Practical Instrument Electronics 334Plus - Manual (Page 5)

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
Page 5
2 Wire mA, 2 Wire % (Percent of 4 to 20 mA)
Choose this function to simulate a 2 Wire Transmitter output from 0.000 to 24.000 milliamps.
Operates in loops with power supply voltages from 2 to 100 VDC
Simulate 2-Wire Transmitters
1) Disconnect one or both input
wires from the device to be cali-
brated.
2) Select “mA” or “% 4 to 20mA”
with slide switch q .
3) Select “2 WIRE” using slide
switch w .
4) Connect the red input lead of
the 334Plus to the plus (+) input
of the field connections and the
black lead to the minus (-).
Loop current is adjusted in 0.001 mA
(0.01%) increments by turning the knob
r while the EZ-CHECK™ switch e is in the “DIAL”
position, or the current can be set at the fixed points of 4.000mA (0.00%) or 20.000mA (100.00%)
with switch
e . Press and turn the knob for faster dialing with 0.100 (1.00%) increments.
Start automatic stepping or ramping by pressing and holding the r DIAL KNOB for 3 seconds. The
word STEPPING or RAMPING will flash on the display anytime the selected automatic function is
running. The 334Plus will automatically step or ramp between 4mA & 20mA (or 20mA & 4mA) for 30
seconds then reverse direction. Stop the stepping or ramping by pressing or turning the knob or
moving any switch.
To
Sensor
Typical
2-Wire
Transmitter
(Disconnected)
+ IN - REF +OUT-
Receiver
Powers External
2-Wire Transmitter
Power Supply
(2 to 100 VDC)
2 WIRE
mA
12.002
To change the Automatic Stepping & Ramping settings
Double click the
r DIAL KNOB at any time the unit is on and the following display will appear for 30
seconds:
Turn the
r DIAL KNOB to move through the menu. Press the r DIAL KNOB to toggle between OFF
and ON or to change the steps setting. These settings are remembered even with the power off.
EXIT MENU - exits this menu immediately and saves any changes. Menu will automatically exit after
30 seconds of inactivity.
STEPS - pressing the knob will cycle from 2, 3, 5 steps and RAMP.
2 steps will automatically switch between 4 & 20 mA (0 & 100%).
3 steps between 4, 12 & 20 mA (0, 50 & 100%).
5 steps between 4, 8, 12, 16 & 20 mA (0, 25, 50, 75 & 100%).
RAMP will continuously ramp the output between 4 & 20 mA (0 & 100%).
Setting Up Automatic Stepping & Ramping