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5.

Apply power

to

the system. The system should perform

its

normal tum-on sequence and both

scanners should center

themselves.

Check the voltages

at TPl to

ensure that the scanners

are

somewhat near

the

center

of the

field. (Within

~1 voh.) If the

scanners have

not yet

centered,

tum

R25

and

R28

CW a

little more while carefully watching

the

oscilloscope

for

any erratic behavior. Ensure that the servo loop

is

slightiy

"stiff' by

attempting

to

move

the

mirtor. Touch

the

mirtor only

by the

edges

to

avoid fingerprints.

The use of

finger cots

is

highly recommended. When the servo

is stiff, the

mirror will resist slight efforts

to

move

it,

and center again when released. Once this

is

obtained, continue on to the next step.

**Caution!! If at this time

a

load buzzing

or

whining noise

is

heard from

the

scanners, shut

off

the power immediately.

Tum R28 CCW one

fiill

tum and try

applying power again.

If

the

system

is

still

not

behaving well, start over

at

step

1

again using less tums

for the

initial

adjustment

in

step

3.

above. If the system cannot

be

made

to

work, call Cambridge Technology

for assistance.

Input a square wave signal

at a

frequency

of 30Hz. Set the amplitude to produce about

2°

p-p

of scanner shaft motion.

The

exact

amount

is not

important

as

long

as the

motion is small.

7.

Tum R31 CW

very gradually until

a

waveform similar

to

figure 1

is

obtained

The tiimpot will have

no

effect

the

first

one

or two

tums, then

it

will begin

to

have effect. Continue

to tum the

trimpot

CW until

the

oscillations just

die out

before

the

next half cycle

of the

input

signal.

Figure

1.

8. Tum

R28

CW until the first overshoot

is

minimized, i.e.

at

the same amplitude as the settled

position. See Figure

2.

9.

Tum R25 CW the

first undershoot

is

minimized,

i.e. at the

same amplitude

as the

settied

position. See Figure 3.

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