Leader Electronics Corp. LBO-522 - Notes on Connection with a Trans-Less Equipment; Description on Panel

3.6 Notes on Connection with a Trans-less Equip¬
ment
The chassis of a trans-less equipment may be ap¬
plied with the primary power line voltage; When
the oscilloscope is connected with such an equip¬
ment, care must be taken for the electric shock
which is hazardous.
Particularly when the system is grounded to
the earth for the measurement of C-MOS circuits
or the like, the instrument in the system or the
device to be tested may be damaged by shorted
circuit.
The safest method of making the connection is to
use an isolation transformer of 1:1 ratio as shown
below.
4. DESCRIPTION ON PANEL
In this instruction manual, numerals in circles
indicate control knobs, switches, and the like.