Leader Electronics Corp. LDM-171 - Operation; Preliminary Notes; Power Supply Voltage; Input Voltage

4. OPERATION
4.1 Preliminary Notes
4.1.1 Power Supply Voltage
There is a ±10% tolerance around the power sup-
ply voltage rating. If the voltage is more than 1 ()Of,
below the rating, the meter may not function cor·
rectly. If the voltage is more than 10% above the
rating, the power supply circuit may be damaged.
Check the voltage range and fuse rating on the
rear panel.
The power transformer has series and parallel
winding taps for 100V and 120V. The voltage
rating
can be modified by altering the tap wiring.
Wiring
of Transformer Taps
a b
!!
POWER
ON
FUSE
100V
03
220V
Five ranges are possible, as given in the table below.
Check that the fuse rating matches the range.
Rating
100V
120V
200V
220V
240V
30
a b
100V
a b
220V
Permissible voltage
range
(±10%)
90 -110V
108- 132V
180- 220V
198- 242V
216- 264V
120V
<(_3 3j_
0 2 20
240V
a b
120V
02
20
Fuse rating
0.25A
Time lag
0.2A
Time lag
240V
4.1.2 Input Voltage • Distortion and SIN Measurement
The tables below list the maximum voltages that
may be applied across the INPUT terminal @
Do not apply higher voltages.
- s-
Range
1V
3V
10V, 30V
Maximum permissible
input voltage
10Vrms
30Vrms
50Vrms