User manual

Front Panel Operation
2001-900-01 Rev. K/ August 2010 3-51
RESLN
The RESLN parameter sets the display resolution. It is
discussed in paragraph 3.4.1, DC and AC voltage. Only the
differences for temperature are noted here.
Resolution for temperature is not expressed in number of
digits, but in fractions of a degree, ranging from 1° to 0.001°.
The accuracy of RTD and thermocouple measurements are
rated at different resolutions; refer to the Specifications.
If the temperature resolution is AUTO, the resolution is
forced to match the sensor type. Refer to Table 3-26 for the
resolution associated with the various sensors.
Multiple displays
The available multiple displays for temperature depend on
the presently selected sensor type, except for the multiple
display that shows temperature in three different units:
+0000.0 °C
+0000.0 °F +0000.0 K
RTD measurements have a multiple display for the
resistance of the RTD, such as:
RTD Resistance = +0.0000 
Thermocouple measurements have multiple displays for the
thermocouple voltage and reference junction temperature.
Sample displays are:
Thermocouple Voltage = 0.0000mV
Reference junction = 00.0 °C
Note that the reference junction temperature is shown in the
units selected by the SET TEMP UNITS menu. The display
of two blinking question marks at the right of the reference
junction temperature indicates an overflow of the reference
junction measurement. Thermocouple measurements will be
made normally using the existing reference temperature
value.
3.5 Range
The selected measurement range affects both the ultimate
resolution and accuracy of the measurements as well as the
maximum signal that can be measured. The range setting
(fixed or auto) for each measurement function is saved when
changing functions.
The following paragraphs discuss range resolution and man-
ual and auto-range operation.
3.5.1 Display resolution
The display resolution of a Model 2001 reading depends on
the selected range and the resolution setting. The default and
maximum display resolutions for every range on each
function are included in the Specifications.
You can set the display resolution, as described in paragraph
3.4.
3.5.2 Maximum readings
The full scale readings for every range on each function are
included in the Specifications. Input values more than the
maximum reading listed cause the “Overflow” message to be
displayed.
3.5.3 Manual ranging
To select a manual range, simply press the RANGE  or
RANGE  key. The instrument changes one range per key
press. The selected range is displayed on the bottom line of
the display, such as:
+000.0094 mVDC
Range: 200 mVDC
Once the highest or lowest range has been selected, pressing
the corresponding key has no further effect, except for the
display of a momentary informational message, for example:
Range at maximum: 1000 VDC
If the instrument displays the “Overflow” message on a
particular range, select a higher range until an on-range
reading is displayed. Use the lowest range possible without
causing an overflow to ensure best accuracy and resolution.
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Temperature auto resolution
Sensor
Resolution
Degree Digits
RTDs 2-, 3-, or 4-wire 0.01 5.5d
Thermocouples J, K, T, E 0.1 4.5d
Thermocouples R, S, B, N 1 3.5d
Note: If the resolution is AUTO and the integration time SET-BY-
RSLN, the integration time will be 1.0 PLC.