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Model
DRC-93C
Section III
These are displayed as
0 . 1
to
99
3.11
HEATER POWER
which means that the displayed num-
ber is multiplied by ten to get the
rate in seconds.
For a discussion
of beats per second and time con-
The Bar Graph displays the magnitude
stants, see the Application Note
of the heater power in percent of
enclosed as an Appendix to this
full scale.
Full
scale is defined
manual.
as the product of the maximum heater
current of one ampere squared times
To change the Rate, press the RATE
the heater
resistance times the
key and use methods 1,
2,
and/or
3
range setting. The DRC-93C Tempera-
described above.
ture Controller is shipped from the
factory with the Bar Graph indica-
3.10.4
RESET
ting power. If the user prefers, he
can change this to a current reading
Adjusts reset (integral) time con-
by turning on switch
1
of the eight
stant of integrator.
Effectively
station dip switch located at the
sets time constant between
1
second
rear center of the main board.
and
990
seconds.
These are dis-
played as 0.1to
99.
3 . 1 1 . 2
The
HEATER POWER
RANGE
To change the
RESET,
press the RESET
The heater power range setting is
key and use methods 1,
2,
and/or
3
determined
by
the keys directly
described above.
below the HEATER POWER Bar Graph.
MAX corresponds to a
10 0
or
1
mult-
iplier, while -1,
-2,
-3
and
3 . 1 0 . 5
MANUAL
HEATER POWER
-4
corresponds to a 10 -1
10 -2
10 -3
and
10 -4
multiplier respectively.
The DRC-93C provides a feature in
The OFF key turns off the output
which the heater power can be set
power independent of the setpoint
manually.
The Manual Heater Power
and the control parameters.
value is indicated on the Bar Graph
by a blinking segment at the percent
NOTE:
The DRC-93C is equipped with
at which it is set.
a current limit vernier on the rear
panel which can limit the output
To change the Manual Heater Power,
current on the MAX scale between
press the
MANUAL
HEATER key and use
0.33
and
1
ampere, dependent on
methods 1,
2,
and/or
3
described
setting. If the instrument will not
above. If the decimal number
5
is
deliver full power, this vernier may
entered, the Bar Graph will blink
be set wrong or the load resistance
the segment at
5%.
If a zero is
may be too large and the unit is
entered
immediately
after the
5
compliance voltage limited.
(thus entering
50)
the Bar Graph
will blink the segment at
50%.
The
NOTE:
I f
a
SETPOINT,
GAIN, RATE,
CLEAR
key cancels anything entered
RESET,
MANUAL HEATER
POWER
or HEATER
and returns the instrument to normal
POWER
RANGE
is entered too quickly,
operation.
The ENTER key inserts
the Unit may
not update the para-
the new Manual Heater Power and then
meter
properly.
T h e
instrument
returns to normal operation.
Display
and
MAIN Boards verify
entered
parameters
each
update
cycle.
changing
a parameter more
than once
in
an update
cycle m a y
result in inconsistant parameters
being entered.
3 . 1 1 . 1
HEATER %.
COPYRIGHT
3/88
3
-17
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