Metrix OX 832 User manual

OX 832

30 MHz-DIFFERENTIAL

OSCILLOSCOPE

User's manual

30 MHz-differential o cillo cope

CONTENTS

1. GENERAL INSTRUCTIONS....................................................................................................... 3

1.1. Safety precaution ................................................................................................................ 3

1.1.1. Before u e ..................................................................................................................... 3

1.1.2. During u e ..................................................................................................................... 3

1.1.3. Symbol ......................................................................................................................... 4

1.1.4. In truction .................................................................................................................... 4

1.2. Guarantee ............................................................................................................................ 4

1.3. Maintenance and metrological verification............................................................................ 4

1.4. Servicing .............................................................................................................................. 4

2. INSTRUMENT DESCRIPTION ................................................................................................... 5

2.1. Front panel de cription......................................................................................................... 7

2.2. Rear panel de cription.......................................................................................................... 8

3. GETTING STARTED .................................................................................................................. 9

3.1. AUTOSET ............................................................................................................................ 9

3.2. Vertical channel ................................................................................................................ 11

3.3. Di play mode .................................................................................................................... 12

3.4. Timeba e ........................................................................................................................... 13

3.5. Trigger................................................................................................................................ 13

3.6. Trigger delay (DELAY) ....................................................................................................... 15

4. APPLICATIONS ....................................................................................................................... 17

4.1. Vi uali ation of the calibration ignal.................................................................................. 17

4.2. Mea urement of amplitude and frequency.......................................................................... 17

5. SPECIFICATIONS.................................................................................................................... 18

5.1. Vertical deflection............................................................................................................... 18

5.2. Horizontal deflection........................................................................................................... 19

5.3. Trigger y tem ................................................................................................................... 19

5.3.1. Trigger delay coefficient............................................................................................... 20

5.4. AUTOSET function............................................................................................................. 20

5.4.1. AUTOSET pecification ............................................................................................. 20

5.5. General characteri tic ....................................................................................................... 21

6. SUPPLIES AND OPTIONS....................................................................................................... 22

6.1. Acce orie ........................................................................................................................ 22

6.1.1. Provided with the apparatu ......................................................................................... 22

6.1.2. Provided a option ..................................................................................................... 22

6.2. Option ............................................................................................................................... 22

30 MHz-differential o cillo cope

1. GENERAL INSTRUCTIONS

You have ju t purcha ed a 30 MHz-differential o cillo cope; we congratulate you on your

choice of thi high quality product.

Thi apparatu complie with IEC afety tandard 61010-1 +A1 +A2 (1995) ingle

in ulation, dealing with electronic mea urement in trument . Plea e read the e in truction

carefully and re pect the u age precaution , in order to obtain the be t u e from it.

Failure to re pect warning and / or u age in truction may damage the apparatu and / or

it component and may be dangerou to the u er.

1.1. Safety precautions

1.1.1. Before use

- Thi in trument wa de igned for u e indoor in an environment with a degree of

pollution 2 at an elevation of le than 2000 m, a temperature between 0°C and

40°C, and a relative humidity of 80 % up to 31°C.

- It can be u ed for mea urement on 300 V category III and 600 V CAT II (input )

in tallation and can be upplied by a 253 V CAT III network.

- Definition of in tallation categorie ( ee publication IEC 664-1):

CAT I : CAT I circuit are protected by device limiting tran ient overvoltage to a

low level.

Example: protected electronic circuit

CAT II : CAT II circuit are power upply circuit for dome tic or digital device that

may include tran ient overvoltage with an average value.

Example: power upply for hou ehold appliance and portable tool .

CAT III : CAT III circuit are power upply circuit for power equipment that may

include large tran ient overvoltage .

Example: power upply for indu trial machine or equipment

CAT IV : CAT IV circuit may include very high tran ient overvoltage .

Example: energy arrival

- Depending on the po ition of the fu e on the ba ic board, thi in trument may be

or 230 V

± 10 % network. Before connecting up the

in trument, check that the fu e po ition matche the rated voltage of your

di tribution network. To do thi , remove the top cover from the o cillo cope.

- Earth all metallic part that are acce ible to touch (including the working table).

- You are advi ed to u e the acce orie delivered with the in trument or propo ed

a option . Check that they are in perfect working condition before u e.

- Plug the cable into a ocket fitted with an earth connection.

1.1.2. During use

- Select vertical en itivity and timeba e range adapted to the mea urement.



When carrying out a measurement, never touch an unused terminal of the instrument.

The replacement fuse must be identical to the original fuse.

It is located inside

the apparatus in a housing on the cathode ray tube support part.

30 MHz-differential o cillo cope

1.1.3. Symbols

Refer to the u er' manual.

Incorrect u e may re ult in damage

to the device or it component .

Ri k of electric hock

Ground

1.1.4. Instructions

- Before opening the apparatus, alway di connect it from the main power upply

and mea urement circuit , and make ure that you are not charged with tatic

electricity which could damage internal component .

- Any repair, maintenance or adju tment of the o cillo cope when it i powered may

only be done by qualified per onnel, after reading the in truction in thi manual.

- A "qualified person" i a per on who i familiar with the in tallation, con truction

and u e and the danger pre ent. He i authorized to witch the in tallation and

equipment on and off in accordance with the afety rule .

- Take care not to ob truct ventilation hole when u ing the apparatu .

1.2. Guarantee

Thi o cillo cope i guaranteed again t any material defect or manufacturing vice in

accordance with the general condition of ale.

During the guarantee period (2 year ), the apparatu may only be repaired by the

manufac-turer, and the manufacturer will be free to decide to repair or replace all or

part of the apparatu . The guarantee condition tate that the manufacturer will pay

for return tran port.

The guarantee i not applicable in the following ca e :

1. any improper u e of the equipment or if it i u ed in a ociation with incompatible

equipment;

2. modification of the equipment without explicit authorization by the manufacturer’

technical department ;

3. work done by a per on not approved by the manufacturer;

4. adaptation to a pecific application not included in the definition of the equipment

or by the operating in truction ;

5. a hock, drop or flooding.

1.3. Maintenance and metrological verification

Return your in trument to your di tributor for any work to be done within or out ide

the guarantee.

1.4. Servicing

Clean the in trument with a wet cloth and oap. Never u e abra ive product or

olvent .

Some internal capacitors may retain a dangerous potential, even after the apparatus

has been switched off.

30 MHz-differential o cillo cope

2. INSTRUMENT DESCRIPTION

Thi in trument i a 30 MHz portable differential o cillo cope with AUTOSET. It

technology ha been de igned to ati fy the mo t demanding u er . It i intended for

electrotechnician and electronic expert (operation in normal or differential mode).

Thi o cillo cope' input can operate in both traditional and differential mode (independent

witching acce ible on the front):

in traditional mode

∗ Input CH1+ and CH2+ are active.

∗ Input CH1- and CH2- are inhibited internally, but the impedance a een from the input

remain con tant.

in differential mode

∗ Input CH1+ CH1- and CH2+ CH2- are active.

∗ The ignal di play corre pond to the difference between the ignal pre ent on

input CH 1+ and CH1- (and/or CH2+ and CH2-).



The voltage common to the inputs (CH1+, CH1-) or (CH +, CH -) is called the

common mode voltage Vcm.

∗ The peak common mode voltage max. Vcm depend on the calibre elected:

• 20 V for en itivitie from 10 mV to 0.5 V

• 200 V for en itivitie from 1 V to 5 V

• 600 V for en itivitie from 10 V to 200 V/div.

Vdiff

Vcm

CH1- CH2-

CH1+ CH2



The representation of the signal on the screen may be erroneous when the max.

common mode voltage authorized for the calibre selected is exceeded.

Performance of the oscilloscope

∗ 2 channel at 30 MHz

∗ High input dynamic: 10 mV to 200 V/div. (14 calibre )

∗ Triggering up to 50 MHz

∗ Trigger delay function

∗ The AUTOSET function automatically earche for the vertical en itivity and the

canning coefficient adapted to the ignal pre ent on channel CH1 and CH2.

The front panel i managed by an 8-bit microcontroller with FLASH memory which

handle the following ta k :

∗ Reading of the ab olute en itivity and time ba e coder

∗ Management of the LED

∗ Configuration of the ba ic board by erial link

∗ Management of communication with the PC via the RS232C link with the

HA1255 programming kit (optional)

∗ Generation of the calibration ignal

∗ Saving of the in trument' configuration in EEPROM

30 MHz-differential o cillo cope

Figur 1 : Fac avant

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

39 38 37 34 33 32 30 29 27 26 25

36 35 31 28

OX 832

30MHz

30 MHz-differential o cillo cope

2.1. Front panel description

1 - FOCUS

•

focu adju tment

- TRACE ROTATION

•

adju tment of the horizontal trace alignment

3 - INTENSITY

•

adju tment of the trace brightne

4 -

VOLT/DIV

•

election of the vertical en itivity for CH1

5 - CH1 DIFF

•

witching to normal or differential operating mode of CH1 channel

6 - POSITION 









•

adju tment of the vertical po ition of CH1 trace

7 - MODE 





•

right/left croll of vertical mode

8 - POSITION 









•

adju tment of the horizontal po ition of CH1 or CH2 trace

9 - MODE 





•

left/right croll of vertical mode

10 -

VOLT/DIV

•

election of the vertical en itivity for CH2

11 -

POSITION 









•

adju tment of the vertical po ition of CH2 trace

1 -

CH2 DIFF

•

witching to normal or differential operating mode of CH2 channel

13 -

HOLDOFF

•

adju tment of HOLDOFF TIME ( weep holdoff)

14 -

P-P

•

activation of peak-to-peak trigger mode

15 -

LEVEL

•

adju tment of trigger level

16 -

x 10

•

expan ion by 10 of the horizontal weep coefficient

17 -

VAR

•

continuou adju tment of weep coefficient of timeba e

18 -

•

activation of po itive or negative trigger lope

19 -

AUTO

•

activation of AUTO or triggered weep mode

0 -

T/DIV

•

election of the weep coefficient of timeba e

1 -

SOURCE 





•

right/left croll of trigger ource

SOURCE 





•

left/right croll of trigger ource

3 -

COUPLING 





•

left/right croll of trigger ource

4 -

COUPLING 





•

right/left croll of trigger ource

5 -

EXT +

•

external trigger + input

6 -

EXT -

•

external trigger - input

7 -

DELAY

•

adju tment trigger delay of timeba e

8 -

S / DLY

•

election of SEARCH ou DLY (delayed) weep mode

9 -

CH2 +

•

CH2 channel input

30 -

VAR

•

continuou adju tment of the CH2 vertical en itivity

31 -

COUPLING

•

election of CH2 channel coupling or mea urement on CH2

3 -

CH2 -

•

CH2 channel - input

33 -

PROBE ADJUST

•

calibration output

34 -

CH1 +

•

CH1 channel + input

35 -

COUPLING

•

election of CH1 channel coupling or mea urement on CH1

36 -

VAR

•

continuou adju tment of the CH1 vertical en itivity

37 -

CH1 -

•

CH1 channel - input

38 -

AUTOSET/ABORT

•

activation/deactivation of the AUTOSET function

39 -

POWER

•

ON/OFF key

30 MHz-differential o cillo cope

2.2. Rear panel description

42 45 40 41 43 42

Figur 2

(40) Location of th optional HA1255 PROGRAMMING KIT conn ctor

Thi RS232C erial link (40) e tabli he the communication between the o cillo cope

and a PC or compatible computer. It enable :

- the remote programming of the o cillo cope

- the reading of the o cillo cope configuration

(41) Mains plug

(42) Cord wind rs

(43) Mains plug location wh n carrying th oscilloscop

(44) Fus lab l

(45) Z Modulation

Input BNC at the back

Sen itivity TTL level

High level on

Low level off

Max. frequency 4 MHz

Input re i tance approx. 2 kΩ

Max. voltage ± 20 V

30 MHz-differential o cillo cope

3. GETTING STARTED



Respect the safety instructions indicated in Chapter 1.

- Position the rotary controls as indicated in the figure 1.

- Press the POWER key (39): the last memorised configuration of the front panel is

restored.

- Validate the AUTO key (19).

- Adjust : - brightness with the INTENSITY potentiometer (3),

- the thickness of thetraces with the FOCUS potentiometer (1),

- the horizontalness of the traces with the potentiometer to be reached

through the TRACE ROTATION hole (2).



Adjust the brightness of the trace according to ambient lighting. Excessive

brightness can damage the tube, particularly when there is no sweeping in process

(spot stationary).

- Apply the ignal to be di played to channel CH1 or CH2.

- Pre on the AUTOSET key (3) .

- When u ing a 1/10 probe, u e the PROBE ADJUST ignal (33) (2.5 V, 1 kHz) to adju t

the probe compen ation (refer to § 4. APPLICATIONS).

3.1. AUTOSET

• AUTOSET automatically carrie out the following earche :

active channel, vertical en itivity, horizontal deflection coefficient, trigger lope.

• AUTOSET automatically put the o cillo cope into the following configuration:

ynchro PTP, AC coupling of the connected channel, horizontal magnitude x 1,

DC coupling of the trigger ource.

• AUTOSET doe not affect : POSITION (H and V), VAR, DELAY, INTENSITY.

The AUTOSET function i activated by pre ing the AUTOSET/ABORT key (38) (key only

active while pre ed):

- The AUTOSET/ABORT LED remain on during the earch pha e.

- When the earch pha e end , if the calibre found by the AUTOSET function are

different from tho e indicated by the vertical en itivity and time ba e witche , the

AUTOSET/ABORT LED fla he .

- There are two way of quitting the AUTOSET function:

 Manual earch for the range found by AUTOSET:

• You earch for the AUTOSET range by turning the (4) and/or (10) en itivity and

(20) time ba e witche in the direction indicated by the coupling or trigger- ource

LED which i fla hing.

• The AUTOSET LED goe out when all the range determined by the AUTOSET

have been found.

 Pre ing the AUTOSET/ABORT key (38) again will cancel the AUTOSET function.



Vertical adjustment is not set by the AUTOSET. You should ensure that position (6)

and (11) rotary controls are correctly centred

30 MHz-differential o cillo cope

Figure 3

4 5 6 7 8 9 11

37 35 34 32 31 29

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