BASIC DMM OPERATION
2.3.4 CAL LOCK Switch q
2.3.7 input Terminals~
The CAL LOCK switch disables calibration from the front
The input terminals are intended to be used with safety
paml OI over the IEEE488 bus. Before the unit can be
shrouded te$ leads to help minimize the possibility of con-
calibrated, this switch must be enabled. See paragraph 6.4
tact with live circuits. Note that all the terminals except
for more calibration information.
AMPS are duplicated on the rear panel. The front panel
INPUT switch determines which set of terminals is active.
2.3.5 INPUT Switch@
VOLTS OHMS HI and LO-The VOJ2-S OHMS HI and LO
terminals are used for making DC volts, AC volts, and two-
The front panel JNPLTI switch selects between the front
wire resistance measurements.
and rear panel input terminals. Front panel terminals are
selected with the switch-aut, while rear-panel term&.&
AMPS-AMPS is used in conjunction with LO to make
are selected with the switch in. The switch positions are
DC current and AC current measWements.
marked immediately above the switch on the front panel.
OHMS SENSE HI and LO-These terminals are used with
VOLTS OHMS HI and LO to make four-wire resistance
2.3.6 Current Input Fusea
measurements.
Theclm . -. . .
The current input fuse is a 3A normal blow fuse that~ pm=
2.4 REAR PANEL FAMILIARIZATION
tects the AMY> Input rrom excess
t&s the AMPS input from excessive c&rent. See”
paragraph 6.3 for fuse replace~“en+ “7‘
paragraph 6.3 for fuse replacement procedures.
The rear panel of the Model 199 is shown in Figure Z-2.
The various items located on the rear panel are discussed
in the following paragraphs.
r!l
6
Figure 2-2. Model 199 Rear Panel
2-5
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