Hioki 3197 - Input and Measurement Precautions

Operating Precautions
10
Input and Measurement Precautions
• The maximum input voltage is as follows:
Voltage input section: 780 Vrms, 1103 V peak.Current input sec-
tion: 1.7 Vrms, 2.4 V peak
Attempting to measure voltage in excess of the maximum input
cou
ld destroy the instrument and result in personal injury or
death.
• The maximum rated voltage between the inputs and ground is
600 Vrms AC.To avoid damage to the instrument and personal
injury, never attempt to measure voltage that exceeds this rated
voltage above ground.
• The voltage input terminals U1, U2, and U3 are not isolated from one
another.
To avoid electric shock accidents, use care to prevent wires from inad-
vertently touching the wrong input terminals whenever voltage is
pr
esent.
• Note that the instrument may be damaged if current or voltage
exceed
ing the selected measurement range is applied for a long time
• When the power is turned off, do not apply voltage or current to the
voltage input terminals or clamp sensor. Doing so may damage the
product.
• To prevent damage to the instrument and sensor, never connect or
di
sconnect a sensor while the power is on, or while the sensor is
clamped around a conductor.
Correct measurement may be impossible in the presence of strong
magnetic fields, such as near transformers and high-current conduc
-
tors, or in the presence of strong electromagnetic fields such as near
r
adio transmitters.
Measurement values
• To ensure measurements are precise, warm up the instrument for at
l
east 30 minutes after plugging it in.
• This instrument is designed to measure commercial power lines with a
frequency of 50 or 60 Hz. It cannot measure power lines of other fre-
quencies or power lines where the waveforms are controlled using an
i
nverter.
• This instrument cannot measure power lines with superposed direct
current.
• This instrument uses algorithms to measure values for input voltage
and cur
rent waveforms using (see the specifications). On device using
different operation principles or algorithms differ, differences in mea-
surement values may result.
• When the display value for voltage or current is less than 1% of the
r
ange, zero is displayed.