通常情况下，电源设备的内阻抗可以起到缓冲变频器直流滤波电容的无功功率的作用。这种内阻抗就是变压器的短路阻抗。电源容量相对变频器容量越小，内阻抗值相对越大，谐波含量越小；电源容量相对变频器容量越大，则内阻抗值相对越小，谐波含量越大。所以选择变频器供电电源变压器时，*选择短路阻抗大的变压器。
Vietnam IMPERF Block 2 National musical instruments set
National Instruments SH100100 1-Meter E-Series Cable
National Instruments SCXI-1140 Simultaneous Sampling
National Instruments Analog Waveform Editor 1.1 w/Cert
NATIONAL INSTRUMENTS GPIB 232CT 488 - RS-232 CONTROLLER
National Instruments PCI-6602
National Instruments PCI-6036E 200kS/s 16-Bit DAQ Card
NATIONAL INSTRUMENTS 6036E 16 BIT MULTIFUNCTION I/O DB
National Instruments NI PCI-6527 Isolated 48-Ch I/O
VXI-1394 National Instruments
NATIONAL INSTRUMENT NI PXI-6533 32-BIT DIGITAL I/O INFC
National Instruments PXI-8331 MXI-4 Interface for PXI
Used National Instruments AT-GPIB/TNT 488.2 card
National Instruments PCI-1411 IMAQ Frame Grabber Card
NATIONAL INSTRUMENTS NI PCI-7030/6533 RT MF DAQ
