RM 4300 pages

RM 430
Transformation Ratio Meter

The ratio meter type 430 is used for the measurement and
check of the transformation ratio of voltage dividers and
terminal networks.
The instrument measures the real transformation ratio taking
into consideration the influence of the surroundings and
including the effect of the measuring cable (which is
important especially in the case of damped capacitive voltage
dividers).
The connection to the high voltage electrode of the voltage
divider and the instrument can be done with a wire of 1 mm
diameter. For the low voltage arm the impulse voltage
measuring cable shall be preferably used.
The transformation ratio meter has been developed especially
for checking-up the transformation ratio of high voltage
dividers in the test field.

ADVANTAGES & BENEFITS

Easy usage
Real Ratio measured
Special designed for HV dividers
Small, portable unit
Battery powered

APPLICATIONS
The instrument is available as a small portable unit placed in
a synthetic housing. The unit is powered from a built-in
battery thus enabling measurements at appropriate places on
the test platform.
One banana plug or one BNC output respectively is used for
the connection to the voltage divider; one LEMO plug and one
BNC plug for the low voltage connection.
By pressing a push-button a sine wave of 1000 Hz is applied
and the value of the transformation ratio of the voltage
divider is displayed digitally.
The ratio read-out remains during approx. 1 min. on the
screen then vanishes automatically.
The selection of the measuring range occurs automatically
thus eliminating calculations for the determination of the
transformation ratio which are time consuming and subject to
errors.

TECHNICAL SPECIFICATIONS
Measuring Range

1 .. 9999

Ranging

automatic

Max. load

< 10nF, > 5k

Accuracy

± 1%

Calibration Voltage

1kHz, 90Vpp sine wave

Display

4 digits

Overflow indicator

yes

Supply

Built-in battery with charger

Duration

100 measurements / charge

Battery check

yes

Temperature

5°C .. 40°C

Humidity

5 .. 95% r.h.

Dimensions

190 x 137 x 60 mm

Weight

1 kg

a brand of
Haefely is a subsidiary
of Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

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