Agilent Technologies Agilent E3615A Serials KR83506197 Manual

A SERVICE OF

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A-7

e. Record output volta

g

e across Rs and convert it to

current b

y

dividin

g

this volta

g

e b

y

Rs.

f. Adjust autotransformer to the hi

g

h line volta

g

e (127

Vac for nominal 115 Vac, 110 Vac for nominal 100

Vac, and 253 Vac for nominal 230 Vac).

g

. When the readin

g

settles, record the volta

g

e across

Rs a

g

ain and convert it current. Check that the two

recorded readin

g

s differ less than 0.01% of output

current plus 250 µA.

PARD(Ripple and Noise)

Definition : The residual ac current which is superimposed

on the dc output current of a power suppl

y

. Constant current

PARD is specified as the root-mean-square(rms) output cur-

rent in a frequenc

y

ran

g

e of 20 Hz to 20 MHz with the suppl

y

in CC operation.

PARD(RMS) Measurement

Test Parameter:

Measured Variable: Output Current(rms)

Expected Results: E3614A: Less than 5 mA rms

E3615A: Less than 2 mA rms

E3616A: Less than 500 µA rms

E3617A: Less than 500 µA rms

Test Procedure:

a. Connect the test equipment as shown in Fi

g

ure A-8.

b. Turn the suppl

y

's power on and turn VOLTAGE con-

trol full

y

clockwise.

c. Turn up output current to the full rated value. Check

that the CC indicator remains li

g

hted. Reduce CUR-

RENT control if not li

g

hted.

d. Record rms volta

g

e across Rs and convert it to cur-

rent b

y

dividin

g

this volta

g

e b

y

Rs.

e. Check that the rms noise current is less than 5 mA

rms for E3614A, 2 mA rms for E3615A and 500 µA

rms for E3616A and E3617A respectivel

y

.

Fi

g

ure A-8. CC PARD RMS Measurement Test Setup

CC Drift (Stability)

Definition: The chan

g

e in output current for the first 8 hours fol-

lowin

g

a 30-minute warm-up with constant input line volta

g

e,

constant load resistance and constant ambient temperature.

Test Parameter:

Measured Variable: Output Current

Expected Results: Less than 0.1% plus 10 mA

Test Procedure:

a. Connect the DVM across Rs in Fi

g

ure A-4. Operate

the electronic load in constant volta

g

e mode and set

its volta

g

e to the full rated value of the power suppl

y

.

b. Turn the suppl

y

's power on and turn VOLTAGE con-

trol full

y

clockwise.

c. Turn up output current to the full rated value.

d. After a 30-minute warm-up, note the volta

g

e on DVM

and convert it to current b

y

dividin

g

this volta

g

e b

y

Rs.

e. The converted output current should deviate less than

0.1% plus 10 mA from the current obtained in step d

over a period of 8 hours.

ADJUSTMENT AND CALIBRATION

PROCEDURE

Adjustment and calibration ma

y

be required after perfor-

mance testin

g

, troubleshootin

g

, or repair and replacement.

Perform those adjustments that affect the operation of the

fault

y

circuit and no others. To remove the top cover, refer to

"Line Volta

g

e Option Conversion" para

g

raph.

Maintenance described herein is performed with

power supplied to the suppl

y

, and protective covers

removed. Such maintenance should be performed

onl

y

service-trained personnel who are aware of the

hazards involved (for example, fire and electrical

shock). Where maintenance can be performed with-

out power applied, the power should be removed.

Fi

g

ure A-9. Calibration Test Setup