Iwatsu SS-560, Инструкция по эксплуатации, Страница: 32 / 36

Appendix
28
•
The output of this instrument is terminated internally. Use a
waveform measurement instrument with an input impedance
of at least 1 M Ω .
•
Immediately after powering on, this instrument may be subject
to an appreciable offset drift due to the effect of self-heating.
To counteract this, allow the instrument to warm up for about
30 minutes before carrying out measurement.
•
When performing continuous measurements, it is necessary
to be aware that the offset voltage drifts, depending on factors
such as the ambient temperature.
•
Under certain circumstances, oscillation may occur if the
probe is connected to the PS-52 or PS-54 POWER SUPPLY
while the power supply is on. This does not indicate a
malfunction.
Oscillation can be stopped and operation restored to normal
by opening and closing the clamp.
•
Acoustic resonance may occur depending on the level and
frequency of the measured current. This does not normally
affect measurements unless a foreign substance such as dust
is present on the contact surfaces of the sensor head.
• The reading may be affected by the position within the clamp
aperture of the insulated target conductor to be measured.
The insulated target conductor to be measured should be in
the center of the clamp aperture.
•
When carrying out measurement, press the slider on the
sensor head until the "UNLOCK" indication disappears, and
hold it until LOCK appears, and check that the opening lever
is firmly locked and the clamp securely closed. Correct
measurements cannot be performed unless the clamp is
securely closed and the slider is pressed until LOCK is
displayed.
•
At high frequencies, common mode noise may affect
measurements taken on the high voltage side of circuits. If
this occurs, reduce the frequency range of the waveform
measuring instrument, or clamp onto the low-voltage side of
the circuit, as appropriate.