Operating Instructions—7D14
This
is the mode normally used for EXT GATE applications
when counting
a
number of events within short, repetitious
gate
times. The advantage of
using the storage ON
mode is
that no
display flicker is observed during the count cycle.
The
last
measurement taken remains displayed
until
the
next measurement has been completed
and
is
ready to be
displayed.
This is the same mode used when making fre
quency
measurements with the gate time determined by the
1
ms through 10 s pushbuttons.
In
the storage OFF mode, each
count is displayed as it
occurs;
thus, the display always indicates the total count at
that time.
This mode
is normally
used with MANUAL
GATE
operation
when counting a number of events over a
relatively
long, indefinite time. A typical application would
be
counting items
passing a transducer on an assembly line.
Display
Time.
In
the usual application (MANUAL
GATE
operation
only),
in which pulses are counted over
one
interval only, the DISPLAY TIME control functions in
its
usual manner;
i.e., the display will
be reset to zero after
the
display time
has elapsed. However, if it is desired to add
one
interval to the next (totalize the count), the DISPLAY
TIME
control should be set to
∞
. The
same effect will be
obtained whenever
another gate interval is initiated
before
the
display time has elapsed.
In
EXT GATE applications, where the gate times are
repetitious,
the external gating
signal is locked
to the dis
play
timer circuitry. Thus, after one measurement has been
taken,
another
gate
interval will not be
initiated until the
completion
of
either the
display time or the gate "off"
time,
whichever is longer. In
this
way, one interval is not
added to another.
Using
the MANUAL
GATE.
To make
a
count measure
ment
using
the
MANUAL
GATE ON/OFF pushbuttons,
proceed
as follows:
1.
Set the
internal
MAN GATE STORAGE
switch for
the desired
mode. (The OFF position is usually used
for
long
gate intervals.)
2.
Install
the 7D14 in any available plug-in compart
ment
of the
Tektronix 7000-series oscilloscope.
3. Turn
the oscilloscope power on.
Allow about 20
minutes warmup.
4.
Advance
the
oscilloscope Readout control to obtain a
usable readout
display.
5. Connect the
input
signal to the CH A INPUT
connector.
6. Set the
INPUT SENS/P-P VOLTS, COUPLING, BW,
and
TRIGGER LEVEL/SLOPE
controls as necessary
to
obtain
a
steady count.
7. Set
the DISPLAY TIME control
to 00 (fully clock
wise).
8.
Depress
the
MANUAL GATE ON pushbutton and
the
counter will
start counting. If necessary,
press the
RESET
pushbutton so that the count will start from zero.
9.
To
terminate
the count,
depress the OFF button.
Using
the
External Gate.
To
make
a count
measurement
using an external
gating signal,
proceed
as follows:
1.
Set
the
internal Man Gate Storage switch for the de
sired
mode.
(The ON position is
usually used for short
gate
intervals.)
2. Install the 7D14 in any available plug-in compartment
of
a Tektronix 7000-series oscilloscope.
3.
Turn
the
oscilloscope power on. Allow about 20 min
utes
warmup.
4.
Advance the oscilloscope Readout
control
to obtain
a
usable readout
display.
5.
Connect
the input signal to the CH A INPUT
connector.
6.
Connect
the
external gating signal to the
EXT GATE
input connector
through
the BSM to
BNC
male adapter
(supplied
accessory). The external gating signal must meet
the input
requirements as given in Section 1 of this manual.
7.
Set the
7D14 TRIGGER controls
as necessary to
obtain
a
steady count.
The
external gate function
can be used in conjunction
with
a delayed sweep to count the quantity of
pulses within
a
burst. The
7D14 external gate input is driven by
the
delayed-sweep
gate
output
to count the
number of pulses
within the
delayed-sweep time (intensified
zone). To use
this
function,
proceed as follows:
1.
Set
the internal Man
Gate Storage
switch for the de
sired
mode. (The ON position is usually used for short gate
intervals.)
®î
2-9
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 ...