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

Page: 13 / 46

INTRODUCTION
1864-1644 Positive Polarity Megohmmeter
3
Figure 1.1
Reference Name Type Function
1
POWER
OFF 2-position toggle
switch
Turn power on and off.
2 Meter
4-in. meter with
plastic cover
Indicates the value to be
multiplies by the multiplier
switch.
3
SET
∞
HIGHEST RANGE
Knob-rotated
control
Adjusts high end of meter
scale on highest resistance
range to compensate for offset
current.
4 SET
∞
Knob-rotated
control
Adjusts high end of meter
scale on highest resistance
range to compensate for offset
voltage in the voltmeter.
5 GUARD
Insulated binding
post
For guarded measurements. It
can accept a shorting link to
the ground post.
6 Ground
Uninsulated
binding post
Grounds the Unknown- or
guard. Contains a shorting
link.
7 UNKNOWN -
Insulated binding
post Connects the - side of the
unknown to the megohmmeter.
8 U
Insulated binding
post Connects the + side of the
unknown to the megohmmeter.
9 DANGER
Indicated light
shaded red
Glows red when the function
switch is in the CHARGE or
MEASURE position.
10 Multiplier
8-position rotary
switch
Selects resistance range.
11
MEASURE
CHARGE
DISCHARGE
3-position toggle
switch Selects the operating position
applied to the unknown.
12 TEST VOLTAGE
3 rotary switches:
10-position
9-position
2-position
Select voltage in 1-V steps
from 10 to 109 V and in 100-V
steps from 100 to 1090 V.