Agilent Technologies 4284A Service Manual page 34

O
Figure 2-4. Power Supply Frequency Adjustment Location
5. Set the Oscilloscope controls as follows.
INPUT R a n g e :
TIMEBASE Range:
6. Turn the HP 4284A ON.
7. Adjust A1R19 (FREQ-ADJ) until the period (T), of the waveform, is 12.5 us ± 0.5
us, as shown in Figure 2-5. Figure 2-4 shows A1R19's location.
Graph [ 1 ] 5 . 0 0 V / d i v
1:
X Selected
Cursor X
1.29 V
12.20 ps
Cursor 0
11.0 V
24.20 i s
Cursor 0-X GND
9.68 V
12.00 ps
A1R19
(FREQ-ADJ)
Al 30AR3
4 0 V
Offset: 1 0 V
Coupling: D C , 1 MQ
50 us
10.0 V
12.5 us ± 0.5 us
Figure 2-5. Switching Waveform
2-11
A1R19 M T P 1
(FREQ-ADJ) ( G N D
5.00 p s / d i v 0.000 s
2
)
O 0 0 0
0 0 0 O
A1TP11
CD
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