Table of Contents
Advertisement
Model 5308A
Operation
SECTION IX H
5308A 75 MHz TIMER/COUNTER
SUBSECTION Ili
OPERATION
9H-3-1.
INTRODUCTION
9H-3-3.
OPERATING INFORMATION
9H-3-4,
The front panel contains a FUNCTION selec-
tor,
a TIME
BASE
selector and signal conditioning
controls for use with the Channel A and Channel B
input
connectors.
The
signal
conditioning
controls
are labeled LEVEL A and LEVEL B, ATTENUATORS
and AC-DC. An O/C (open/close) switch is provided
for Channel B and a SEP-CHK-COM B switch is pro-
vided for selecting channel inputs and self check func-
tion. The purpose and use of these controls is described
in the following paragraphs.
9H-3-5.
Function Selector
9H-3-7.
Time Base Selector
9H-3-8.
The TIME BASE selector provides gate time
control for frequency measurements, resolution settings
for period or time interval mode, selection of number
of cycles
averaged
during
frequency
ratio,
period
average, or time interval average modes, and provides
a scaling factor of 1 to 10% in the totalize mode. The
AUTO
position automatically
sets the TIME
BASE
selection (for maximum
resolution within 1.1 second
measurement
time) for frequency gate time, and for
number
of cycles averaged
in ratio, period average
and time interval average measurements.
9H-3-9.
Signal Conditioning Controls
9H-3-11. ATTENUATORS. X1 and X10 positions (both
channels). The X10 position of the attenuator switch:
is used to attenuate large amplitude signals. The XI
position represents no attenuation. The switch setting
X10 increases the trigger levels and hysteresis voltages
by a factor of 10. Ifinput signal levels are unknown, the
initial measurements should be made with the attenua-
tor switches
set to X10. The
setting may
then
be
changed to X1 if necessary to obtain a stable, usable
measurement.
9H-3-12.
SLOPE
SWITCHES
(both channels). The
slope switches allow triggering on the positive slope
or
the
negative
slope
of the
input
signals
(see
Figure 9H-3-1).
9H-3-13.
LEVEL A and LEVEL B. The level controls
allow adjustment of the triggering point on the input
signal waveform. With the LEVEL controls set to the
"0" position (or to the SET position when the rear panel
"SET" TRIG LEVELS
switch is in the .0V position as
described
in
Figure
9H-3-3)
triggering
is centered
around
zero
volts.
The
voltage
range
over
which
triggering may be set is +2 volts with the attenuators
in the X1 position or +20 volts with the attenuator
switch
in the X10
position.
9H-3-14.
AC-DC
SWITCHES
(both channels). The
AC-DC switches select ac or de coupling. In AC posi-
tion with the LEVEL control set for triggering centered
around zero ac volts, the de components on the signal
have no effect. In DC position with the LEVEL control
in SET
(as described
in the preceding
paragraph)
triggering is centered around zero volts de.
9H-3-15.
0/C (open/close) Switch
9H-3-17.
SEP-CHK-COM B Switch
9H-3-1
Advertisement
Table of Contents
