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Practical Instrument Electronics
82 East Main Street Suite 3.14 • Webster, NY 14580 Tel: 585.872.9350 • Fax: 585.872.2638 • [email protected] • www.piecal.com
AUTO OFF
- If
AUTO OFF
is
ON
, the unit will
turn off after 30 minutes of inactivity to save
battery life. If
AUTO OFF
is
OFF
the unit will
stay on until the POWER SWITCH is moved to
the off position.
BACKLIGHT
- If
BACKLIGHT
is
ON
the
backlight will light all the time the unit is powered
up. For maximum battery life turn the backlight
off when using the calibrator in areas with
enough ambient light to read the display.
STEPS/RAMP
- pressing the knob will cycle
through
2, 3, 5, 11
and
RAMP
. The endpoints
of the steps or ramp are based on the values
stored in the
HI
and
LO
EZ-CHECK outputs.
2
steps
will automatically switch between the
values stored in the HI & LO EZ-CHECK (0 &
100%).
3
steps
between the HI, Midpoint and LO
EZ-CHECK (0, 50 & 100%).
5
steps
between the HI and LO EZ-CHECK
in 25% increments (0, 25, 50, 75 & 100%).
11
steps
between the HI and LO EZ-CHECK
in 10% increments (0, 10, 20...80, 90 &100%).
RAMP
continuously ramps up and down
between the HI and LO EZ-CHECK outputs.
STEP/RAMP TIME
- pressing the knob will
cycle through
5, 6, 7, 8, 9, 10, 15, 20, 25,
30
and
60
seconds.
FEATURES
> EXIT (4/4)
AUTO OFF
ON
OFF
BACKLIGHT
ON
OFF
STEPS/RAMP 2
3 5 11 RAMP
STEP/RAMP TIME 5
6 7 8 9 10 15 20 25 30 60
Double Click Menu - FEATURES
Double Click Menu - mA DISPLAY
MODE
- pressing the knob will cycle through
READ
,
PWRM
,
READ%
,
PWRM%
and
OFF
.
READ
turns on the mA display and indicates
current passing through the loop proportional
to the input of the transmitter which is controlled
by the output of the 311Plus. Choose
READ%
to display in percent of 4-20 milliamps.
PWRM
is POWER MEASURE which uses the
internal loop supply of the 311Plus to power up
the transmitter while indicating the current
passing through the loop proportional to the
input of transmitter which is controlled by the
output of the 311Plus. Choose
PWRM%
to
display in percent of 4-20 milliamps.
If
PWRM
or
PWRM%
is selected an
additional menu selection of
LEAK DETECT
will appear. When
LEAK DETECT
is turned
on the 311Plus will display
LEAK
and the
amount of current that is uncontrolled in the
loop. This may be due to a faulty transmitter,
corrosion causing a bridge to ground or
moisture present at some connection point.
When
LEAK DETECT
tests a loop with
leakage the loop mA signal will be affected.
HART 250
Ω
- turn on the 250
Ω
resistor if you
are powering up a HART transmitter. This
provides the loop load required for HART
communication.
mA DISPLAY (For RTD)
> EXIT (3/4)
MODE OFF
READ PWRM READ% PWRM%
HART 250
Ω
ON
OFF
LEAK DETECT OFF
ON
Configuration