Hitachi V-355 Operation Manual page 20

Connection of earth lead wire
A good example
(a)
o
Multiply the reading of VOLTS/DIV by I O.
For example , if the VOLTS/DIV is SOmV/DIV, then
read the waveform as
x
S OmV/div 1 0 SOOmV/div
=
o
To avoid me asureme nt error, put the probe in the follow­
ing correction state and check it before measurement
fail.
without
Connect the tip of the probe to the CAL O.SV tip of
l kHz calibration square wave .
When this correction capacity value is at optimum the
waveform takes the shape as shown in Fig. (a).
If the waveform is as shown in Fig . (b) or Fig . (c),
(3) A bad example
rotate the trimmer on the matching box of the probe by
using a screwdriver until the optimum state is obtained.
L
Capacitance correction trimmer
(a} Optimum (b) Capacity too
iip
(2) At t e of direct connection
When connecting a signal directly to the oscilloscope not
using the attached probe AT- 1 0 AK1 .5 ( 1 0 : 1 ), pay atte n­
tion to the following points in order to minimize the me a­
sureme nt error.
o
When performing observation using a bare lead wire, no
trouble occurs of the circuit to be measured is of low
impedance and high level.
However, note that, in most cases, me asurement error
may be caused by static stray coupling with other circuit
and power line .
This me asureme nt error cannot be ignored even in low
fre quency region.
(c) Capacity too
large
small
17