HP BENCH Series User Manual

SECTION III
OPERATING INSTRUCTIONS
3-1 TURN-ON CHECKOUT PROCEDURE
3-5 CONSTANT VOLTAGE
3-2 The following checkout procedure describes
the use of the front panel controls and indicators
and ensures that the supply is operational;
a. Set AC toggle switch (1) upward to on
position; indicator (2) should light.
VOLTS
20 30 40
10 L L__/ 50
VOLTAGE
COARSE FINE
METER SELECTION
vOLTS^yjUgl^mA
+ GND
Figure 3-1. Front Panel Controls and Indicators
b. Set METER SELECTION switch (4) to
VOLTS position.
c. Turn COARSE (6) and FINE (5) VOLTAGE
controls fully ccw to ensure that output decreases
to OV, then turn the VOLTAGE controls fully cw to
ensure that output voltage increases to the maxi
mum rated output voltage.
d. Connect a milliammeter across the out
put of the supply (3) to check that the current
limit circuit within the supply is limiting the out
put current to:
Model Current Limit
6213A 1300 ±50mA
6215A 475 ±10mA
6217A 250 ±10mA
e. Remove milliammeter and connect load
to output terminals.
3-3 OPERATION
3-4 The power supply can be operated as a
single unit (normal operation), in parallel, or in
series. The output of the supply can be floated
up to 300 volts off ground.
3-6 To select a constant voltage output turn on
the supply and, with no load connected, adjust
the VOLTAGE controls for the desired output volt
age. To check the current limit, connect an ex
ternal ammeter across the output of the supply,
turn the VOLTAGE controls fully clockwise, and
observe the reading. The current limit is factory
adjusted in excess of the current rating of the
supply. If the existing current is not compatible
with the anticipated load requirements, the limit
can be changed as outlined in the following para
graphs.
3-7 CHANGING CURRENT LIMIT
3-8 The current limit can be varied by adjusting
resistor R50, located on the printed wiring board.
This adjustment procedure is described in Para
graph 5-63. The range of the current limit control
R50 is as follows:
Model Current Limit Range
6213A 800 - 1700mA
6215A 300 - 540mA
6217A 180 - 300mA
The current limit is normally adjusted to a
value far in excess of the current rating of the
supply to prevent the deterioration of line and
load regulation. Therefore, if for any reason the
current limit is adjusted so that the output current
is close to this value, the performance will not
meet the published specifications.
3-9 CONNECTING LOAD
3-10 Each load should be connected to the power
supply output terminals using separate pairs of
connecting wires. This will minimize mutual coup
ling effects between loads and will retain full ad
vantage of the low output impedance of the power
supply. Each pair of connecting wires should be
as short as possible and twisted or shielded to re
duce noise pickup. (If shield is used, connect
one end to power supply ground terminal and leave
the other end unconnected.)
3-11 If load considerations require that the output
power distribution terminals be remotely located
from the power supply, then the power supply out
put terminals should be connected to the remote
distribution terminals via a pair of twisted or
shielded wires and each load separately connected
3-1

HP BENCH Series Specifications

General

Brand	HP
Model	BENCH Series
Category	Power Supply
Language	English