Altek Model 934 Milliamp Voltage Loop Calibrator Manual

							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 calibrator to the input
of the 2-Wire Transmitter
The Model 934 supplies a nominal 24 Volts DC at 24 mA
to the 2-Wire transmitter. The current passed by the
transmitter will be accurately displayed by the 934.
Calibrate the Transmitter in the usual manner and disconnect
the Model 934.
T/C
RTD
mA
mV
SENSOR OR
CALIBRATOR
SENSOROUTPUT
2-WIRE
TRANSMITTER
ALTEK 9344.000mA
26
OPERATING INSTRUCTIONS
7) The words AUTO CHEK and
TIME appear on the LCD
prompting you to enter the
number of seconds between
steps. Turn the knob until
the correct number of
seconds per step (from 5 to
900) appears on the LCD.
Press the 
STORE push-
button to continue.
8) Move the QUIK-CHEK
switch to 
SET. Press theSTORE push-button to turn
the AUTO-CHEK on.
The word AUTO-CHEK will
flash while AUTO-CHEK is
active. The ouput pauses at
each step for the number of
seconds selected then
proceeds to the next higher step.
When the top step is reached
(the value stored in the HI
QUIK-CHEK) the AUTO-CHEK
reverses direction and the
output proceeds to the next
lower step. This cycle repeats
continuously until it is
deactivated.
USING AUTO-CHEK
S
E
T
U
PSOURCE
AUTO-CHEK
TIME
SOURCE
AUTO-CHEK mA
AUTO-CHEK
10
8.000
20.000
SOURCE
AUTO-CHEK mA
4.000
SOURCE
mA 
						

							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 adjustable with the
QUIK-CHEK switch in the 
SET position. Zero & Span (or any
other values) are available by using the LO and HI
QUIK-CHEKs.
COMPUTER
RECEIVER
LOGGER
TRANSMITTER
ALTEK 934
10.000V
25
OPERATING INSTRUCTIONS
USING AUTO-CHEK
5) Press the STORE push-
button to select the function.
AUTO-CHEK will appear
on the display along with the
words on or OFF.
Rotate the knob until the
word on appears on the
display. If AUTO-CHEK has
not been enabled the word
AUTO-CHEK will not appear
- see ENABLING RANGES
& FUNCTIONS, page 6.
Press the 
STORE push-
button to continue.
6) The word AUTO CHEK and
% appear on the LCD
prompting you to enter the
percent of span change
between steps. Turn the knob
until  the correct percentage
appears on the LCD. For 2
steps choose 100%, 3 steps
choose 50%, 5 steps choose
25% and for 10 steps choose
10%. Press the 
STOREpush-button to continue.S
E
T
U
P
SOURCE
mA
onAUTO-CHEK
S
E
T
U
PSOURCE
25AUTO-CHEK %
S
E
T
U
PSOURCE
mA
OFFAUTO-CHEK 
						

							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 with
the output of the
isolator of either
250 Ohms or a value
equivalent to the
resistance of the loop.
Check the manual
for your isolator for
specific instructions.
mA
ROCHESTER NY 14623ALTEK 934SOURCE20.000mA
mA/V LOOP CALIBRATOROFF ONHI
SET
LOMAX
READ
MIN
9VDC
AUTO-CHEK HI
MINREAD
SOURCE
STOREQUIK-CHEK ®SETUP
READ
RESETSETUP
500
        MAXSOURCESOURCEREAD
INPUT OUTPUT
20.000mA
24
OPERATING INSTRUCTIONS
USING AUTO-CHEK
Use the AUTO-CHEK to continuously switch the Model
934s output from Zero to Span (stored in the HI and LO QUIK-
CHEKs) in 2, 3, 5 or 10 equal steps at an interval of between
5 and 900 seconds per step. Set your calibrator at one point
in the field and calibrate every device in the loop.
1) Store the required Span &
Zero into the HI & LO QUIK-
CHEK positions (refer to
STORING QUIK-CHEK
OUTPUTS, page 16).
2) Press & hold both push-
buttons (
STORE & RESET)
for 1 second to enter the
SETUP mode. The word
SETUP will appear in theLCD
and the words SOURCE and
READ will flash (shown as
gray).
3) Press the 
STORE push-
button. The words SETUP
and SOURCE will remain on
the LCD and the previously
selected function will flash.
4) Turn the knob (digital pot) to
scroll through the available
functions. Each enabled
function will flash on the LCD.
READ
S
E
T
U
PSOURCE
S
E
T
U
PSOURCE
mA
S
E
T
U
PSOURCE
V 
						

							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 of time
when a large number of voltage receivers, such as chart
recorders or computer systems require calibration.
Output voltage is continuously adjustable with the QUIK-
CHEK switch in the 
SET position. Zero & Span (or any other
values) are available by using the LO and HI QUIK-CHEKs.
The LO & HI “QUIK-CHEK”s are usually set to 1.000 and
5.000 V to quickly calibrate Zero & Span.
Make certain that changing the signal input will not
disturb the process or cause unexpected alarms when checking
on-line instruments. It is important to remember the Model 934
drives 
only the device to which it is connected. It has no
effect on other devices in the 4 to 20 mA loop. The Model 934
will clamp the selected value in the mV and V Ranges to
the maximum sink current of >16 mA.
23
OPERATING INSTRUCTIONS
V, V ENG. UNIT
mV, mV ENG. UNIT
Choose this function to calibrate any 1 to 5 Volt device in
a 4 to 20 mA loop without breaking the loop or turning off
the signal current.
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 SOURCE lead
to the minus (-). Any associated 250 Ohm resistor must
not be disconnected. 
						

							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 of time
when a large number of voltage receivers, such as chart
recorders or computer systems require calibration.
Output voltage is continuously adjustable with the QUIK-
CHEK switch in the 
SET position. Zero & Span (or any other
values) are available by using the LO and HI QUIK-CHEKs.
The LO & HI “QUIK-CHEK”s are usually set to 1.000 and
5.000 V to quickly calibrate Zero & Span.
Make certain that changing the signal input will not
disturb the process or cause unexpected alarms when checking
on-line instruments. It is important to remember the Model 934
drives 
only the device to which it is connected. It has no
effect on other devices in the 4 to 20 mA loop. The Model 934
will clamp the selected value in the mV and V Ranges to
the maximum sink current of >16 mA.
23
OPERATING INSTRUCTIONS
V, V ENG. UNIT
mV, mV ENG. UNIT
Choose this function to calibrate any 1 to 5 Volt device in
a 4 to 20 mA loop without breaking the loop or turning off
the signal current.
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 SOURCE lead
to the minus (-). Any associated 250 Ohm resistor must
not be disconnected. 
						

							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 with
the output of the
isolator of either
250 Ohms or a value
equivalent to the
resistance of the loop.
Check the manual
for your isolator for
specific instructions.
mA
ROCHESTER NY 14623ALTEK 934SOURCE20.000mA
mA/V LOOP CALIBRATOROFF ONHI
SET
LOMAX
READ
MIN
9VDC
AUTO-CHEK HI
MINREAD
SOURCE
STOREQUIK-CHEK ®SETUP
READ
RESETSETUP
500
        MAXSOURCESOURCEREAD
INPUT OUTPUT
20.000mA
24
OPERATING INSTRUCTIONS
USING AUTO-CHEK
Use the AUTO-CHEK to continuously switch the Model
934s output from Zero to Span (stored in the HI and LO QUIK-
CHEKs) in 2, 3, 5 or 10 equal steps at an interval of between
5 and 900 seconds per step. Set your calibrator at one point
in the field and calibrate every device in the loop.
1) Store the required Span &
Zero into the HI & LO QUIK-
CHEK positions (refer to
STORING QUIK-CHEK
OUTPUTS, page 16).
2) Press & hold both push-
buttons (
STORE & RESET)
for 1 second to enter the
SETUP mode. The word
SETUP will appear in theLCD
and the words SOURCE and
READ will flash (shown as
gray).
3) Press the 
STORE push-
button. The words SETUP
and SOURCE will remain on
the LCD and the previously
selected function will flash.
4) Turn the knob (digital pot) to
scroll through the available
functions. Each enabled
function will flash on the LCD.
READ
S
E
T
U
PSOURCE
S
E
T
U
PSOURCE
mA
S
E
T
U
PSOURCE
V 
						

							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 adjustable with the
QUIK-CHEK switch in the 
SET position. Zero & Span (or any
other values) are available by using the LO and HI
QUIK-CHEKs.
COMPUTER
RECEIVER
LOGGER
TRANSMITTER
ALTEK 934
10.000V
25
OPERATING INSTRUCTIONS
USING AUTO-CHEK
5) Press the STORE push-
button to select the function.
AUTO-CHEK will appear
on the display along with the
words on or OFF.
Rotate the knob until the
word on appears on the
display. If AUTO-CHEK has
not been enabled the word
AUTO-CHEK will not appear
- see ENABLING RANGES
& FUNCTIONS, page 6.
Press the 
STORE push-
button to continue.
6) The word AUTO CHEK and
% appear on the LCD
prompting you to enter the
percent of span change
between steps. Turn the knob
until  the correct percentage
appears on the LCD. For 2
steps choose 100%, 3 steps
choose 50%, 5 steps choose
25% and for 10 steps choose
10%. Press the 
STOREpush-button to continue.S
E
T
U
P
SOURCE
mA
onAUTO-CHEK
S
E
T
U
PSOURCE
25AUTO-CHEK %
S
E
T
U
PSOURCE
mA
OFFAUTO-CHEK 
						

							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 calibrator to the input
of the 2-Wire Transmitter
The Model 934 supplies a nominal 24 Volts DC at 24 mA
to the 2-Wire transmitter. The current passed by the
transmitter will be accurately displayed by the 934.
Calibrate the Transmitter in the usual manner and disconnect
the Model 934.
T/C
RTD
mA
mV
SENSOR OR
CALIBRATOR
SENSOROUTPUT
2-WIRE
TRANSMITTER
ALTEK 9344.000mA
26
OPERATING INSTRUCTIONS
7) The words AUTO CHEK and
TIME appear on the LCD
prompting you to enter the
number of seconds between
steps. Turn the knob until
the correct number of
seconds per step (from 5 to
900) appears on the LCD.
Press the 
STORE push-
button to continue.
8) Move the QUIK-CHEK
switch to 
SET. Press theSTORE push-button to turn
the AUTO-CHEK on.
The word AUTO-CHEK will
flash while AUTO-CHEK is
active. The ouput pauses at
each step for the number of
seconds selected then
proceeds to the next higher step.
When the top step is reached
(the value stored in the HI
QUIK-CHEK) the AUTO-CHEK
reverses direction and the
output proceeds to the next
lower step. This cycle repeats
continuously until it is
deactivated.
USING AUTO-CHEK
S
E
T
U
PSOURCE
AUTO-CHEK
TIME
SOURCE
AUTO-CHEK mA
AUTO-CHEK
10
8.000
20.000
SOURCE
AUTO-CHEK mA
4.000
SOURCE
mA 
						

							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 2-Wire Transmitter is continuously
adjustable from 3.000 to 24.000 mA with the QUIK-CHEK
switch in the 
SET position. Zero & Span (or any other values)
are available by using the LO and HI QUIK-CHEKs.
RECEIVER
(Powers External
2-Wire Transmitters)
POWER
SUPPLY
2 to
100 VDCZEROSENSORSPAN
2-WIRE TRANSMITTER
(Disconnected)
ALTEK 934
100.00%
27
OPERATING INSTRUCTIONS
USING AUTO-CHEK
You can deactivate the
AUTO-CHEK function at any
time by pressing the 
STOREpush-button  while the QUIK-
CHEK switch is at SET or by
moving the QUIK-CHEK switch
to 
HI or LO. AUTO-CHEK will
stop flashing to indicate that it
is deactivated. 
SET will indicate
the the most recent step value.
While AUTO-CHEK is
deactivated the QUIK-CHEK
values stored in 
HI and LO can
be recalled to adjust the Span
and Zero of the device being
calibrated. Or store new values
by switching to 
HI and LO,
turning the digital pot and
pressing the 
STOREpushbutton.
To reactivate AUTO-CHEK
press the 
STORE push-button
while the QUIK-CHEK switch is
at 
SET. When AUTO-CHEK is
reactivated it restarts the cycle
from the lowest output (stored
in the 
LO QUIK-CHEK).
SOURCE
AUTO-CHEK mA
24.000
HISOURCE
AUTO-CHEK mA
20.000
HI
SOURCE
AUTO-CHEK mA
4.000 
						

							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 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 SOURCE lead
to the minus (-)
Output current is continuously adjustable with the QUIK-
CHEK switch in the 
SET position. Zero & Span (or any other
values) are available by using the LO and HI QUIK-CHEKs.
28
OPERATING INSTRUCTIONS
READ MODE
READ
1) Move the POWER switch to ON
2) Press & hold both the STORE & RESET push-buttons for
1 second to enter the SETUP mode. The word SETUP
will appear in the LCD and the words SOURCE and READ
will alternately flash. Release both push-buttons.
3) Press the 
RESET push-button. The words SETUP and
READ will remain on the LCD and the previously selected
function will flash.
4) Turn the knob (Digital pot) to scroll through the available
functions. Each enabled function will flash on the LCD
(See ENABLING RANGES & FUNCTIONS under
OPERATING INSTRUCTIONS, GENERAL).
3) Press the 
RESET push-button to select the function.  If OFF
is selected the READ function will be deactivated and the
bottom half of the LCD will be blank.
4) Connect the Model 934 to the input terminals of the
instrument or meter to be calibrated.
5) Display the present reading, Maximum or Minimum
Whenever READ is selected the word READ will appear on
the LCD display.  The display will update the present reading
twice per second.