7885 Instruction
LIST OF ILLUSTRATIONS
Fig.
No.
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
1-12
2-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
iv
Page
7B85 Delaying Time Base. . . . . . . . . . . . . . viii
Location of release latch. . . . . . . . . . . . .
..
1-1
Front-panel controls, connectors,
and indicators . . . . . . . . . . . . . . . . . . . . .
..
1-2
Effects of LEVEL control and SLOPE
switch
on
crt display
.................
.
Area
of
graticule used for most accurate
time measurements
..................
.
Effect of sweep magnifier on crt display
..
.
(A) Delaying-sweep display produced by
7B85
in
the A horizontal compartment. (B)
Delayed-sweep display produced by com-
panion time-base unit
in
the B horizontal
compartment
.......................
.
Typical
t,
(differential) time operation
....
.
Measuring time intervals from a triggering
event (start of sweep)
to
any point on a
waveform
..........................
.
Measuring rise time, fall time, period, fre-
quency, or pulse width
in
the
~
(differential)
time mode
.........................
.
Magnifying a selected segment of the delay-
ing (A) sweep
in
the delay-time mode with
mainframe alternate
or
chopped horizontal
operation
..........................
.
Time-interval measurements
in
the delay-
time and
t,
(differential) time mode with
mainframe alternate or chopped operation.
Examining
an
event that occurs within a se-
lected time interval after a known delay time
in
the delay-time mode
...............
.
7B85 dimensional drawing
............
.
Basic block diagram of the 7B85 Delaying
Time-Base unit
.....................
.
Detailed block diagram of Trigger Generator
Functional diagram
of
Trigger Source Selec-
tor
...............................
.
Timing diagram for Gate Generator stage
(092,
096,
098)
....................
.
Detailed block diagram
of
Logic circuit
...
.
Timing diagram for Delay Pickoff Inhibit
stage
.............................
.
Detailed block diagram
of
Sweep Generator
Detailed block diagram of Pickoff Amplifiers
and Delay Gate Generator
............
.
1-9
1-10
1-10
1-10
1-12
1-14
1-15
1-16
1-17
1-18
2-4
3-2
3-7
3-8
3-9
3-10
3-12
3-14
3-17
Page
3-9 Digital Voltmeter detailed block diagram
(SN B088749 & below) . . . . . . . . . . . . . .
..
3-19
3-10
4-1
Digital Voltmeter timing diagram. . . . . . .
..
3-20
Lubrication procedure for a typical cam
switch.
. . . . . . . . . . . . . . . . . . . . . . . . . .
..
4-2
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
Semiconductor lead configuration
.......
.
Inter-board multi-pin connector assembly
..
End-lead multi-pin connector assembly
...
Location
of
pin numbers
on
Interface con-
nector
............................
.
7B85 troubleshooting chart.
...........
.
Readout board removal procedure
......
.
Coaxial end-lead connector assembly
...
.
Cam switch removal procedure
........
.
Removal procedure for typical push-button
switch
............................
.
Exploded view
of
circuit-board pin and ferrule
Front-panel light socket assembly
......
.
4-4
4-5
4-5
4-6
4-8
4-12
4-13
4-16
4-18
4-19
4-19
The illustrations
in
Section 8 are located near their
associated diagram
on
the foldout pages.
8-1
Semiconductor lead configuration.
8-2 Location
of
circuit boards
in
the 7B85.
8-3 A
1-lnterface
circuit board assembly.
8-4
A2-
Trigger circuit board assembly.
8-5
A3-Readout
circuit board assembly.
8-6A
A4-(SN
B088750 & Up) Digital Voltmeter cir-
cuit board assembly.
8-6B
A4-(SN
B088749 & Below) Digital Voltmeter
circuit board assembly.
8-7 A
1-lnterface
circuit board assembly.
8-8
A2-
Trigger circuit board assembly.
8-9A
A4--(SN
B088750 & Up) Digital Voltmeter cir-
cuit board assembly.
8-9B
A4-(SN
B088749 & Below) Digital Voltmeter
circuit board assembly.
8-10 Readout circuit board assembly.
8-11
Location
of
Sweep Timing adjustments.
8-12 Location
of
Triggering adjustments.
8-13A (SN B088750 & Up) Location of Digital
Voltmeter adjustments.
8-13B (SN B088749 & Below) Location of Digital
Voltmeter adjustments.
REV AUG
1981
