The following general safety precautions must be observed
during all phases of operation, service and repair of this
instrument. Failure to comply with these precautions or with
specific WARNINGS given elsewhere in this manual violates
the safety standards of the design, manufacture and intended
use of the instrument.
YOKOGAWA assumes no liability for the customer’s failure to
comply with these requirements.
This manual is part of the product and contains important
information. Store this manual in a safe place close to the
instrument so that you can refer to it immediately.
Keep this manual until you dispose of the instrument.
The 2051, 2052 and 2053 instruments are shipped only after
stringent in-house inspection. Should the instrument suffer
damage that is attributable to improper manufacture or an
accident during transport, contact the sales representative from
which you purchased the product or your nearest YOKOGAWA
sales office
All products of YOKOGAWA are guaranteed for a period of one
(1) year from the date of delivery.
YOKOGAWA will repair the product in question, free of charge,
if the product fails during the guarantee period for reasons that
are evidently attributable to YOKOGAWA.
A taut-band suspension system is used in
portable instruments (meter).
This system has no pivot and jewel bearings so these portable instruments
are friction free and thoroughly resistant to shock and vibration.
The instruments have excellent reliability and deteriorate very little over
time.
1. Do not use these instruments in a location exposed to direct sunlight, an
external magnetic field or mechanical vibration or in a high-te perature
highly humid environment.
2. Place the instrument on a fairly level surface.
A horizontal position will give the highest accuracy.
3. When using a number of these instruments in an array, keep them as far
away from each other as possible.
4. Before wiring any of these instruments, carefully check the measuring
ranges and polarities. When wiring, securely fasten the terminals.
When a large current needs to be measured, use wire that is both thick
enough and has sufficient current-carrying capacit .
5. Before measurement, check that the pointer coincides exactly with the
zero scale point. If it does not turn the zero adjust screw provided on
the meter cover until the pointer meets the zero scale point.
Position your eye so that the mirror image of the pointer coincides with
the actual pointer. However, if the pointer is off from the zero scale
point because the pointer is bent, do not adjust using the zero adjust
screw because this will lead to errors.
6. Be careful not to apply an unreasonably large current or high voltage to
the instrument.
7. For the optimum instrument accuracy, select a measuring range such
that the indication may be read in the top half of the scale.
8. Try not to apply too much force when wiping the glass window surface
of the instrument during measurement. Doing so may result in a
deviation in the indication due to static electricity.
This is especially true when the instrument is used in a dry season.
If the surface is dirty, gently clean it using a dry, soft cloth.
— 2 —
IM 2051-01
測定法・結線図
Ammeter
電源側
Power Source
負荷側
Voltmeter
METHOD and CONNECTIONS
1.
したがって整流した波形が脈動していますと,計器はその平均
2.
3.
は,永久磁石可動コイル形計器で直流専用です。
2051
値を示します。
は,整流形計器で波形ひずみのない交流で使用します。
2052
は,可動鉄片形計器で,商用周波数での電流,電圧測定に
2053
使用します。
電圧計
1. Model
be used for DC measurement only.
Therefore, if a current such as a rectified wave (a pulsating, current) is
measured, the instrument will indicate the mean value.
2. Model
current with very little waveform distortion.
3. Model
current and voltage at commercial frequencies.
is a permanent-magnet moving-coil type meter that is to
2051
is a rectifier type, which are used for measuring alternate
2052
is a moving-iron type meter, which are used for measuring
1. To ensure good measurements, keep the instrument free of dust,
moisture, and away from direct sunlight.
2. If an overload or excessive shock causes the accuracy of the instrument
to become doubtful, check several scale points and compare these
readings with an instrument which has been properly calibrated.
If the accuracy of the instrument is found to be different from its rating,
readjust the instrument.
NOTE
If any troubles occur in the instrument, contact your nearest
YOKOGAWA Sales office or sales agent.