Hanna Instruments HI 931002 - Manual (Page 4)

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PASSIVE MEASURING (TESTER) MODE
This mode is intended to test an active transmitter. The HI 931002
reads the current produced by the transmitter via the 4-20 mA bus
and displays the reading in mA or pH units.
• Disconnect the external power adapter from HI 931002 if present.
• Turn the meter on by pressing the ON/OFF key.
• Select the measurement unit by pressing the UNIT key.
• Switch the selection switch to the "Measure"
mode.
• Wire the calibrator "Com." and "P" connectors to the Device Under
Test (D.U.T.) input contacts (see page 4, #10 and #9 respec-
tively) using the cables provided, paying attention to the polarity
("Com." to - and "P" to + terminals).
• Verify that the D.U.T. displays the same reading of the HI 931002
and calibrate the D.U.T. according to manufacturer instructions if
necessary.
IMPORTANT NOTE:
Set the selection switch to MEASURE mode only if the
D.U.T. is a transmitter and can limit current below 100mA.
WRONG OPERATION WILL BREAK THE INTERNAL FUSE.
ACTIVE DRIVE (SIMULATOR) MODE
This mode is intended to drive a chart recorder, calibrate a pressure/
current transducer or a current indicator. The HI 931002 supplies a
voltage to the 4-20 mA bus via an external connected 12-32 VDC
power supply. The calibrator regulates the current, displayed on the
LCD, as in the previous mode (Passive Drive).
• Turn the meter on by pressing the ON/OFF key.
• Select the measurement unit by pressing the UNIT key.
• Switch the selection switch to the "Drive" mode.
• Connect the external power adapter to the power
socket on the right side of the HI 931002.
• Wire the calibrator "Com." and "A" connectors to the Device Under
Test (D.U.T.) input contacts (see page 4, #10 and #8 respec-
tively) using the cables provided, paying attention to the polarity
("Com." to - and "A" to + terminals).
• Turn the Fine and Coarse knobs to any desired value and make
sure that the D.U.T. reflects the current value displayed on the HI
931002 LCD.
• Calibrate the D.U.T. according to manufacturer instructions if necessary.
Note: the battery powers on the display only. Calibrator operational
mode is functional even without a battery or if battery is
discharged.