HEATH
.7'11"6
TRI-POWER SUPPLY
Model SP-2718
595-1841-02
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Copyright © 1976
Heath Company
All Rights Re.
served
BENTON
HEATH
HARBOR,
COMPANY
MICHIGAN
49022
Page 2
TABLE OF CONTENTS
SPECIFICATIONS ..
OPERATION
CONTROL AND SWITCH FUNCTIONS
OPERATING PROCEDURES .
APPLICATIONS..
Independent Mode Applications . . . . . . . . . . . . . . . . . . . . . . 7
Tracking Mode Applications . . .
IN
CASE
General ... . . ...
Troubleshooting Chart
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OF
DIFFICULTY
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CIRCUIT DESCRIPTION
Primary Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-Volt
Supply.
20-Volt 'A' and 'B' Supplies
Metering Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15
CALIBRATION
APPENDIX
Parts List
Circuit Board X-Ray View . . . . . . .
Schematic Diagram . .
WARRANTY .
SERVICE INFORMATION
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14
14
14
15
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18
18
SPECIFICATIONS
Page 3
Outputs . .
'A' -Supply
'8'
-Supply
Regulation
Load .. .
Line
..
Ripple
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and
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Noise . ... .
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5 volts
DC
::!::
5%
at 1.5 ampere.
0-20 volts
continuously adj,ustable.
.
0-20 volts
continuously adjustable.
Less than 0.1 % (20 mV) variation
from no load to full load
on
Less than
from no load
on
20-volt Supplies: Less than
0.2%
voltage change
5-volt Supply: Less than
0.2% (10
voltage change of 10 volts.
Less than 5 mV rms.
DC
at 0.5 ampere,
DC
at 0.5 ampere,
20-volt supplies.
3%
(150 mV) variation
to
full load
5-volt supply.
(40
mV) for a line
of
mV)
for a line
10 volts.
..
Current Limiting
Tracking Range
Tracking Error
Series Operation
Parallel Operation . .
VOltage-Current Monitor Accuracy .
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Limiting for each supply
fixed
slightly above rated current
to
provide short-circuit protection.
2 to 18 volts.
Less than 1 volt.
All three supplies may be
in
connected
20-volt supplies may be operated
.
in
parallel by adding 0.
current-equalizing resistors (not supplied).
of
5%
.
series.
511
full scale.
Page 4
Meter Ranges . . .
Power Requirements
Power Switching Overshoot (On-Off)
Voltage Control, 20-Volt Supplies A and B .
Dimensions .
Weight
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The Heath Company reserves the right to discontinue products and to change specifications
at any time without incurring any obligation
sold.
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Voltages, 0-20 and 0-5.5.
Current, 0-550 mA and 0-2A.
.
100-135 VAC or 200-270 VAC,
50/60 Hz, 100 watts at full load.
None.
Continuously variable,
oto 20 volts.
4-1/2" high x 10-3/4" wide x
cm
(11.43
10 Ibs
.
x 27.3
(3
.73 kg).
-
to
incorporate new features
cm
x 22 .86 cm).
9"
deep
in
products previously
OPERATION
Refer
Before you use your Tri-Power Supply, you should become
entirely familiar with its capabilities, characteristics, and its
features. Study Figure 1 to learn each control and switch
function as you read this portion of the Manual.
to
Figure 1
(on
the fold-in).
Page 5
CONTROL
AN,o
LINE AND POWER SWITCHES (SW2 and SW1)
Line switch SW2 is located on the underside of the chassis. If
the line voltage
driver tip
slide. If the line voltage
the switch slide
The POWER switch
that applies the line voltage to the primary circuit
transformer when you push the switch to the ON position.
the same time, power
power has been applied to the unit.
in
your area
to
push the switch slide to expose the
to
expose the "240."
is
100-135 volts AC, use a screw-
in
your area
on
the front panel is a simple slide switch
is
applied to the pilot light to indicate that
is
200-270 volts AC, push
"120"
of
the power
on
the
At
METER SWITCH (SW4)
It
is
important that you know that METER switch (SW4) does
not switch any output voltage or current. The switch permits
you
to
observe any of the Power Supply outputs on the meter,
whether voltage or current. The METER switch thus allows
to
you to monitor any of the variable outputs and
accurately
to
any desired levels.
set them
METER
Note that the meter scales are printed
scale,
in
red, corresponds to each of the METEr! switch functions that also are lettered
a load from the output of the A supply; uB-AMPS" (current
flowing to a load from the output of the B supply; and,
5V-VOL TS (the voltage available at the output of the 5-volt
supp.ly).
The
l:Jpper
meter scale,
METER switch functions, also printed in black:
in
red: "A-AMPS" (current flowing to
in
black, corresponds to the following
in
two colors. The lower
"A
-VOLTS"
SWITCH FUNCTIONS
(the voltage at the output of the A supply); "B-VOL TS" (the
voltage at the output of the B supply); and, "5V-AMPS" (current flowing to a load from the output of the 5-volt supply) .
SUPPL Y A CONTROL (R7)
When you turn this control clockwise from its
output of front panel jacks J4 and J5 (OUTPUT A) will increase
from zero to any level up
500 milliamperes. Read these levels on the meter when the
METER switch is either at "A-VOLTS" or at "A-AMPS."
NOTE:
In
the TRACKING mode of operation, Supply A control
R7
is
disabled; control of the 20-volt A-supply is transferred to
• A TRACKING B.control
side of the front panel, which operates
with
0 SUPPLY B control R9).
to
20 volts and a load current up to
RS
(the small red knob at the right
"0"
as
a clutched control
o SUPPLY B CONTROL (R9)
Control
panel. The other half of this control
knob and is labeled
the two control knobs. The two controls are "clutched" together
knob is turned. Note that black knob
black letters
control.
J6 and J7. This control will vary the available B-supply voltage
peres. Read the output levels on the meter when the METER
switch is turned to B-VOL TS and to B-AMPS.
R9
in
Control
from zero
R9
is
half of the dual control at the right side of the front
is
turned with the small red
".
A TRACKING
such a manner that both controls will turn when either
("0
SUPPLY B")
adjusts the amount of voltage at OUTPUT B jacks
to
20 volts DC and a load current up to 500 milliam-
B"
in
red lettering above
R9
corresponds
on
the panel just above the
position, the
to
the
Page 6
• A TRACKING B CONTROL (RS)
Control
time either control is turned, the other will turn with it. Since it
a friction action, either control may be operated independently
of the other, providing the other control
RS
ING position.
SUPPLY A control R7, and is controlled by the small red knob
at
A and B 20-volt power supplies connected together internally.
RS
is "clutched" to
is enabled only when MODE switch SW3
In
this manner, the A 20-volt supply is disabled at
RS.
At no time are the electrical and electronic circuits of the
"0
SUPPLY
B"
control A9. At any
is
held
in
place. Control
is
in the TRACK-
is
MODE SWITCH (SW3)
In
the INDEPENDENT mode of operation, the 20-volt A supply
is connected
the Mode switch.
control
When MODE switch SW3
to
SUPPLY A control
In
this mode, the A-supply
R9
(small red knob) is disconnected from the circuit.
is
R7
through the contacts of
is
"floating" and
in
the TRACKING mode, control
A7 is removed from the circuit, and contro'l A9 is enabled and
the A-supply will track with the B-supply through the clutch
action of the dual control knobs.
OUTPUT JACKS (J1-J7)
Output jack
you wish to reference any of the three supplies to ground,
external connections from the appropriate supply jacks may
be connected to J 1 .
Jacks J2 and J3 are the connections for the fixed 5-volt,
1.5-ampere power supply.
Jacks J4 and J5 are the connections for the variable 20-volt,
500 milliampere A power supply.
Jacks J6 and J7 are the connections for the variable 20-volt,
500 milliampere B power supply.
J1
is a chassis ground connection. If, at any time,
OPERATING PROCEDURES
Two modes of operation are provided at the output jacks on
the front panel. These are the "Independent" and the "Tracking" modes. Each will be discussed under separate headings.
INDEPENDENT MODE
Each of the three power supplies
be operated independently from one another, either floating or
referenced to another AC or DC source, or referenced to the
Tri-Power Supply ground connection at J1. In addition, any of
the separate supplies may be connected
nal jumpers to provide up to 45 volts DC, referenced to any
external or internal level. NOTE: External references may not
exceed 200 volts.
TRACKING MODE
In
the TRACKING mode of operation, the 20-volt A and B
supplies are clutched together at the front panel dual control
RS/R9.
As either of the controls is turned, the other will turn
in
the Tri-Power supply may
in
series with exter-
the same manner. To adjust the controls, the voltage output
must be observed on the meter for each 20-volt supply, and
AS
the level of each set by controls
wish to have the A-supply referenced 5
variable B-supply, you should proceed as follows : Turn dual
R9
controls R8 and
R9
knob at
until A-VOLTS on the meter indicates
red knob. As you turn the black knob, the A-supply voltage will
track the B-supply voltage, always at a potential of 5 volts
(:t5%)
In
the TRACKING mode, the A and B supplies may be operated
referenced internally with jumpers, or to an external reference
voltage not exceeding 200 volts. As
mode, the three supplies may be connected as any combina-
in
tion
reference.
and hold
higher than produced by the B-supply.
in
parallel as a tracking pair of output voltages, either
in
series, to supply
fully counterclockwise. Grasp the black
it
as you turn the small red knob on R8
up
and R9. For example, if you
vo.lts
greater than the
+5
volts. Release the
in
the INDEPENDENT
to 45 volts total at any desired
APPLICATIONS
Page 7
The Tri-Power Supply is an ideal instrument for experimenters
and engineers. As an example, at Heath Company an engineer developed a transistorized preamplifier circuit for which
he needed supply voltages of - 16 volts DC and
in order to check out the circuit. Using the Tri-Power Supply, he
connected A
output. He then connected a jumper from the chassis GND
reference to the common connection between the two
supplies.
volts and the B-supply output produced +16 volts.
+ to
B-,
and set the A and B supplies
In
this manner, the A-supply output produced a
+16 volts DC
to
16 volts
-16
INDEPENDENT MODE APPLICATIONS
INDEPENDENT FLOATING SUPPLIES
Refer to Figure 2
Figure 2 illustrates each of the three Power Supply outputs
connected
floated at a level up to 200 volts from ground, or from each
other.
In
this example, the MODE switch is at INDEPENDENT;
SUPPLY A control
circuit, and SUPPLY B (black) control
the other 0-20 volt circuit.
Each of the supplies has fixed current Hmiting in all modes of
operation at slightly above the rated current output. This provides infinite short-circuit protection to the Power Supply.
as
you read the following information .
to
separate loads. Each of the supplies may be
R7
controls the output level of one 0-20 volt
R9
controls the output of
The following sections of the Manual will show you a number of
examples of how you can use your Power Supply. The variety
of uses
NOTE: Since 5 volts is used extensively
applications, it is incorporated into the Tri-Power Supply as a
fixed output. This 5 volts DC may be referenced to any other
voltage
GND jack at J1.
@m
is
extensive, however, so only a few are given.
in
TTL logic
up
' to 200 volts,
or
to the Power Supply front panel
+oDbIQvQmQ+
I I I I I I
I I I I I I
I I I I I I
I I I I I I
I I I I I I
I I I I I I
I I I I I I
II I I I I
1
~
~
:
LOAD
0-500mA.
I
LOAD
0-500mA .
~
.011LF
NOTE: Each circuit output has a
from
,it
s negative terminal
capacitance on the load circuit should be considered when
you attempt to float any of the supplies at a level above chassis
ground.
to
chassis ground. T
capacitor connected
he
effect of this
Figure 2
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