Keithley 2001 Operator's Manual page 82

Front Panel Operation
THERMOCOUPLE TYPE:
THERMOCOUPLE SETUP menu brings up a menu of
thermocouple types:
THERMOCOUPLE TYPE
J K T E R S B N
To select a type, highlight it and press ENTER.
REF-JUNCTIONS: This item of the THERMOCOUPLE
SETUP menu allows you to select one of five reference
junctions for further configuration. Typically, each
thermocouple card uses a single reference junction. The
menu is displayed as follows:
CONFIGURE REFJCNS
JCN1 JCN2 JCN3 JCN4 JCN5
After choosing one of the reference junctions, you can
configure it further or acquire a reference temperature (to
update the stored reference temperature), as shown in the
typical following menu:
REFERENCE JUNCTION#1
CONFIGURE ACQUIRE-REF-TEMP
Choosing the ACQUIRE-REF-TEMP option updates the
stored reference temperature used for generating a
temperature measurement. If the junction type (JCN) is
simulated, the defined simulated junction temperature is
used. If the junction type is real, you must manually close
that channel from the scanner before acquiring the
temperature.
Selecting the CONFIGURE option displays a configuration
menu for a particular reference junction (#1 through #5):
CONFIGURE REFJCN#1
SIMULATED-TEMP REAL-JUNCTION
The SIMULATED-TEMP option allows you to enter a
default temperature. Typical reference junction temperatures
are 0°C and 23°C. (Note the reference junction temperature
is shown in the units selected by the SET TEMP UNITS
menu.) The REAL-JUNCTION option lets you enter values
for a temperature coefficient for the selected reference
junction (in mV/°C) and an offset voltage (in mV at 0°C).
Consult the Model 7057A or 7402 manual for correct
configuration.
UNITS
This parameter selects the displayed units for temperature
measurements. You can program the temperature units
parameter as follows:
3-50
This option of the 1. From the CONFIG TEMPERATURE menu, select
UNITS and press ENTER. The following menu is dis-
played:
SET TEMP UNITS
DEG-C DEG-F K
2. Highlight the desired units and press ENTER.
There is a multiple display for the temperature function that
shows the reading expressed in all three temperature units.
SPEED
The SPEED parameter sets the integration time of the A/D
converter, the period of time the input signal is measured
(also known as aperture). It is discussed in
DC and AC voltage. Only the differences for temperature are
noted here.
The SET-BY-RSLN parameter optimizes the integration
time for the present resolution setting. The defaults for set-
by-resolution integration times of temperature are listed in
Table 3-25.
q~ÄäÉ=PJOR
Temperature integration time set-by-resolution
Resolution Resolution
degrees digits
1 degree 3.5d
0.1 degree 4.5d
0.01 degree 5.5d
0.001 degree 6.5d
Note: If the integration time is SET-BY-RSLN and the resolution
AUTO, the integration time will be 1.0 PLC and the resolution set
by sensor.
FILTER
The FILTER parameter lets you set the digital filter response
and control its on/off operation. It is described in
3.9. Only the specifics for temperature are covered here.
The advanced filter is not available for the temperature
function.
The AUTO parameter for a digital filter optimizes its use for
the present measurement function. The defaults for
automatic filtering of temperature are as follows:
State Type
On Averaging
2001-900-01 Rev. K/ August 2010
paragraph 3.4.1,
Integration
time
1.0 PLC
1.0 PLC
1.0 PLC
1.0 PLC
paragraph
Averaging
Readings Mode
10 Moving