You have an old analog ammeter in your hand and are wondering what you can do with it.
In order to use that Analog Ammeter to do stuff, you need to know two particular things about it.
In this video I am going to show you how to determine the two things you need to know about that ammeter:
1. Its Internal Resistance
2. Its Full-Scale Current
I will show you how to
measure higher currents
measure voltage
with a properly characterized ammeter in my next two videos in this series.
----------------------------
Time Marker Notes
00:05 Introduction
01:53 Preliminaries ... What you need
03:26 What we are going to do here
03:46 ZEROING the meter before we begin
05:25 1. Determining the Internal Resistance
07:04 1.a. Establish full-scale indication
09:23 1.b. Measure applied voltage
09:44 1.c. Install parallel variable resistor
10:09 1.d. Adjust resistor for half-scale indication
12:07 1.e. Measure your resistor values
13:11 1.e.1. Measure resistance OFFEST
13:30 1.e.2. Measure Series Resistor value
13:51 1.e.3. Measure Parallel resistor value
14:10 2. Calculate Internal Resistance and Full-Scale Current
14:52 2.a. The REAL series resistor value
15:29 2.b. The REAL parallel resistor value
16:14 2.c. Full-Scale Current calculation
18:03 2.d. The Characteristics of this Ammeter
18:22 Conclusions and Final Comments
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