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Model 53084.
Operation
TRIGGER
VOLTAGE
\
\
RECOVERY
VOLTAGE
+ SLOPE
=
O LEVEL
HYSTERESIS
PSET
(NOTE
E)
nn
ha
— SLOPE
HYSTERESIS
(NOISE REJECTION}
VOLTAGE
IS CONSTANT
FOR
EACH ATTENUATOR
SETTING AND DOES NOT
VARY
WITH
TRIGGER
LEVEL
THIS ALLOWS
ZERO
VOLTS TRIGGERING
WITH GOOD
NOISE
REJECTION
ATTENUATOR:
X1, X10 CHANGES
TRIGGER
LEVEL
AND
HYSTERESIS
VOLTAGES
BY FACTOR
OF 1, 10,
Figure 9H-3-1.
Signal Conditioning Using
Attenuator, Level and Slope Controls
SH-3-1S.
MODES
OF OPERATION
9H-3-20. The 5308A provides seven modes of operation
in addition to a self-check function and a stopwatch
function. Some
modes of operation are available on
both
channels
(A
or
B) while
other
modes
are
available
on
only
one
channel.
In all cases,
the
modes
are selected by the FUNCTION
switch. The
modes and functions are:
a.
Frequency Mode (Channel A or B).
b.
Frequency Ratio Mode (Channel A/B).
c.
Period Mode (Channel B only).
d.
Period Average Mode (Channel B only).
e.
Time
Interval
Mode
(Channel
A to B or
Channel B only).
f.
Time Interval Average Mode (Channel A to B
or Channel B only).
g.
Totalize Mode (Single or two channel).
h.
Self Check Function.
i.
Stopwatch Function.
9H-3-2
9H-3-21,
Frequency Mode (Channel A or B)
9H-3-22,
Frequency measurements may be made on
|
Channel A or B from 0 to 75 MHz. Front panel controls
are set to the same relative positions for measurements
on either channel with the exception that the SEP-
CHK-COM B switch is set to SEP for Channel A and to
COM B for Channel B measurements. The LEVEL A
control adjusts the triggering point on the input signal
for Channel A or Channel B in the frequency mode.
Accuracy is +1 count + time base accuracy.
9H-3-23.
Frequency
Ratio Mode (Channel A/B)
9H-3-24.
The frequency ratio of Channel A signals
(from 0 to 75 MHz) to Channel B signals (0 to 5 MHz)
can
be measured.
The TIME
BASE
switch setting
(1 to 10°) selects the number of cycles of the Channel B
signal over which the ratio A/B is averaged. Accuracy
is +1 count of Frequency A + trigger error of Frequency
B. Increasing
the number
of cycles of Frequency B
(higher
setting
of TIME
BASE
switch)
results
in
increased accuracy.
9H-3-25.
Period Mode (Channel B)
9H-3-27.
Period Average Mode (Channel B)
9H-3-28.
The period average mode allows multiple
period averages to be made with frequencies of 0 to
5 MHz into Channel B. The number of periods to be
averaged is selected by the TIME BASE switch (1 to
105). Accuracy is #1 count + time base accuracy + trigger
error. The + 1 count and
trigger error is reduced in
proportion to the number of periods averaged.
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