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INSTRUCTION

 MANUAL

 

-

 

MODEL

 

DLP

 

400-5-750A

 

8

this

 

type

 

of

 

test,

 

it

 

would

 

be 

necessary to

 

reset

 

the

 

load 

each

 

time 

the power

 

supply 

voltage

 

was

 

changed 

in

 

order 

to 

maintain

 

the

 

full

 load

 

current.

 

Accordingly,

 the

 

following 

procedure

 

should

 

be

 

used:

A. 

With 

the

 

load

 

adjustments

 

turned

 

counterclockwise, 

and

 the DC 

load

 

switch 

off,

 

and

 the 

Dynaload 

meters

 

in

 

their

 

maximum

 

voltage

 

and 

current

 

positions,

 

switch 

the

 

mode

 

selector

 switch 

to

 

the

 

constant

 

amperes position,

 

0-1A.

B. 

Turn 

on

 

the

 

power

 source

 

and 

the

 

Dynaload,

 and set

 

the

 

power 

source

 

to

 

the

 desired

 

output 

voltage 

(assume 

100V)

.

C.

 

Turn

 

the

 

coarse 

and

 

fine

 

DC

 

load

 

adjusts

 

until 1A 

of

 

load 

current

 

is

 

achieved.

The power

 

supply

 

may

 

now

 be 

programmed

 

from

 

50-200V, 

and the 

load 

current will be

 

maintained

 constant

 

at 

1A.

This

 

constant 

current

 characteristic

 is

 

maintained 

down 

to 

approximately

 15 

volts.

It

 should 

be noted

 

that many

 

solid

 

state

 

power

 

supplies 

are 

designed

 

for

 short

 

circuit

 

protection by

 

internal

 

current

 

limiting

 and

 

bendback, 

and

 

therefore,

 

may

 

not

 start

 

up

 

into 

a

 

constant 

current

 

type 

of

 

load.

 

Accordingly,

 the

[ELE400-5-75QA]

Summary of Contents for Dynaload DLP-400-5-750A

Page 1: ...TDI Transistor Devices Dynaload Model DLP 400 5 750A Operator s Manual MAY 1988 DYNALOAD DIVISION 36A NEWBURGH ROAD HACKETTSTOWN NJ 07840 Phone 908 850 5088 Fax 908 850 0679...

Page 2: ...E MODE 6 AMPS VOLT 3 2 1 CONSTANT CURRENT MODE 7 3 3 EXTERNAL MODULATION 9 3 4 PULSE MODE 10 3 5 SHORT CIRCUIT 10 3 6 CONSTANT VOLTS MODE 11 3 7 POWER RATING 11 3 8 PROTECTIVE CIRCUITS 11 3 9 SPECIAL...

Page 3: ...S 18 5 2 0 01A V MODE 19 5 3 0 03A V MODE 20 5 4 0 1A MODE 21 5 5 0 5A MODE 21 5 6 VOLTS 22 5 7 EXTERNAL MODULATION MODE 22 5 8 PULSE 23 5 9 SHORT CIRCUIT 24 5 10 CURRENT LIMIT POWER LIMIT PROTECTION...

Page 4: ...mps volt or may be switched to a constant current load characteristic current regulated at a pre selected value or a constant voltage type of load similar to a battery or a zener diode Provisions are...

Page 5: ...ust Constant current 0 5A as determined by the front panel load adjust Constant voltage load In this position the load is similar to a battery being charged or a constant voltage zener diode no curren...

Page 6: ...this switch should be opened NOTE WHEN TESTING LOW CURRENT SOURCES IT MAY BE ADVISABLE TO USE AN EXTERNAL FUSE OR CIRCUIT BREAKER TO PROTECT THE SOURCE CAUTION THE METER RANGE SELECTOR SWITCH SHOULD A...

Page 7: ...of source to be tested E Minus load connect to minus terminal of source to be tested TB1 1 0 to 6V programming voltage input TB1 2 Programming voltage return internally connected to the minus terminal...

Page 8: ...standard 115V 50 60 Hertz power source optional input voltage ranges are available F Connection the source to the load terminals of the Dynaload E and E on the rear of the unit Two terminals are prov...

Page 9: ...tation may be used to obtain further accuracy and eliminate the effects of leakage currents in the Dynaload or line voltage drops at high currents 3 1 CONSTANT RESISTANCE MODE AMPS VOLT Two scales are...

Page 10: ...he Dynaload or for use at very low currents There are minor leakage currents of a few milliamperes in the Dynaload instrumentation which do not pass through the Dynaload ammeter voltmeter current volt...

Page 11: ...amperes position 0 1A B Turn on the power source and the Dynaload and set the power source to the desired output voltage assume 100V C Turn the coarse and fine DC load adjusts until 1A of load current...

Page 12: ...to the negative lead of the Dynaload The Dynaload will program from 0 5A as the external modulation voltage is programmed from 0 6V if the DC load adjustments are set in the maximum clockwise positio...

Page 13: ...ntrols should be turned fully counterclockwise The maximum total of the pulse and DC load will be limited around 5 5A by the internal current limit protection 3 5 SHORT CIRCUIT The short circuit mode...

Page 14: ...not occur the rear of the Dynaload should be clear for the air intake and the air exhaust The cooling air enters and leaves from the rear The Dynaload should periodically be checked for dust accumulat...

Page 15: ...the input voltage is increased thereby limiting the maximum power which may be programmed into the Dynaload 3 9 SPECIAL APPLICATIONS The Dynaload may be used for AC load testing within its ratings by...

Page 16: ...peration particularly the external modulation function 4 2 VOLTMETER CALIBRATE A With the Dynaload set for no load place an external calibrated voltmeter across the input terminals of the Dynaload and...

Page 17: ...range selector switch at 0 6A increase the load until the external ammeter reads 0 4A E Adjust R38 so that the front panel ammeter also reads 0 4A F Switch the ammeter selector switch to 1 8A and adju...

Page 18: ...to the input terminals of the Dynaload and adjust the 03A V calibrate potentiometer R30 so that between 3 and 3 2A of load current is obtained With the Dynaload in the 0 03A V position and the load a...

Page 19: ...imum clockwise position and adjust R19 to obtain between 5 and 5 2A E Make sure that the current limit setting is not interacting in any way 4 7 EXTERNAL MODULATION A With 5VDC applied apply a 6 00 Vo...

Page 20: ...s on external meter D Adjust R72 for a reading of 500 volts on the digital meter 4 10 SQUARE ADJUST A Connect an oscilloscope to the current sample output B Set mode select to pulse mode C Adjust the...

Page 21: ...13 Rll and zener diode VR6 The 25V is regulated to 16V by constant current source QI and its associated components Rl VR5 R3 R2 and zener diodes VR2 and VR3 which generate 16V and 8V Secondary 6 7 of...

Page 22: ...hares the input voltage equally Three of the banks consisting of Q103 through Q107 Q108 through Q112 Q113 through Q117 are slave banks to the actual regulating bank consisting of Q118 through Q122 whe...

Page 23: ...esistive load The maximum voltage that can be applied to the non inverting input is limited by R24 and R54 so that approximately only 10 millamperes of current can be drawn for each volt at the input...

Page 24: ...on the inverting and non inverting inputs of U1 These two points are controlled only by the voltage reference supplied to Pin 5 and the current through the shunt which means a constant amount of curr...

Page 25: ...R17 and R18 to the inverting input of U1 replacing the current feedback loop Accordingly if the input voltage tends to exceed the voltage selected by the volts control on the front panel U1 condutcs m...

Page 26: ...rises driving the power circuit The current then rises until the voltage across the shunt is sufficient to raise the voltage at the inverting input turning U1 off If a portion of the voltage on the no...

Page 27: ...on 5 10 CURRENT LIMIT POWER LIMIT PROTECTION The voltage proportional to load current generated across SHI is applied through R7 to the base of Q3 The voltage reference generated by zener diode VR8 is...

Page 28: ...t so that at 150V input it is impossible to draw more than 6A 5 11 INSTRUMENTATION CIRCUITS Range selector switches and calibrating resistors are provided for the front panel ammeter and voltmeter 5 1...

Page 29: ...9 CRI04 PULSE ON CURRENT _ SAMPLE4 SI 12 GA UNLESS OTMERwisi SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ANGLES t FRACTIONS t 1 PLACE DECIMALS t 2 ruiCt DECIMALS t 1 PLACE DECIMALS t material SHIOI...

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