5. Crest Factor Load: (AC Load only)

Definition:

Crest factor is the ratio of the zero to peak value to the rms value of a load current wave form. This term is often used to specify the maximum peak amplitude an the AC power supply (or UPS) can source (relative to its maximum rms rating) without distortion.



Application:

Most power input circuitry (without power factor correction) consists of a rectifier diode and capacitor filter circuit, which generates a pulse AC line current. The major purpose of Prodigit AC Electronic Loads is to simulate this current wave form. Typical crest factor of the input current of a computer system ranges from 2.0 to 3.0. Prodigit AC Electronic Loads can simulate crest factor from 1.414 to 3.5 in eight steps, i.e. same RMS current with different peak current (for example, with 10A RMS load current, the peak current can be 14.14A to 35A),The Crest Factor feature can test output high peak currents.

6. Power Factor Load: (AC Load only)

Definition:

Power Factor is the ratio of average power value to the Vrms ¡Ñ Arms.
        

The following equation is true when the voltage and current wave form are Sinusoidal.



With a pure resistive load, voltage and current wave form are in phase, that is



When loads very from pure inductive through resistive to capacitive, the phase angle varies from -90¢Xto 0¢Xto + 90¢X, and power factor veries from zero to unity.



Application:

Prodigit 3260 series AC Electronic loads can simulate Inductive or capacitive loads by programming the power factor from 0 to unity. These are the first active AC loads to simulate inductive and capacitive load. All the settings are programmable via front panel or GPIB interface. The load V/A/W can be read back to computer via GPIB interface.

7. Short Circuit Load: (AC & DC Load)

Definition:

An DC/AC power supply's output terminals having very low resistance. A power supply's protection circuit should be activated to limit output current power when these conditions exist (short circuit). This is an important power supply feature as it protects equipment from damage.

Application:

Prodigit's 3310 and 3320 series DC Electronic Loads and 3260 series AC Electronic Loads can simulate short circuit conditions with a dedicated short function key. It is not necessary to have an external shorting relay to test AC & DC power supplies when using Prodigit's Electronic Loads.



Short circuit current and voltage is displayed on the front panel's digital current and voltage meters. There is no more necessary to have an external short relay to test AC & DC Power Supply when using Prodigit AC & DC Electronic Load.