DayTronic 3500 Series, Instruction Manual

Page: 52 / 122

e. To display the current analog-output gain value, press ENTER . If you don't
want to display the gain, press SETUP to return to the "Setup" display.
f. To change the amplification value, use the NUMERIC BUTTONS as explained
in Section 1.e to modify the displayed number (again, you cannot change its
"0.1" resolution). NOTE: The instrument will not accept a value outside the
range of 74.5 through 125.5 (%).
g. When the desired amplification setting appears, press ENTER to return to the
"AN A" display. Then press SETUP to return to the "Setup" display.
ANALOG OFFSET and ANALOG AMPLIFICATION (GAIN) for the Model 3510
Thermocouple Conditioner—
For the 3510, the user should enter for the "ANA-
LOG OFFSET" value the temperature that is to be represented by an analog out-
put value of 0 volts. For the "ANALOG OUTPUT AMPLIFICATION" value, the user
should enter the temperature that is to be represented by an analog output value
of 5 volts.
Suppose, for example, that an ANALOG OFFSET of "0" and an ANALOG OUTPUT
AMPLIFICATION of "500" are entered for the Model 3510. When "0°" is on display
(°C or °F, any TC type, with or without internal cold junction), the analog output will
equal 0 V; when "250°" is on display, it will be 2.5 V; when "500°" is on display, it will
be 5 V; and when "-100°" is on display, it will be -1 V. If, however, an ANALOG OFF-
SET of "200" is entered, and an ANALOG OUTPUT AMPLIFICATION of "400," then
a reading of "200°" will produce an analog output of 0 V; a reading of "400°," 5 V; a
reading of "300°," 2.5 V; a reading of "100°," -2.5 V; and a reading of "0°," -5 V.*
IMPORTANT: YOU MUST NOT ENTER FOR THE MODEL 3510 AN ANALOG
AMPLIFICATION VALUE GREATER THAN 6 TIMES THE DIFFERENCE BETWEEN
THE ANALOG AMPLIFICATION VALUE AND THE ANALOG OFFSET VALUE. THAT
IS,
where "AOG" is the ANALOG AMPLIFICATION value and "AOO" is the ANALOG
OFFSET value. For example, an "AOO" of 2500 and an "AOG" of 2600 are not
allowed, since 2600/100 = 260. An "AOO" of 2500 and an "AOG" of 3500 will work,
however, since 3500/1000 = 3.5 (
≤
6).
3.a.8 L
IMITS
: LIMIT K
EY
By specifying two independent limit setpoints ("HIL" and "LOL"), you define three
distinct LIMIT ZONES (Fig. 18). Your 3500 instrument will continuously monitor
the "live" data reading for its status with respect to these zones. When a "HI" or
"LO" limit violation is detected, the corresponding logic output will be issued and
the corresponding front-panel limit status indicator will light.
3.14
3
S
ETUP
: I
NSTRUMENT
C
ONFIGURATION
3.a C
ONFIGURING
T
HROUGH THE
F
RONT
P
ANEL
* You can even make the ANALOG OFFSET for a Model 3510 greater than the ANALOG OUTPUT
AMPLIFICATION, in order to make the slope of the analog output negative compared to the
input.
AOG
(AOG - AOO)
≤
6