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7885 Instruction
Fig.
No .
Page
Page
7B85 Delaying ~T'ime Base . . . . . . . . . . . . . .
viii
3-9
Digital Voltmeter detailed block diagram
1-1
Location of release latch . . . . . . . . . . . . . . .
1-1
(SN 8088749 & below) . . . . . . . . . . . . . . . .
3-19
1-2
Front-panel controls, connectors,
3-10
Digital Voltmeter timing diagram . . . . . . . . .
3-20
and indicators . . . . . . . . . . . . . . . . . . . . . . .
1-2
4-1
Lubrication procedure for a typical cam
1-3
Effects of LEVEL control and SLOPE
switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2
switch on crt display . . . . . . . . . . . . . . . . . .
1-9
4-2
Semiconductor lead configuration . . . . . . . .
4-4
1-4
Area of graticule used for most accurate
4-3
Inter-boar°d multi-pin connector assembly . .
4-5
time measurements . . . . . . . . . . . . . . . . . . .
1-10
4-4
End-lead multi-pin connector assembly . . .
4-5
1-5
Effect of sweep magnifier on crt display. . .
1-10
4-5
Location of pin numbers on Interface con-
1-6
(A) Delaying-sweep display produced by
necior . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6
78$5 in the A horizontal compartment. (B)
4-6
7885 troubleshooting chart . . . . . . . . . . . . .
4-8
Delayed-sweep display produced by com-
4-7
Readout board removal procedure . . . . . . .
4-12
panion time-base unit in the B horizontal
4-8
Coaxial end-lead connector assembly . . . .
4-13
compartment . . . . . . . . . . . . . . . . . . . . . . . .
1-10
4-9
Cam switch removal procedure . . . . . . . . .
4-16
1-7
Typical ,~ (differential) time operation . . . . .
1-12
4-10
Removal procedure for typical push-button
1-8
Measuring time intervals from a triggering
switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-18
event (start of sweep) to any point on a
4-11
Exploded view of circuit-board pin and ferrule 4-19
waveform . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-14
4-12
Front-panel light socket assembly . . . . . . .
4-19
1-9
Measuring rise time, fall time, period, fre-
quency, or pulse width in the ;~ (differential)
time mode . . . . . . . . . . . . . . . . . . . . . . . . . .
1-15
The illustrations in Section 8 are located near their
1-10
Magnifying a selected segment of the delay-
associated diagrarrr on the foldout pages.
ing (A) sweep in the delay-time mode with
mainframe alternate or chopped horizontal
8-1
Semiconductor lead configuration .
operation . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-16
8-2
Location of circuit boards in the 7885 .
1-11
Time-interval measurements in the delay-
8-3
A1--°-Interface circuit board assembly .
time and ,~ (differential) time mode with
8-4
A2-- .-Trigger circuit board assembly .
mainframe alternate or chopped operation .
1-17
8-5
A3----Readout circuit board assembly .
1-12
Examining an event that occurs within a se-
8-6A
A4---(SN B088750 & Up) Digital Voltmeter cir-
lected time interval after a known delay time
cult board assembly .
in the delay-time mode . . . . . . . . . . . . . . . .
1-18
8-6B
A4---(SN B088749 & Below) Digital Voltmeter
2-1
7885 dimensional drawing . . . . . . . . . . . . .
2-4
circuit board assembly .
3-1
Basic block diagram of the 7885 Delaying
8-7
A1--Interface circuit board assembly .
Time-Base unit . . . . . . . . . . . . . . . . . . . . . .
3-2
8-8
A2---_l"rigger circuit board assembly .
3-2
Detailed block diagram of Trigger Generator 3-7
8-9A
A4-_-(SN 8088750 & Up) Digital Voltmeter cir-
3-3
Functional diagram of Trigger Source Selec-
cuit board assembly .
for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8
8-98
A4n-(SN ~088749 & Below) Digital Voltmeter
3-4
Timing diagram for Gate Generator stage
circuit board assembly .
(092, 096, 098) . . . . . . . . . . . . . . . . . . . . .
3-9
8-10
Readout circuit board assembly .
3-5
Detailed block diagram of Logic circuit . . . .
3-10
8-11
Location of Sweep riming adjustments.
3-6
Timing diagram for Delay Pickoff Inhibit
8-12
Location of Triggering adjustments.
stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-12
8-13A
(SN B088750
&
Up)
Location
of
Digital
3-7
Detailed block diagram of Sweep Generator 3-14
Voltmeter adjustments.
3-8
Detailed block diagram of Pickoff Amplifiers
8-138
(SN 8088749 & Below) Location of Digital
and Delay Gate Generator . . . . . . . . . . . . .
3-17
Voltmeter adjustments.
IV
REV AUG 1981
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