11
3-4
．
Switches on Front Panel and Connection Terminals on
Rear Panel
＊
Make sure that the MASTER/SLAVE selector switch on the
front panel is set to the M position.
＊
Make sure that the OUTPUT SW F/R selector switch on the
front panel is set to the F position.
＊
Make sure that all remote selector switches on the front panel
are set to the Off positions.
＊
Connect nothing with the connection terminals on the rear
panel unless the master/slave mode, remote control mode or
the like is selected.
3-5
．
Digital Display
＊
Digital display of the PA-B series is subject to 1-digit
fluctuations, which depend on the performance of the A/D
converter. Such fluctuations do not imply ripples or noises in
output.
＊
Display may become unstable if the available commercial
power source contains much common mode noises or there is
an intense noise source near the PA-B series. Be very
careful.
3-6. Switching Points of Relay
＊
The PA-B series switches the secondary taps of the internal
transformer using a relay and changes the input voltage to the
series regulator in order to reduce internal losses. It has
three relay switching points, which vary with the input voltage.
＊
If the input voltage varies when the preset output voltage is
close to the relay switching point, the relay switches and a
relay switching sound may be heard. (This implies no
trouble.) Noises may be generated at the relay switching
point when the output increases, depending on input voltage
(low voltage) or load conditions.
