IET Labs, Inc. 1864-1644, User And Service Manual

Page: 15 / 46

INTRODUCTION
1864-1644 Positive Polarity Megohmmeter
5
1.4 Symbols
These instruments indicate the resistance of the
unknown in multiples of ohms. The relationship
between ohms (
Ω ), kilohms (k Ω ), megohms (M Ω ),
gigaohms (G Ω ), and teraohms (T Ω ) is as follows:
1 M
Ω
= 10
6
Ω
= 10
3
k
Ω
I G
Ω
= 10
9
Ω
= 10
6
k
Ω
= 10
3
M
Ω
1 T
Ω
= 10 12
Ω
= 10 9 k
Ω
= 10 6 M
Ω
= 10 3 G
Ω
1.5 Connections
The UNKNOWN, GUARD and ground terminals
are standard 3/4-in. spaced binding posts that accept
banana plugs, standard telephone tips, alligator clips,
crocodile clips, spade terminals and all wire sizes up
to number eleven (Figure 1-3).
When several measurements of components with
leads are to be made, consult IET for an appropriate
test jig or
fi xture.
Figure 1-3. Methods of connection to the measurement terminals