HP 654A - Page 65

FREQUENCY I
I
RANGE
00
P/O S2
P/O A2
FREQUENCY
ADJUSTABLE
OSCILLATOR
1
AUTOMATIC LEVELING CIRCUITS ( ALC)
+31V
P/0 Al
REGULATED
POWER
SUPPLIES
26V
4
654A- D- 1778A
P/0 A3
EMITTER
FOLLOWER
1
J2
Q < tr Z)UNTER OUTPUT]
82
R53
A21 7
R54
iv 17 -P
A7 008A,
OUTPUT LEVEL
o
P/O A2
BALANCED
AmpL
2
42
R5I
A3
CIO
—
_ J
P/0 83
AMPLITUDE
CONTROL
INTEGRATOR
2
V
DC
P/O Al
P/O A2
P/O
A3
AMPLITUDE
CURRENT
REFERENCE
2
P/0 A2
AVERAGE
DETECTOR
2
7V P- P
AT Odern
I
S4 OUTPUT
ATTENUATOR
BALANCED
10dB AND WB
STEPS
3
IMPEDANCE
o
AMPLITUDE
P/0 A3
METER
OFFSET
CURRENT
REFERENCE
2
P/O A3
METER
DIFFERENTIA
AMPL
2
A4
BALANCE AND
UNBALANCE
IMPEDANCE
SWITCH
3
BAL
UNBAL
—NOTES—
I. Numbers in the Block
indicates Schematic on
which the circuit appears
2. See Porograph 5-70 for
Troubleshooting information.
Figure 7-1. Block Diagram.
7-3