Tektronix DM2510 Manuale

Tektronix

Product

DM2510

DM2510G

Issue

Date

May

1994

Approved

Roy

Lindley

Title

Adjustment

Procedure

REVISION

LEVEL

SUMMARY

Service

Procedure

File

Location

Service

Support

Beaverton

Del

Sta

19-083

Revision

Date

DM2510

DM2510G

Page

Revision

Level

the

origination

Level

for

this

Procedure

Level

Change

From

Revision

Level

Roy

Lindley

Initiator

Adjustment

Procedure

May

1994

Description

Revision

DM2500

DM2510G

Adjustment

Procedure

Introduction

Calibration

interval

Environmental

Conditions

Recommended

Test

Equipment

Internal

Adjustments

Preparation

for

Adjustment

Procedures

DM2510

DM2510G

Page

Contents

Introduction

Front

Panel

Calibration

Command

Sequence

Adjustment

Voltage

Accuracy

Adjustment

Resistance

Accuracy

Adjustment

Voltage

Accuracy

Adjustment

R113

(

Frequency

Comp

)

Adjustment

R121

(

stage

offset

)

Adjustment

Voltage

ranges

Adjustment

Current

Accuracy

Adjustment

Current

Accuracy

Adjustment

Temperature

Accuracy

Adjustment

Procedure

May

1994

Page

Revision

Introduction

ADJUSTMENT

PROCEDURE

Use

this

adjustment

procedure

restore

DM2510G

DM2510

the

original

performance

requirements

This

procedure

needs

not

performed

unless

the

Performance

Check

Procedure

cannot

completed

satisfactorily

the

instrument

fails

meet

the

Performance

Requirements

the

electrical

characteristics

listed

the

Specification

section

the

DM2510G

2510

instruction

manual

(

Part

No.

070-8479-00

)

Calibration

Interval

Adjustment

should

performed

the

performance

check

procedures

show

that

the

DM2510G

DM2510

out

specification

Calibration

also

recommended

following

instrument

repair

modification

Environmental

Conditions

Calibration

should

performed

under

laboratory

conditions

having

ambient

temperature

240C

and

relative

humidity

less

than

The

DM2510G

2510

must

turned

and

allowed

warm

for

least

minutes

before

beginning

the

performance

checks

After

exposure

storage

high

humidity

(

condensing

)

environment

one

hour

warm

time

required

Recommended

Test

Equipment

The

Test

equipment

listed

Table

equivalent

suggested

perform

the

DM2510G

2510

calibration

Alternate

equipment

may

used

long

the

accuracy

least

good

the

specifications

listed

the

table

DM2510

DM2510G

Page

Adjustment

Procedure

May

1994

Revision

TEST

EQUIPMENT

REQUIREMENTS

Description

Performance

Specifications

Calibration

Voltage

Range

Generator

1000V

accuracy

0.005

Voltage

Range

1000V

accuracy

0.1

20kHZ

Power

Amplifier

Digital

Multimeter

Shorting

plug

Temperature

Table

DM2510

DM2510G

Page

Current

Range

accuracy

0.1

20Hz

10kHz

Current

Range

accuracy

0.01

Resistance

accuracy

0.01

Volts

accuracy

≥

0.5

Temperature

bath

+/-

0.1

100

+/-

0.1

Used

for

Volts

Set

offset

voltage

Example

Fluke

Model

5700A

Fluke

Model

5100B

Adjustment

Procedure

May

1994

Fluke

5215A

Tektronix

DM251

Tektronix

134-0012-00

Temperature

RTE

Neslab

probe

Internal

Adjustments

The

entire

calibration

procedure

may

performed

without

having

make

any

internal

adjustments

compensation

has

been

verified

Calibration

can

performed

either

two

methods

(

)

from

the

front

panel

(

)

over

the

IEEE

488

bus

(

GPIB

)

make

internal

adjustments

you

must

remove

the

top

the

cabinet

access

the

component

side

the

main

board

All

other

calibrations

need

performed

with

the

top

the

cabinet

closed

Revision

Preparation

for

Adjustment

Disconnect

the

power

cord

from

DM2510

and

remove

the

top

the

cabinet

calibration

enable

jumper

positioned

behind

the

front

panel

the

switch

board

assembly

Place

the

jumper

the

lower

position

(

marked

CAL

)

and

set

the

cover

place

the

unit

Check

that

the

line

selector

(

the

rear

panel

cabinet

)

set

the

correct

voltage

Turn

the

power

Check

see

the

calibration

jumper

the

CAL

position

noticing

that

the

AUTO

led

constantly

blinking

Check

see

the

DMM

set

the

proper

line

frequency

(

)

Allow

the

instrument

warm

for

least

minutes

before

continuing

with

the

adjustment

procedure

(

See

Environmental

Conditions

above

)

Adjustment

Procedures

NOTE

the

following

procedure

either

the

DM2510G

the

DM2510

instruments

are

referred

DMM

The

following

steps

are

for

adjusting

the

DM2510G

DM2510

for

each

the

six

measuring

functions

voltage

TRMS

voltage

resistance

TRMS

current

and

temperature

These

procedures

are

intended

for

use

qualified

personnel

using

accurate

and

reliable

test

equipment

The

dBm

and

dBV

functions

are

recalculated

Voltage

ranges

Calibrating

the

Voltage

will

suffice

All

following

measurement

procedures

need

performed

with

the

following

settings

4.5

digit

resolution

NULL

mode

OFF

RUN

mode

DM2510

DM2510G

Page

(

Right

hand

digit

)

(

NULL

led

OFF

)

(

HOLD

led

OFF

)

Adjustment

Procedure

May

1994

Revision

}

Introduction

WARNING

prevent

shock

hazard

not

exceed

1000V

peak

between

input

low

and

chassis

ground

Some

the

procedures

this

section

may

expose

the

user

dangerous

voltages

Use

standard

safety

precautions

when

such

dangerous

voltages

are

encountered

The

DM2510G

and

DM2510

are

software

calibrated

constants

that

are

stored

EEPROM

Every

range

has

its

own

calibration

values

offset

and

gain

this

way

there

interference

between

ranges

;

calibrating

one

range

will

not

change

other

ranges

All

voltage

and

current

ranges

have

positive

and

negative

offset

value

and

positive

and

negative

gain

When

taking

measurement

the

offset

value

first

subtracted

from

the

measurement

counts

that

are

measured

the

microcontroller

The

result

multiplied

the

gain

get

the

display

value

There

GPIB

query

CALFACTOR

that

will

output

the

calibration

settings

per

range

ranges

calibration

done

and

full

scale

because

reduced

accuracy

true

RMS

converter

with

small

signals

For

the

microcontroller

able

convert

these

two

calibration

measurements

the

standard

offset

and

gain

both

measurements

need

known

For

that

reason

calibration

ranges

needs

done

specific

order

The

full

scale

calibration

needs

done

first

immediately

followed

the

calibration

that

same

range

Only

after

that

the

new

offset

and

gain

values

will

checked

and

written

EEPROM

Obviously

for

proper

calibration

both

gain

and

offset

necessary

the

offset

calibration

range

before

the

gain

calibration

DM2510

DM2510G

Page

normal

measurement

before

the

settings

read

from

EEPROM

are

used

the

firmware

compares

the

offset

and

the

gain

with

values

table

When

one

the

EEPROM

settings

range

not

within

these

boundaries

the

DMM

will

consider

that

range

uncalibrated

Adjustment

Procedure

May

1994

Revision

}

ranges

this

check

done

the

calibration

settings

the

polarity

that

used

that

moment

that

way

the

positive

measurements

range

can

calibrated

while

the

negative

measurements

are

uncalibrated

The

two

least

significant

digits

the

display

will

constantly

blink

when

range

not

fully

calibrated

this

case

able

make

measurement

the

DMM

microcontroller

decides

use

default

offset

and

gain

values

from

fixed

firmware

table

The

accuracy

the

instrument

then

reduced

about

!!!

Uncalibrated

ranges

will

only

occur

when

the

EEPROM

defective

when

the

EEPROM

(

U209

)

calibration

has

been

done

incorrectly

incompletely

Calibration

done

only

4.5

digit

mode

The

3.5

digit

measurements

are

directly

derived

from

the

4.5

digit

calibration

values

Calibration

can

done

either

50Hz

60Hz

Changing

the

setting

after

calibration

will

not

degrade

performance

Obviously

setting

the

line

frequency

the

proper

setting

during

calibration

improves

stability

and

accuracy

Front

Panel

Calibration

Command

Sequence

When

the

DM2510G

the

calibration

mode

autoranging

longer

functioning

Simultaneously

pressing

the

and

the

DOWN

Autoranging

key

now

the

command

for

the

DMM

calibrate

!!!

The

operator

warned

the

DMM

being

the

CAL

enabled

mode

the

constantly

blinking

AUTO

-led

When

calibration

command

given

the

DMM

the

micro

controller

will

automatically

determine

offset

gain

calibration

required

This

done

determined

the

input

signal

level

During

calibration

the

operator

kept

informed

about

the

status

messages

the

display

(

See

Table

)

The

calibration

command

can

also

given

over

the

GPIB

bus

(

DM2510G

only

)

GPIB

error

messages

will

then

also

indicate

the

status

enabling

full

automatic

verification

and

calibration

over

the

bus

DM2510

DM2510G

Page

Adjustment

Procedure

May

1994

Revision

Message

doNE

+0000

-0000

190.

500.

4.5

ACV

????

UnSt

StoP

1FrSt

EErr

Ⓡ

DM2510

DM2510G

Page

Table

Displayed

Calibration

Messages

Problem

and

Suggested

Action

The

DM2510G

DM2510

has

successfully

executed

calibration

step

Adjustment

Voltage

Accuracy

Positive

offset

calibration

busy

;

wait

(

Voltage

and

Current

only

)

(

Voltage

and

full

scale

calibration

command

accepted

continue

with

full

scale

value

Negative

offset

calibration

busy

;

wait

Current

only

)

100VAC

calibration

command

accepted

continue

with

500VAC

value

Select

4.5

digit

;

calibration

command

not

accepted

Select

Voltage

function

;

calibration

cannot

done

dBm

dBV

function

Input

reference

outside

firmware

boundary

settings

;

calibration

command

not

accepted

Unstable

input

during

calibration

command

not

accepted

Calibration

stopped

command

not

accepted

range

function

setting

changed

during

calibration

Calibration

command

not

accepted

the

lower

calibration

value

should

applied

first

(

only

)

EEPROM

error

;

attempt

write

new

settings

has

failed

Hardware

error

Set

the

DMM

the

DCV

200mV

range

Short

circuit

the

LOW

and

TEMP

jacks

with

shorting

plug

Press

the

DOWN

and

Autoranging

keys

simultaneously

The

DMM

will

then

calibrate

the

positive

and

negative

offset

After

writing

the

new

settings

EEPROM

the

readout

will

show

doNE

few

seconds

later

the

readout

returns

0.00mV

The

offset

calibration

the

200mV

range

now

completed

(

see

table

)

Repeat

the

steps

through

for

the

remaining

DCV

ranges

Adjustment

Procedure

May

1994

Revision

Remove

the

shorting

plug

and

connect

the

Voltage

calibrator

the

LOW

and

TEMP

jacks

Set

the

DMM

the

DCV

200mV

range

Set

the

calibrator

190.00mV

Press

the

DOWN

and

Autoranging

keys

simultaneously

The

DMM

will

then

calibrate

the

positive

gain

DM2510

DM2510G

Page

After

completion

the

calibration

the

readout

will

show

doNE

and

the

positive

gain

now

successfully

writen

EEPROM

The

DMM

display

should

now

read

190.0mV

count

Apply

-190.00mV

the

DMM

Press

the

DOWN

and

Autoranging

keys

simultaneously

The

DMM

will

then

calibrate

the

negative

gain

After

completion

the

calibration

the

readout

will

show

doNE

meaning

the

negative

gain

now

successfully

stored

The

DMM

display

should

now

read

-190.00mV

count

Repeat

steps

through

for

the

200

and

1000

Volt

ranges

according

the

settings

Table

DM2510G

DM2510

Range

Table

Voltage

Calibration

Settings

200mV

200

1000

200mV

200

1000

200mV

200

1000

Input

TEMP

LOW

Shorted

+190.000

+1.90000

+19.0000

+190.000

+1000.00

190.000

1.90000

19.0000

190.000

1000.00

Display

reading

after

Calibration

(

digit

)

0.00

0.0000

0.000

0.00

0.0

+190.00

+1.9000

+19.000

+190.00

+1000.0

190.00

1.9000

19.000

190.00

1000.0

Adjustment

Procedure

May

1994

Revision

Adjustment

Resistance

Accuracy

DM2510

DM2510G

Page

Set

the

DMM

the

Ohms

200

range

Short

circuit

the

LOW

and

TEMP

jacks

with

shorting

plug

Press

the

DOWN

and

Autoranging

keys

simultaneously

The

DMM

will

then

calibrate

the

offset

the

200

range

After

writing

the

new

settings

EEPROM

the

readout

will

show

doNE

few

seconds

later

the

readout

returns

0.00

The

offset

calibration

the

200

range

now

completed

(

see

table

)

Repeat

the

steps

through

for

the

remaining

Ohms

ranges

Remove

the

shorting

plug

and

connect

the

Resistance

Calibrator

the

LOW

and

TEMP

jacks

Set

the

DMM

the

Ohms

2002

range

Set

the

Calibrator

+100.000

№

Press

the

DOWN

and

Autoranging

keys

simultaneously

After

completion

the

calibration

the

readout

will

show

doNE

and

the

gain

this

range

now

successfully

written

EEPROM

result

the

DMM

display

should

now

read

100.00

count

Repeat

steps

through

for

the

2kΩ

20kΩ

200kΩ

2ΜΩ

20Μ

ranges

according

the

settings

Table

Adjustment

Procedure

May

1994

Revision

}

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