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ADJUSTMENT
ADJUSTMENT
To obtain the best performance,
periodically calibrate the
unit. Sometimes, only one mode nead be calibrated, while
at other times, all modes should be calibrated.
When
one mode is calibrated, it must be noted that the
other modes may be affected
When
calibrating
all modes,
perform
the
calibration
in
specified sequence.
The following calibration required an
accurate measuring instrument and an insulated adjusting
flat blade screwdriver.
For optimum adjustment, turn the power on and warm up
this equipment sufficiently (more than 30 minutes) before
starting.
Before calibrating the unit, check the power supply voltage
and the zero of the voltmeter and ammeter.
TEST EQUIPMENT REQUIRED
The following instrument or their equivalent should be used
for making adjustment.
Multimeter
8810A
FLUKE
Oscilloscope
CS-1040
TRIO
Item
Control and setting
Specifications
PREPARATION FOR ADJUSTMENT
1) The control and switch settings listed below should be
used for each adjustment procedure.
Exceptions to these setting will be noted as occur.
2) Power cord should be correctly connected.
3) Short bar should be connected as follows.
®-¢9.
© - ©, O-@ @-@ ©-@,
®-@,
@©- O lon the front panel)
4) Heat
sink
should
be
insulated
with
respect
to
the
chassis.
5) Unless otherwise specified, set each control as follows
after completion of each adjustment.
POWER
ON
VOLTAGE
Maximum counterclockwise position
CURRENT
Maximum counterclockwise position
OUTPUT
OFF ( @ )
V/I CHECK
OFF ( # )
OVP CHECK
OFF ( # )
OVP adj. control
Maximum clockwise position
Procedure
C1 Voltage
check
Less than 10V
Connect a multimeter to measure the
voltage between C1 (+ side) and (—side).
+ 15V check
+15V
+0.5V
Connect a multimeter to measure the
voltage between OUTPUT (@) on the front
panel and + 15V test points on the AMP
unit, respectively.
Vee voltage coar- | VOLTAGE; maximum
se adjustment
clockwise position
CURRENT; maximum
clockwise position
Approx 4.5V
Connect a multimeter to measure the
voltage between collector and emitter of
the transistor on the heat sink. See Fig. 4.
dss
OUTPUT; OFF
VOLTAGE; maximum
counterclockwise posi-
tion
CURRENT;
maximum
clockwise position
Vrer Offset ad-
justment
0V+0.5mV
Connect a multimeter between OUTPUT
terminal GS) and control terminal NO.3
on the rear panel.
Vref gain adjust-
| VOLTAGE; maximum
ment
clockwise position
CURRENT;
maximum
clockwise position
——}—
10.25V +0.03 V
Connect a multimeter between OUTPUT
terminal ¢S and control terminal NO.3
on the rear panel.
ts
VOLTAGE; maximum
counterclockwise posi-
tion
CURRENT; maximum
clockwise position
V meter offset
adjustment
10
D type; OV +0V
Make adjustment while observing the V
meter on the front panel.
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