iET PRS-300 Series, Руководство по эксплуатации, Страница: 20 / 50

OPERATION
PRS-300 Series
10
next “preferred” resistance value.
RATIOMETRIC allows a custom toler-
ance value to be entered by the user. The
default value is 0.8% but can be set to the
required value in %.
3.4.5 Tables Key
Pressing the TABLE key allows use of
tables. There are 9 tables that can be selected.
The
fi rst 4 tables, 1 to 4, are de fi ned as PT-100
C, PT-100 F, PT-1000 C and PT-1000 F where
C is degrees Celcius and F is degrees Fahren-
heit.
Press TABLE key and then a number key
0 through 9 followed by the ENTER key will
select a table. Table 0 is de fi ned as no table is
used and resistance is shown.
Figure 3-4 No translation Table
Press the numerical value 1 to 9 on the
keypad for the desired table to be used. For
example pressing
TABLE key, then “1” and
ENTER key will select use of the PT-100 C
table as shown in Figure 3-5
Figure 3-5 Table 1 PT-100 C
Once the table is selected the display
will change showing temperature on top and
resistance on bottom. Any value entered via
front panel or remotely will be assumed to be a
table value rather than a resistance value. For
example if 0.25 is entered then the screen will
look like Figure 3-5 showing temperature on
top line and resistance on the bottom line.
Figure 3-5 PR-100 C set to 0.25 °C
For negative temperatures press the 000/
(-) key prior to entering the value.
If a value is not listed in the table and is
entered using the numeric keypad or selected
using the
UP and DOWN keys interpolation is
used between the two closest table values.
Custom tables can be entered in locations
5 to 9 by using the USB interface and remote
CONIG:TABLE commands. See Appendix B
for more information.
3.4.6 Increment INCR Key
The INCR key allows entry of a numeric
value. The numeric value representing the
step or increment size the
UP and DOWN
keys use.
For example pressing INCR key and then
10 would result in the displayed value being in-
cremented or decremented 10
Ω for each time
the UP or DOWN key is pressed.
INCR can also be used for tables in the
same way so that the operator can press the UP
or DOWN key and increment or decrement the
displayed value in °C or °F.
3.4.7 OPEN Key
The OPEN key opens all relays in the
PRS-300 resulting in high resistance at the
resistance terminals. The display will shown
OPEN Ω . Pressing the OPEN key again will
cause the resistance to return to the previous
set value.
For short enter lowest value of 0.1 Ω us-
ing keypad or remote.