Philips PM3320 Operating Manual page 43

4-23E
GROUND (channe! 8)
With GROUND selected, the connection between the input socket and the relevant input
circuit is interrupted and the input circuit is grounded.
1 MOhm 50 Ohm (channel B)
With this softkey, a selection can be made between an input impedance of 1 MOhm or an
input impedance of 50 Ohm.
Ifa probe with automatic probe indication is used, the oscilloscope automatically switches
to the correct impedance. No other selection can be made then.
If an input voltage higher than 5 V de and ac r.m.s. is applied to the input socket and 50
Ohm is selected, the instrument does not switch to 50 Ohm and a message
Unsafe condition for 50 Ohm to be switched on.
Input impedance not changed.
is displayed.
If50 Ohm is on and an input voltage between 5 V de and ac r.m.s.and 25 Vdc andacr.ms.
is applied to the input socket, the instrument will automatically switch to 1 MOhm input
impedance (without warning).
lf50 Ohmis on and an input voltage higher than 25 V de and ac r.m.s. is applied to the input
socket; 50 Ohm input impedance will not be switched off and the message
OVERLOAD ON CHANNEL B: reduce signal to prevent damages.
JESS ISIS ISIE TORIES IESE ISE IE EIS IOI A
is displayed.
IMPORTANT: Remove the input voltage or decrease the input voltage immediately
to < 5 V de and ac rms.!