GW Instek APS-1102 User Manual - Manual (Page 66)

4.1 Use as a DC Power Source
APS-1102 Programmable AC/DC Power Source 4-2
4.1 Use as a DC Power Source
When using the APS-1102 as a DC voltage source, select DC - Internal signal mode (AC+DC-INT), then
enter the settings listed in Table 4-1.
AC components (sine wave, square wave, and arbitrary waveform) can be superimposed on the DC power
source.
A protection diode may be required to be connected, depending on the load, such as a capacitor or
inductor.
Table 4-1. Panel Settings When Using APS-1102 as a DC Power Source
Setting Setting Range Resolution Initial Value
DC voltage
100 V range 200.0 to +200.0 V 0.1 V 0.0 V
200 V range 400.0 to +400.0 V 0.1 V 0.0 V
AC voltage
100 V range
SIN/SQU 0.0 to 140.0 Vrms 0.1 Vrms 0.0 Vrms
ARB1 to ARB16 0.0 to 400.0 Vp-p 0.1 Vp-p 0.0 Vp-p
200 V range
SIN/SQU 0.0 to 280.0 Vrms 0.1 Vrms 0.0 Vrms
ARB1 to ARB16 0.0 to 800.0 Vp-p 0.1 Vp-p 0.0 Vp-p
AC voltage frequency 1.0 to 550.0 Hz 0.1 Hz 50.0 Hz
Phase when output is on 0.0 to 359.9  0.1 0.0
The unit for AC voltage settings differs according to the AC voltage waveform setting.
4.1.1 Connecting output terminal to load during DC output
Use the output terminal on the rear panel when outputting DC+AC or only DC from the APS-1102.
If the load is a capacitor or inductive load, connect a diode for protection that meets the following
specifications between the output terminal of the APS-1102 and the load.
 Maximum reverse voltage: 600 V or higher
 Maximum forward current: 15 A or more (100 V range), 7.5 A or more (200 V range)
a) Capacitive load such as capacitor (about 50 F or more) and DC-DC converter
When a capacitive load is charged, the greater the voltage changes, the more the charge
current becomes. Overshoot may be generated in the output currents depending on the load,
even if the peak current limiter of the APS-1102 operates, thus turning off the output due to
overcurrent protection.
To avoid this, gradually lower the set voltage so that decrease of the voltage changes per
certain unit time or use the sweep function of the sequence.
A block diode is required to prevent current from flowing from the load to the output
terminal of the APS-1102 even if the output voltage is lowered. Connect the diode and the
load serially as shown in Figure 4-1.