Simpson Electric 260 Series 8P Instruction Manual
Simpson 260® Series 8P
Volt-Ohm-Milliammeters
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 specifications.
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 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.
!
This instrument is designed to prevent accidental shock to the operator when
properly used. However, no engineering design can render safe an instrument
whick 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 defined 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 defined in Section 11.6.1 of
ANSI C 39.5.
Technical Assistance
SIMPSON ELECTRIC COMPANY offers assistance Monday through Friday
7:30 am to 5:00 pm Central Time by contacting Technical Support or
Customer Service at (847) 697-2260.
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 def ectiv e; 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.
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NOTES:
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Contents
1. INTRODUCTION ............................................................................... 6
1.1 General Description ........................................................................... 6
1.2 Overload Protection ............................................................................ 6
1.3 Internal Batteries ................................................................................ 7
1.4 Overload Circuit Test ..........................................................................7
1.5 Printed Circuit ..................................................................................... 8
1.6 Phenolic Case .................................................................................... 8
1.7 Adjust-A-Vue Handle .......................................................................... 8
1.8 Test Leads ..........................................................................................8
1.9 Technical Data .................................................................................... 8
1.10 Definition of Accuracy....................................................................... 1 0
1.11 Safety Considerations ...................................................................... 10
1.12 Audio Alarm ...................................................................................... 10
1.13 Accessory AC High Voltage Probe ................................................... 1 1
1.14 Amp-Clamp Model 150-2 ................................................................. 11
2. INSTALLATION ................................................................................ 11
2.1 Unpacking and Inspection ............................................................... 11
2.2 Warranty ...........................................................................................11
2.3 Shipping ...........................................................................................12
2.4 Power Source Requirements ........................................................... 12
2.5 Operating Position ............................................................................ 1 2
3. CONTR OLS, JA CKS, AND INDICATORS........................................ 12
3.1 Front Panel Description .................................................................... 1 2
4. OPERATION.................................................................................... 14
4.1 Safety Precautions ........................................................................... 1 4
4.2 Polarity Reversing ............................................................................ 15
4.3 Measurement of Unknown Voltage or Current ................................. 1 5
4.4 Test Leads ........................................................................................1 6
4.5 DC Voltage Measurement ................................................................ 1 6
4.5.1 DC Voltage Measurement 0-250 mV Range .................................... 16
4.5.2 DC Voltage Measurement 0-1V Range .............................................. 16
4.5.3 DC Voltage Measurement 0-2.5 Through 0-250V Range ................. 17
4.5.4 DC Voltage Measurement 0-500V Range ......................................... 17
4.5.5 DC Voltage Measurement 0-1000V Range ....................................... 18
4.6 AC Voltage Measurement .................................................................1 8
4.6.1 AC Voltage Measurement 0-2.5 Thru 0-250V Range ........................ 1 9
4.6.2 AC Voltage Measurement 0-500V Range .......................................... 20
4.6.3 AC Voltage Measurement 0-1000V Range ........................................ 20
4.7 Output Voltage Measurement ...........................................................21
4.8 Decibel Measurement (-20 To +50 dB) ............................................ 2 2
4.9 Direct Current Measurement ............................................................2 3
4.9.1 Direct Current Measurement 0-50µA Range .................................... 23
4.9.2 Direct Current Measurement 0-1mA Through 0-500mA Range ...... 23
4.9.3 Direct Current Measurement 0-10A Range ...................................... 24
4.10 Resistance Measurements ............................................................... 25
4.11 Measuring Resistance ..................................................................... 25
4.12 Resistance Measurement of Semiconductors ................................. 2 5
4.13 Continuity Tests.................................................................................26
5. OPERA T OR MAINTENANCE .......................................................... 27
5.1 Inspection .........................................................................................27
4
5.2 Battery Replacement ........................................................................ 2 7
5.3 Fuse Replacement ........................................................................... 27
5.4 Test Lead Inspection ........................................................................ 28
5.5 Care..................................................................................................28
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1. INTRODUCTION
1.1 General Description
The Simpson Volt-Ohm-Milliammeter 260 Series 8P, (hereafter referred to as the
260 or as the Instrument) is a rugged, accurate, compact, easy-to-use Instrument
equipped with mirrored dial to eliminate parallax. The Instr ument can be used to
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 in the 260-8P are:
0 - 25V AC/DC Range
Continuity Test Alarm
Individual Dual Jacks for the 500V AC/DC and 1000V AC/DC Ranges
1.2 Overload Protection
All the ranges, with exception of 1V, 10A, 50 µA, 250mV, 500/1000V AC and DC
are protected by an electronic overload protection system. The protection is from
the usual overloads that would damage the VOM. A transistor ized circuit senses
the voltage drop across the indicating instrument and actuates a relay when the
voltage reaches approximately three to four 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. The reset
button is located to the right of the output jack.
!
Due to its sensitivity to overloads, the electronic overload protection relay incorporated in the 260-8P is susceptible to electrostatic fields 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 (floating)
voltage being applied to the Instrument.
Avoid loading the Instrument or its test leads until certain that excessive circuit-toground voltage does not exist.
a. A switch that is opened when the relay latches, opens the relay circuit and
prevents continuous battery drain. This condition occurs 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 9V battery is used for both the R X 10,000V range and the protec-
tion circuit, the VOM is designed to allow the protection circuit to function
normally as long as the R X 10,000V range can be set to zero and an Alkaline Battery is used.
c. The 1 and 2 Amp fuses in the input circuit adds protection to the relay con-
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tacts. Some overload conditions may cause the fuses to burn out as well as
open the relay contacts.
d. When an overload of sufficient magnitude is applied to the VOM, the reset
button will “pop-up” approximately 3/16" above the surface of the panel. To
reset the VOM for normal operation, first 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.
In addition to the overload protection circuit, two diodes protect the indicating
instrument circuit. These diodes limit the current through the coil in case of overload.
Fuses: Basic Overload protection is provided by a small inexpensive and easily
obtainable 3 AG type, 1 Amp , quic k-b low 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 over loads. This fuse is the Bussman Type BBS 2A
600V. A Littlefuse Type BLS 2A 600V fuse may be used as a substitute replacement.
NOTES: If the 260-8P fails to indicate a reading, the 1 Amp or 2 Amp fuse may be
burned out. (Refer to paragraph 5.4 for fuse replacement.) Use only the specified
fuse type.
The 0-10A range is not fused. The shunt connects directly to the -10A and +10A
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
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 1604A alkaline
battery that furnishes 9-volts for the R X 10,000 range and overload circuit. The
1.5-volt D cell is held in place with two spring clips which also serve as battery
contacts. The polarity symbols for the D cell are mark ed near the 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.
!
The 9-volt battery must be installed and tested before the Instrument is ready for
use. 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 -DC
POSITION.
b. Plug the black test lead into the -COMMON jack terminal and touch the other
end of the test lead to the +1 volt input terminal. (The relay reset button
should rise, indicating that the overload circuit is in working condition.)
NOTE: No damage will occur to the 260-8P as a result of this test.
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1.5 Printed Circuit
Most of the component parts are mounted on a printed circuit board which simplifies assembly and maintenance, thus, extending the useful life of the Instrument.
1.6 Phenolic Case
The phenolic case is designed with heavy reinforced walls for maximum durability and provides excellent protection for the circuit components. The case has an
externally accessible battery and fuse compartment. Access to the batteries and
fuses is obtained by unscrewing a single captivated screw at the bottom of the
case and sliding out the compartment cover.
Rubber plug bumpers on the bottom of the case reduce sliding should the 260 be
accidentally pulled by the test leads when the Instrument is on a workbench.
1.7 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.
1.8 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) or the 5000 volt test probe(s) to extend the
Instrument AC or DC voltage range. The test leads and the insulated alligator
clips are rated for the voltage and current ranges available on the 260. Maximum
ratings are 1000V AC or DC or 10 DC amperes. These ratings for the test leads
must not be exceeded in any application.
1.9 Technical Data
1. DC VOLTS:
Ranges: 0-1-2.5-10-25-50-250-500-1000V
Sensitivity: 20,000 ohms per volt
2. DC MILLIVOLTS:
Range: 0-250mV
Sensitivity: 20,000 ohms per volt
3. AC VOLTS:
Ranges: 0-2.5-10-25-50-250-500-1000V
Sensitivity: 5,000 ohms per volt
4. OUTPUT VOL TAGE (AC):
Ranges: 0-2.5-10-25-50-250
Table 1-1. Technical Data
(limited to 350VDC)
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5. DC MICROAMPERES:
Range: 0-50µA
Voltage Drop: 250mV
6. DC MILLIAMPERES:
Ranges: 0-1-10-100-500 mA
V oltage Drop (Approx.): 250 mV, 255 mV, 300 mV, 500 mV
7. DC AMPERES:
Range: 0-10A
Voltage Drop (Approx.): 255mV
NOTE: The 10A range is not internally fused.
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9. *ACCURACY:
DC Voltage Ranges: 2% of Full Scale
DC Current:
0-50 µA Range: 1.5% of Full Scale
Other Ranges: 2% of Full Scale
**AC Voltage
Ranges: 3% of Full Scale
Frequency Response: Referenced to 100 Hz (Figures 4-5 and 4-9)
Resistance Ranges:
R X 1: 2.5° of Arc
R X 100: 2°of Arc
R X 10,000: 2° of Arc
10. DECIBELS:
Range: -20 to +10 dB, -8 to +22 dB,
0 to +30 dB, +6 to +36 dB,
+20 to +50 dB
Reference Level: With zero dB power level equal to 1 mW across
a 600⍀ line.
11. BATTERIES:
Voltage: 1.5V, 9V
NEDA No.: 13F, 1604A
12. FUSE: F1 1A, 250V , type 3A G, quick-acting Littlefuse T ype
312001, F2 2A, 600V Littlefuse Type BLS or
2A 600V, Bussman Type BBS.
13. TEST LEADS: 1 red, 1 black, 48" long.
14. SIZE: 5½” x 7" x 3 “ (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.
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*Accuracies specified 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 specified voltage with respect to ground,
which may be safely and continuously applied to the circuit of an Instrument.”
1.10 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 (indication). 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 accur acy 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.
1.11 Safety Considerations
This Operator’s Manual contains special caution and warning symbols which
alert the user to hazardous operating and service 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.
Please adhere to these instructions to ensure the safety of operating and servicing personnel and to retain the operating conditions of the Instrument.
1.12 Audio Alarm
The 260-8P Audio Alarm is a transducer which will emit an audible sound when
the operator of the Instrument intends to quickly determine the continuity of a
circuit.
NOTE: Not protected by Electronic Overload Protection System.
!
Do not make Circuit Continuity Tests with electrical power “ON”. Turn “OFF” all
electrical power.
Table 1-2. Items and Accessories Furnished with This Instrument
Quantity Description Number
1 Test Lead Set - one red and one black (48” long) 00043
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
2 1Amp, 250V Fuse, Littlefuse Type #312001
1 2A, 600V Fuse, Littlefuse Type BLS or
(Bussman Type BBS)
1 Operator’s Manual 6-114339
*Batteries are standard items replaceable from local retail stores.
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