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Operation
2.5
Measurement Range Selection
For normal operation the 1880 RANGE should remain in AUTO (red light ON). This
will eliminate the potential for incorrect settings of the measurement range. In cases
where manual range selection is desired proceed as follows.
Press [RANGE UP] or [DOWN] button to set range manually (Auto red light
OFF). Pressing [UP] or [DOWN] exits AUTO ranging automatically.
[UP] or [DOWN] button selects one of nine possible measurement ranges. The
units ranging from milliohms (m
) to megaohms (M
) are indicated below the
digital display. Refer to Table 2-1 below to determine the full-scale resistance
range.
Table 2-1: Measurement Ranges (Full Scale)
Full-Scale Range
20m
200m
2
20 200 2k 20k 200k 2M
Resolution
1u
10u 100u 1m 10m 100m 1 10 100
To return from a manual range setting to autoranging, press the [RANGE AUTO]
button (red light ON).
Figure 2-4: Display with Incorrect Range Setting
2.6 Trigger
Selection
To initiate measurements on the 1880 instrument select the internal trigger (repetitive
measurements) or external trigger (single measurements). Internal trigger is the default
mode of the instrument at power-up. To change the TRIGGER proceed as follows:
Press [MAN/EXT] (red light ON) to select external triggering or single
measurement mode. Once selected a single measurement is made each time this
[MAN/EXT] button is pressed.
Press [INT] (red light ON) to return trigger to internal or continuous measurement
mode.
1880
MILLIOHMMETER
m
M
k
