4. HOW TO USE
11
4. HOW
TO
USE
4.1
Turning the Power ON
The LT 4441/4442 does not have a power switch. To turn the power ON, connect the power
cord to the instrument, and connect the power cord plug to a power outlet.
The LT 4441/4442 uses a relay. A clicking noise can be heard when you turn the power ON or
OFF, but this is not a sign that the instrument is malfunctioning.
• Standby
When you turn the power ON, the LT 4441/4442 enters Standby mode. When on standby, the
SYNC SOURCE PRIMARY, AUTO SWITCHING SWITCH FAULT, and KEY LOCK ON and
OFF LEDs light, and the AUTO SWITCHING DISABLED LED blinks. The LT 4441/4442 does
not function when it is in this state.
Figure 4-1 Standby mode
• Leaving Standby Mode
When the LT 4441/4442 leaves Standby mode, the SYNC SOURCE PRIMARY, AUTO
SWITCHING SWITCH FAULT, and KEY LOCK ON LEDs light.
The LT 4441/4442 does not have a last-memory feature. Regardless of the settings that were
being used when the LT 4441/4442 was turned OFF, it starts with the following settings when
it is turned ON.
Figure 4-2 Leaving Standby mode
• Setting the Standby Time
You can use DIP switch S7's SW2 to select the standby time. You can select approximately 1
minute (ON) or approximately 4 minutes (OFF). Match this setting to the rise time of the
system signal source that you are connected to.
The factory default setting is approximately 1 minute.
See section 4.3.6, “Operation Mode and the Standby Time Settings.”
