lpp)
measurement and real-time display. In the test interface, you can see these parameters:
Vpp/Vp+/Vp-, lpp/lp+/lp-, and you can alternately view the required parameters by using
the "Page" soft key at the bottom right.
Different from the measurement method of the traditional oscilloscope, the ripple
measurement of the electronic load has good flatness and accuracy in a certain
measurement range and bandwidth. At the same time, the ripple generally includes two
types with different frequency, power frequency ripple and switching ripple. The ripple test
result is affected by the combination and superposition of these two ripples.

4.3.4 Input Control

After the electronic load is powered on, it is in an unloaded state. You can control the input
switch of the load by pressing the ON button on the front panel.
If the indicator light of the ON button is on, it means that the input is turned on, and the
real-time voltage, current and power in the current loop will be displayed on the LCD screen.
If the indicator light is off, it means that the input is closed, and the current voltage across
the load will be displayed on the LCD screen.

4.4 Trigger Method

When using Dynamic, List or Time mode, the trigger function of the electronic load may be
used. The user can choose manual trigger (Manual) or external trigger (External).
Operation Steps:
1. In the Dynamic, List or Time mode page, you can quickly modify the trigger mode by
selecting [Trigger] through the function keys at the bottom of the screen, and the words
"Manual" or "External" will appear at the top of the screen;
2. When the external trigger is selected, the trigger signal is connected through the trigger
terminal on the rear panel to control every action of the electronic load;
3. When the manual trigger is selected, use the [Trig] button on the panel to trigger. Each
time you press [Trig] button, a corresponding trigger operation will be executed.
UTL8500 Series User Manual
38