![background image](http://html1.mh-extra.com/html/pasco/pi-9877/pi-9877_instruction-manual_3899216006.webp)
!
DC Power Supply
Specifications
6
Experiment-design Considerations
Please note the following properties of
the Power Supply when planning an application:
•
The Power Supply is over-current protected, but it is not current-limited or
current-regulated. If the maximum output current (1 amp by default, or lower if
you have changed the maximum-current setting) is exceeded, the Power Supply
will need to be manually reset before operation can resume. See “Over-current”
on page 20.
•
The output voltage range is 0 to 18 V. To achieve a negative voltage switch the
positive and negative leads.
•
This device is a programmable power source, not a function generator. The max-
imum frequency of the rectangle and ramp functions is 10 Hz. The maximum fre-
quency of the default sine-wave custom program is about 0.1 Hz.
•
The Power Supply is designed for current flow in one direction: out of the posi-
tive terminal and into the negative terminal. In the example illustrated below, the
Power Supply is switched from 0 V to 5 V, then back to 0V. The capacitor does
not discharge in a predictable way because there is not a simple path to ground.
To provide a path to ground, connect a resistor across the Power Supply’s
terminals as shown.
A current-sinking resistor is not typically required when driving motors, lamps
and heating resistors since these devices have a low DC resistance.
"#$%&
'())*+
!
"
,--.
#
/
,--.
$
,--.
#
/
,--.
$
"#$%&
'())*+
!
"
0-.
$
Содержание PI-9877
Страница 1: ... DC Power Supply PI 9877 Instruction Manual 012 09125A ...
Страница 18: ... DC Power Supply 18 T u t o r i a l ...
Страница 36: ......