GW Instek GVT-427B - Manual (Page 4)

GVT-427B User Manual
6
Panel Description
(1) Meter
Provide easy readings for both voltage and dB scales. For
GVT-427B, the black pointer is CH 1 and the red one is CH 2.
(2), (3) ZERO adjustment
Mechanical ZERO adjustment for the pointer. For GVT-427B,
the black-mark screw (2) is to adjust CH 1 pointer whereas the
red-mark screw (3) is to adjust CH 2.
(4), (5) CH 1 and CH 2 Range selector switch
10 dB step attenuator to select a desired voltage range for an
easy readout. When the mode switch (10) of GVT-427B is
DISENGAGED, CH 1 and CH 2 range can be selected
independently. However, when the mode switch is
DISENGAGED, the CH 2 range will change according to the
selected CH 1 irrespective of the CH 2 selector switch (5)
position.
(6), (7) CH 1 and CH 2 input connector respectively
The terminal where the measured signal is applied.
The maximum voltage of DC isolation is ±30 V (peak value)
GVT-427B User Manual
7
(8), (9) CH 1 and CH 2 Output connector
respectively
Provide output signals when the meter is used as a preamplifier.
When the range selector switch is setting at 100 mV, the output
voltage will be approximately equal to the input voltage.
However, when the range selector switch is setting to the next
higher or lower voltage range, the amplification factor is
decreased or increased by 10 dB respectively.
The maximum voltage of DC isolation is ±12 V (peak value)
(10) Mode switch
If this button is setting as DISENGAGED, the CH 1 and CH 2
range selector switches could select their related own ranges.
If the mode switch has been pressed, the CH 1 range selector
switch could select both CH 1 and CH 2 voltage ranges
simultaneously, and the CH 2 range selector switch would be
ineffective.
(11) Grounding selector switch
If this switch is setting to the upper position, the CH 1 and CH 2
Input Command Lines are isolated from each other, and they
are floated relative to chassis ground through a resistance of
100 k
Ω. If the switch is setting the down position, both lines
could be connected directly to the chassis.
The maximum voltage of DC isolation is ±30 V (peak value)
(12) Power Indicator
(13) Power Switch
(14) Appliance AC Inlet