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Model 5304A
Operation
S E C T I O N I X D
5 3 0 4 A T I M E R / C O U N T E R
S U B S E C T I O N III
O P E R A T I O N
9 D - 3 - 1 . OPERATING INFORMATION
9D-3-2. The 5300A/5304A Timer/Counter measures
frequencies up to 10 MHz, period average to 1 MHz,
time interval from 500 nsec to 10,000 seconds; or
totalizes input signals.
Figure 9D-3-1. Signal Conditioning Using
Attenuator, Level and Slope Controls
TRIGGER
VOLTAGE
NOTE ?
RECOVERY
VOLTAGE
+ SLOPE
0 LEVEL
PSET
HYSTERESIS
(NOTE I )
- SLOPE
I. HYSTERESIS (NOISE REJECTION) VO. TAGE IS CONSTANT FOR
EACH ATTENUATOR SETTING AND DOES NOT VARY WITH
TRIGGER LEVEL
2
THIS ALLOWS ZERO VOLTS TRIGGERING WITH GOOD NOISE
REJECTION
3
ATTENUATOR: x i , x i o . x i o o CHANGES TRIGGER LEVEL AND
HYSTERESIS VOLTAGES BY FACTORS OF I . I O . I O O
9D-3-3.
There are four basic signal conditioning
controls used in Channel A or Channel B (the effect
of
these
controls
is
shown
in
Figure
9D-3-1).
These are:
a. ATTEN switches for Channel A and B.
b. SLOPE switches for Channel A and B.
c. LEVEL controls for Channel A and B.
d. AC-DC switches for Channel A and B.
9D-3-4.
ATTEN.
XI, X10, XI00 switches (both
Channels. Large amplitude signals can be attenuated
by using the ATTEN switches. Setting the attenuator
switches
increases
the
trigger
levels
and
the
hysteresis voltages by factors of 1, 10, 100. If input
signal levels are unknown, the initial measurements
should be made with the attenuator switches set
to XI00. The attenuator settings are then reduced
until a stable, useable measurement is obtained.
9D-3-5.
SLOPE Switches (both Channels).
The
slope switches allow the selection of triggering on
the positive (+) or negative (-) slope of the input
signals (see Figure 9D-3-1).
9D-3-6.
LEVEL Controls (both Channels).
The
level controls allow adjustment of the triggering
point on the input signal waveform. With the LEVEL
controls set to PSET or "0", triggering is centered
about zero volts.
The voltage range over which
triggering may be set is -1 volt
to +1 volt times
the ATTEN switch settings (±1 V to +100 V).
9D-3-7.
AC-DC Switches (both Channels).
The
AC-DC switches select ac or dc coupling.
In AC
position and PSET, triggering is centered about
ac-zero, and dc components on the signal have no
effect.
In DC position and PSET, triggering is
centered about 0 volts dc on the signal.
9D-3-1
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