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Altek Model 934 Milliamp Voltage Loop Calibrator Manual

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Page 21

19
OPERATING INSTRUCTIONS
POWER & MEASURE 2-WIRE TRANSMITTERS
PWR XMTR mA, PWR XMTR %, PWR XMTR ENG. UNIT,
PWR XMTR, % DP FLOW
Choose this function to simultaneously supply power to a
2-Wire transmitter while displaying the 4-20 mA output of
the transmitter.
1) Disconnect one or both input wires from the 2-Wire
Transmitter to be calibrated
2) Connect the red 
SOURCE lead of the calibrator to the
plus (+) input of the device and the black SOURCE lead
to the minus (-)
3) Connect an appropriate sensor or...

Page 22

20
OPERATING INSTRUCTIONS
CALIBRATE VOLTAGE INPUTS
V, V ENG. UNIT
mV, mV ENG. UNIT
Choose this function to provide an output from 0.00 mV
to 999.90 mV and from 0.000 to 20.000 VDC. Source current
is a nominal 25 mA to provide the driving power to your
voltage receivers.
1) Disconnect one or both input wires from the device to be
calibrated
2) Connect the red 
SOURCE lead of the calibrator to the
plus (+) input of the device and the black SOURCElead to the minus (-)
Output voltage is continuously...

Page 23

21
OPERATING INSTRUCTIONS
CALIBRATING LOOP
CONVERTERS & I/I ISOLATORS
Calibrate your 4-20 milliamp and voltage loop converters
and I/I isolators without any additional test equipment or
power supplies.
1) Setup the Model 934 to select both the correct SOURCE
and READ functions and ranges to match the instrument
being calibrated.
2) Connect the Model 934 SOURCE and READ leads
to the input and output connections of the instrument
being calibrated
Some loop isolators
require a resistor
placed in series...

Page 24

CONTROLLER
(TYPICAL)
TRANSMITTER
4-20mA
ADDITIONAL
4-20 mA OR 1-5V
INSTRUMENTSRECORDER
COMPUTER
LOGGER
ETC,
1-5V DC250Ω
ALTEK 934
5.000V
22
OPERATING INSTRUCTIONS
CHECK 1-5 VOLT INPUTS WITHOUT
DISCONNECTING WIRES
Most 1-5 Volt receivers in 4-20mA loops have a 250 Ohm
resistor across the input of the receiver. This resistor may be
mounted internally or externally. The Model 934 is connected
directly across the input of the 1-5 Volt receiver without
disconnecting any field wiring. This saves a great deal...

Page 25

CONTROLLER
(TYPICAL)
TRANSMITTER
4-20mA
ADDITIONAL
4-20 mA OR 1-5V
INSTRUMENTSRECORDER
COMPUTER
LOGGER
ETC,
1-5V DC250Ω
ALTEK 934
5.000V
22
OPERATING INSTRUCTIONS
CHECK 1-5 VOLT INPUTS WITHOUT
DISCONNECTING WIRES
Most 1-5 Volt receivers in 4-20mA loops have a 250 Ohm
resistor across the input of the receiver. This resistor may be
mounted internally or externally. The Model 934 is connected
directly across the input of the 1-5 Volt receiver without
disconnecting any field wiring. This saves a great deal...

Page 26

21
OPERATING INSTRUCTIONS
CALIBRATING LOOP
CONVERTERS & I/I ISOLATORS
Calibrate your 4-20 milliamp and voltage loop converters
and I/I isolators without any additional test equipment or
power supplies.
1) Setup the Model 934 to select both the correct SOURCE
and READ functions and ranges to match the instrument
being calibrated.
2) Connect the Model 934 SOURCE and READ leads
to the input and output connections of the instrument
being calibrated
Some loop isolators
require a resistor
placed in series...

Page 27

20
OPERATING INSTRUCTIONS
CALIBRATE VOLTAGE INPUTS
V, V ENG. UNIT
mV, mV ENG. UNIT
Choose this function to provide an output from 0.00 mV
to 999.90 mV and from 0.000 to 20.000 VDC. Source current
is a nominal 25 mA to provide the driving power to your
voltage receivers.
1) Disconnect one or both input wires from the device to be
calibrated
2) Connect the red 
SOURCE lead of the calibrator to the
plus (+) input of the device and the black SOURCElead to the minus (-)
Output voltage is continuously...

Page 28

19
OPERATING INSTRUCTIONS
POWER & MEASURE 2-WIRE TRANSMITTERS
PWR XMTR mA, PWR XMTR %, PWR XMTR ENG. UNIT,
PWR XMTR, % DP FLOW
Choose this function to simultaneously supply power to a
2-Wire transmitter while displaying the 4-20 mA output of
the transmitter.
1) Disconnect one or both input wires from the 2-Wire
Transmitter to be calibrated
2) Connect the red 
SOURCE lead of the calibrator to the
plus (+) input of the device and the black SOURCE lead
to the minus (-)
3) Connect an appropriate sensor or...

Page 29

18
OPERATING INSTRUCTIONS
SIMULATE 2-WIRE TRANSMITTERS
2-WIRE SIM mA, 2-WIRE SIM %, 2-WIRE SIM ENG. UNIT,
2-WIRE SIM % DP FLOW
Choose this function to simulate a 2-Wire Transmitter output
from 3.000 to 24.000 milliamps. Operates in loops with power
supply voltages from 2 to 45 VDC.
1) Disconnect existing 2-Wire Transmitter from the loop
2) Connect the red 
SOURCE lead of the calibrator to the
plus (+) input of the field connections and the black
SOURCE lead to the minus (-)
The simulated output of the...

Page 30

17
ALTEK 934
20.000mA
VA LV E
OR
RECEIVER I/P
OPERATING INSTRUCTIONS
SOURCE FUNCTIONS
The SOURCE functions generate or control the desired
signal. Multiple scales are available for each function.
Engineering Units & % DP Flow must be enabled before they
are available for selection.
CALIBRATE MILLIAMP INPUTS
mA, mA %, mA ENG. UNIT, mA % DP FLOW
Choose this function to provide an output from 0.000 to
24.000 milliamps. The compliance voltage is a nominal 24 VDC
to provide the driving power to your milliamp...
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