Heathkit IM-18 User Manual

Assembly
and
‘TABLE OF CONTENTS
Operation
of
the
Specifications,
.
.
Introduction, . 4
Circuit Description,
Parts List,
VACUUM TUBE
VOLTMETER
‘Step-By-Step
Assembly
Tange Switch Assembly...
MODEL IM-18 Front Panel Mounting,
Knob Installation,
Front Panel Wiring, 2.
Cireult Board Wiring...
Connecting Cable, . .
Wiring Circuit Board To The Panel,
‘Mounting The Battery Spring. .
Meter, Bracket, And Circuit Board
Installation, ....se0e ee
Final Wiring... +,
Preliminary Test,
Preparation Of Test
Leads, .
‘Test And Calibration,
using Your VIVM,
In Case Of Difficulty, . .
‘Troubleshooting Chart... +. eeeeeeee
Maintenance, 6. +
Accessory Probes, .
Schematic,
. .
(fold-out
from
page).
....
|33
Replacement Parts Price List,.....+++ [94
HEATH COMPANY
BENTON HARBOR, MICHIGAN 49022

Heathkit IM-18 Specifications

General

Brand	Heathkit
Model	IM-18
Category	Measuring Instruments
Language	English

Summary

Specifications

Electronic DC Voltmeter

Details specifications for the Electronic DC Voltmeter function.

Electronic AC Voltmeter

Details specifications for the Electronic AC Voltmeter function.

Electronic Ohmmeter

Details specifications for the Electronic Ohmmeter function.

Introduction to the VTVM

Circuit Description

Test and Calibration Procedures

Zero Adjust

Adjusts the meter pointer to zero for DC measurements.

DC Calibration

Calibrates DC voltage readings using a test point.

Ohms Check

Checks ohmmeter function and sets infinity scale.

AC Calibration

Calibrates AC voltage readings.

AC Calibration Without Line Cord Adapter

Procedure for calibrating AC voltage without a line cord adapter.

Aging and Final Calibration

Recommends aging tubes and performing final calibration for accuracy.

Troubleshooting Chart

Completely Inoperative

Steps to diagnose and resolve a completely inoperative instrument.

Inability to Obtain DC Balance

Troubleshooting steps for issues with DC balance.

AC Balance Issues

Procedure for adjusting AC Balance and related issues.

Inaccurate AC Readings

Troubleshooting steps for inaccurate AC voltage readings.

Inaccurate DC Readings

Troubleshooting steps for inaccurate DC voltage readings.

Ohms Inoperative

Troubleshooting steps for the ohmmeter not functioning.

AC Inoperative

Troubleshooting steps for the AC measurement function.

Ohms Inaccurate

Troubleshooting steps for inaccurate ohmmeter readings.