Page 12 - Voltech Instruments PM3300 Universal Power Analyser, designed and produced by Connell Marketing Associated, UK

Setup and Other Functions

The PM3300 provides a host of additional set up functions to meet almost every
power analysis need. These can be programmed in non-volatile memory and
recalled at will.

FREQ FREQUENCY SOURCE.
SOURCE
The measurements made by the PM3300 are synchronized to the ac
INT supply frequency.
EXT
INT mode synchronizes measurements to input voltage or current,
over the frequency range 5Hz to 1MHz. The user can choose voltage
or current for frequency measurement, which is helpful in applications
such as motor drives, where one input may be 'chopped'.

EXT mode synchronizes measurements to a signal applied to a rear
panel connector. It is used when both voltage and current are
'chopped', or for frequencies down to 0.1Hz.

BAND - BANDWIDTH
WIDTH
The bandwidth of the PM3300 can be set purposely low for certain
HIGH measurements by the application of a software compensated analogue
LOW filter.

For example: the required anti-aliasing filter for IEC555-2 measurements.

HIGH bandwidth selects the full bandwidth of the PM3300 from DC to
1MHz.

LOW bandwidth selects a low bandpass filter with unity characteristic
up to cut-off frequency and full rejection at higher frequencies.

AVG AVG.

AUTO The PM3300 will average a number of measurements to display a
N steady reading despite fluctuations at the inputs.

AUTO In this mode the instrument will average 16 measurements;
any substantial change in input conditions will automatically cancel
averaging to give a fast reponse.

N In this mode the user can force the PM3300 to average up to 64
measurements in order to provide a steady reading even when large
changes in input conditions are occuring.

COUP COUPLING
- LING
AC + DC is normally selected. The PM3300 will compute results due
to all components in the input voltage and current waveforms, including

AC+DC the dc and low frequency components.

AC configures the instrument to ac couple the input signals. This is
AC useful for examining ripple voltage on rectifier outputs and for the

calibration of other instruments that are ac coupled.

12