Martel Electronics 3001 - Manual (Page 13)

Item Name Description
1 Display A 2 line, 16 character, display providing all visual user
feedback for the isolated input operations. See section 2.6
for layout details, and section 2.7 for possible error mes-
sages.
2 Function keys
Select DC voltage and current input mode. Subsequent
presses of this key cycle through the ranges: 10V, 100V,
and 50mA.
When using 50mA mode to test a 2 wire loop powered
transmitter that is disconnected from its wiring, press this
key to activate an internal 24V power supply in series with
the current measuring circuit. Press the key again to
deactivate the 24V supply.
When using 50mA mode to test a HART configuration
device, press this key to activate an internal 250 ohm resis-
tor in series. Press the key again to deactivate the resis-
tor.Note that activating this resistor drops the maximum
load driving capability from 1000 ohms at 20mA to 750
ohms at 20mA.
Select Pressure input mode. Subsequent presses of this
key cycle through the pressure units.Pressure input mode
uses the pressure module connector on the primary
input/output side. Both sides may be selected to pressure
mode simultaneously and can be set to display the same
pressure measurement in different units if desired.
3 Input Terminals Common input terminals for DC voltage and current. See
notes 1 and 2 below.
Note 1: These terminal binding posts are made of a special copper alloy to reduce thermal
EMF's. They support the use of either discreet wires or standard banana plugs, and the
HI/LO pairs are spaced for standard dual banana plugs.
Note 2: Caution. Do not exceed a maximum of 100 volts to chassis ground.
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