260 8
Simpson 260® Series 8
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 symbols 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
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 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 ar ticles
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 author ized 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 Co.
2
NOTES
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Contents
1. INTRODUCTION ................................................................................. 7
1.1 General Description ........................................................................... 7
1.2 Overload Protection ............................................................................ 7
1.3 Internal Batteries ................................................................................ 7
1.4 Printed Circuit ..................................................................................... 8
1.5 Phenolic Case .................................................................................... 8
1.6 Adjust-A-Vue Handle .......................................................................... 8
1.7 Test Leads .......................................................................................... 8
1.8 Technical Data .................................................................................... 8
1.9 Definition of Accuracy....................................................................... 1 0
1.10 Safety Considerations ...................................................................... 10
1.11 Accessory AC High Voltage Probe ................................................... 1 1
1.12 Amp-clamp Model 150-2 .................................................................. 1 1
2. INST ALLATION ................................................................................. 11
2.1 Unpacking and Inspection ............................................................... 11
2.2 Warranty ...........................................................................................11
2.3 Power Source Requirements ........................................................... 12
2.4 Operating Position ............................................................................ 1 2
3. CONTR OLS, JA CKS AND INDICATORS........................................... 1 2
3.1 Front Panel Description .................................................................... 12
4. OPERATION ..................................................................................... 14
4.1 Safety Precautions ........................................................................... 14
4.2 Polarity Reversing ............................................................................ 15
4.3 Measurement of Unknown Voltage or Current ................................. 1 5
4.4 Test Leads ........................................................................................ 1 5
4.5 DC Voltage Measurement 0-250mV Range ....................................16
4.6 DC Voltage Measurement 0-1V Range ............................................16
4.7 DC Voltage Measurement 0-2.5 ~ 0-250V Range ...........................17
4.8 DC Voltage Measurement 0-500V Range .......................................17
4.9 DC Voltage Measurement 0-1000V Range ..................................... 1 8
4.10 AC Voltage Measurement 0-2.5 ~ 0-250V Range ...........................18
4.11 AC Voltage Measurement 0-500V Range ........................................ 1 9
4.12 AC Voltage Measurement 0-1000V Range .....................................20
4.13 Output Voltage Measurement ...........................................................21
4.14 Decibel Measurement (–20 to +50 dB) ........................................... 2 2
4.15 Direct Current Measurement ............................................................ 2 3
4.15.1 Direct Current Measurement 0-50µA Range ................................... 23
4.15.2 Direct Current Measurement 0-1mA through 0-500mA Range ...... 24
4.15.3 Direct Current Measurement 0-10A range ...................................... 24
4.16 Resistance Measurements ............................................................... 25
4.16.1 Measuring Resistance ...................................................................... 25
4.16.2 Resistance Measurement of Semiconductors ................................. 26
5. OPERATOR MAINTENANCE .......................................................... 27
5.1 Inspection .........................................................................................27
5.2 Battery Replacement ........................................................................ 2 7
5.3 Fuse Replacement ........................................................................... 28
5.4 Test Lead Inspection ........................................................................28
5.5 Care ..................................................................................................28
4
NOTES
5
NOTES
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1. INTRODUCTION
1.1 General Description
The Simpson Volt-Ohm-Milliammeter 260 Ser ies 8, (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 Instrument 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 260-8 are:
0-25V AC/DC Range
Mirrored Dial
1.2 Overload Protection
No single protective device nor even a combination of devices as found in the
260 can fully protect a multipurpose Instrument under all overload conditions.
Overloads of such severity as to damage the Instrument despite all the built-in
protection provided are possible when the Instrument is misused. The 260-8 has
been designed to afford maximum instrument protection under overload conditions which might occur within the measuring capabilities of the Instrument, however, the operator must exercise care to avoid severe overloads, particularly
when working in high voltage circuits.
Basic overload protection is provided by a small inexpensive and easily obtainable 3 AG type, 1 Amp, quick-blow fuse. This fuse is rated to interrupt circuit
voltages up to 250 V. F or maximum protection it is important to replace the 1A fuse
with the Littlefuse type 312001 only.
A supplemental high energy fuse is provided for additional protection from severe overloads. This fuse is rated for an interruption capacity of 10,000 Amps up
to 600 V. (Littlefuse Type BLS or Bussman Type BBS). If the Instrument fails to
indicate a reading, 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 r ange is not fused. The shunt connects directly to the –10A and
+10A jacks.
T wo diodes connected across the meter mo vement affords protection to the mo vement 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. 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 marked 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.
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1.4 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.
1.5 Phenolic Case
The phenolic case has heavy reinforced walls for maximum durability and provides excellent protection for the circuit components. Batteries and fuses can be
accessed 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.
1.6 Adjust-A-Vue Handle
A carrying handle is attached to the Instrument case. The handle ma y 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 provides 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) 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.
NOTE: These ratings for the test leads must not be exceeded in any application.
1.8 Technical Data
TABLE 1-1. Technical Data for the 260-8
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 V OLTS:
Ranges: 0-2.5-10-25-50-250-500-1000V
Sensitivity: 5,000 ohms per volt
4. OUTPUT VOLT AGE (AC):
Ranges: 0-2.5-10-25-50-250 (limited to 350 VDC)
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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.): 255 mV
NOTE: The 10A range is not internally fused.
8.
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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 4-4 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
* 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
10. DECIBELS:
Range: –20 to +10 dB, –8 to +22 dB, 0 to +30 dB,
Reference Level: With zero dB power level equal to 1 mW across a
11. BATTERIES:
Voltage: 1.5V, 9V
NEDA No.: 13F, 1604
12. FUSE: F1 1A, 250V , type 3A G, quick acting Littlefuse Type
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)
V5.1V5.1V9
Am521Am52.1Aµ57
+6 to +36 dB, +20 to +50 dB
600⍀ line.
312001, F2 2A, 600V Littlefuse Type BLS or 2A
600V, Bussman Type BBS.
9
15. WEIGHT: 3 lbs. (1.359 kg)
16. ***RATED-CIRCUIT-TOGROUND VOLTAGE: 1000V AC/DC Max.
***Per ANSI C 39.5 April 1974: “The specified voltage with respect to ground,
which may be safely and continuously 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 (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 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 flagged by CAUTION or WARNING symbols throughout the publication, where applicable, and is
defined on the inside front cover of the manual 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.
TABLE 1-2. Items and Accessories Furnished with this Instrument
Quantity Description Catalog No.
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 13F
*1 9.0 Volt Cell, NEDA 1604
2 1 Amp, 250V Fuse, Littlefuse T ype #312001
1 2A, 600V Fuse, Littlefuse Type BLS or
(Bussman Type BBS)
1 Operator’s Manual 6-114338
* Batteries are standard items, replaceable from retail stores.
TABLE 1-3. Additional Accessories
Description Catalog Number
Deluxe Case ......................................................................................... 00812
Leatherette Ever-Redy Hard Case, Drop Front ................................... 00805
Model 150-2 Amp-Clamp ..................................................................... 00545
Model 151-2 Line Splitter..................................................................... 00544
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