Power Supply Frequency Adjustment Location; Switching Waveform - Agilent Technologies 4284A Service Manual

0 0
Fig ure 2-4. Power Supply Frequency Adjustment Location
5. Set the Oscilloscope controls as follows.
I N PUT
T I M E BASE Range:
6.
Turn the H P 4284A ON .
7. Adjust A1 R 1 9 (FREQ-ADJ) until th e period (T), o f th e waveform , is 1 2 .5 u s
us, as shown in Figure 2-5 . Figure 2-4 shows A1 R 1 9 ' s location.
[ ]
Graph 1
1:
Selected
X
Cursor X
V
1.29
12.20
f.lS
Cursor a
V
11. 0
24.20
IlS
GND
Cursor a-x
9.68 v
12.00
IlS
A1R19
(FREQ-ADJ)
0
A1BOARD
Range: 40 V
1 0 V
Offset:
Coupling: DC, 1 MQ
US
50
V/div
5.00 10.0
1 2.5 us
Figure 2-5. SWitching Waveform
2-1 1
A1R19
(FREQ-ADJ)
V /d
5.00 f.ls
±
0.5 us
AHP12
000 r 000
(GND)
AHP11
±
0.5
v
i 0.000
S