Fluke 8502A User Manual

8500 Series

604-1.

604t

permits

the accuracy

entered into memory factors are determined bV comparison

cardinal +1.000000V

range . A non-volatile

factors for

conrplet

604-3.

604-4.

the

rnaintained the instrumcnt.

604.5.

601-6.

Installation

The interconnect diagranr

listing

604.7.

604-8.

care high

switch

factor for that

enter an

enter calibration

1.

2.

469684

TNTRODUCTTON

. Installation

c.rtcnded calibration

of the instrument. A calibratiotr

point

for each

dc would

at least one

ely recalibrated.

SPECIFICATIONS

Zero.

DC

cardinal

INSTALLATION

Ref-er to Section

pernrissible

OPERATING

When the Calibration

nrust be

resolution

while in

erroneous

Ensure

durcs

Verify that

are extinguished.

Ohms

points

for

ieast one

at

and Removal

and

exercised

mode .

the higli

function and

factor.

factors.

that the

have been

of' the

Calibration

intervals

with a single

function and range. An input

be the

cardinal

memory allows storage

year

or until

Zero, and

of every range and

year

with no

4 of this ntanual

for installaticln

in

Section

pref'erred

when using

Inadvertently

the

slots.

NOTES

Mernory module

resolution

range

Use the

Zero and Ohms

DC

pertbrmed.

EXT REF and OFFSET

Memory tnodule

while rnaintairring

I'actor is

keystroke. Calibration

to a standard

point

for the 1V dc

at the

of calibration

the instrument is

calibration

factors

function will be

power

applied

under-Module

procedures.

8 contains a table

installed.

is

the instrument

depressing

niode will

from memory

following

in

the STORE

the

erase

procedure to

proce-

Zero

indicators

for

the

cal

and

of

tcr

Calibration

3. Selcct the Cal

4. Select

5. Apply an input

6. Depress

7.

8.

9.

Correction

rms

reading in dc cctupled ac.

604-9.

604-10. The volatile read/write

and

stants

functions

entered) is broughl out by

was

lbr

storage

function or range

new

frorn

read troller module.

the desired function and range.

tlie value of the cardinal

seiected

range

+

10.000000V

the

STOI{E switch.

shor"rld be

listed Repeat

tion and

Depress

uncorrected

equal to the value of tlie input

specil'ication as

steps

range.

the RECALL

reading taken while in the Cal Mem-

ory nrodc. The rcading is displayed

is released.

switch

'fo

renrove Calibration

use tl.re foregoing

ory,

use a short

input

feature

THEORY

Calibration

dc

and

are selected,

within the controller and stored

(an

terminals

NOTE

Jarlors

automatically

OF

meurory

ohnls

Option

Memory

(CAL

rnode

li-orn

(e.g.,

dc).

4, 5

and 6

open fbr current

instead

entered

OPERATION

Menrory rnodule

zero f-actors. When the dc

the appropriate

is

selected. calibration

fbr

irnntediate

indicator illunrinated).

a

calibration

point

with l0V dc

long

as

for

switch

factors frorl the Cal Mern'

procedure,

of' the

.for

sourcc

the function and

at

selected apply

The reading displayed

the switch is heid in.

each applicable

to display the

exccpt

factors) at the

calibration

V

the

ac

correct any

provides

used to

calibration con-

store

zero factor

ihe instrunrent controlier

tnodule. Likewise.

use within the con-

-04

equal tt.r

1

until the

in step

sourcc.

or

ohms

(if

when a

constants

604-i

thc

funcr-

last

5

non-

one

are

8500 Series

604-ll.

one instrument. so

which

The following discrrssion

604-1 .

604-12. 604-13.

This rnodule

not uscd in this

are

RAM Location

R.AM location addresses

Memorv module on

Address

and U14-12. Outputs the RAMs that data

604-14. 604-15.

are true

and

ory first requires an address

(lD

IC

I

2, 6 clocks

,

Write

Addresses used in both read and write

of 7 codes in

-l

four

low to

5,

0. 3.

6 high.ID

was designed

there are lancl

particuiar

is keyed to the schemalic,

Addresses

the instrurncnt

the

data

I'rom tI23 deterrline the

will be wlitten

Operation

wliich thrce lC

obtain a response. Writing data into ment-

(IC3,4,5

1,2,4,7 loiv) to set thc circuitry

into tl.re write mode. The addrcss is decoded

U14-l

ANDed by

by 1124-1

are

ANDed by U2-11

and to set

Ql)

rnodule is

U24-1

3,

Ul2-2 low

now set into

604-16. The next address

Ul5-6.

one-shot nrultivibrator, Ul-4,

Ul4-13 ANDed by Ul3-10

VA2'WRITij is true

write

the

outputs

RAMs accompanies

ory location

rnode.

U12-l is high

of

the

previously

of the addrcss. VA2

U12-2 high, which sets thc module into

604-17.

604-18.

into the write rnode. Read

resulting in is low

U2-4 is high sctting the

The desired nremory location nrusi have been clocked

U23

604-1

Read

Operations

The

module stays

VA2

as

(READ).

prior

Ul-3

to the READ address.

9. TROUBLESHOOTING

tll3-3

ANDed

produce

to

the

(low)

RAMs

this

address and

clocked

goes

previously

goes

RAMs

(VAl).

by U l3-4

(WRITE)

write

(1C0.2.6

which

so

(OD).

high

in

operations requirc thc rddress

low

f'or use in more

patterns

are sent

attd sonte

instruttterrt

to tl're Caliblation

data bus.

into Ul3 through

devices

on thc

Figure

ID0-7.

U I

location in

or rcad.

operations

lines

must be

high) and a data

by Ul-5-9,

T'l.re data kcy is decoded

(KEY).

VAI

arrd

the ACK response

through U25 10. The

rnode.

high) is

(VA2).

U2-5,6 are both

so

the RAMs into the

scls

U2-3 is high

Data to bc writte rr

is

storcd

decoded by

V42 triggers a

low and

which disables

irtto the

in the

into U23. At terrnination

clocking

thc read

explained. This f irnc enabling the RAM outputs.

(Ri$'i

LJ12-l lorv and

the read nrodc.

unless

nrode

ilto the read mode.

than

pcb.

-l

5

high

kcy

KIY

(Ui7,

rnetn-

set

Llll-1

into

fbr

cardinai

rected reading lcsults

recall

cal

604-2 l.

nrine if

value

feature.

constant

T'he threc

the

(lalibration

1. Store

recall the

0.

2. Store cardinal

then recall

3.

Remove

the selected

in the

fairly easy to determine

it is

is stored.

l'ollowing

Me

rnory

zeros fbr

zero

power

all

values.

points

f'or the last uncorrectcd rcading.

for two or nittre

stored constant.

checks

tunctions and rlnges,

for all

that the RAMs have dischargcd

level), then reapply

This checks

Vcc to

of C7 is

whioh

601-22.

Calibration

analysis approach

604-23.

604-21.

Table 604-1 lists

PARTS Table 604-3

battery

to rcrnove

scrarnble

can

Memory rnodule. Table 60.1 2

to troubleshooting.

LIST

Calibration Memory

manual

TP1

-fP2

TP3

TP4

TP5

TP6

TP7

for

ordering

logic return,

Vss;

-

VA2. READ;

--

.

VA2

-

SYMPTOM POSSIBLE

WR

RAM Supply

Negative Battery

Vcc; Logic

acknowledge

ACK;

and use

Table 604-1. Test

low ory

low f

ITE;

ory

push

Voltage; when

Supply

604-2.

Table

power

the

of RAM

shift

back to

and

glitches

entrie s stored in

the test

gives

a

rnodule. Ref'er

code

use

for

goes

Terminal

return

as LO

controller to

the

low 3 or 4 times every 200

controller to write

or the

low 4

power

when

signal returned when

Symptom

into the last uncrtr-

range

By using the

if a reasonable

may be rnade

hottrs

C7 to

power

Vcc.

properly.

The

is functioning

functions arrd ranges.

and recall as in 1 and

in the RAM supply

RAM.

points found on the

gives

parts

breakdown

to

Section

information.

Points

for

instrument

test

read f rom cal mem-

into cal mem-

f

or every

times

is

is off = battery

Analysis

STOR

on =Vcc

module addressed

FAILURE

to deter-

(to

ettsure

the battery

l'ront

supply

purpose

a

symptonl

ibr

5

of

msec

E

s

.6V

voltage

then

2.

the

this

604-20.

apparent

rnost

recall feature may be

Problenrs

problems

comrnon

storcd correction

rnultipliers, thc

quenily

difTicult

in the Calibratiori

in all

prclblerr

used

factor.

value wiil irc

stored

to display nrcaninglully.

last uncorrected reading

mode, 604-2

the RECALL switch is depressed.

and

Metttory

functions o1'lhc

jnsirurnent.

is wrong valucs

delernrine

kr

Since correctioti

thc

to one attd consc-

closc

is displayed wlren

causc

can

The

entcred. The

of the

value

tactors

are

Instead. the

in the

Dividing

CAL

thc

Won't

Store

Won't Read

Error

Wrong Readings

Turn-On

at

'WRITE

VA2

'

VA2

READ

Battery voltage bad RAM defective, not reading

(RAM

U23

RAM defective,

missing;check TP3 missing;check TP2

TP4,

at

address

latch),

wrong

data stored

8500 Series

REF

DESIG

OR

ITEM

NO.

BT1

BTI

C2

C3

C4

CALIBRATION

o

Figure: 60zl-1

Battery

not installed

Battery Lithium

Battery U9, U2l

Cap, Tr,

Cap,

DESCRIPTION

Lithiunr

)

Ni-cad

P/N

408757

0.47 uF

mica,

180

Ta, 0.33 uF

Table

MEMORY

(use

whe

(see

above)

(use

wlien

are

!20%,35Y

pF

5%, 500V

t

+201(,,35V

Calibration

604-3.

ASSEMBLY

n RlO & CR4 are

R20, CR4 and

installed)

Memory

FLUK STOCK

NO.

408286

448498

4 I 2890

3219

l6l

284786

408690

Assembly

E

MFG FED

SPLY

CDE

89536

89s36

0600

-56289

1)136

56289

MFG PART.

NO. OR

4082i16

448498

PPS]092

I

r 96D474X0035

l.lAl

DM I5F

lc)6D334X0035

HAI

TYPE

18I

USE

REC

TOT

OTY

CDE

G

H>

I

J

I

C5

C6

C]

CRI.

CR2 CR4

Qr

Q3

Q4

Qs

R1

R2, Rr I R4 thru

R8, Rl2, Rl

5, Rl6,

R2l, R22,

R25

R24,

Cap, Ta,

Cap, rrrica, 390

Cap, Ta, l0

Diode

Diode,

when

Xstr, Si,

Xstr,

Xstr. Si,

Res,

Res. Res,

I uF

pF

Hi-speed switching

P/N408757

PNP

NPN

Si,

FET,

N-channel

PNP

dep, 150

car.

dep, 47k

car, car, dep,

!20%,35V

+

pF

5%,

+

20%,15V

installed)

+5%,,

!57o,

+5%,,

l00k

500V

(use

I

l4W

I

l4W

1l4W

with U9,

U2

9l

l6l

148431

93623

I

20-3323

203313

226290

r68716

370012

t9597

343442

348896 348e20

9

-56

2 89

l96Dl0-sx003-s

I

JAI

l21

56289

36

DMI5F391J

960

I

I 06X

I

00r 5KA I

07910

07er0

0471-l

895.16

5.16

89

4

041

8003 I

800-l I

I N4448

r N4448

MPS3640

168716

310072

t3

2N3906

CRl5l-.15Pl5lT

cRt5l

('ii:5

-45P4737

-45P

I

I 0l T

3

REF

I

ll

R9

Rl0

Rl3

Res, mf, Res, nrf, Res, rnf,

10k

l%, l/8W

l

l30k + l%, l/8W

+

34k

l%, I

l8W

l 68260

22t618

I 602

26

;i::i

MFFl-81002F

MFF r-8 r 303F MFF r-83402F

604-3