Fluke 6060B - Power Supply Voltage Checks

MAINTENANCE
TROUBLESHOOTING
AND REPAIR
CAUTION
To
prevent
damage
to the
Generator,
turn
otf the
instrument
before
removing
any
PCAs.
4D-24.
Check
Power
Supply
Voltages
CAUTION
To
prevent
damage to the
Generator, turn off
the
Instrument
before
disconnecting
any
power
distribution
cables.
Check
all power
supply
voltages.
Table 4D-8 gives
the expected dc
and
ripple
voltages
at
key test
points. If
one supply
voltage is unusually
low,
this could
indicate an
abnormal
load
on
that supply
due to a
fault.
To isolate the
fault,
check the
abnormal voltage
before
and
after
disconnecting
(one at a
time) the
power
cable to the
Controller,
Synthesizer,
Attenuator, and
the cable
from
the
Controller
to the front
panel.
Table
4D-8 lists
the typically
dc
and ripple
voltages
(relative to
ground
connection
on the
module
plate)
at
the key
test
points of the
Power Supply,
A3A1, PCB.
These
characteristics
apply
for [RCL]
[9][8].
The
unregulated
dc
and ripple
voltages are those
expected with a
line
voltage of
I20V
ac
at
60 Hz.
The dc
voltages
are expected
values as measured
with a digital
voltmeter
with
respect to the
power
supply
ground
connection on the
module
plate.
The
ripplp voltages
are expected
values as
measured
with an
oscilloscope
with
respect
to
the power
supply
ground
connection
on the module
plate,
and are
the
peak-to-peak
values
of
the
120-Hz waveform.
The
characteristics
of
the
unregulated
+18V relay
supply
depend
directly on
the
line
voltage
and
the load
(the state of
the instrument). For
example; at
120V ac:
At
50 MHz and
1
3
dBm, Vdc
is
typically
19.0V with .25V
(peak-to-peak)
ripple.
•
At 50
MHz and RF
off, Vdc is
typically 20.0V with
OV
ripple.
Table 4D-8. Power
Supply
Characteristics
SUPPLY
UNREGULATED
VOLTAGES
REGULATED
VOLTAGES
aiP
V dc
RippLeCVpp)
aiP
V
dc
RippteCmVpp)
+37 9
47
0.5
5
36.9 to
37.1
2
+15
Syn
22
0.5
11
14.5 to
15.7
0,5
+15
Out
7
3
M II
(•
“15
8
-23
0.2
2
-14.5 to
-15-7
It
+5
10
9
1
4
4.75 to
5.25 1
+18
1
23
0.35
None
None
None
40-9