HP Lab Series - Programming and Regulation Adjustments; Constant Voltage Programming Calibration; Constant Current Programming Calibration

•
•
•
panel meter
reads
zero.
b,
Connect
differential
voltmeter
across
sup-
ply,
observing
correct
polarity.
c.
Set
METER
switch
to
highest
voltage
range
and
turn
on
supply.
Adjust
VOLTAGE
control
until
differential
voltmeter
reads
exactly
the
maximum
rated
output
voltage.
d.
Adjust
R7
2
until
front
panel
meter
also
indicates
maximum
rated
output
voltage.
5-75
AMMETER
TRACKING
5-76
To
calibrate
ammeter
tracking,
proceed
as
follows:
a.
If
meter
has
not
been
electrically
zeroed,
perform Step (a)
of
Paragraph
5-73.
b.
Turn
VOLTAGE
control
fully
clockwise,
and
set
METER
switch
to
low
current
range.
c.
Connect
decade
resistance
box
in
place
of
R38,
d,
Turn
on
supply
(no
load
connected)
and
rotate
CURRENT
controls
fully
ccw.
e.
Adjust
decade
resistance
so
that
ammeter
reads
zero.
f.
Tum
off
supply
and
connect
test
setup
as
shown
on
Figure
5-10.
Leave
Sl
open.
g.
Turn
on
supply
and
adjust
CURRENT
con-
trol
until
differential
voltmeter
reads
1.SVdc.
h.
Adjust
R56
until
front
panel
meter
reads
exactly
the
maximum
rated
output.
current.
5-77
CONSTA:t-J'T
VOLTAGE
PROGRAMMING
CURRENT
5-78
Zero
Output
Voltage.
To
calibrate
the
zero
Volt programming
accuracy,
proceed
as
follows:
a.
Connect
differential
voltmeter
between
+S
and
-s
terminals.
b.
Short
out
voltage
control
by
connecting
Jumper
between
terminals
A6
and
-s.
c,
Rotate
CURRENT
controls
fully
clockwise
and
turn
on
supply.
d,
Observe
reading
on
differential
voltmeter,
e.
If
it
is
more
positive
than
0
Volts,
shunt
resistor
R6
with
decade
resistance
box.
£.
Adjust
decade
resistance
until
differential
voltmeter
reads
zero,
then
shunt
R6
with
resistance
value
equal
to
that
of
the
decade
resistance.
g.
If
reading
of
Step
(d)
is
·more
negative
than
0 Volts,
shunt
resistor
RS
with
the
decade
re-
sistance
box.
h.
Adjust
decade
resistance
until
differential
voltmeter
reads
zero
then
shunt
RS
with
resistance
value
equal
to
that
of
the
decade
box.
5-79
CV
Programming
Accuracy.
To
calibrate
the
constant
voltage
programming
current,
proceed
as
follows:
a.
Connect
a 0.1%,
48K
resistor
(96K
for
Model 6209B)
between
terminals
-s
and
A6
on
rear
barrier
strip.
b.
Disconnect
jumper
between
A7
and
AB
Ueaving
A6
and
A7
jumpered)
on
rear
terminal
bar-
rier
strip.
c.
Connect
a
decade
resistance
in
place
of
R13
.
d.
Connect
a
differential
voltmeter
between
+S
and
-s
and
tum
on
supply.
e.
Adjust
decade
resistance
box
so
that
dif-
ferential
voltmeter
indicates
maximum
rated
output
voltage
within
:!::l.6Vdc for Model
62078
or 3.2Vdc
for
Model 6209B.
f.
Replace
decade
resistance
with
resistor
of
appropriate
value
in
Rl3
position.
5-80
CONSTANT
CURRENT
PROGRAMMING
CURRENT
5-81
Zero
Output
Current.
To
calibrate
the
zero
current programming
accuracy,
proceed
as
follows:
a.
Connect
differential
voltmeter
between
+S
and
-s
terminals.
b. Short
out
current
controls
by
connecting
jumper
between
terminals
Al
and
AS.
c.
Rotate
VOLTAGE
control
(s) fully
clockwise
and
turn
on
supply.
d.
Observe
reading
on
differential
voltmeter.
e.
If
it
is
more
positive
than
0 Volts,
shunt
resistor
R25
with
a
decade
resistance
box.
f.
Adjust
decade
resistance
until
differential
voltmeter
reads
zero,
then
shunt
R25
with
resist-
ance
value
equal
to
that
of
decade
resistance.
g.
If
reading
of
Step
(d)
is
more
negative
than
0 Volts,
shunt
resistor
R2B
with
decade
resist-
ance,
h.
Adjust
decade
resista
nee
until
differential
voltmeter
reads
zero,
then
shunt
R28
with
resistance
value
equal
to
that
of
decade
box.
5-82
CC Proqramminq
Accuracy. To
calibrate
the
constant
current
programming
current,
proceed
as
follows:
a.
Connect
power
supply
as
shown
in
Figure
s-10.
b.
Remove
strap
between
A3
and
A4
(leaving
A4
and
AS
jumpered).
c.
Connect
a
0.1%,
15K
resistor
between
Al
and
AS,
d.
Connect
decade
resistance
box
in
place
of
R19.
e.
Set
METER
switch
to
highest
current
range
and
turn
on
supply.
f,
Adjust
the
decade
resistance
so
that
the
differential
voltmeter
indicates
1.5
:1::
D.lSVdc.
g.
Replace
decade
resistance
with
appropri-
ate
value
resistor
in
Rl9
position.
5-83
REFERENCE
CIRCUIT
ADJUSTMENTS
5-84
Line Regulation. To
adjust
the
line
regulation
capabilities
of
the
instrument,
proceed
as
follows:
a.
Connect
the
differential
voltmeter
betweer.
+S
(common)
and
33
(positive).
b,
Connect
variable
voltage
transformer
be-
5-15