Specifications

Indicator Line-up,
Precautions & Specifications
23
Glossary of Terms
Term Meaning Term Meaning
⎧
⎩
⎧
⎩
Standby conditions
Prior to testing, the following input is applied to meters that are required to
have a standby state.
Measured quantity
DA, DV, AA, AV
W, VAR
F
PF
SY
Time
15
minutes
Input condition
80% of maximum scale value
Voltage: 100%;
power factor (or reactive factor): 1
80% of maximum scale value
Voltage: 100%; maximum scale value
Voltage: 100%; current: 80%;
power factor: 1
Voltage: 100%; synchronization point
Abbreviations for items measured
DA : DC current
DV : DC voltage
AA : AC current
AV : AC voltage
W: Power
VAR : Reactive power
PF : Power factor, phase
F : Frequency
SY : Synchroscope
Standard value
1) DA, DV, AA, AV, W, VAR
The upper limit of the
measurement range; the sum of
the absolute values of both sides
where there is a zero point on the
scale [i.e., there are positive and
negative ranges]; the span when
the scale does not match the
quantity of electricity.
2) F
Upper-limit value of the
measurement range
3) PF, SY
90° electric angle
Electric indicator
(direct-acting
indicator)
Electronic indicator
Fixed indicator
(indicator for
switchboard)
Portable indicator
Wide-angle indicator
Receiving indicator
Zero-suppressed
indicator
Movable coil
indicator
Movable iron core
indicator
Rectifier indicator
Transducer indicator
Bimetal indicator
Compatible accessory
Limited-compatibility
accessory
Dedicated accessory
(non-compatible accessory)
An indicator with a needle driven by a mechanically coupled
movable element.
An indicator that uses an electronic means to measure and
display an electrical quantity or non-electrical quantity.
Indicators that are mounted permanently, connected to an
external circuit via fixed conductive wires.
An indicator that can be transported and used in different
places.
An indicator with a scale spanning a range of 180° or more.
Indicators with scales that differ from the quantity of
electricity input, but the relationship between the quantity of
electricity input and scale values is known.
An indicator with a mechanical zero point outside the range
of the scale.
An indicator that operates based on the interaction between
magnetic fields produced by a fixed, permanent magnet and
by a current inside a movable coil.
Indicators that have fixed and moving cores made of soft
magnetic material and operate based on the repulsive force
(and suction) generated as a result of magnetizing the fixed
and mobile iron cores by passing an electrical current
through the fixed coil.
An indicator combining a DC-operated indicator and a
rectifier to measure AC current/voltage.
An indicator that converts a quantity of AC electricity to a
DC voltage/current using an electronic device or circuit, and
then indicates the quantity using a movable coil indicator.
Heat-based indicators that operate by changing the shape
of the metal elements, which occurs when they are heated
directly/indirectly via an electrical current.
An accessory that has special properties/accuracy itself,
regardless of whether or not it is combined with the
performance of an indicator.
An accessory that has special properties/accuracy itself and
can be combined with an indicator that has special
performance.
An accessory that is adjusted considering the electrical
characteristics of the indicator it is combined with.
Intrinsic error
Standard value
Span
Overshoot
Response time
Residual
displacement
Extent of influence
Distortion rate
(total harmonic
distortion rate)
Ripple content
Standby state
Error of an indicator in a standard state.
Intrinsic error =
target value - reference value
✕ 100 (%)
A specified standard-error value used to define the accuracy
of an indicator. The value varies according to the type of
indicator.
·
For ammeters, voltmeters, wattmeters and varmeters, the
standard value is the upper value of the measurement range.
(If there are both mechanical and electrical zero points in the
scale [i.e., there is a negative and positive range], the
standard value is the sum of the absolute values of the
electrical quantity corresponding to the two limits of the
measurement range.) (If the scale does not match the quantity
of the electricity input, the standard value is the span.)
· Frequency meter
The upper value of the measurement range.
· Power factor meter
Electrical angle of 90°.
The algebraic difference between the upper and lower limits
of the measurement range.
The difference between the maximum deflection value and
the final value when a measured quantity changes suddenly.
When the measurement value changes suddenly from zero
to a specified value, the time (seconds) until the needle
stops at its final stationary position.
The deflection of a mechanically controlled movable
element still remaining after the cause of the deflection has
been eliminated.
In general, the potential extent of influence that an external
factor has on performance (e.g., ambient temperature,
external magnetic field).
Rate:
Effective value of the harmonics contained
Content:
Effective value of varying component
Prior to indicator testing, the specified measurement amount
supplied to the circuit being measured.
base value
Effective value of non-sinusoidal wave
value of DC component