AT&T M9B Manuals

1 pdf manual(s) AT&T M9B for free download (Document Types: Description and application manual)

AT&T M9B Description and application manual [PDF] (12 pages)

  • Identifier: id-1826993
  • Brand: AT&T
  • Device: M9B Measuring Instruments
  • Type: PDF
  • Key Aspects: Safety Recommendations and Warnings, Storage and Care Recommendations, Critical Operational Precautions
  • UPD Date: 07.07.2026
  • Source File: 1895772.pdf
  • Pages: 12
  • Description: Product instruction handbook for the AT&T M9B.
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  • TCI Library https://www.telephonecollectors.info/ SECTION 100-513-101 2, CIRCUIT AND EQUIPMENT FEATURES (A) M9B Meter 2,01 A schematic of the M9B Meter is shown in Fig, 4, The scale ranges provided are as follows: Voltmeter Ranges A-C or D-C (2000 Ohms Per Volt) 0-3 volts 0-15 volts 0-30 volts 0-150 volts 0-300 volts Ammeter Ranges D-C Only 0-150 milliamp, 0-3 amp. 0-]6 amp. Ohmmeter Ranges 0-1000 ohms 0-10,000 ohms 0-100,000 ohms 0-),,000,000ohms The accu
  • TCI Library https://www.telephonecollectors.info/ Fig, 3 - KS-9307 Carrying Case with KS-93()8 Carrying Strap 2.08 A 4-1/2-volt battery is required for use in the meter, The battery mounts in a bracket inside the meter case, Any one of the following batteries may be used: Bright Star 03-17s Eveready 781 Burgess 5360 Ray-0-Vac 531R Bond 317 2,09 The knob BATTERY ADJUS1'MENT controls a rheostat which adjusts the
  • TCI Library https://www.telephonecollectors.info/ SECTION . 100-513-101 when the lid is open the meter can be used with- out removing it from the case. A simple clamp- ing device holds the meter securely in posi- tion in the case, cushioned between sponge rub- ber blocks on sides, end, and bottom, There is room for two spare dry batteries inside the carrying case, in the space between the hinged side of the case and the meter; one may be placed on each sid
  • TCI Library https://www.telephonecollectors.info/ Fig. 5 - M9B !1eter - Face View 3.06 The resistance scale (lower half of the dial (Fig. 5)) is read directly in ohms if the test cords are connected to X and R (0-1000-ohm scale). If the test cords are con- nected at X and RxlO, the scale reading should be multiplied by ten; if the connections are at X and RxlOO multiply the scale reading by 100; if connections are at X and RxlOOO, multiply the scale readin
  • TCI Library https://www.telephonecollectors.info/ SECTION 100-513-101 battery, cause the zero setting to need a dif- ferent BATTERY ADJUSTMENT knob position for each resistance measuring 8Cale range, There- fore, when accuracy of the measurement is im- portant, it is desirable to check the zero set- ting (by short-circuiting the test leads) each time the scale connection to ~he meter jacks is changed, Also, when connected to the X and R jacks, the current
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TCI Library https://www.telephonecollectors.info/ BELL SYSTEM PRACTICES Plant Series SECTION 100-513-101 Issue 1, April, 1946 AT&TCo Standard M9B METER (PORT ABLE VOLT-OHM-MILLIAMMETER DESCRIPTION AND APPLICATION CONTENTS 1. GENERAL . . . . . 2. CIRCUIT AND EQUIPMENT FEATURES . . (A) M9B Meter. . . . . . . . . . . (B) Test Leads, Carrying Strap, and Carrying Case . . . . . . 3. OPERATION , . . . . . (A) Precautions . . . . (B) Preparation. . . . . . . . (C) Scales . . . . . . . . (D) Voltage Measurements . . . . (E) Current Measurements (F) Resistance Measurements . (G) Capacitance Measurements 4. MAINTENANCE. . . . . . . . . . . . (A) Voltage Accuracy . . (B) Battery Replacement . . . . . . 5, REPAIR . . . . . . . . . . . . . . (A) General (B) Meter Unit . . . . . . . (C) Meter Glass and Zero Corrector (D) Pin Jacks • 6. REPLACEMENT PARTS 1. GENERAL . . . . . PAGE l 2 2 3 4 4 4 4 5 5 5 6 8 8 c . 9 9 10 10 11 12 1,01 This Section describes the Western Elec- tric Company M9B Meter (portable volt- ohm-milliammeter), includes instructions for its use and methods for replacement of parts. The information . is also generally applicable to the D-166852 Meter. 1,02 The M9B Meter is a small portable multi- meter designed for general maintenance use for the measurement of a-c and d-c volt- ages, d-c current, and resistance, Five volt- age scale ranges are provided, both a-c and d-'c, from 0-3 to 0-300 volts, with a sensitivity of 2000 ohms per volt on all scales. Three d-c current ranges are provided from 0-150 milli- amperes to 0-15 amperes, and four resistance measuring scale ranges from 0-1000 ohms to 0-1,000,000 ohms, 1.03 A special double-pointer meter movement provides unusual legibility of scales; the linear voltage and current scale markings are grouped in the upper semicircle of the me- ter fa~e, and the nonlinear resistance scale is located under the pointer sweep on the lower semicircle of the meter face, The wide angle sweep (150 degrees) of the pointer adds to the legibilityof the scales. A nonglare, hardened glass window is used. All circuit connections are made to positive contact pin jacks, Fig, 1 shows a face view of the M9B Meter. Fig. 1 - M9B Meter - !''ace View 1.04 The M9B Meter is furnished with a pair of KS-9290 test pick leads• a pair of KS-9291 test clip leads and a KS-9308 carrying strap. A 4-1/2-volt battery (par, 2.08) is required for use in the meter. The meter is equipped with "D" loops for attaching a neck carrying strap (KS-9308), A fibre carrying case (KS-9307) is available for carrying the meter and test leads. (See Figs. 2 and 3.) The M9B Meter is similar to the Western Electric Company D-166852 Vol~- ohm-milliammeter which was recently developed for maintenance use with carrier, central office~ and telegraph equipments. Copyright, 1946 1 by American Telephone and Telegraph Company Printed in U.S. A, Page 1

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