Triplett 2000 Manuel utilisateur

84-873

7/07

Type 3

Railroad Test Sets

Instruction Manual

Model 2000

Model 2001

Model 2002

Model 2003

2000

Series

TRIPLETT

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Page 2

SAFETY RULES

Warning

This Tester has been designed with your safety in mind. However,

no design can completely protect against incorrect use. Electrical

circuits can be dangerous and/or lethal when lack of caution or poor

safety practices are used.

Read the Manual

Read this Instruction Manual carefully and completely. Voltages and

currents within the capability of this test equipment can be hazard-

ous. Follow the instructions in this manual for every measurement.

Read and understand the general instructions before attempting to

use this tester. Do not exceed the limits of the tester.

Safety Check

Double check the switch setting and lead connections before mak-

ing measurements. Are you following all of the instructions? Dis-

connect the tester or turn off the power before changing switch

positions. Do not connect to circuits with voltage present when

switch is in any ohms or current position. When replacing fuses, use

only specified type fuses and insert in correct fuse holder.

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Page 3

Don't Touch

Don't touch exposed wiring, connections, or other "live" parts of an

electrical circuit. If in doubt, check the circuit first for voltage before

touching it. Turn off the power to a circuit before connecting test

probes to it. Be sure there is no voltage present before you touch

the circuit. Do not use cracked or broken test leads.

High Voltage Is Dangerous

Always start with the power off. Be sure there is no voltage present

before making connections to the circuit. Don't touch the tester, its

leads, or any part of the circuit while it is on. Before disconnecting

the tester, turn the circuit off and wait for the meter to return to

"zero".

Distribution Circuits Pack a Punch

In high energy circuits such as distribution transformers and bus

bars, dangerous arcs of explosive nature can occur if the circuit is

shorted. If the tester is connected across a high energy circuit when

set to a low resistance range, a current range, or any other low im-

pedance range, the circuit is virtually shorted. Special equipment

designed for use with these circuits is available. Contact a qualified

person for assistance before attempting to make measurements on

any high energy circuit.

Safety Is No Accident

Note: Specifications subject to change without notice.

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Page 4

TABLE OF CONTENTS

SAFETY RULES 2

1.0 INTRODUCTION 6

2.0 PRODUCT FEATURES 8

2.1 Code Measurements 8

2.2 The Cab Filters 10

2.3 Auto-Polarity 10

2.4 Power Supply Features 10

3.0 PREPARATION FOR USE 12

3.3 Meter Mechanical Zero 13

3.4 Visual Inspection of the Test Set 14

3.5 Visual Inspection of the Test Leads 14

3.6 Battery and Fuse Test 15

3.7 Battery and Fuse Replacement 18

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4.0 GENERAL OPERATION 20

5.0 OPERATION 22

5.1 Measuring AC and DC Voltage 22

5.2 Measuring DC milliAmps 24

5.3 Measuring DC and AC Amps 26

5.4 Measuring Resistance 28

5.5 Measuring Dry Contacts 32

5.6 Measuring DC Pulse Code Signals 33

6.0 SPECIFICATIONS 34

6.1 Electrical Specifications 34

6.2 Physical Specifications 43

7.0 ACCESSORIES, PARTS, AND SERVICE 44

8.0 LIMITED WARRANTY 48

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Page 6

1.0 INTRODUCTION

1.1 Package Contents

The standard shipping package contains the following items:

Test Set

Test Leads

This Instruction Manual

Carrying Case with Strap

Spare Fuses

Two, 9V Alkaline Batteries

One, D-cell Alkaline Battery

1.2 Product Description

The Model 2000 Series of Railroad Test Sets are specialized VOM's

designed for measuring the signal parameters of railroad coding

equipment. They maintain compatibility with older technologies,

while at the same time, offering functions and features not found on

standard VOM's.

1.2.1 Easier to Use for Normal Operation

Fewer jacks, more ranges, and a logical layout of the front panel all

contribute to the Test Sets' ease of use. The use of a multi-turn

Ohms Adjust Control facilitates accurate resistance measurements.

Also, the measurement of relay contact on time requires no adjust-

ments.

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1.2.2 Measurement of Code Parameters

The measurement of code parameters has been made simple and

accurate. No longer is it necessary to count pointer swings to mea-

sure code rate. On time can be measured on live signals as well as

relay contacts. Peak levels can be determined quickly and auto-

matically. Adjustment to the code equipment peak level can also be

made without constantly readjusting the Test Set.

1.2.3 Expandable

Optional circuit boards may be installed to allow for the filtering of

60 Hz, 100 Hz, 200 Hz, or 250 Hz cab signals. The base unit may be

upgraded at any time to include these filters without loosing the

initial investment.

1.2.4 Four Models

The 2000 Series currently consists of four models. The base Model

2000 has all the features mentioned above with the exception of the

Cab Filters. The Model 2001 includes selectable 100 Hz and 250 Hz

Cab Filters. The Model 2002 includes selectable 100 Hz and 200 Hz

Cab Filters. The Model 2003 includes selectable 60 Hz and 100 Hz

Cab Filters.

1.2.5 Selectable DC Amps Polarity

The DC Amps function has selectable polarity. This is useful for mea-

suring the transmit and receive currents in pulse coded track cir-

cuits.

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Page 8

2.0 PRODUCT FEATURES

2.1 Code Measurements

Code parameters may be directly measured with the Test Set. These

code measurements are active in any AC or DC voltage or current

range, as well as the Dry Contact function. These functions are se-

lected by placing the Code Function Switch in the desired position.

The Pointer will momentarily return to zero and then indicate the

appropriate reading. If the Range Switch or any other switches are

changed, then the measurement circuitry is automatically reset and

made ready for the new measurement.

2.1.1 Peak Hold

This function will capture and hold the peak level of the signal. If the

peak level of the signal is varying slightly, the Test Set will average

25 of these readings to give an average peak level. For DC func-

tions, the polarity of the peak is also captured and displayed using

the NEG Indicator. For the Dry Contact Range, Peak Hold will cap-

ture and hold a momentary contact closure.

CAUTION: The 2000 Series Type 3 will continue to read out the

averaged value of the last captured measurements, even after the

signal has been removed. The value will continue to be read out

until a new signal is captured or the Test Set is reset by changing

the setting of the Code Function switch or the Range switch.

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Page 9

2.1.2 Peak Follow

This function is similar to Peak Hold, except the peak measurement

will follow the peak level automatically, even if it is decreasing. This

permits easier adjustment of peak levels. No averaging is performed,

so if the peak level is varying, the Pointer will follow it.

WARNING: The 2000 Series Type 3 will continue to read out the

value of the last captured measurement, even after the signal has

been removed. The value will continue to be read out until a new

signal is captured or the Test Set is reset by changing the setting of

the Code Function switch or the Range switch.

2.1.3 Rate

This function directly measures the rate of the signal. The result is

displayed on the CODE RATE scale. Only after two readings are

taken and found to be close together, does the Pointer deflect. It

may require up to eight seconds for the reading to be updated if the

rate changes. This reduces the possibility that noise may cause a

false rate indication. Also, the peak signal level must be at least

10% of full scale for the measurement to be made. The rate of the

highest level signal of either polarity is displayed.

2.1.4 On Time

This mode is similar to the Rate function, except the percentage of

time that the signal is on is displayed. The on time is read using the

"%" scale. Nominal Code Rate is 50% duty cycle.

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Page 10

2.2 The Cab Filter

If the Test Set has Cab Filters, then all AC functions may select one

frequency to be measured. This is invaluable when multiple cab

signals are being sent, as it negates the need to turn off one of the

cab signals to measure the other one. The Signal Select Switch is

simply placed in the position indicating the frequency to be mea-

sured. All functions behave the same, except that only the signal of

interest is measured.

2.3 Autopolarity

2.3.1 Auto-Polarity

For all DC functions, the Test Set works in the auto-polarity mode.

The highest level peak of either polarity and its timing parameters

will be measured. In this mode, the Pointer will always deflect up-

scale, with the NEG Indicator lighting for signals of negative polar-

ity. The highest level peak of either polarity and its timing param-

eters will be measured.

2.4 Power Supply Features

2.4.1 The Sleep Feature

Since the Test Set relies on batteries for operation, a battery saving

feature has been incorporated to extend the battery life if acciden-

tally left on. This is known as the Sleep mode. After approximately

five minutes of non-use (Pointer at less than 1% of scale and no

range switch changes) the Test Set will power down, reducing bat-

tery drain and extending battery life. This mode is indicated by the

Pointer deflecting down scale into the Sleep Zone. To reactivate the

Test Set, simply rotate the Range Switch. NOTE: DURING SLEEP,

THE TEST SET WILL NOT RESPOND TO ANY INPUT.

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