Tektronix 067-0539-00 Datasheet with schematics

067-0539-00 CALIBRATION FIXTURE

Input Normalizer 24 pF IBNCI

REF.
NO.

A

PART NO.

067-0539-00

SERIAL MODEL NO. a

EFF. DISC.

T

Y.

DESCRIPTION

An Input Time Constant Normalizer for signal inputs

having a

nominal 1 megohm x 24 pF RC time constant and

having BNC connectors.

DATA SHEET NO.

062-0836-00

APRIL 1967

Copyright © 1967,
Tektronix, Inc.
All Rights Reserved.

OSCILLOSCOPE INPUT NORMALIZERS

Input Normalizers are used for checking or ad­justing the input capacitance of oscilloscopes,

or

oscilloscope plug-in units, where high-impedance
attenuator probes may be used. In a sense they
are dummy probes. Input capacitance should be
adjusted for each setting of the input attenuator
switch, so that you will not need to readjust an
input probe each time the attenuator setting is
changed.

Different oscilloscope types have different nominal
values of input capacitance, so require different
input normalizers. The Instruction Manual for each
Tektronix Oscilloscope identifies which normalizer
should be used, if any, and how to use it.

An instruction manual may refer to an Input Nor­malizer as a Capacitance Standardizer, a Time

Constant Standardizer, or as an RC Standardizer.
The name was changed to Normalizer to reduce
confusion about whether they should be considered

a measurement Standard. The Tektronix part num­ber was changed at the same time.

Input Normalizers are not intended to be used to
determine whether input capacitance is withincer­tain limits, or whether the RC product of input
resistance and input capacitance is within certain
limits. Therefore, they are not intended to be
measurement Standards. Furthermore, it is not

advisable to attempt to maintain the input capac­itance or the input RC time constant on different
scopes to tight tolerances with the hope of ob­viating the need to check or adjust a probe when
it is used with a different oscilloscope. Proper
probe adjustment should always be checked each
time a probe is connected to a different oscillo­scope or plug-in unit. When this practice is

observed, fewer measurement errors will~ made
than can be prevented by a rigorous proiam to
maintain speclfic tolerance limits. Nor

11 it ad-

visable to rely on a known input capacitanc1, mea­sured at one frequency, to calculate the in~t load­ing effects on a signal having a different fre!uency.

Most Tektronix Input Normalizers never med to be
adjusted after they leave the factory. Performance
is tested each time one is used, and nirrnall Y
should be considered adequate as long asihe ad­justable input capacitors in the oscillosco~rs have
sufficient range.

If readjustment should be necessary, the [11ternal

resistor should first be measured to be sure it
is in tolerance. Then the internal variablecapac­itor may be adjusted to produce a square-cirnered
flat-topped response to a square-wave s!plal on

an oscilloscope it is designed to

be usid with,

in the same way as described in the insttuctions
for adjusting scope input capacitance. The risponse
of the scope to square waves should first

to be normal, and the input capacitanci to the

Ii? known

scope should be known to be within about!ive per
cent of its nominal value at the attenuator setting
used. It is normal for input capacitanceto vary
slightly from one setting

to the next to correspond

with slight variations of input resistance. A Tek­tronix Type

130 L-C Metermaybeusedto J11easure

the scope input capacitance. Measurement should
be made while the scope is operating. Whm using
the Type

130, to avoid a small possibility of a

measurement error due to overdriving tbe input,
it is a good idea to use an attenuator setting that­corresponds to a deflection factor of aboilt

1 volt

per division.

1

A

MECHANICAL PAR.TS LIST-067-0539-00

i

I

©--1·

FIG. & TEKTRONIX
;~~EX PART NO.

1
2

3

4

5

6

7

8

9

10

11

12
13
14

131-0126-00
210-0962-00
202-0095-00
214-0271-00

213-0075-00
352-0045-00
200-0752-00

213-0088-00

131-0428-00
132-0081-00

166-0217-00
214-0109-01

358-0072-00
134-0044-00

SERIAL/K>DEL

EFF DISC

Q

T

y

1 CONNECTOR, coaxial, BNC, single contact
1

WASHER, bevel, plastic

1 OOX, normalizer
1 BUTTON, plastic
2 SCREW, set, 4-40 x 3/32 inch, HSS
1 HOLDER, insulating cap
1 COVER, normalizer

- mounting hardware: (not included w/cover)
2 SCREW, thread forming, #4 x 1/4 inch, PHS

1 ASSEMBLY, connector, BNC

assembly includes:
1 NUT, BNC
1 TUBE, spacer, insulator, 5/8 inch long
1 PIN, contact, male
1 BUSHING, insulator, 0.323 inch long
1 PLUG, probe, BNC

DESCRIPTION

A

2

ELECTRICAL PARTS LIST-067-0539-00

i-

i

Cl

2-8 pF

I

I

I

I

I 1 Mn I

~

INPUT¥------t1t-,._ _ _, __ ,.._--1._.---~ OUTPUT

Rl I

1/2 W

I

I

I

I

I

~

I I
I

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: ______

C2

~P~

___ ,

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Values are fixed unless marked Variable.

TEKTRONIX

CKT. NO. PART NO.

Cl
C2

Rl

3

281-0060-00
281-0511-00

323-0481-00

SERIAL/MODEL NO.

EFF DISC

Capacitors

Resistor

2-8 pF, Var
22 pF

1 Mn

DESCRIPTION

Cer
Cer

1/2 W

Pree

500

V 10%

1%

A