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3. Connect the male end of the BNC tee to the channel
1
input of the
HP 1652B/1653B oscilloscope.
4.
In the
System Cdnfiguration
menu, turn both State/Timing
Analyzers off and
turn the oscilloscope on as in figure 3-42. Refer to steps a through d if you
are unfamiliar with menus.
System Configuration
Figure 3-42. System Configuration
for Input Resistance
a. Move the cursor to the Type field of
Analyzer 1
and press the SELECT
key .
b. Set the analyzer Type to Off using the cursor and SELECT
key.
c. Repeat steps a and b for
Analyzer 2.
d. Move the cursor to the
On/Off
field of the
Oscilloscope
and press the
SELECT key to turn the oscilloscope
On.
5. Press the TRACE/TRIG
key and use the cursor and SELECT
key to set the
Run Mode
to
Single.
6. Press the FORMAT/CHAN
key and use the cursor and SELECT
key to set
Input
to
CH
1.
7.
Set the
Impedance
to
1 MOhm
and press RUN.
The multimeter
should read
lMS2
rtlOkSZ.
8.
Set the
Impedance
to 50
Ohms
and press RUN.
The multimeter
should read
50 Q 20.5 s2.
9. Repeat steps 3,6,7, and 8 for channel 2.
Note
11 I s
Failure of this test indicates a faulty attenuator if resistance is out of specifications.
The oscilloscope assembly also may be at fault if input resistance cannot be
changed. See troubleshooting
in section 6C for more information.
Performance
Tests
3-36
HP
16528/1653B
Service
Manual
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