Calibration—
7D14
b. Set the
amplifier unit for a vertical
deflection factor
of 50 mV/division.
c. Connect the
high-frequency constant-amplitude sine
wave
generator to the amplifier unit input through the five-
nanosecond
GR cable, 10X GR attenuator, and 50-ohm
in-line
termination.
d.
Set
the high-frequency generator for a two-division
display
at the 3-MHz
reference frequency.
e.
Disconnect the
high-frequency generator from the
amplifier
unit input.
f. Connect the generator to the
CH A INPUT through
the
five-nanosecond GR cable, 10X GR attenuator, and GR
to
BNC male adapter.
g.
Set
the
high-frequency generator for a 120-megahertz
output.
h.
CHECK
—Readout
display for
a steady count of
about
120 MHz.
i.
Connect the digital
voltmeter between test point 326
and
chassis
ground.
j.
Adjust the
Ref Voltage adjustment R320
as far clock
wise
as possible without significantly changing the
120-MHz
count;
note
the
voltmeter reading.
k. Adjust
the Ref Voltage adjustment
R320
as far
counterclockwise
as possible without significantly changing
the
120-MHz count; note the voltmeter reading.
l.
ADJUST
—Ref
Voltage
adjustment R320 for a volt
meter reading halfway
between the readings obtained in
parts
i and j of this step. For example, if the
upper volt
meter reading is
—3.70 volts and the lower voltmeter
reading is
—2.90 volts, the difference between the two is
—0.80 volt. Adjust R320 for the lower reading plus one-half
the
difference
or —3.30 volts.
m.
Disconnect all test equipment.
5.
Adjust
High-Frequency
Compensation
a.
Set
the amplifier
unit for
a vertical
deflection factor
of
10 mV/division.
b.
Connect
the high-frequency generator to
the ampli
fier
unit input through the five-nanosecond GR cable,
10X
GR
attenuator, 2X
GR attenuator, and 50-ohm in-line
termination.
c. Set the high-frequency generator for
a five-division
(50
millivolts) display at the
3-MHz reference frequency.
d.
Disconnect the
generator
from the amplifier unit
input.
e.
Connect
the generator to the CH A INPUT
through
the five-nanosecond
GR cable, 10X GR
attenuator, 2X GR
attenuator, and GR to
BNC male adapter.
f.
Set
the
generator for a 500-MHz output.
g.
Check
—Readout
display for a
count of about 500
MHz.
h.
ADJUST-C150 for a 500-MHz
count.
i.
Disconnect all test equipment.
j. Replace
the Indicator
oscilloscope right cover.
5-15
Summary of Contents for 7D14
Page 4: ...7D14 ...
Page 11: ...Operating Instructions 7D14 Fig 2 1 7D14 front panel controls and connectors 2 2 ...
Page 33: ... 3 13 Fig 3 11 Logic diagram for Zero Cancel Logic stage Circuit Description 7D14 ...
Page 38: ...3 18 Fig 3 16 Time Base and Control circuit detailed block diagram Circuit Description 7D14 ...
Page 44: ...NOTES ...
Page 46: ...NJ Fig 4 1 Electrode configuration for semiconductors in this instrument I ...
Page 68: ...NOTES ...
Page 96: ... 7DI 4 DIGITAL COUNTER UNIT ...
Page 98: ...GRS 0371 BLOCK DIAGRAM ...
Page 99: ......
Page 103: ...0 0 I 200 mV 500 µs 0 001 200 mV 500 µs 0 001 MHz 00 mV E 00 µs 0 001 MHz ...
Page 106: ...1 ...
Page 110: ...A2 Logic Circuit Board Assembly jQ798i 798 jc743 CR744t uni R724 R742 JL744S FrR796 ...
Page 113: ......
Page 114: ...P 0 A2 LOGIC BOARD ...
Page 121: ... A B D t F H J NPR Tj ZWX V A AC M AEA HUM qAZ DEF HJ N P R S T J V V7X y ABM APAI AA 7DI4 ...
Page 129: ......
Page 130: ...4 7D14 DIGITAL COUNTER ...