HP 740B Operating And Service Manual page 99

Section
vn
+ C4 + C6
1200 3S
RI3 RI4
3.6 0.33
HIGH
VOLTAGE
V==-FILTER==~
FROM FROM FROM
SIE(F-5) SIE(F-9) SIRIS
111
---2----s-'l
R21
4700
R20
4700
---~
Figure 7-9. Pulse Width Converter, 20 kHz Clock
and External Current Limit (A5) Sche-
matic and Component Location Diagram
7-19/7-20
TO
A4-20
CURRENT
LIMIT BIAS
~
_ _ _ _ IS
RI8
1800
CR6
01794-1
/ -...
-~
....
-4.pr--~+;"'-----------------"'---"'--"-~
>-
TO AIICI
6 • 16 (-OUTPUT)
I
I
I
FLOATING
12V
I===;:::I=POWER SUPPLY
~
TP9
+I0V
FROM
A6-21
+IOV
~
21 _
l'
Model 740B
CURRENT
V
LIMIT DETECTOR
~ +IOV
C8 RI7
0.01 220K
1--
--~ RI9
lOOK
FROM
AIIR4.HIGH
+9.4
VOLTAGE
06 8:.D 07
PRE-BIAS I -12 +9.6
~7 GD CB:D
FROM T4
I
C9
-11.2
-OUTPUT
I GD)
CR3
17
RI6 RIS
4700 22K
RS
4700
+IOV
RI
2700
R6
1200
+IOV
R7 R8 R9
1200 SIK S600
Vi C3
0.0039
03
+S.2
20KHZ CLOCK ~
-IOV
CR2
R4 R3
10K ISOO
CI
390PF
R2
390
*
01
--========PULSE WIDTH =========\1
V·
CONVERTER
-IOV
+6.0V
(IOOOV 20M A
OUTPUT)
740e-D-073SA
COPYRIGHT 1966 BY HEWLETT-PACKARD COMPANY
AS r;;ppARTNO.
~
ld0740-66S2S
+8.4V
~~~~R~~T~AL--<2l",-{_OV_OU_~~Pi-U_T_)
-+-01-1
AMPLIFIER
" L
OUTPUT
I
~
I
I
I
I
I
FROM A6-18---<18 L - -
IOV
-IOV
I~
I
I
*
A 5-19
~SOIJ.SEC~
3IJ.
SEC --+-i
r
I
r-~_ol'
OV OUTPUT, STD
f
3.SV
~
__t
~SOI'SEC~
1000V, 20MA OUTPUT, STD
*
Q3 COLLECTOR
l l
j
----
"'-----
2I'SEC
---.J
~
I
~SOI'SEC~
OV OUTPUT, STD
~SOI'-SEC--J
ALL RANGES AND FUNCTIONS
'1
10V
_t
~
SO/1 SEC
----..J
IOOOV, 20MA OUTPUT, STD
7408-RO
*
QI COLLECTOR
---j
20l'SEC
j--
lJr----1U_l'
'@I
N
I
I
~
0,
cr ~ I
o
0
I I
I I
I
I
01 .... I"l lD
lrlrOlr
I I I
I
22
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cr cr
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PART NO. 00740-66525
C4
NOTES: FIGURE 7-9
1. VOLTAGES INDICATED IN RED ARE MEASURED WITH FRONT PANEL CON-
TROLS SET AS FOl.LOWS:
FUNCTION: ·STD
RANGE: 1 V
VOLTAGE SET: .00000
2. VOLTAGES AND WAVESHAPES ARE REFERENCED TO
W.
FIGURE 7-3
(Top and Bottom View) SHOWS THE GROUND POINT LOCATION.
3.
GD
DENOTES VOLTAGES IN CURRENT LIMIT DETECTOR CIRCUIT WHEN
CURRENT LIMIT IS EXCEEDED (10 V OUTPUT, 100
n
LOAD). INDI-
CATED VOLTAGES WILL VARY WITH DEGREE OF OVERLOAD.
740B-0747A