Simpson Electric Company 12398, 12397 User manual

Simpson 260® Series 9S & 9SP

Volt-Ohm-Milliammeter

INSTRUCTION MANUAL

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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 specications.

Notes and Safety Information

This Operator’s Manual contains warning headings which alert the user to check for hazardous conditions.
These appear throughout this manual where applicable, and are dened below. To ensure the safety of operating
performance of this instrument, these instructions must be adhered to. This product has been designed to meet
UL 61010-1 requirements at 600V, Category III.

!

Warning, refer to accompanying documents.

Caution, risk of electric shock.

This instrument is designed to prevent accidental shock to the operator when properly used. However, no en­gineering design can render safe an instrument which is used carelessly. Therefore, this manual must be read
carefully and completely before making any measurements. Failure to follow directions can result in serious or
fatal accident.

Shock Hazard: As dened in American National Standard, C39.5, Safety Requirements for Electrical and Elec­tronic Measuring and Controlling Instrumentation, a shock hazard shall be considered to exist at any part in­volving a potential in excess of 30 volts RMS (sine wave) or 42.4 volts DC or peak and where a leakage current
from that part to ground exceeds 0.5 milliampere, when measured with an appropriate measuring instrument
dened in Section 11.6.1 of ANSI C 39.5.

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 authorizes 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.

260® is a Registered Trademark of the Simpson Electric Company.

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Contents

1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.1 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.2 Overload Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.1 Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Internal Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Overload Circuit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.5 Printed Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.6 Adjust-A-Vue Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

1.9 Denition Of Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.10 Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.11 Audio Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1.12 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.13 Additional Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.13.1 Amp-Clamp Model 150-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2. INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

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

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

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

2.5 Operating Position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3. OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.2 Operational Items and Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.3 Polarity Reversing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.4 Measurement of Unknown Voltage or Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.5 Test Leads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.6 DC Voltage Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.6.1 DC Voltage Measurement 0-250 mV Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.6.2 DC Voltage Measurement 0-2.5 Through 0-100V Range. . . . . . . . . . . . . . . . . . . . . . . . . 13

3.6.3 DC Voltage Measurement 0-250V Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6.4 DC Voltage Measurement 0-600V Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3.7 AC Voltage Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

3.7.1 AC Voltage Measurement 0-2.5 Thru 0-100V Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

3.7.2 AC Voltage Measurement 0-250V Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

3.7.3 AC Voltage Measurement 0-600V Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

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

3.9 Direct Current Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.9.1 Direct Current Measurement 0-1mA through 600mA Range. . . . . . . . . . . . . . . . . . . .19

3.9.2 Direct Current Measurement 0-10A Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.9.3 Alternating Current Measurement 0-10A Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.10 Zero Ohms Adjustmens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.11 Measuring Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.12 Resistance Measurement of Semiconductors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

3.13 Continuity Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

4. OPERATING SERVICING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.1 Removing the Instrument Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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Contents Continued

4.2 Battery and Fuse Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

4.3 Fuse Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

4.5 Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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1. INTRODUCTION

1.1 General Description

The Simpson Volt-Ohm-Milliammeter 260 Series 9, (hereafter referred to as the 260 or the Instrument) is a rug­ged, accurate, compact, easy-to-use instrument equipped with mirrored dial to eliminate parallax. The Instru­ment can be used to make accurate measurements of AC and DC voltage, direct current, resistance, and deci­bels. New Features in the 260-9 are:
t"NQ"$NFBTVSFNFOU
t%$CMPDLFE"$JOQVU
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t)JHI*NQBDU$BTF#MBDL

1.2 Overload Protection (9SP Version)

All the ranges, with exception of 10 Amp and 600 volt are protected by an electronic overload protection sys­tem. The protection is from the usual overloads that would damage the VOM. A transistorized circuit senses
the voltage drop across the indicating instrument and actuates a relay when the voltage reaches approximately
3 to 4 times rated full scale voltage. Sensing of the voltage drop is by means of a bridge network so that over­load protection is provided regardless of polarity. The relay operates at a uniform percent of overload since the
indicating instrument circuit is common to all ranges. When actuated by an overload, the relay contacts, which
are in the -COMMON CIRCUIT, latch open until the reset button on the front panel is depressed.

Due to its sensitivity to overloads, the electronic overload protection relay incorporated in the 260 is susceptible
to electrostatic elds from high potentials or transients either in the circuit being measured or in nearby circuitry.

Do not assume the relay to be faulty if it trips out without apparent cause. It may be indicating a dangerous
condition such as excessive circuit-to-ground (oating) voltage being applied to the Instrument.

Avoid loading the Instrument or its test leads until certain that excessive circuit-to-ground voltage does not exist.

a. The safety circuit is designed to limit battery drain . When the overload protection is tripped, the relay

opens the battery circuit. When the reset button has been pressed so that the VOM is operational; the
protection circuit draws less than the shelf life drain of the battery.

b. Since the 9 V battery is used for both the R X 10,000 range and the protection circuit, the VOM is de-

signed to allow the protection circuit to function normally as long as the R X 10,000 range can be set to
zero and an Alkaline battery is used.

c. The 1 and 2 Amp fuses in the input circuit oer additional protection to the meter. Some overload con-

ditions may cause the fuses to burn out as well as open the overload protection relay .

d. When an overload of sucient magnitude is applied to the VOM, the reset button will “pop up” approx-

imately 3/16 inch above the surface of the panel. To reset the VOM for normal operation, rst remove
the overload and depress the button. If the overload remains connected to the Instrument, resetting the
overload protection reset button will not connect the VOM input circuit.

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1.2.1 Fuses (Both 9S & 9SP)

Basic overload protection is provided by a small inexpensive and easily obtainable 3 AG type, 1 Amp, quick­blow fuse. This fuse is rated to interrupt circuit voltages up to 250V. A supplemental high energy fuse is pro­vided for additional protection from severe overloads. This fuse is the Bussman Type BBS 2A 600V with an
interrupt capacity of 10,000 Amps AC. The Littlefuse Type BLS 2A 600V may also be used.

NOTE: If the 260 fails to indicate a reading, the 1 or 2 Amp fuse may be burned out. (Refer to paragraph 4.2
for fuse replacement.) Use only the specied fuse type. The 0-10 A range is not fused. The shunt connects
directly to the -10 A and +10 A jacks.

The relay, fuse and diodes will prevent serious damage to the Instrument in most cases of accidental overload.
However, no overload protection system is completely foolproof and misapplication on high voltage circuits can
damage the Instrument. Exercise care and caution to protect both the user and the Instrument.

1.3 Internal Batteries

Two batteries are in the ohmmeter circuits, a NEDA 13F “D” cell that furnishes 1.5 V for the R X 1 and R X
100 ranges and a NEDA 1604A Alkaline battery that furnishes 9 V for the R X 10,000 range. The 1.5 V “D”
cell is held in place with two spring clips which also serve as battery contacts. The polarity symbols for the “D”
cell are marked near the battery contacts. The 9 V battery is held in place with a spring clip, but contact is made
with a separate connector that is polarized. Always observe correct polarity when replacing the 1.5 V “D” cell.

The 9 V battery must be installed and tested before the Instrument is ready for use. The 9XP relies on the 9 V
battery for proper operation. Perform the overload test described in Paragraph 1.4 to ensure proper overload
circuit operation prior to using the Instrument.

1.4 Overload Circuit Test

a. Set the range switch to R X 10,000 position and the function switch to the -DC position.

b. Plug the black test lead into the -COMMON jack terminal and touch the other end of the test lead to the

+10 A input terminal. (The relay reset button should pop up, indicating that the overload circuit is in
working condition.)

c. Reset the overload relay button.

NOTE: No damage will occur to the Instrument as a result of this test.

1.5 Printed Circuit

Most of the component parts are mounted on a printed circuit board which simplies assembly and mainte­nance, thus extending the useful life of the Instrument.

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 in either a vertical or horizontal posi­tion. The horizontal position is preferable for greater accuracy since the Instrument is calibrated in this position.

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1.7 Test Leads

Each Instrument is furnished with one pair (Catalog Number 07546) of probe type test leads (one red and one
black, each 48 inches long) for all applications of the Instrument. These test leads have retractable banannas
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)
Maximum ratings are 600V AC or DC or 10 Amps AC or DC. 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: 0-2.5-10-25-60-100-250-600V
Sensitivity: 20,000 ohms per volt

2. DC MILLIVOLTS:
Range: 0-250mV
Sensitivity: 20,000 ohms per volt

3. AC VOLTS:
Ranges: 0-2.5-10-25-60-100-250-600V
Sensitivity: 5,000 ohms per volt

4. DC MILLIAMPERES:
Ranges: 0-1-10-100-600 mA
Voltage Drop (Approx.): 250 mV

NOTE: The 10A range is not internally fused.

5. DC AMPERES:
Range: 0-10A
Voltage Drop (Approx.): 250 mV

6. AC AMPERES:
Range: 0-10A
Voltage Drop (Approx.): 250 mV

7. RESISTANCE:
Range: RX1 ( 1ohm major steps), RX100 (100 ohm major steps), RX10,000

(10,000 ohm major steps)

8. *ACCURACY:
DC Voltage Ranges: 2% of Full Scale
DC Current: 2% of Full Scale
**AC Voltage Ranges: 3% of Full Scale
AC Current 3% of Full Scale
Frequency Response: Referenced to 100 Hz (Figures 3-2 and 3-3)
Resistance Ranges:
R X 1: 2.5° of Arc
R X 100: 2° of Arc
R X 10,000: 2° of Arc

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9. DECIBELS:
Range: -20 to +10 dB, -8 to +22 dB, 0 to 30 dB

13 to 43 dB

Reference Level: With zero dB power level equal to 1 mW across a 600 Ohm line.

10. BATTERIES:
Voltage: 1.5V, 9V
NEDA No.: 13F, 1604A

11. FUSE: F1 1A, 250V, type 3AG, quick-acting Littlefuse Type
312001, F2 2A, 600V Littlefuse Type BLS or 2A

600V, Bussman Type BBS.

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

13. SIZE: 5 1/4” x 7” x 3 1/8” (13.34 x 17.78 x 7.94 cm)

14. WEIGHT: 2 1/4 lbs (1.02 Kg)

15. ***RATED CIRCUIT-TO

-GROUND VOLTAGE: 600V AC/DC Max.

* Accuracies specied are for the 260 in a horizontal position.
** 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 specied voltage with respect to ground, which may be safely and

continuously applied to the circuit of an Instrument.”
**** Operating Temperature: 0°C to +50°C
Storage Temperature: -10°C to +60°C
Relative Humintiy: Maximum relative humidity 80% for temperature up to 31°C and decreasing lin-

early to 50% relative humidity at 50°C.
Ambient Temperature: 25°C

1.9 Denition 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 (indication). For example, +/-2% of full scale on the 10 volt
range allows an error of +/-200mV at any point on the dial. This means that at full scale, the accuracy reading
would be +/-2%, but at half scale it would be +/-4%. Therefore, it is advantageous to select a range which gives
an indication as near as possible to full scale.

1.10 Safety Considerations

This Operator’s Manual contains cautions and warnings alerting the user to hazardous operating and service
conditions. This information is agged by CAUTION or WARNING symbols throughout the publication,
where applicable, and is dened on the inside front cover under “Notes and Safety Information.” Adhere to
these instructions in order to ensure the safety of operating and servicing personnel and to retain the operating
conditions of the Instrument.

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1.11 Audio Alarm

The 260 Audio Alarm transducer will emit an audio sound when the continuity (ohms range) of a circuit being
tested is completed.

No Circuit Continuity Tests are to be made with electrical power “ON.” Turn “OFF” all electrical power.

1.12 Accessories

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

Quantity Description Number
1 Test Lead Set - one red and one black (48” long) 07546
each with combination probe tip and removable
rubber-sleeved alligator clip.

*1 1.5 Volt, D Cell, NEDA 13F

*1 9.0 Volt Cell, NEDA 1604A (Alkaline)

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

1 2A, 600V Fuse, Littlefuse Type BLS (or Bussman
Type BBS)
1 Padded polyester case (Safety Orange) 00838

1 Operator’s Manual 6-117867

*Batteries are standard items replaceable at local retail stores.

1.13 Additional Accessories

Table 1-3. Additional Accessories

Description Catalog Number

Case, Black padded polyester 00834

Model 150-2 Amp-Clamp 00541

1.13.1 Amp-Clamp Model 150-2

The Simpson Amp-Clamp Model 150-2 allows AC current measurements without breaking the circuit under
test. The Amp-Clamp works in eect as a transformer containing a split core for accommodating the conductor
which carries the current being measured. The current-carrying conductor becomes the transformer primary
and a coil in the Amp-Clamp serves as the secondary winding. The Amp-Clamp output voltage is proportional to
the current measured and can be applied to the 260-9 as an AC voltage.

The Amp-Clamp has a range selector with six positions. Any of the following current ranges can be used with
the 260-9: 5A AC, 10A AC, 25A AC, 50A AC, 100A AC or 250 A AC.

NOTE: Instructions are furnished with each Amp-Clamp.

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2. INSTALLATION

This section contains information and instructions for the installation and shipping of the Simpson 260-9X. In­cluded are unpacking and inspection procedures, warranty, shipping, power source requirements and operating
position.

2.1 Unpacking and Inspection

Examine the shipping carton for obvious signs of damage. If damage is noted, 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 entirety. Become familiar with the Instrument as instructed in the manual, then check the electrical
performance as soon as possible. Make sure 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 the test leads. Two alligator clips for the test leads are in a polyethylene bag. See Sec­tion 4, 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 it
carefully before requesting any warranty repairs. For LL assistance, contact the nearest Authorized Service
Center or the factory directly. Give full details of any installation diculties and include the Instrument model
number, series number, and date of purchase. Service 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, to the proper destination.

2.4 Power Source Requirements

There are two batteries in the ohmmeter circuits: One is a NEDA 13F D size cell that furnishes 1.5 volts for the
R X 1 and R X 100 ranges. A NEDA 1604A battery furnishes 9 volts for the R X 10,000 range. The 1.5 volt
D cell is held in place with two spring clips which also serve as battery contacts. The 9-volt battery is held in
place with a spring clip but contact is made with a separate connector that is polarized. (Always observe correct
polarity when replacing the 1.5-volt D cell.)

2.5 Operating Position

A handle is attached to the side of the Instrument case. The handle may be used to support the Instrument in a
convenient, sloping position for easy viewing. The VOM case can also be placed either in a vertical or horizon­tal position. The horizontal position is preferable for greater accuracy since the Instrument is calibrated in this
position.

3. OPERATION

This section of the manual contains information required to use and operate the 260-9 in a safe and proper manner.
Multifunction instruments (VOM’s) such as the 260-9 are intended as general purpose measuring Instruments
for use in low power circuitry such as found in consumer appliances, TV and radio receivers, and in general
laboratory applications. Their use is not recommended in high voltage, high power circuitry where operator er­rors and inadequate personal protective measures could result in serious injury from arcing or explosion. Such
circuitry is found in industrial or commercial applications such as induction (r-f) heaters and broadcast trans­mitters, power substations and distribution centers, x-ray equipment, large motor controls, etc. Working in the
high voltage section of such equipment requires single-function, often specially designed instruments operated
by specially trained personnel who use appropriate protective equipment and procedures.

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3.1 Safety Precautions

The following precautions are suggestions and reminders of commonly recognized safe practices as well as
specic hazards to be avoided, and are not implied to be sucient to ensure the safety of untrained personnel
in all circumstances. Neither is this manual a substitute for technical manuals covering the equipment being
measured. Always refer to the equipment manual and its specic warnings and instructions and observe them
as well as those contained herein.

a. The 260-9 should only be used by personnel qualied to recognize shock hazards and trained in the

safety precautions required to avoid possible injury.

b. Do not connect any terminal of this Instrument to a circuit point at which a voltage exceeding 600 volts

AC or DC may exist with respect to earth ground. (Refer to Table 1-1, item 16.)

c. Turn o power and discharge any capacitors in the circuit to be measured before connecting to or dis-

connecting from it.

d. Before using this Instrument, check accessories, if any, and test leads for missing, damaged, deteriorated

or otherwise faulty insulating parts. Do not use, or permit the use of, equipment with faulty insulation

until it has been properly repaired.

e. Always wear safety glasses when working in electrical circuitry.

f. Do not work alone on high voltage circuits. Make certain that someone capable of giving aid is watch-

ing nearby.

g. Do not handle the Instrument, its test leads, or the circuitry while high voltage is being applied.

h. Hands, shoes, oor, and workbench must be dry. Avoid making measurements under humid, damp, or

other environmental conditions that could eect the dielectric withstanding voltage of the test leads or

Instrument.

i. Do not change switch settings or test lead connections while the circuit is energized. A mistake could

damage the instrument and cause personal injury.

j. Locate all voltage sources and accessible current paths before making connections to circuitry.

k. Make certain that the equipment being worked upon is properly grounded and fuses are of the proper

type and rating.

l. Double check switch positions and jack connections before applying power to the Instrument.

m. Remain alert for low voltage circuits which may be oating at high voltage with respect to earth ground

and for composite voltages (AC + DC) such as are found in r-f ampliers. The oating voltage or com-

posite voltage must not exceed the Instrument’s rated maximum circuit-to-ground voltage.

n. Do not make electrical measurements where the air may contain explosive concentrations of gas or dust

such as in mines, grain elevators, gasoline stations or in the presence of charging batteries until deter-

mined to be safe by qualied personnel. Note that even metallic dusts can be explosive.

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o. No General Purpose VOM is to be used to make electrical measurements on blasting circuits or blasting

caps.

3.2 Operational Items and Features

Table 3-1 describes the function of all the items used to operate the Instrument. These items are illustrated in
Figure 3-1. Become familiar with these items prior to operating the Instrument for the rst time.

Table 3-1. Operating Items and Features

1. Range Switch: Twelve positions: May be rotated 360° in either direction to select any of the ve AC &

DC voltages, four DC currents & three resistance ranges.

2. Function Switch: The function switch has four positions: (Audio), +DC, -DC, and AC . To measure DC

current or voltage, set function switch to the -DC or +DC position, depending on polarity of the signal

applied across the test leads. To measure AC set the function switch to the AC position. For resistance

measurement, switch may be set in either the +DC, -DC or (Audio) position . Polarity of the internal

ohm meter battery voltage will be as marked at the jacks when switch is in the +DC position and re-

versed in the -DC position.

3. Zero Ohms: This control is used to compensate for variation in the voltage of the internal batteries when

making resistance measurements.

4. Circuit Jacks: There are Six jacks on the front panel marked with the functions they represent. These

jacks provide the electrical connections to the test leads. The COMMON (-) jack is used (in conjunction

with the black test lead) as the reference point for the measurement of all the functions with the excep-

tion of the 10A range.

5. Point Adjust For Zero: With the Volt-Ohm-Milliammeter in an operating position, check that the pointer

indicates zero at the left end of the scale when there is no input. If pointer is o zero, adjust the screw

located in the cover below the center of the dial. Use a small screwdriver to turn the screw slowly clock-

wise or counterclockwise until the pointer is exactly over the zero mark at the left end of the scale. With

the indicating pointer set on the zero mark, reverse the direction of rotation of the zero adjuster slightly

to introduce mechanical freedom or “play”, but insucient to disturb the position of the indicating

pointer. This procedure will avoid disturbances to the zero setting by subsequent changes in tempera-

ture, humidity, vibration, and other environmental conditions.

6. Reset Button: This white button is the overload protection circuit breaker. Resetting this button will
(XP only) restore meter to full operation, provided overload condition has been removed.

3.3 Polarity Reversing

The function switch provides a convenient means to reverse polarity of the internal battery to facilitate test­ing semiconductor devices. The +DC and -DC positions transpose internal connections to the COMMON and
+jacks and therefore can also be used to reverse polarity of external voltages and currents connected to these
jacks (only). Because polarity reversing momentarily interrupts the circuit, it should not be done while measur­ing current or voltage without rst turning o the circuit power. When making measurements on the 250mV,
or 10 Amp range, polarity can be corrected only by reversing the test leads.

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3.4 Measurement of Unknown Voltage or Current

Sometimes the approximate voltage or current to be measured is known and the correct range may easily be
selected. Often, however, particularly when working on faulty equipment, the voltage or current is either un­known or may be much higher than normal and anticipated. When working upon unfamiliar or unknown equip­ment, always begin a measurement using the highest range available on the Instrument. Once it is determined
that the voltage is within the limits of a lower range, change to the lower range.

Figure 3.1

3.5 Test Leads

These are provided with accessory screw-on alligator clips which may be attached to the probe tips. As well as
eliminating the need to hand-hold test prods to a circuit for extended periods, the test clips provide a means of
reducing hand proximity to a high voltage circuit while energized. Circuit power must be turned o and any
charged capacitors discharged before connecting or disconnecting clips to or from the current.

3.6 DC Voltage Measurement

Before making voltage measurements, review the SAFETY PRECAUTIONS listed in paragraph 3.1. Also,
when using the 260 as a millivoltmeter, care must be taken to prevent damage to the indicating instrument from
excessive voltage.

3.6.1 DC Voltage Measurement 0-250 mV Range

Before using the 250 millivolt range, use the 2.5V DC range to determine that the voltage measured is not
greater than 250 mV (or .25 V DC).

a. Set the function switch at +DC.

b. Plug the black test lead in the -COMMON jack and the red test lead into the +10 A / 250mV jack.

c. Set the range switch at 2.5V common position with 250mV.

d. Connect the black test lead to the negative side of the circuit being measured and the red test lead to the

positive side of the circuit.

e. Read the voltage on the black scale marked DC and use the gures marked 0-25. Multiply by 10 to read

in millivolts.

NOTE: For polarity reversing see paragraph 3.4.

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3.6.2 DC Voltage Measurement 0-2.5 Through 0-100V Range

a. Set the function switch at +DC.

b. Plug the black test lead into the -COMMON jack and the red test lead into the +jack.

c. Set the range switch at one of the ve voltage range positions marked 2.5V, 10V, 25V, 60V or 100V.

NOTE: When in doubt as to the voltage present, always use the highest voltage range as a protection to the
Instrument. If the voltage is within a lower range, the switch may be set for the lower range to obtain a more
accurate reading. Be sure power is o in the circuit being measured and all capacitors discharged.

d. Connect the black test lead to the negative side of the circuit being measured and the red test lead to the

positive side of the circuit.

e. Turn on the power in the circuit being measured.

f. Read the voltage on the black scale marked DC. For the 2.5V range, use the 0-25 gures and multiply

by 0.1, for the 10V, 25, and 60V ranges, read the gures directly. For the 100V range, use the 0-10

gures and multiply by 10.

NOTE: Turn o power to the circuit and wait until the meter indicates zero before disconnecting the test leads.

3.6.3 DC Voltage Measurement 0-250V Range

Use extreme care when working with high voltage circuits. Do not touch the Instrument or test leads while
power is on in the circuit being measured.

Before proceeding with the following steps, review the Safety Precautions in Paragraph 3.1.

a. Set the function switch at +DC.

b. Set the range switch at the 100V/250V/600V position.

c. Plug the black test lead into the -COMMON jack and the red test lead into the 250V jack.

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d. Make sure power is o in the circuit being measured and all capacitors discharged. Connect the black

test lead to the negative side of the circuit being measured and the red test lead to the positive side of the

circuit.

e. Turn on power in circuit being measured.

f. Read the voltage on the black scale marked DC. Use the 0-25 gures and multiply by 10.

NOTE: Turn o power to the circuit and wait until the meter indicates zero before disconnecting the test leads.

Figure 3.2

3.6.4 DC Voltage Measurement 0-600V Range

Use extreme care when working with high voltage circuits. Do not touch the Instrument or test leads while

power is on in the circuit being measured.

Before proceeding with the following steps, review the Safety Precautions in Paragraph 3.1.

Figure 3.3

a. Set the function switch at +DC.

b. Set the range switch at the 100/250V/600V position.

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c. Plug the black test lead into the -COMMON jack and the red test lead into the 600V jack.

d. Make sure power is o in the circuit being measured and all capacitors are discharged. Connect the

black test lead to the negative side of the circuit being measured and the red test lead to the positive side

of the circuit.

e. Turn on power in circuit being measured.

f. Read the voltage using the 0-60 gures on the black scale marked DC. Multiply the reading by 10.

NOTE: Turn o power to the circuit and wait until the meter indicates zero before disconnecting the test leads.

3.7 AC Voltage Measurement

Branch and distribution circuits (120/240/480V etc.) can deliver dangerous explosive power momentarily into a
short circuit before the fuse/breaker opens the circuit. Make certain that the Instrument switches are set prop­erly, jacks are connected properly, and that the circuit power is turned o before making connections to such
circuits.

The 260 responds to the average value of an AC waveform. It is calibrated in terms of the RMS value of a pure
sine wave. If the waveform is nonsinusoidal, depending on its waveform, the reading may be either higher or
lower than the true RMS value of the measured voltage. An error may be introduced if the 260 is used to mea­sure a nonsinusoidal waveform. Also, accuracy is lessened at higher input frequencies (Figure 3-2).

3.7.1 AC Voltage Measurement 0-2.5 Thru 0-100V Range

Before proceeding with the following steps, review the Safety Precautions in Paragraph 3.1.

Figure 3.4

a. Set the function switch to AC position.

NOTE: The meter may not indicate if the switch is incorrectly set to a DC position.

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b. Set the range switch at one of the ve voltage range positions marked 2.5V, 10V, 25V, 60V or 100V.

(When in doubt as to actual voltage present, always use the highest voltage range as a protection to the

Instrument. If the voltage is within a lower range, the switch may be set for the lower range to obtain a

more accurate reading.)

c. Plug the black test lead into the –COMMON jack and the red test lead into the +jack.

d. Turn o power to the circuit to be measured and discharge any capacitors.

e. Connect the test leads across the circuit voltage to be measured with the black lead to the grounded side.

(nearest earth ground)

f. For the 2.5V range, read the value directly on the scale marked 2.5VAC. For the 10V, and 25V ranges,

read the red scale marked AC and use the black gure immediately above the scale. For the 100V range,

read the red scale and use the black gure immediately above the scale. Multiply reading by 10. r the

600V range, read the value directly on the red scale marked 600V.

3.7.2 AC Voltage Measurement 0-250V Range

Do not attempt any voltage measurement which may exceed 600 volts or the circuit-to-ground voltage of the
Instrument, 600 volts maximum.

Be sure that the range switch is set to the 100V/250V/600V range, function switch to AC volts only position,
and test leads connected to common and 250V jack.

Do not touch the Instrument or test leads while the power is on the circuit being measured.

Use extreme care when working in high voltage circuits. Do not handle the Instrument or test leads while the
circuit being measured is energized. OBSERVE ALL SAFETY PRECAUTIONS in paragraph 3.1 and in the
instruction manual for the equipment being tested.

Figure 3.5

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a. Set the function switch to AC volts only position.

NOTE: The meter will not indicate if the switch is incorrectly set to a DC position.

b. Set the range switch at 100V250V/600V position.

c. Plug the black test lead into the -COMMON jack and the red test lead in the 250V jack.

d. Be sure the power is o in the circuit being measured and that all its capacitors have been discharged.

e. Connect the test leads across the circuit voltage to be measured with the black lead to the grounded side.

f. Turn on the power in the circuit being measured.

g. For the 250V range, read the red scale and use the black gure immediately above the scale. Multiply

reading by 10.

3.7.3 AC Voltage Measurement 0-600V Range

Use extreme care when working in high voltage circuits. Do not handle the Instrument or test leads while the
circuit being measured is energized. OBSERVE ALL SAFETY PRECAUTIONS in paragraph 3.1 and in the
instruction manual for the equipment being tested. Do not attempt any voltage measurement which may exceed
600V or the circuit-to-ground voltage of the instrument, 600V maximum.

Do not attempt any voltage measurement which may exceed 600V or the circuit-to-ground voltage of the Instru­ment, 600V maximum.

Make certain that the range switch is set to the 100V/250V/600V range, function switch to AC volts only posi­tion, and test leads connected to COMMON and 600V jack.

Do not touch the Instrument or test leads while the power is on in the circuit being measured.

Figure 3.6

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a. Set the function switch at AC.

NOTE: The meter will not indicate if the switch is incorrectly set to a DC position.

b. Set the range switch at 100V/250V/600V position.

c. Plug the black test lead into the -COMMON jack and the red test lead in the 600V jack.

d. Make sure the power is o in the circuit being measured and that all its capacitors have been discharged.

e. Connect the test leads across the circuit voltage to be measured with the black lead to the grounded side.

f. Turn on the power in the circuit being measured.

g. Read the voltage on the red scale marked AC. Use the 0-600 gures.

3. Decibel Measurement (-20 to +50 dB)

Certain industries measure in terms of voltage or current ratios (decibels) based on a specic reference level.
The dB scale on the 260-9 serves this purpose and is calibrated to a reference level (zero dB) of 0.001 watt into
600 ohms. The scale calibration of -20 to +10 dB is for the 0-2.5V range (zero dB = 0.775V). Higher ranges
may be used by adding an appropriate dB value to the reading in accordance with the chart below.

Scale DB Correction

2.5
10
25

60

100

+0

+12
+20

+27
+32

a. Review the safety precautions in paragraph 3.1.

b. Use operating instructions for AC VOLTAGE MEASUREMENT, 0-2.5/10/25/60/100V RANGES

(paragraph 3.8).

c. Read decibels on the bottom scale marked dB. For the 10/25/60/100V ranges, add the appropriate factor

from the following chart.

NOTE: The maximum voltage ratio that can be measured is +50 dB on the 0-250V range.

d. If dB measurements are being made to a 0.006 watt into 250V reference level, subtract +7 dB from the

reading obtained on the 260.

3.9 Direct Current Measurement

Do not change the range setting of the range or function switches while the circuit is energized.

Never disconnect test leads from the circuit under measurement while it is energized.

Always turn the power o and discharge all the capacitors before changing switch settings or disconnecting
leads.

Never exceed the circuit-to-ground voltage of the instrument (600 V max., Table 1-1, item 16).

Always connect the instrument in series with the ground side of the circuit.

In all direct current measurements, make certain that the power to the circuit being tested has been turned o
before connecting and disconnecting test leads or restoring circuit continuity.

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3.9.1 Direct Current Measurement 0-1mA Through 0-600mA Range

a. Set the function switch at +DC.

b. Plug the black test lead into the -COMMON jack and the red test lead into the +jack.

c. Set the range switch at one of the four range positions marked 1 mA, 10 mA, 100 mA or 600 mA.

d. Open the grounded side of the circuit in which the current is being measured. Connect the VOM in se-

ries with the circuit. Connect the red test lead to the positive side and the black test lead to the negative
side.

e. Turn the power on. Read the current in milliamperes on the black DC scale. For the 1 mA range, use

the 0-10 gures and divide by 10. For the 10 mA range, use the 0-10 gures directly. For the 100 mA
range, use the 0-10 gures and multiply by 10. For the 500 mA range, use the 0-60 gures and multiply
by 10.

f. Turn the power o and disconnect the test leads.

This range is only intended for measurements in low voltage circuits (under 25 V DC) such as the primary
power in vehicles or their accessories.

3.9.2 Direct Current Measurement 0-10A Range

a. Plug the black test lead into the -10A jack and the red test lead into the +10A jack.

Figure 3.7

b. Set the function switch at +DC

c. Set the range switch at 10 AMPS (dual position with 10mA).

d. Open the ground side of the circuit in which the current is being measured. Connect the VOM in series

with the circuit, connecting the red test lead to the positive side and the black test lead to the negative
side.

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NOTE: The function switch has no eect on polarity for the 10 AMPS DC range.

e. Turn the power on. Read the current directly on the black DC scale. Use the 0-10 gures to read di-

rectly in amperes.

f. Turn the power o and disconnect the test leads.

3.9.3 Alternating Current Measurement 0-10A Range

Figure 3.8

a. Plug the black test lead into the -10A jack and the red test lead into the +10A jack.

b. Set the function switch at AC

c. Set the range switch at 10 AMPS AC(dual position with 10Volt).

d. Open the ground side of the circuit in which the current is being measured. Connect the VOM in series

with the circuit, connecting the red test lead to the positive side and the black test lead to the negative
side.

.elacs eht evoba yletaidemmi erugif kcalb eht esu dna CA dekram elacs der eht daeR .no rewop eht nruT .e

Use the 0-10 gures to read directly in amperes.

f.

Turn the power o and disconnect the test leads.

!

The 10A range is not internally fused in the 260. When using the 10A range, never disconnect a test lead from a
jack or from the circuit while the circuit is energized. Doing so may damage the test jacks or leads and the arc­ing may be hazardous to the operator. Turn o circuit power and wait for the meter reading to drop to zero.

The polarity reversing feature of the function switch does not operate on the 0-10A range. If polarity is found
to be incorrect, turn o circuit power, wait for the meter indication to read zero and then interchange test lead
connections to the circuit.

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3.10 Zero Ohms Adjustment

When resistance is measured, the INTERNAL batteries B1 and B2 furnish power for the circuit. Since batteries
are subject to variation in voltage and internal resistance, the Instrument must be adjusted to zero before mea­suring a resistance, as follows:

a. Turn range switch to desired ohms range.

b. Plug the black test lead into the -COMMON jack and the red test lead into the +jack.

c. Connect the ends of test leads together to short the VOM resistance circuit.

d. Rotate the ZERO OHMS control until pointer indicates zero ohms. If pointer cannot be adjusted to zero,

one or both of the batteries must be replaced. (For battery replacement, refer to Section 4.)

e. Disconnect shorted test leads.

Figure 3.9

3.11 Measuring Resistance

Voltage applied to a resistance range will cause reading errors if low and damage the Instrument if high. When
making in-circuit measurements, make certain that the circuit is completely de-energized before making con­nections to it.

When making in-circuit measurements, circuit paths in parallel with the resistance being measured may cause
reading errors. Check circuit diagrams for the presence of such components before assuming that the reading
obtained is correct.

a. Before measuring resistance in a circuit, make sure the power is o to the circuit being tested and all

capacitors are discharged. Disconnect shunting components from the circuit before measuring its resis­tance.

b. Set the range switch to one of the resistance range positions as follows:

1. Use R X 1 for resistance readings from 0 to 200 ohm.

2. Use R X 100 for resistance readings from 200 to 20,000 ohm.

3. Use R X 10,000 for resistance readings above 20,000 ohm.
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c. Set the function switch at either -DC or +DC position. The results are the
same in either position unless there are semiconductors in the circuit ((see paragraph 3.14). Adjust

ZERO OHMS control for each resistance range.

d. Observe the reading on the OHMS scale at the top of the dial.

NOTE: The OHMS scale reads from right to left for increasing values of resistance.

e. To determine the resistance value, multiply the reading by the factor at the switch position. (The ‘K’ on

the OHMS scale equals one thousand.)

3.12 Resistance Measurement of Semiconductors

Make sure that the OHMS range being used will not damage any of the semiconductors (refer to Table 1-1,
item 8, Section I).

If there is a “forward” and “backward” resistance such as in diodes, the resistance should be relatively low in
one direction (for forward polarity) and higher in the opposite direction.

Rotate the function switch between the two DC positions to reverse polarity. This will determine if there is a
dierence between the resistance in the two directions. To check a semiconductor in or out of a circuit (forward
and reverse bias resistance measurements) consider the following before making the measurement:

a. The polarity of the battery voltage will be as marked at the jacks when the switch is in the +DC position

and reversed in the -DC position.

b. Ensure that the range selected will not damage the semiconductor. (Refer to Table 1-1, item 8 and re-

view the specication limits of the semiconductor according to the manufacturer’s ratings.)

c. If the semiconductor is a silicon diode or conventional silicon transistor, no precautions are normally

required.

d. If the semiconductor material is germanium, check the ratings of the device and refer to Table 1-1, item

8, Section 1.

NOTE: The resistance of diodes will measure dierently from one resistance range to another on the VOM
with the function switch in a given position. For example, a diode which measures 80 ohms on the R X 1 range
may measure 300 ohms on the R X 100 range. The dierence in values is a result of the diode characteristics
and is not indicative of any fault in the VOM.

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3.13 Continuity Tests

Turn o all power to the circuit being tested before proceeding any further.

a. Set the FUNCTION switch to the F| (note) And the RANGE t o any ohms . Insert the black test lead into

the COMMON (-) and the red test lead into the (+) jack.

b. Touch the test lead probe tips together. An audio sound should be heard.

c. To test for continuity, probe the circuit or component in question. An audible sounEJOEJDBUFTDPOUJOVJUZ

The higher the circuit’s resistance, the lower the sound level. The lower the circuit’s resistance, the higher the
sound level.

4. OPERATING SERVICING

This Instrument has been carefully designed and constructed with high-quality components. By providing
reasonable care and following the instructions in this manual, the user can expect a long service life from these
instruments.

Before opening the battery compartment cover, disconnect the test leads from live circuits.

4.1 Removing the Instrument Case

To gain access to the inside of the Instrument panel, disconnect the test leads and remove the cover from the
battery compartment. Next, remove the four case-fastening screws and lift the case from the panel.

When replacing the case, make certain that the wires leading to the battery compartment are seated in their re­spective slots within the compartment wall. This will prevent damage to the wire insulation.

4.2 Battery and Fuse Replacement

The batteries and 1 Amp fuse are located inside an isolated compartment at the top-rear of the Instrument case.
To open the battery and fuse compartment:

a. Place the Instrument face down on a soft padded surface.

b. Unscrew the single screw on the cover.

c. Remove the cover from the case and set aside. Batteries and fuse may now be replaced.

NOTE: If replacement of the 2 Amp high current interrupting fuse is necessary, the Instrument case must be
removed.

Typically if the high energy fuse is blown, there will be other internal damage. It is recommended that this type
of repair be performed by a qualied repair center only.

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If the pointer cannot be adjusted to zero ohms or the R X 1 or R X 100 range, replace the 1.5 V battery. If the
pointer cannot be adjusted to zero on the R X 10,000 range replace the 9 V battery.

a. To replace the “D” size battery:

1. Remove the old 1.5 V battery.

2. Insert the (-) end of battery rst, pushing against the (-) terminal spring clip, then gently push the (+)

side of the battery into place.

b. To replace the 9 V battery:

1. Remove the battery with the mating connector from the compartment.

2. Take the connector o the old battery and connect it to the new battery.

3. Insert new battery into the compartment.

4. Place the connector leads so they rest between the cavity walls and clear the fuse terminals. The extend-

ed leads are placed between the battery holder and the top wall of the case.

NOTE: 1 Amp and/ or 2 Amp fuse replacement is necessary when there is no meter deection on any of the
DC, AC Volts or Ohms ranges but the DC Amps range operates properly.

c. To replace the 1 Amp fuse:

1. Pull defective fuse from its retaining spring clips.

2. Snap-in the replacement fuse and replace the cover.

NOTE: A spare fuse is located in a cavity next to the fuse clip.

4.3 Fuse Protection

A 1 Amp 250V quick-acting fuse and a 2A high voltage, high interruption capacity fuse are connected in a
series with the input circuit as additional protection to the VOM against excessive energy fault current, such as
a power line overload.

It is important to replace the 1 Amp fuse with a Littlefuse Type 312001 only to prevent the 2 Amp high inter­ruption capacity fuse from opening on nominally high overload.

If the Instrument fails to indicate, the 1 Amp or the 2 Amp fuses may be burned out. (Refer to paragraph 4.2
for fuse replacement.) A 1 Amp spare fuse is furnished with each Instrument. (Both 1 Amp fuses are located in
the battery and fuse compartment.) The 2 Amp fuse is located on the Instrument panel under the printed circuit
board.

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4.5 Care

a. Do not attempt to clean this Instrument with the test leads connected to a power source.

b. Immediately clean all spilled materials from the Instrument and wipe dry. If the spillage is corrosive,

use a suitable cleaner to neutralize the corrosive action.

c. Do not allow the battery to fully discharge. When the batteries reach the end of their useful life, they

should be promptly replaced. Failure to do so may result in corrosion at the battery contacts due to bat­tery leakage.

d. Avoid prolonged exposure or usage in areas which are subject to temperature and humidity extremes,

vibration or mechanical shock, dust or corrosive fumes, or strong electrical or electromagnetic interfer­ences.

e. Verify Instrument accuracy by performing operational checks using known, accurate, stable sources. If

proper calibration equipment is not available, contact the nearest Authorized Service Center.

f. It is recommended that the Instrument be returned annually to the nearest Authorized Service Center, or

to the factory, for an overall check, adjustment, and calibration.

g. When not in use, store Instrument in a room free from temperature extremes, dust, corrosive fumes, and

mechanical vibration or shock.

If Instrument is stored more than thirty days, remove batteries.

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Notes

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Printed in U.S.A. Part No. 06-117867 Edition 3, 05/11

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