Altek Model 934 Milliamp Voltage Loop Calibrator Manual
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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.