Quick Reference Guide 11
The DCV1 function has five measurement ranges: 10mV, 100mV, 1V, 10V, and 100V. The
DCV2 function has three measurement ranges: 100mV, 1V, and 10V. The range setting
(fixed or AUTO) is remembered by each voltage function. There is no range selection for
temperature (TEMP1 and TEMP2) measurements. Temperature measurements are
performed on a single, fixed range.
The RANGE
and
keys are used for manual range selection. Note that pressing either
of these keys disables auto range.
Rate
The RATE key selects the integration time of the A/D converter. This is the period of time
the input signal is measured (also known as aperture). The integration time affects the
amount of reading noise, as well as the ultimate reading rate of the instrument. The integra-
tion time is specified in parameters based on a number of power line cycles (NPLC), where
1 PLC for 60Hz is 16.67msec (1/60) and 1 PLC for 50Hz (and 400Hz) is 20msec (1/50).
Front panel RATE selections are explained as follows:
• 0.1 PLC — Selects the fastest front panel integration time. Select 0.1 PLC (fast) if
speed is of primary importance (at the expense of increased reading noise).
•1 PLC — Selects a medium integration time. Select 1 PLC (medium) when a com-
promise between noise performance and speed is acceptable.
•5 PLC — Selects the slowest front panel integration time. Selecting 5 PLC (slow)
provides better noise performance at the expense of speed.
Digits
The DIGITS key sets display resolution for the Model 2182. Display resolution for voltage
readings can be set from 3
½
to 7
½
digits. For temperature readings, resolution can be set
from 4 to 7 digits.
You can have a separate digits setting for voltage and temperature functions. The digits set-
ting for a voltage function applies to the other voltage function. For example, if you set
DCV1 for 5
½
digits, DCV2 will also be set for 5
½
digits. Similarly, the digits setting for a
temperature function applies to the other temperature function. Setting TEMP1 for 6 digits,
also sets TEMP2 for 6 digits.
Digits has no effect on the remote reading format. The number of displayed digits does not
affect accuracy or speed. Those parameters are controlled by the RATE setting.
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