Hioki RM3542-50, Instruction Manual

Page: 16 / 234

Operating Precautions
10
Before Connecting to the RS-232C Connector or SET MONITOR Connector
• Use a common ground for both the instrument and connected device.
Using different ground circuits will result in a potential difference between the instrument's
ground and the connected device.
If the communications cable is connected while such a potential difference exists, it may
result in equipment malfunction or failure.
• Before connecting or disconnecting any the communications cable, always turn off the
instrument and the connected device. Failure to do so could result in equipment malfunc-
tion or damage.
• After connecting the communications cable, tighten the screws on the connector securely.
Failure to secure the connector could result in equipment malfunction or damage.
Before Measuring
To avoid electrical hazards and damage to the instrument, do not apply voltage
exceeding the rated maximum to the EXT. I/O connectors.
• Do not apply any voltage to the measurement jacks. Doing so may damage the unit.
• Never attempt to measure at a point where voltage is present. In particular, do not mea-
sure a transformer or motor immediately after a temperature increase test or withstand-
voltage test, as the instrument could be damaged by induced voltage or residual charge.
• Battery internal resistance cannot be measured with this instrument. It will sustain damage.
To measure the battery internal resistance, we recommend the Hioki 3554, 3555, BT3562,
BT3563 and 3561 Battery HiTesters.
• To obtain the guaranteed measurement accuracy, allow at least 30 minutes warm-up.
• The instrument internally retains all settings (but not measurement values), such as mea-
surement range and comparator settings. However, measurement settings made through
the RS-232C or GP-IB interface are not memorized.
• In the 100 Ω or higher ranges (LOW POWER: OFF setting), a measurement error may
occur due to the influence of thermo electromotive force.
• The DC resistance of a power transformer cannot be measured. When measuring objects
with a large L, such as choke coils and other inductors, measurement values may be
unstable. In such cases, contact your
authorized Hioki distributor or reseller
.
• Carefully insulate all H
CUR
, H
POT
, L
POT
and L
CUR
wiring. Proper 4-terminal measurements
cannot be performed and an error will occur if the core and shield wires touch.