Tektronix VM700A Operator's Manual - User Manual

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Operators Manual

VM700A
Probe Adapter

063-0927-00

Please check for change information at the rear
of this manual.

First Printing August 1991
Reprint September 1993

Advanced Test Equipment Rentals

www.atecorp.com 800-404-ATEC (2832)

Established 1981

United States of America. Contents of this publication may not be repro-
duced in any form without the written permission of Tektronix, Inc. Speci-
fication and price change privileges are reserved.

This instrument, in whole or in part, may be protected by one or more U.S.
patents or foreign patents or patent applications.

TEKTRONIX, TEK, PLOT 10, TEKTEST, and SCOPE-MOBILE are reg-
istered trademarks.

For further information, contact Tektronix, Inc., Corporate Offices, P. O.
Box 1000, Wilsonville, OR 97070–1000. Phone: (503) 627–7111; TLX:
192825; TWX: (910) 467–8708; Cable: TEKWSGT.

WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period

of one (1) year from the date of shipment. If any such product proves defective during this warranty period,

Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will

provide a replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expi-

ration of the warranty period and make suitable arrangements for the performance of service. Customer

shall be responsible for packaging and shipping the defective product to the service center designated by

Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if

the shipment is to a location within the country in which the Tektronix service center is located. Customer

shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products re-

turned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inade-

quate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to

repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair

or service the product; b) to repair damage resulting from improper use or connection to incompatible

equipment; or c) to service a product that has been modified or integrated with other products when the

effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU

OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VEN-

DORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR

A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DE-

FECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUS-

TOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT

BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAM-

AGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NO-

TICE OF THE POSSIBILITY OF SUCH DAMAGES.

Probe Adapter

PROBE ADAPTER

(067–1429–00 to 067–1429–05)

PURPOSE

The Tektronix Probe Adapter accessory is designed to interface a Tektronix P6109 10X probe to the
VM700A Video Measurement Set. This accessory is intended for use in manufacturing and repair
applications when internal signals of an device under test are accessible only using a high-impedance
probe. The Probe Adapter provides the impedance matching and signal gain needed to drive the 75

Ω

inputs of the VM700A.

ÎÎÎÎ

ÎÎÎ

ÎÎ

ÎÎÎÎ

ÎÎÎ

Front Panel

Rear Panel

ÎÎÎÎÎ

ÎÎ



067-1429-00

PROBE ADAPTER

INPUT

(10K PROBE)

, 20 pF

42 V PEAK MAX

LINE VOLTAGE

SET FOR 90–132V

OUTPUT

(75 OHM)

10 VA MAX

49–66 Hz

Figure 1. The VM700A Probe Adapter.

APPLICATION

When the Probe Adapter accessory is used, accurate measurement results are obtained by using the
relative-to-reference feature of the VM700A’s Measure Mode. The relative-to-reference feature
subtracts out distortions introduced by the Probe Adapter, thereby providing measurement results
that represent distortions introduced by the device under test. This feature removes the effects of the
0.3 degree differential phase and 0.3% differential gain that are inherent in the Probe Adapter, as well
as any frequency response flatness errors.

Operating Information

Probe Adapter

Frequency response flatness from 10 Hz to 100 kHz is strongly dependent on the accuracy of the probe
compensation. It is recommended that each probe be compensated to match the individual Probe
Adapter that it will be used with. This adjustment should be made by observing the effect on the
mid-field transition of a field square-wave signal.

Flatness in the 100 kHz to 10 MHz range varies a great deal between probe types. The Probe Adapter
circuitry is optimized for the Tektronix P6109 10X probe, a common low-cost probe. Other 10X
oscilloscope probes capable of driving a 1 M

Ω

, 20 pF input may be used, but they can degrade the

flatness of the frequency response.

Two additional effects of making measurements through the Probe Adapter should be noted. First, the
video signal-to-noise ratio is degraded from the VM700A’s typical 82 dB to approximately 73 dB with
the Probe Adapter. Secondly, the Probe Adapter introduces some output offset voltage and some minor
tilt effects due to ac coupling. Both of these effects are normally eliminated by the clamping
capabilities of the VM700A.

The 1 M

Ω

10X probe connector provides a high impedance signal input that produces minimal circuit

loading for the device under test. The output of the probe adapter is at 75

Ω

to match the input of the

VM700A. Use high quality 75

Ω

BNC coaxial cable to connect to the VM700A input, and terminate the

signal line with a 75

Ω

termination at the last device in the signal path as shown in Figure 2.

ÎÎ

BNC coaxial cable

Termination

P6109 10X Probe

To device under test

VM700A

Figure 2. Typical hookup for the Probe Adapter.

Probe Adapter

Operating Information

SPECIFICATIONS

The specifications given in Table 1 for gain, frequency response, and tilt are with a P6109 probe that
has been properly compensated for the Probe Adapter with which it is to be used.

Table 1

Specifications

ÁÁÁÁÁÁÁÁÁÁÁ

Characteristic

ÁÁÁÁÁÁÁÁÁÁÁ

Specification

ÁÁÁÁÁÁÁÁÁÁÁÁ

Supplemental Information

ÁÁÁÁÁÁÁÁÁÁÁ

Input Resistance

ÁÁÁÁÁÁÁÁÁÁÁ

1 M

Ω

0.5%

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Input Capacitance

ÁÁÁÁÁÁÁÁÁÁÁ

20 pF

2 pF

ÁÁÁÁÁÁÁÁÁÁÁÁ

Use a compensated probe

ÁÁÁÁÁÁÁÁÁÁÁ

Gain

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁ

From 10X probe tip, into 75

Ω

ÁÁÁÁÁÁÁÁÁÁÁ

Frequency Response

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

10 Hz to 100 kHz

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

100 kHz to 10 MHz

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Differential Gain

ÁÁÁÁÁÁÁÁÁÁÁ

≤

0.3%

ÁÁÁÁÁÁÁÁÁÁÁÁ

Measured with 1910 or VM700A

ÁÁÁÁÁÁÁÁÁÁÁ

Differential Phase

ÁÁÁÁÁÁÁÁÁÁÁ

≤

0.3

ÁÁÁÁÁÁÁÁÁÁÁÁ

Measured with 1910 or VM700A

ÁÁÁÁÁÁÁÁÁÁÁ

Output Offset Voltage

ÁÁÁÁÁÁÁÁÁÁÁ

≤

50 mV

ÁÁÁÁÁÁÁÁÁÁÁÁ

≤

10 mV at 25

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Video SNR

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

≥

70 dB rms

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁ

VM700A Noise Spectrum, un-
weighted

ÁÁÁÁÁÁÁÁÁÁÁ

Tilt (ac coupled)

ÁÁÁÁÁÁÁÁÁÁÁ

≤

1% on a 50 Hz square wave

ÁÁÁÁÁÁÁÁÁÁÁÁ

≤

5% when driven from 75

Ω

ÁÁÁÁÁÁÁÁÁÁÁ

Output Impedance

ÁÁÁÁÁÁÁÁÁÁÁ

Ω

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Line Voltage Range

ÁÁÁÁÁÁÁÁÁÁÁ

90 to 132 Vac or 180 to 250 Vac

ÁÁÁÁÁÁÁÁÁÁÁÁ

Internally set by a service person

ÁÁÁÁÁÁÁÁÁÁÁ

Line Frequency Range

ÁÁÁÁÁÁÁÁÁÁÁ

48 to 62 Hz

ÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Power Consumption

ÁÁÁÁÁÁÁÁÁÁÁ

≤

ÁÁÁÁÁÁÁÁÁÁÁÁ

Operating Information

Probe Adapter

ELECTRICAL PARTS LIST

Table 2

Electrical Parts Lists

ÁÁÁÁÁÁÁÁÁÁ

Circuit Reference

ÁÁÁÁÁ

Quantity

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Description

ÁÁÁÁÁÁÁ

Part Number

ÁÁÁÁÁÁÁÁÁÁ

C1,C2,C3,C4

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 0.1

ÁÁÁÁÁÁÁ

281-0775-01

ÁÁÁÁÁÁÁÁÁÁ

C5,C6

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 470

ÁÁÁÁÁÁÁ

290-0919-00

ÁÁÁÁÁÁÁÁÁÁ

C7,C8

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 0.47

ÁÁÁÁÁÁÁ

281-0563-00

ÁÁÁÁÁÁÁÁÁÁ

C9,C10

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 10

ÁÁÁÁÁÁÁ

290-0804-01

ÁÁÁÁÁÁÁÁÁÁ

C11,C17

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Not installed

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

C12

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 4-40pF

ÁÁÁÁÁÁÁ

281-0187-00

ÁÁÁÁÁÁÁÁÁÁ

C14

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 0.1

ÁÁÁÁÁÁÁ

285-0526-00

ÁÁÁÁÁÁÁÁÁÁ

C15

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 4700pF

ÁÁÁÁÁÁÁ

281-0772-00

ÁÁÁÁÁÁÁÁÁÁ

C16

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Capacitor, 10pF

ÁÁÁÁÁÁÁ

281-0811-00

ÁÁÁÁÁÁÁÁÁÁ

CR1

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diode Bridge

ÁÁÁÁÁÁÁ

152-0585-00

ÁÁÁÁÁÁÁÁÁÁ

CR2

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diode

ÁÁÁÁÁÁÁ

152-0246-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Fuse 0.1 A, 250 V, 3AG Medium Blow

ÁÁÁÁÁÁÁ

159-0171-00

ÁÁÁÁÁÁÁÁÁÁ

F2, F3

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Fuse, self-healing, RXE020, 0.2 A

ÁÁÁÁÁÁÁ

307-1593-00

ÁÁÁÁÁÁÁÁÁÁ

FL1

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Line Filter

ÁÁÁÁÁÁÁ

119-1946-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Connector, Wire Set

ÁÁÁÁÁÁÁ

198-5783-00

ÁÁÁÁÁÁÁÁÁÁ

J2,J4

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Connector, BNC Female

ÁÁÁÁÁÁÁ

131-3379-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Connector, Sq Pin Jumper

ÁÁÁÁÁÁÁ

131-0993-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Transistor, 151-1031-00

ÁÁÁÁÁÁÁ

151-1031-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 464.0K

Ω

ÁÁÁÁÁÁÁ

322-3449-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 1.00M

Ω

ÁÁÁÁÁÁÁ

321-0481-07

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 402.0

Ω

ÁÁÁÁÁÁÁ

322-3155-00

ÁÁÁÁÁÁÁÁÁÁ

R4,R6

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 200.0

Ω

ÁÁÁÁÁÁÁ

322-3126-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 374.0

Ω

ÁÁÁÁÁÁÁ

322-3152-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 75.0

Ω

ÁÁÁÁÁÁÁ

322-3085-07

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 1.15K

Ω

(0.1%)

ÁÁÁÁÁÁÁ

321-0199-07

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 7.32K

Ω

ÁÁÁÁÁÁÁ

322-3276-00

ÁÁÁÁÁÁÁÁÁÁ

R10

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 50.5

Ω

ÁÁÁÁÁÁÁ

321-1068-07

ÁÁÁÁÁÁÁÁÁÁ

R11

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 100.0

Ω

ÁÁÁÁÁÁÁ

322-3097-00

ÁÁÁÁÁÁÁÁÁÁ

R12

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 50

Ω

Variable

ÁÁÁÁÁÁÁ

311-2226-00

ÁÁÁÁÁÁÁÁÁÁ

R13

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Resistor, 10.0

Ω

ÁÁÁÁÁÁÁ

322-3001-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Transformer, 120-14ASIG

ÁÁÁÁÁÁÁ

120-1905-00

ÁÁÁÁÁÁÁÁÁÁ

TP1,TP2,TP3,TP4,TP5, TP6

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Terminal, Test point

ÁÁÁÁÁÁÁ

214-4085-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

IC, MC7815

ÁÁÁÁÁÁÁ

156-0312-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

IC, MC7915

ÁÁÁÁÁÁÁ

156-0527-00

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

IC, CLC404

ÁÁÁÁÁÁÁ

156-3962-00

ÁÁÁÁÁÁÁÁÁÁ

VR1,VR2

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Zener, 10V

ÁÁÁÁÁÁÁ

152-0149-00

ÁÁÁÁÁÁÁÁÁÁ

VR3,VR4

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Zener, 6.2V

ÁÁÁÁÁÁÁ

152-0166-00

Probe Adapter

Operating Information

INTERNATIONAL POWER CORDS

Power cords are provided to match a variety of mains connections throughout the world. See Table 3 for
plug configurations, typical use, and Probe Adapter part number to order. A separate part number has
been provided to permit the customer to order the Probe Adapter with the power cord needed for their
application. Probe Adapters ordered for countries having 220V AC power are internally set for 220V
operation and have a label affixed on the rear panel to that effect.

Table 3

Probe Adapter Part Numbers

Plug Configuration

Typical Use

Probe Adapter Part Number

United States 115V

067–1429–00

European 220V

067–1429–01

United Kingdom 240V

067–1429–02

Australian 240V

067–1429–03

North American 240V

067–1429–04

Switzerland 220V

067–1429–05

A 6 Ampere, type C fuse is also installed inside the plug of the United Kingdom power cord.

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PROBE ADAPTER

VM700A PROBE ADAPTER

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