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Ballantine Manuals
Measuring Instruments
345A
Instruction book
Ballantine 345A Instruction Book
Logarithmic dc-ac voltmeter/ohmmeter
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
General Information
Features and Use
General
DC Voltmeter
Resistance Meosurement from
AC Voltmeter
Ohmmeter
DC Calibrator
DC Ammeter
Some Applicotions of Model 345A
DC Voltage
AC Voltage
Resistance Measurement
Technical Characteristics
DC Voltmeter
AC Voltmeter
Ohmmeter
DC Ammeter
DC Calibrotor
AC BAL Voltage
General
Operation
Function of Controls
Probe Storage
Power Connection
Warmup Period
Balance of DC Amplifier
DC Voltage Measurements above 0.1
DC Voltage Measurements below 0.1
Null Measurements of DC Voltages
Ungrounded or Differential Measurements
AC Voltage Measurements
Warmup Period of AC Probe
AC Balance Adjustment
Low Distortion Sine Wave AC Voltage Measurements from 0.2 V to 350 V RMS in Frequency Ronge 20 Hz to 100 Mhz
Max RMS Voltage for AC Probe
Low Distortion Sine Wave Voltage Measurements below 200 MV
AC Voltage Measurements above 100 Mhz
Overloading AC Probe
Peak AC Voltage Measurement of Symmetrical
Repetitive Waveforms
Peak AC Voltage Measurements of Unsymmetrical
Lomax DC Voltage Applied to AC Probe
11 Above Ground Measurements of AC Voltage
Resistance Measurements
Resistance Measurement from Lao MD to 5000 MO
Res;Ston,E Meosu.ement Hom 0 to in
Voltage and Power Distribution of Resistance Measurement from 1 U to 5000 MO
Current Measurements
DC Currents
AC Currents
Semiconductor Devices, Diodes and Transistors
Forward Characteristics of Diodes and Transistors
Measurement of Reverse Current of Diodes or Transistors
Temp
Insulot;On Res;Ston,E Meosu.ements up to 10 TQ 110" Q)
Ovedood Consldemhons
DC Voltmet
I 0.2 AC Volt Met
DC Voltmete
AC Voltmet
Impedon,E between COMMON and Inst.ument Case
OHMMETER Sou"E Voltage Is I V
I I
Circuit Description
General
Bosic Circuit
Input Attenuator
Input Filter and Protective Devices
DC Differential Amplifier
Indicator
DC Balance
AC Prabe
AC Balance
Ohmmeter
DC Calibration Source
Power Supply
Maintenance
General
2000 Hour Check
Necessary Maintenance Equipment
Removal Af Instrument Cover
2000 Hour Check
Adjustment of Regulated Heater Voltage
Voltage Scale Linearity Check at Bottom Scale
Check of Calibration of 1 V DC Range
Check of OHMS Source Voltage
Check of AC 1 V Range Calibration
Check of AC 10 V Range Calibration
Check of AC 200 MV Range Calibration
4000 Hour Check
Check. for Low Tronsconductance
Grid Current Check of V2, 5692
Check of Calibration of AC 100 V Range
Check of DC Calibrator
Check of AC High Frequency Response
Troubleshooting
General
Replacement of Isolation Resistor R1
Service of AC Probe
Checking Differential Amplifier
Troubleshooting Table for Madel 345A
Shipping Instructions
Replacement Parts List
Accessor Ies
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INSTRUCTION BOOK
for
MODEL 345A
LOGARITHMIC DC-AC
VOLTMETER/OHMMETER
BALLANTINE LABORATORIES, INC.
BOONTON, NEW JERSEY
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Table of Contents
Troubleshooting
TROUBLESHOOTING
24
Checking Differential Amplifier
25
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