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Model 5304A

Operation

SECTION

IX D

5304A TIMER/COUNTER

SUBSECTION

III

OPERATION

9D-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:

xi,

xio.xioo CHANGES TRIGGER LEVEL

AND

HYSTERESIS VOLTAGES

BY

FACTORS

OF

I.IO.IOO

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