1
Product:
2225
SERVICE Date:
8-1-88
Change Reference:
C110888
DESCRIPTION
OPERATING INSTRUCTIONS
b. ~djust the range of the voltmeter to measure up to
30V
and connect across the DC supply (observing proper
polarity) to measure the applied voltage.
Power Source
Dc Requirement: The Option
07
requires an external
c. Switch both the
2225
oscilloscope and the DC power
dc
power
'Ource
Of
between
and
+30
V,
Max-
supply to on. Increase the DC power supply to
10V.
The
imum current consumption is
5
Amperes.
2225
oscilloscope should not power up.
Ac
Requirement: Operates from
115
volts or
230
volts
e. Slowly increase the DC power supply until the
2225
ac, within the limits specified for the standard
2225
instru-
oscilloscope
powers-up.
ment.
Loss of Ground
f. CHECK-voltmeter reads between
+
11.42V
and
+I
1.86V.
The
2225
Option
07
is grounded through the dc power
cord grounding conductor. Upon loss
of
the protective
ground connection, all accessible conductive parts,
includ-
g. Disconnect the voltmeter from the DC supply. Using
ing knobs
and controls that may appear to be insulated
the voltmeter, check that all internal power supply voltages
can render electric shock.
of the
2225
Oscilloscope are within limits. Refer to Table
5-2
located in Section
5
of the service manual for test
points and voltages.
CONNECTORS
h. lncrease the DC power supply to
30V.
An additional connector is added to the rear of the
Option
07
instrument for use with the supplied dc power
i.
CHECK-that all power supply voltages of the
2225
cord.
Oscilloscope remain within their limits.
j.
Connect the voltmeter across the DC input of the
PERFORMANCE CHECK PROCEDURE
2225
Option
07.
Slowly reduce the DC power supply to
the point that the
2225
Oscilloscope shuts down.
This procedure is used to verify proper operation of the
dc-to-dc inverter (Option
07)
against the requirements
k. CHECK-that the voltmeter reads between
+
10.44V
listed in the specifications.
and
+
10.86V
Remove the cabinet from the
2225
Oscilloscope. Refer
I.
Adjust the DC power supply to
30V.
Note the current
to the cabinet remove and replace instructions located in
drawn
from
the
supply.
the
DC
power
sup-
the Maintenance section of the service manual.
ply output voltage until the scope shuts down, checking
Equipment Required
that the current does not exceed
5
Amps at any time. set
the DC power supply to
OV
output.
DC variable power supply with
0
to
30V
@
5A
integral ammeter
m. Turn the power off on the DC power supply and
Voltmeter
0.2%
accuracy
reverse the polarity of the connections to the DC input of
the
2225
Option
07.
Switch the DC power supply on
again.
a. Set the DC power supply output to
OV
and connect it
n. CHECK-that no current is drawn while increasing
to the DC input of the
2225
Option
07
oscilloscope.
the output voltage to
30V.
Page
2
of
11
Scam
by
ARTEK
MEDL4
=-
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