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 2041 instruments are shipped only after stringent inhouse 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
ofce.
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
The
electrodynamic type wattmeter that is used to measure DC and AC electric
power in laboratories and factories.
The single-phase wattmeter (Model 2041 01*, 2041 02 and 2041 03) can
measure DC power with a frequency of 25 to 1000 Hz.
The low-power-factor wattmeters (Model 2041 11* to 2041 22*) can be
used for carrying out an Epstein frame test on core loss or for measuring
either power of a low power factor or low levels of electric power.
The low-power-factor single-phase wattmeter can measure DC power with
a frequency of 25 to 500 Hz.
* The 2041 01(Single-phase wattmeter) has been discontinued.
The Single-phase low-power wattmeters (2041 11 to 2041 22)
Portable Single-phase Wattmeter is a taut-band suspension,
These are used for the voltage connection.
The common terminal is marked with the voltage polarity “±”, and
the two other terminals are marked with their respective voltage
ratings.
Current Terminals:
One of the terminals is marked with “±” to show the polarity
relation to the voltage coil, and the two alternative current
terminals are marked with their respective current ratings.
Table of Range-multiplier Constants:
The table is located on the side of the instrument case, and the
actual power value is obtained by multiplying the constant listed in
the table by the indication value on the scale.
Refer to the operational procedure for more information.
1. Do not use these instruments in a location exposed to direct sunlight, an
external magnetic eld or mechanical vibration or in a high-temperature
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 sufcient current-carrying capacity.
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, clean it gently with a dry soft cloth.
— 3 —
IM 2041-01
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