Philips PM3311 Serviceanleitung

PHILIPS
821123
Already published: —
Subject: I. Service information of the probes.
WARNING:
PROBE
ADJUSTING
1.1.
The h.f. Stepresponse correction network has been adjusted by the manufacturer to match the oscilloscope
O
input. For optimum pulseresponse, for separate deliveredprobes,the probecanbeadjustedto matchyour
particular oscilloscope. Later readjustmentis only necessaryif the probe is to be usedwith a different type
of oscilloscope, or after replacement of an electrical component.
For the adjustment,
Connect the probe to a fast pulse generator (rise-time not exceeding I ns) which is terminated by its
characteristic impedance. Dismantle the compensation box. Set the generator to 100 kHz. Adjust R2 and R3
alternatively
It is important that the leading edge is as steep, and the top is as flat, as possible. Incorrect settings of R2 and
R3 give rise to pulse distortions asshown in Fig. 2. and 3.
Preset potentiometers
Fig. 1.
correctly
TEST AND
2. Installation of batteries for memory
3. Installation and address selection of the IEC bus option PM3325.
The opening of coversor removalof parts, except tho-ve to which access can be gainedby hand,
is likely to expose life parts, and also accessible terminals may be life.
The instrument shall be disconnected from all voltage sources before any adjustment, replace-
ment or maintenance and repair during which the instrument will be opened.
The following proceduresshall only be carried out by a qualified personwho is awareof the
danger involved.
INFORMATION
THE H.F. STEP RESPONSE
proceed as follows:
to obtain a display as shown in Fig. I.
Fig. 2.
adjusted
Scientific & Analytical Equipment
Test & Measuring Instruments
Industrial Automation
Advanced Automation Systems
Welding
MEASURING INSTRUMENTS
OSCILLOSCOPE PM3311
back-up.
Rounding due to incorrectly
adjusted potentiometers
PHILIPS
Scientific &
Industrial
Equipment
Division
Fig. 3. Overshoot due to incorrectly
adjusted potentiometers.
9499 448 22311
osci41
MAT 615
ANOS