LOW FORWARD POWER RELAY TEST UNIT
TYPE PG250-LFP



The Convex Design PG250-LFP is a two channel (one voltage and one current output), fixed or variable frequency, low distortion AC electronic power supply with adjustable phase angle. It is particularly suitable for testing and calibrating Low Forward Power (PPX) Relays, where it is necessary to test with a pure supply waveform and a phase angle of 90° between the voltage and current vectors. However, it may be used in any application where a low distortion dual voltage/current variable phase supply is required.

The output frequency is either 50Hz crystal-controlled, or can be varied from 47 to 52Hz by means of a 10-turn potentiometer. The frequency of the output is displayed on a 5 digit LED frequency meter.

Channel 1 supplies an output voltage of 0-120V at up to 25VA and channel 2 supplies an output current of 0-5A at up to 20VA. The phase angle between the current and voltage may be set to any value in the range +99° to -99° by means of a two-digit thumbwheel switch giving 1° increments, and a potentiometer giving ±1.5° variation.

The voltage and current outputs are set using two 10-turn potentiometers and are displayed on two digital panel meters. The current output has three switched ranges with nominal outputs of 20mA, 1A and 5A.

A timing facility is included, utilising the frequency meter, having a range of 0 to 99.999 seconds with a resolution of 1mS. The timer measures the time between the current output being switched off and the contact closure of the unit under test.

The unit is housed in a two-tone grey metal case with adjustable carrying handle. Supplied complete with manual, leads and a padded carrying case.


SPECIFICATION

INPUTS
     Power Supply:               110V or 240V 50/60Hz to order.
     Timer Input:                   Two 4mm sockets - input must
                                          be from volt-free contacts.
OUTPUTS
     Channel 1:                     0-120Vrms 25VA maximum. 
                                         Output regulation less than 0.4% at 25VA.
     Channel 2:                     0-20mA, 0-1A, 0-5A in
                                          switched ranges 20VA maximum.
     Both channels
          Connectors:              Shrouded 4mm sockets.
          Frequency:               50Hz crystal-controlled, or
                                          variable 47-52Hz.
          Distortion:                Voltage Channel - Less than 0.1% t.h.d.
                                         Current Channel - Less than 0.3% t.h.d.
          Phase Shift:              -99° to +99° in 1° steps.
                                         ±1.5° continuously variable.
DIGITAL FREQUENCY METER
          Display:                    5 digit LED 14mm numeral height.
          Frequency Mode:      Three decimal places.
                                          Accuracy ±0.005Hz.
                                          Gate time 1 sec.
          Timer Mode:              0-99.999 secs.
                                          Accuracy ±2mS.
DIGITAL VOLTMETER
           Display:                    digit LED 14mm numeral height,
                                           one decimal place.
           Accuracy:                 Voltage ±0.5V.
DIGITAL AMMETER
           Display:                    digit LED 14mm numeral height
                                           reading:
                                           5.00A on 5A range.
                                           1.000A on 1A range.
                                           19.99mA on 20mA range.
           Accuracy:                 Current ±50mA on 5A range.
                                                      ±5mA on 1A range.
                                                      ±0.1mA on 20mA range.
ENCLOSURE                        A  two-tone grey metal case with adjustable
                                           carrying handle.  Supplied complete with
                                           manual, leads and a padded carrying case.
           Dimensions:              W: 525mm  H: 195mm  D: 455mm
                                           inc. handle.
           Weight:                     14kg.
NOTE:  See also the CDL Electronic Wattmeter type EW15. 

Convex Design Limited 
 
email:sales@convexdesign.co.uk
Return to
Home Page
2 & 3 Phase Power Supplies