4.2.4 AMMETER CALIBRATION
Set meter
function
switches
to
A (amperes) and set the current
controls
fully
clockwise. Connect the load
to
the source whose meter is under calibration.
For Source A (Meter M101)
adjust
the load current as measured on the external am-
meter
to
1.0 ampere (TP340)
or
2.S
amperes (TP343A).
Adjust
R114
trimmer
to
set
panel meter
to
agree
with
the external ammeter.
For Source B (Meter M201), proceed as before except adjust"R214 trimmer.
For Source C (Meter M301), set the
output
voltage between
SV
and 6V;
adjust
load
current
to
S amperes as measured on external ammeter.
Adjust
R334
to
set panel
meter
to
SA.
4.2.S
VOLTAGE ADJUSTMENTS
Set
front
panel VOLTAGE
controls
fully
clockwise. Connect Digital
Voltmeter
toter-
minals
of
source
to
be adjusted.
For Source A
adjust
R129
to
obtain 32.8
to
33
volts
(TP340)
or
20.S
to
20.7
volts
(Model
TP343A).
For Source B proceed as in Source A
adjusting
R229.
For Source C
adjust
R326
to obtain an-output
of
1S.6
to
1S.8
volts.
4.2.6 CURRENT LIMIT ADJUSTMENTS
Set current
limit
adjustments
fully
clockwise. Connect load in series
with
external
ammeter
to
the Source under adjustment.
For Source
A:
Set
output
voltage
to
approximately
10
VDC output. Set
trimmer
R119
fully
clockwise. Connect load thru external ammeter and set current
to
approximately
1.07 Amperes (TP340)
or
2.7
Amperes (TP343A).
Adjust
R119
slowly
counterclockwise
until FAULT lamp illuminates. Reset
output
to
1 AMP (TP340)
or
2.S
AMPS (TP343A)
and
confirm
that
lamp goes out.
For Source
B:
Proceed as before except
adjusting
R219.
For Source
C:
Set
output
voltage
to
6VDC. Set
trimmer
R311
fully
clockwise. Connect
load thru external ammeter and set current
to
approximately
S.3SA.
Adjust
R311
slowly
counterclockwise
until
FAULT lamp displays. Reset
output
current
to
SA
and
confirm
that
FAULT lamp turns off.
Readjust
output
current
to
below 1A and increase
output
voltage
to
1S
VDC. Set
R318
fully
clockwise. Increase
output
current
to
approximately 2.7SA.
Adjust
R318
slowly
counterclockwise
until
FAULT displays. Decrease current
to
2.SA
and
confirm
that
FAULT lamp
turns
off.
-7-
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