Simpson 270-5 Bedienungsanleitung

Simpson 270 Series 5

Volt-Ohm-Milliammeter

INSTRUCTION MANUAL

About this Manual

To the best of our knowledge and at the time written, the information contained in

this document is technically correct and the procedures accurate and adequate

to operate this instrument in compliance with its original advertised specifica-

tions.

Notes and Safety Information

This Operator’s Manual contains warning symbols which alert the user to check

for hazardous conditions. These appear throughout this manual where appli-

cable, and are defined below. To ensure the safety of operating performance of

this instrument, these instructions must be adhered to.

Warning, refer to accompanying documents.

Caution, risk of electric shock.

Technical Assistance

SIMPSON ELECTRIC COMPANY offers assistance Monday through Friday

8:00 am to 4:30 pm Central Time. To receive assistance contact Technical Sup-

port or Customer Service at (715) 588-3311.

Internet: http://www.simpsonelectric.com

Warranty and Returns

SIMPSON ELECTRIC COMPANY warrants each instrument and other articles

manufactured by it to be free from defects in material and workmanship under

normal use and service, its obligation under this warranty being limited to making

good at its factory or other article of equipment which shall within one (1) year

after delivery of such instrument or other article of equipment to the original

purchaser be returned intact to it, or to one of its authorized service centers, with

transportation charges prepaid, and which its examination shall disclose to its

satisfaction to have been thus defective; this warranty being expressly in lieu of

all other warranties expressed or implied and of all other obligations or liabilities

on its part, and SIMPSON ELECTRIC COMPANY neither assumes nor autho-

rizes any other persons to assume for it any other liability in connection with the

sales of its products.

This warranty shall not apply to any instrument or other article of equipment

which shall have been repaired or altered outside the SIMPSON ELECTRIC

COMPANY factory or authorized service centers, nor which has been subject to

misuse, negligence or accident, incorrect wiring by others, or installation or use

not in accord with instructions furnished by the manufacturer.

Contents

1. INTRODUCTION ............................................................................... 5

1.1 General Description ............................................................................. 5

1.2 Overload Protection ............................................................................. 5

1.3 Internal Batteries .................................................................................. 6

1.4 Printed Circuit ....................................................................................... 6

1.5 Phenolic Case ...................................................................................... 6

1.6 Adjust-A-Vue Handle ............................................................................ 6

1.7 Test Leads ............................................................................................ 6

1.8 Technical Data ...................................................................................... 6

1.9 Definition of Accuracy .........................................................................8

1.10 Safety Considerations ........................................................................ . 8

2. INSTALLATION ................................................................................ 9

2.1 Unpacking and Inspection ................................................................. 9

2.2 Warranty ............................................................................................. 9

2.3 Shipping ............................................................................................. 9

2.4 Power Source Requirements ............................................................. 9

3. CONTROLS, JACKS AND INDICATORS ......................................... 10

3.1 Front Panel Description ......................................................................10

4. OPERATION.................................................................................... 11

4.1 Safety Precautions .............................................................................11

4.2 Polarity Reversing ..............................................................................12

4.3 Measurement Of Unknown Voltage Or Current .................................13

4.4 Test Leads ..........................................................................................13

4.5 DC Voltage Measurement 0-250 Mv Range ......................................13

4.6 DC Voltage Measurement 0-1V Range .............................................13

4.7 DC Voltage Measurement 0-2.5 Through 0-500V Range. .................14

4.8 DC Voltage Measurement 0-1000v Range ........................................14

4.9 AC Voltage Measurement 0-2.5 Through 0-500V Range ..................15

4.10 AC Voltage Measurement 0-1000V Range .......................................16

4.11 Output Voltage Measurement .............................................................17

4.12 Decibel Measurement (-20 to +50 dB) ..............................................18

4.13 Direct Current Measurement ..............................................................19

4.14 Direct Current Measurement 0-50 μA Range ....................................19

4.15 Direct Current Measurement 0-1mA through 0-500mA Range .........19

4.16 Direct Current Measurement 0-10A Range .......................................20

4.17 Zero Ohms Adjustment .......................................................................21

4.18 Measuring Resistance .......................................................................21

4.19 Resistance Measurement of Semiconductors ...................................22

5. OPERATOR SERVICING ................................................................. 23

5.1 Inspection ...........................................................................................23

5.2 Battery Replacement ..........................................................................23

5.3 Fuse Replacement .............................................................................24

5.4 Test Lead Inspection ..........................................................................24

5.5 Care ....................................................................................................24

NOTES

1. INTRODUCTION

1.1 General Description

The Simpson Volt-Ohm-Milliammeter 270 Series 5 is a rugged, accurate, com-

pact and easy-to-use instrument that will make accurate measurements of AC

and DC voltage, direct current, resistance, decibels, and output voltage. The

output voltage function is used for measuring the AC component of a mixture of

AC and DC voltage. This occurs primarily in amplifier circuits.

New Features for the 270 are:

New connectors between the Instrument and the test leads, eliminating a

shock hazard if a connector is inadvertently pulled out of the Instrument jack.

An OFF/TRANSIT position, which is added to the function switch to protect

the meter movement during transit. (This position shunts the meter move-

ment and opens the internal connections to the COMMON and + jacks.)

A test lead set with molded elbow plugs at one end for connection to the front

panel input terminals and test probes at the other end. The test probes have

a non-slip grip surface and a barrier to maintain the spacing between the

user’s fingers and the probe tip. Threaded shoulders at the probe tip accept

screw-on alligator clips (supplied).

1.2 Overload Protection

No single protective device nor even a combination of devices as found in the

270 can fully protect a multipurpose instrument under all overload conditions.

Despite all the built-in-protection provided, however, severe overloads can dam-

age the Instrument when the Instrument is misused. The fuse/varistor combina-

tion in the 270 has been designed to afford maximum instrument protection un-

der foreseeable overload conditions which might occur within the measuring

capabilities of the Instrument. However, the operator must use care to avoid

severe overloads, particularly when working in high voltage circuits.

a. Fuses: Basic overload protection is provided by a small, inexpensive and

easily obtainable 3 AG type, 1 ampere, quick-blow fuse. This fuse is rated to

interrupt circuit voltages up to 250 volts. A supplemental high energy fuse is

provided for additional protection from severe overloads. This fuse is the

Bussman Type BBS 2A 600 V and has an interruption capacity of 10,000

amps AC. The Littlefuse Type BLS 2A 600 V with an interrupt capacity of

100,000 amps AC may also be used.

b. For maximum protection replace the 1A fuse with a Littlefuse Type 312001

only. This will allow the combination 1A and 2A fuse to give maximum protec-

tion to the unit and user under overload conditions which may occur within

the measuring capability of the VOM.

c. If the Instrument fails to indicate, the 1 Amp or the 2 Amp fuse may be burned

out. (Refer to paragraph 5.3 for fuse replacement.) A 1 Amp spare fuse is

furnished with each Instrument. Fuses are located in the battery and fuse

compartment.

NOTE: The 0-10A range is not fused. The shunt connects directly to the -10A and

+10A jacks.

d. Two diodes connected across the meter movement afford protection to the

movement by circumventing excessive current around the movement in the

event of an overload.

1.3 Internal Batteries

There are two batteries in the ohmmeter circuits, a NEDA 13F size D cell that

furnishes 1.5-volts for the R x 1 and R x 100 ranges and a NEDA 1604 battery that

furnishes 9-volts for the R x 10,000 range.

1.4 Printed Circuit

Most of the component parts are mounted on a printed circuit board which simpli-

fies assembly and maintenance, thus extending the useful life of the Instrument.

1.5 Phenolic Case

The Phenolic case is designed with heavy reinforced walls for maximum durabil-

ity and provides excellent protection for the circuit components. The case also

has an externally accessible battery and fuse compartment. Access to the batter-

ies and fuses is obtained by unscrewing a single captivated screw at the bottom

of the case and sliding out the compartment cover.

1.6 Adjust-A-Vue Handle

A carrying handle is attached to the Instrument case. The handle may be used to

support the Instrument in a convenient sloping position for easy viewing. The

case can also be placed either vertically or horizontally. The horizontal position is

preferable for greater accuracy since the Instrument is calibrated in this position.

1.7 Test Leads

Each Instrument is furnished with one pair (Catalog Number 00043) of probe

type test leads (one red and one black, each 48 inches long) for all applications

of the Instrument. These test leads have elbow prods on one end to connect the

leads to the recessed jacks on the Instrument front panel. The probe tips at the

opposite end have threaded shoulders to accept the screw-on insulated alligator

clips (furnished with the test leads). The test leads and the insulated alligator

clips are rated for the voltage and current ranges available on the 270. Maximum

ratings are 1000 V AC or DC or 10 DC amperes. These ratings for the test leads

must not be exceeded in any application.

1.8 Technical Data

Table 1-1. Technical Data

1. DC VOLTS:

Ranges: 0-1-2.5-10-50-250-500-1000V

Sensitivity: 20,000V per volt

2. DC MILLIVOLTS:

Range: 0-250mV

Sensitivity: 20,000V per volt

3. AC VOLTS:

Ranges: 0-2.5-10-50-250-500-1000V

Sensitivity: 5,000 per volt

4. OUTPUT VOLTAGE (AC):

Ranges: 0-2.5-10-50-250 (limited to 350 VDC)

5. DC MICROAMPERES:

Range: 0-50μA

Voltage Drop: 250 mV

6. DC MILLIAMPERES:

Ranges: 0-1-10-100-500 mA

Voltage Drop (Approx.): 250 mV, 255 mV, 300 mV, 500 mV

7. DC AMPERES:

Range: 0-10A

Voltage Drop (Approx.): 255 mV

NOTE: The 10A range is not internally fused.

9. *ACCURACY: F°78-°76F°77

DC Voltage Ranges: 1.25% of F.S. 1.75% of F.S.

DC Current

0-50μA Range: .S.Ffo%52.1.S.F%57.

Other Ranges: 1.25% of F.S. 1.75% of F.S.

**AC Voltage Ranges: 2% of .S.Ffo%3.S.F

Frequency Response: Referenced to 100 Hz (Figures 4-2 and 4-4)

Resistance Ranges:

crAfo°57.1crAfo%5.1:1xR

rAfo°52.1crAfo°1:001xR

crAfo°52.1crAfo°1:000,01xR

10. DECIBELS:

Ranges: -20 to +10 dB, -8 +22dB, +6 to +36 dB, +20 to

+50 dB

Reference Level: W/zero power level equal to 1 mW across

a 600 line.

11. BATTERIES: 1.5V, D Size, NEDA 13F 9V, NEDA 1604

12. FUSES: F1: 1A, 250V, type 3AG, quick-acting Littlefuse

Type 312001, F2: 2A, 600V (Bussman Type

BBS or Littlefuse Type BLS)

13. TEST LEADS: 1 red, 1 black, 48” long.

14. SIZE: 5-1/2” x 7” x 3 1/8” (13.34 x 17.78 x 7.94 cm)

15. WEIGHT: 3 lbs. (1.359 kg)

16. ***RATED CIRCUIT-TO

-GROUND VOLTAGE: 1000V AC/DC Max.

*Accuracies specified are for the 270 in a horizontal position.

ECNATSISE1RX0R01X0R00,01XR

:egna0R002-0 000,002-0 M02-0

:gnidaeRretne2C10021 000,021

tiucriCnepOlanimoN

egatloV

V5.1V5.1V9

tiucriCtrohSlanimoN

tnerruC

Am52A1m52.1Aμ57

**Responds to the average value of an AC current, and is calibrated to indicate

the RMS value of a pure sine wave.

***Per ANSI C39.5 April 1974: “The maximum voltage, with respect to Ground,

which may safely and continuously be applied to the circuit of an Instrument.”

1.9 Definition of Accuracy

The voltage and current accuracy of this Instrument is commonly expressed as a

percent of full scale. This should not be confused with accuracy of reading (indi-

cation). For example, +2% of full scale on the 10 volt range allows an error of

±0.20V at any point on the dial. This means that at full scale, the accuracy of

reading would be ±2%, but at half scale it would be ±4%. Therefore, it is advan-

tageous to select a range which gives an indication as near as possible to full

scale.

1.10 Safety Considerations

This Operator’s Manual contains special caution and warning symbols which

alert the user to hazardous operating and servicing conditions. These symbols

appear throughout this publication, where applicable, and are defined on the

inside front cover of this manual under NOTES AND SAFETY INFORMATION.

These instructions must be adhered to in order to ensure the safety of operating

and servicing personnel and to retain the operating conditions of the Instrument.

Table 1-2. Items and Accessories Furnished with this Instrument

Quantity Description Number

1 Test Lead Set, one red and one

black (48” long) each with combination

probe tip and removable rubber-sleeved

alligator clip. 00043

*1 1.5 volt, D cell, NEDA 13 F

*1 9.0 volt Cell, NEDA 1604

2 1 Amp, 250 V Fuse, Littlefuse Type #312001

1 2 Amp Fuse, 600 V (Bussman Type BBS or

Littlefuse Type BLS)

1 Operator’s Manual 6-111642

*Batteries are standard items replaceable from local retail stores.

Table 1-3. Additional Accessories

rebmuNgolataCnoitpircseD

54500pmalC-pmA2-051ledoM

2. INSTALLATION

This section contains information and instructions for the installation and ship-

ping of the Simpson 270-5. Included are unpacking and inspection procedures,

warranty, shipping and power source requirements.

2.1 Unpacking and Inspection

Examine the shipping carton for signs of damage. If damaged, notify the carrier

and supplier and do not attempt to use the Instrument.

If Instrument appears to be in good condition, read Operator’s Manual in its en-

tirety.

Become familiar with the Instrument as instructed in the manual, then check the

electrical performance as soon as possible. Check that all items are included

with the Instrument (Table 1-2).

After unpacking the Instrument, a 1.5V battery and a 9V battery may be found in

separate envelopes in the box with the Instrument and test leads. Two alligator

clips for the test leads are in a polyethylene bag. (See Section 5 for instructions

on how to open the battery compartment and install the batteries.)

2.2 Warranty

The Simpson Electric Company warranty policy is printed on the inside front

cover of this manual. Read the warranty policy carefully before requesting any

warranty repairs. For all assistance, including help with the Instrument under

warranty, contact the nearest Authorized Service Center for instructions. If nec-

essary, contact the factory directly and give full details of any difficulty and in-

clude the Instrument model number, series number, and date of purchase. Ser-

vice data or shipping instructions will be mailed promptly. If an estimate of charges

for non-warranty or other service work is required, a maximum charge estimate

will be quoted. This charge will not be exceeded without prior approval.

2.3 Shipping

Pack the Instrument carefully and ship it prepaid and insured.

2.4 Power Source Requirements

There are two batteries in the ohmmeter circuits, a NEDA 13F D size cell that

furnishes 1.5 volts for the R x 1 and R x 100 ranges and a NEDA 1604 battery that

furnishes 9 volts for the R x 10,000 range.

3. CONTROLS, JACKS AND INDICATORS

All operating and adjustment controls, jacks and indicators for the Simpson 270-

5 are described in this section. Become familiar with each item before operating

the Instrument.

3.1 Front Panel Description

The front panel controls, jacks and indicators are described in Table 3-1 and illus-

trated in Figure 3-1.

Table 3-1. Controls, Jacks and Indicators

1. Front Panel: The 270-5 Volt-Ohm-Milliammeter is a large, easy-to-

read 4-1/4” indicating Instrument. Switch positions

and circuit jacks are marked in white characters for

easy reading.

2. Range Switch: The range switch may be rotated in either direction to

select the desired voltage, current, or resistance range

position.

3. Function Switch: The function switch has four positions: Off/Transit, +DC,

-DC and AC. To measure DC current or voltage, set

the function switch at the -DC or +DC position, de-

pending on polarity of the signal applied across test

leads. To measure AC voltage set the function switch

to the AC position. For resistance measurement, the

switch may be set in either the +DC or -DC position.

The polarity of the internal ohmmeter battery voltage

at the (+) positive jack is identical to the function switch

polarity setting and opposite at the (-) common jack.

COMMON

ALL TERMINALS IKV. MAX

270

2.5V.

1V.

10V.

50V.

AMPS

250V.

500V.

1000V

A.C.

1000V.

A.C. D.C.

WARNING

READ MANUAL BEFORE USE

Figure 3-1. Controls, Indicators and Connector

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