OX 832
30 MHz-DIFFERENTIAL
OSCILLOSCOPE
User's manual
Copyright ©
906121641 - Ed. 3 - 04/00
CONTENTS
1. GENERAL INSTRUCTIONS....................................................................................................... 3
1.1. Safety precautions................................................................................................................ 3
1.1.1. Before use ..................................................................................................................... 3
1.1.2. During use ..................................................................................................................... 3
1.1.3. Symbols......................................................................................................................... 4
1.1.4. Instructions .................................................................................................................... 4
1.2. Guarantee ............................................................................................................................ 4
1.3. Maintenance and metrological verification............................................................................ 4
1.4. Servicing .............................................................................................................................. 4
2. INSTRUMENT DESCRIPTION ................................................................................................... 5
2.1. Front panel description ......................................................................................................... 7
2.2. Rear panel description.......................................................................................................... 8
3. GETTING STARTED .................................................................................................................. 9
3.1. AUTOSET ............................................................................................................................ 9
3.2. Vertical channels ................................................................................................................ 11
3.3. Display modes.................................................................................................................... 12
3.4. Timebase ........................................................................................................................... 13
3.5. Trigger................................................................................................................................ 13
3.6. Trigger delay (DELAY) ....................................................................................................... 15
4. APPLICATIONS ....................................................................................................................... 17
4.1. Visualisation of the calibration signal.................................................................................. 17
4.2. Measurement of amplitude and frequency.......................................................................... 17
5. SPECIFICATIONS.................................................................................................................... 18
5.1. Vertical deflection ............................................................................................................... 18
5.2. Horizontal deflection........................................................................................................... 19
5.3. Trigger system ................................................................................................................... 19
5.3.1. Trigger delay coefficient............................................................................................... 20
5.4. AUTOSET function............................................................................................................. 20
5.4.1. AUTOSET specifications ............................................................................................. 20
5.5. General characteristics....................................................................................................... 21
6. SUPPLIES AND OPTIONS....................................................................................................... 22
6.1. Accessories........................................................................................................................ 22
6.1.1. Provided with the apparatus......................................................................................... 22
6.1.2. Provided as options ..................................................................................................... 22
6.2. Options............................................................................................................................... 22
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30 MHz-differential oscilloscope
It is located inside
1. GENERAL INSTRUCTIONS
You have just purchased a 30 MHz-differential oscilloscope; we congratulate you on your
choice of this high quality product.
This apparatus complies with IEC safety standard 61010-1 +A1 +A2 (1995) single
insulation, dealing with electronic measurement instruments. Please read these instructions
carefully and respect the usage precautions, in order to obtain the best use from it.
Failure to respect warnings and / or usage instructions may damage the apparatus and / or
its components and may be dangerous to the user.
1.1. Safety precautions
1.1.1. Before use
- This instrument was designed for use indoors in an environment with a degree of
pollution 2 at an elevation of less than 2000 m, a temperature between 0°C and
40°C, and a relative humidity of 80 % up to 31°C.
- It can be used for measurements on 300 V category III and 600 V CAT II (inputs)
installations and can be supplied by a 253 V CAT III network.
- Definition of installation categories (see publication IEC 664-1):
CAT I : CAT I circuits are protected by devices limiting transient overvoltages to a
low level.
Example: protected electronic circuits
CAT II : CAT II circuits are power supply circuits for domestic or digital devices that
may include transient overvoltages with an average value.
Example: power supply for household appliances and portable tools.
CAT III : CAT III circuits are power supply circuits for power equipment that may
include large transient overvoltages.
Example: power supply for industrial machines or equipment
CAT IV : CAT IV circuits may include very high transient overvoltages.
Example: energy arrivals
- Depending on the position of the fuse on the basic board, this instrument may be
powered by a 110 VAC or 230 VAC ± 10 % network. Before connecting up the
instrument, check that the fuse position matches the rated voltage of your
distribution network. To do this, remove the top cover from the oscilloscope.
The replacement fuse must be identical to the original fuse.
the apparatus in a housing on the cathode ray tube support part.
- Earth all metallic parts that are accessible to touch (including the working table).
- You are advised to use the accessories delivered with the instrument or proposed
as options. Check that they are in perfect working condition before use.
- Plug the cable into a socket fitted with an earth connection.
1.1.2. During use
- Select vertical sensitivity and timebase ranges adapted to the measurement.
When carrying out a measurement, never touch an unused terminal of the instrument.
30 MHz-differential oscilloscope
3
1.1.3. Symbols
Refer to the user's manual.
Incorrect use may result in damage
to the device or its components.
Risk of electric shock
Ground
1.1.4. Instructions
- Before opening the apparatus, always disconnect it from the mains power supply
and measurement circuits, and make sure that you are not charged with static
electricity which could damage internal components.
- Any repair, maintenance or adjustment of the oscilloscope when it is powered may
only be done by qualified personnel, after reading the instructions in this manual.
- A "qualified person" is a person who is familiar with the installation, construction
and use and the dangers present. He is authorized to switch the installation and
equipment on and off in accordance with the safety rules.
- Take care not to obstruct ventilation holes when using the apparatus.
Some internal capacitors may retain a dangerous potential, even after the apparatus
has been switched off.
1.2. Guarantee
This oscilloscope is guaranteed against any material defect or manufacturing vice in
accordance with the general conditions of sale.
During the guarantee period (2 years), the apparatus 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 apparatus. The guarantee conditions state that the manufacturer will pay
for return transport.
The guarantee is not applicable in the following cases:
1. any improper use of the equipment or if it is used in association with incompatible
equipment;
2. modification of the equipment without explicit authorization by the manufacturer’s
technical departments;
3. work done by a person not approved by the manufacturer;
4. adaptation to a specific application not included in the definition of the equipment
or by the operating instructions;
5. a shock, drop or flooding.
1.3. Maintenance and metrological verification
Return your instrument to your distributor for any work to be done within or outside
the guarantee.
1.4. Servicing
Clean the instrument with a wet cloth and soap. Never use abrasive products or
solvents.
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30 MHz-differential oscilloscope
2. INSTRUMENT DESCRIPTION
+
This instrument is a 30 MHz portable differential oscilloscope with AUTOSET. Its
technology has been designed to satisfy the most demanding users. It is intended for
electrotechnicians and electronics experts (operation in normal or differential mode).
This oscilloscope's inputs can operate in both traditional and differential mode (independent
switching accessible on the front):
in traditional mode
∗ Inputs CH1+ and CH2+ are active.
∗ Inputs CH1- and CH2- are inhibited internally, but the impedance as seen from the input
The voltage common to the 2 inputs (CH1+, CH1-) or (CH2+, CH2-) is called the
common mode voltage Vcm.
remains constant.
in differential mode
∗ Inputs CH1+ CH1- and CH2+ CH2- are active.
∗ The signal displays corresponds to the difference between the signals present on
inputs CH 1+ and CH1- (and/or CH2+ and CH2-).
∗ The peak common mode voltage max. Vcm depends on the calibre selected:
CH1+ CH2
• 20 V for sensitivities from 10 mV to 0.5 V
• 200 V for sensitivities from 1 V to 5 V
• 600 V for sensitivities from 10 V to 200 V/div.
Vdiff
Vcm
ou
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 channels at 30 MHz
∗ High input dynamic: 10 mV to 200 V/div. (14 calibres)
∗ Triggering up to 50 MHz
∗ Trigger delay function
∗ The AUTOSET function automatically searches for the vertical sensitivity and the
scanning coefficient adapted to the signal present on channels CH1 and CH2.
The front panel is managed by an 8-bit microcontroller with FLASH memory which
handles the following tasks:
∗ Reading of the absolute sensitivity and time base coders
∗ Management of the LEDs
∗ Configuration of the basic board by serial link
∗ Management of communication with the PC via the RS232C link with the
HA1255 programming kit (optional)
∗ Generation of the calibration signal
∗ Saving of the instrument's configuration in EEPROM
30 MHz-differential oscilloscope
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18
19
20
21
22
23
39 38 37 34 33 32 30 29 27 26 25
36 35 31 28
Figure 1 : Face avant
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30 MHz-differential oscilloscope
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2.1. Front panel description
1 -
FOCUS
•
focus adjustment
2 -
TRACE ROTATION
3 -
INTENSITY
4 -
VOLT/DIV
5 -
CH1 DIFF
6 -
POSITION
7 -
MODE
8 -
POSITION
9 -
MODE
10 -
VOLT/DIV
11 -
POSITION
12 -
CH2 DIFF
13 -
HOLDOFF
14 -
P-P
15 -
LEVEL
16 -
x 10
17 -
VAR
18 -
•
adjustment of the horizontal trace alignment
•
adjustment of the trace brightness
•
selection of the vertical sensitivity for CH1
•
switching to normal or differential operating mode of CH1 channel
•
adjustment of the vertical position of CH1 trace
•
right/left scroll of vertical modes
•
adjustment of the horizontal position of CH1 or CH2 trace
•
left/right scroll of vertical modes
•
selection of the vertical sensitivity for CH2
•
adjustment of the vertical position of CH2 trace
•
switching to normal or differential operating mode of CH2 channel
•
adjustment of HOLDOFF TIME (sweep holdoff)
•
activation of peak-to-peak trigger mode
•
adjustment of trigger level
•
expansion by 10 of the horizontal sweep coefficient
•
continuous adjustment of sweep coefficient of timebase
•
activation of positive or negative trigger slope
19 -
AUTO
20 -
T/DIV
21 -
SOURCE
22 -
SOURCE
23 -
COUPLING
24 -
COUPLING
25 -
EXT +
26 -
EXT -
27 -
DELAY
28 -
S / DLY
29 -
CH2 +
30 -
VAR
31 -
COUPLING
32 -
CH2 -
33 -
PROBE ADJUST
34 -
CH1 +
35 -
COUPLING
•
activation of AUTO or triggered sweep mode
•
selection of the sweep coefficient of timebase
•
right/left scroll of trigger sources
•
left/right scroll of trigger sources
•
left/right scroll of trigger sources
•
right/left scroll of trigger sources
•
external trigger + input
•
external trigger - input
•
adjustment trigger delay of timebase
•
selection of SEARCH ou DLY (delayed) sweep modes
•
CH2 channel input
•
continuous adjustment of the CH2 vertical sensitivity
•
selection of CH2 channel coupling or measurements on CH2
•
CH2 channel - input
•
calibration output
•
CH1 channel + input
•
selection of CH1 channel coupling or measurements on CH1
36 -
VAR
37 -
CH1 -
38 -
AUTOSET/ABORT
39 -
POWER
•
continuous adjustment of the CH1 vertical sensitivity
•
CH1 channel - input
•
activation/deactivation of the AUTOSET function
•
ON/OFF key
30 MHz-differential oscilloscope
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