12
149-10A
3.2 Measuring Method
3.2.1 Measuring Procedure
WARNING
• For measurement of 5 kV or higher voltage, be sure to
use the HTL2.5DH high voltage test lead.
• Be sure to connect securely between the 149-10A and
the measured object with the supplied high voltage test
leads. Note that, if the low voltage test lead is
accidentally disconnected while the high voltage is
being input, electric shock hazards may be caused or
the meter may be seriously damaged.
NOTE
• To measure with highest accuracy, warm up the 149-10A for
at least 15 minutes.
• If the 149-10A is used in dusty atmosphere or the meter is
used continuously for a long time with a high voltage being
input, dust may be collected on the INPUT terminal section.
Because input resistance degradation or voltage dividing
ratio disturbance, clean at appropriate intervals the INPUT
terminal and the internal insulators using a clean, dry cloth.
• The AC/DC converter of the 149-10A is a mean-value
response system and is calibrated with the rms value of sine
wave. Therefore, that errors may be caused if the measured
voltage waveform is largely different from sine wave.
1. Turn on ( ) the POWER swich.
2. Connect the supplied high voltage test lead (black) to the LOW
terminal of the tester as shown in Fig. 3.2.
LOW terminal
High voltage test lead (black)
Put the test lead clamp like this.
Fig. 3.2 Low terminal connection
