Altek Process Calibrator TechChek 820 Manual
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1 GENERAL INFORMATION Lighten your load by taking the TechChek to every site. It’s like bringing a cartload of test equipment from the shop to the control room or the field. The TechChek 820 sources & reads DC like a milliamp or voltage calibrator, simulates and measures T/Cs & RTDs like a temperature calibrator and generates and counts frequency & Counts-Per-Minute like a frequency calibrator. Your TechChek can also help you trouble shoot like a multimeter! It checks continuity and measures AC line voltage without carrying a seperate instrument. The TechChek 820 is easy to use. Select a function, choose a range, and turn the knob for the precise output you need. Plus, you can store three output values per range for instant recall with the QUIK-CHEK® switch. MILLIAMP CALIBRATION Use at every point in your 4 to 20 mA loop. You can Source & Read 0.00 to 24.00 mA, Simulate a Two-Wire Transmitter or the use the TechChek 820 to simultaneously Power & Measure your Two-Wire Transmitters. VOLTAGE CALIBRATION Calibrate all your DC millivolt and voltage instrumentation.Source from 0.00 to 110.00 mV and 0.00 to 10.25 V. Read up to 110.00 mV, 11.00 V and 200.0 VDC. THERMOCOUPLE CALIBRATION Source and read directly in °C and °F for T/C types J, K, T & E with 1° resolution. Cold junction compensation automatically adjusts for ambient temperature changes. RTD CALIBRATION Built-in Platinum 100 Ohm DIN/IEC 751 table displays in °C or °F. No more decade box and hard-to-read tables. Also reads and sources in Ohms. GENERAL OPERATING INSTRUCTIONS...........................3 TURN ON .........................................................................3 CONNECTIONS ...............................................................3 TILT STAND......................................................................4 CHANGING BATTERIES..................................................4 RESTORING DEFAULT SETTINGS ................................5 CONFIGURING TEMPERATURE SCALES ...............5 ENABLING AUTO-OFF ..............................................5 SELECTING RANGES .....................................................6 SOURCE MODE OPERATING INSTRUCTIONS.................7 STORING & RECALLING QUIK-CHEK ®OUTPUTS .......7 SOURCE MODE CONNECTION INSTRUCTIONS CALIBRATE MILLIAMP INPUTS ................................8 SIMULATE 2-WIRE TRANSMITTERS .......................9 POWER & MEASURE 2-WIRE TRANSMITTERS ...10 CALIBRATE VOLTAGE INPUTS...............................11 CHECK 1-5 VOLT INPUTS WITHOUT DISCONNECTING WIRES .......................................12 CALIBRATE THERMOCOUPLE INPUTS ................13 CALIBRATE RESISTANCE INPUTS ........................14 CALIBRATE RTD INPUTS .......................................15 CALIBRATE FREQUENCY INPUTS ........................16 READ MODE OPERATING INSTRUCTIONS....................17 MIN/MAX ..................................................................17 OUT OF RANGE SIGNALS......................................17 READ MODE CONNECTION INSTRUCTIONS READ MILLIAMP OUTPUTS ....................................18 READ VOLTAGE OUTPUTS ....................................19 MEASURE THERMOCOUPLE SENSORS ..............20 READ RESISTANCE ................................................21 CHECK CONTINUITY ..............................................22 MEASURE RTD SENSORS .....................................23 COUNT FREQUENCIES ..........................................24 READ AC VOLTAGES ..............................................25 SPECIFICATIONS...............................................................26 WARRANTY........................................................................30 CONTENTS
23 OPERATING INSTRUCTIONS GENERAL TURN-ON Each time you turn on the TechChek 820 the LCD will display all segments for about 1 second. It then displays the most recent- ly selected Source or Read Setting. SOURCE - The three QUIK-CHEK outputs will be the same as previously stored. Each time a different function is selected, the three QUIK-CHEK outputs will be recalled. READ - The 820 is ready to measure the same signal as the last time it was turned on and is automatically updating the MAX & MIN readings for recall at any time. CONNECTIONS TechChek 820 has protected banana jacks compatible with standard and safety banana plugs. Included with your TechChek are:a pair of safety test leads with test probes, safety alligator clips standard alligator clips and spade lugs for attachment to a wide variety of instruments. An additional safety test lead and spade lug are also included for 3-Wire RTD connections. Thermocouple connections are made through a miniature thermocouple socket. Optional KIT-1 includes T/C wires for Type J, T, E & K with miniature T/C plugs (not included). To prevent accidently overloading the instrument being tested, it is important to correctly set up the outputs before connecting TechChek 820 to any instruments to be calibrated. !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT !300V MAX INPUT 45V MAX INPUT!T/C GENERAL INFORMATION FREQUENCY CALIBRATION Generate Zero Crossing square waves from 1 to 1000 Hz, 0.01 to 10.00 kHz and from 1 to 1000 CPM (Counts-Per-Minute). Also measures as a frequency counter. MEASURE AC VOLTAGE Check your line voltage or mains from 0.0 to 250.0 volts AC. Great for troubleshooting power problems. CHECK CONTINUITY Locate pairs of wire, open connections and shorts with the built-in beeper. TECHNICIAN’S LEAD KIT Included with the TechChek 820 is a test lead kit which consists of three safety test leads with alligator clips, test probes and spade lugs. Rear Label - Condensed Operation Guide SOURCE & READ T/C TERMINALS FUNCTION– + SOURCE 3-Wire RTD1– 4–2+ READ 3-Wire RTD1+ 2–3– READ Freq & VAC to 250V, VDC to 200V4– 5+ READ mA, mVDC, Freq & VDC to 10.25V SIMULATE 2-Wire Transmitters4– 3+ SOURCE mA, mV, V, Ω, 2-Wire RTD, Freq PWR/MEAS mA READ Ω CONTINUITY1– 2+ !See manual for details.
GENERAL CONFIGURING TEMPERATURE SCALES The thermocouple and RTD ranges may be configured for full time use of °C, full time use of °F or selectable °C and °F operation. This configuration is part of the DEFAULT SETTINGS below. AUTO-OFF TechChek 820 can be set up to turn itself off after 30 minutes of inactivity. The internal timer is reset to 30 minutes each time the digital pot is turned or a pushbutton is pressed. DEFAULT SETTINGS TechChek 820 may be restored to the factory default setting. This will reset the HI and LO “QUIK-CHEK” memories according to the table below and the SET memory to midrange between HI and LO. OPERATING INSTRUCTIONS 1) Press and hold the STORE/RESET push-button while turning the 820 on. 2) Keep pressing the push-button until the display flashes (about 5 seconds) then release. 3) The °C & °F symbols will flash on the display. 4) Press the RANGE/TYPE push-button to make your selection. With °C flashing the unit will only display in °C, With °F flash- ing the unit will only display in °F and with both flashing you can select °C and °F for each T/C & RTD type. °C/°F is selected if no push-buttons are pressed. 5) After five seconds the 820 will automatically store your choice and the words BAT and ON will appear on the display indicat- ing that AUTO-OFF is selected. 6) To toggle the AUTO-OFF function on and off press the RANGE/TYPE push-button and the words oN and oFF will display. 7) After five seconds the 820 will automatically store your choice. 8) All segments on the LCD will remain displayed until the 820 has been reset. 4 OPERATING INSTRUCTIONS GENERAL FIELD & BENCH USE TechChek 820 comes with a carrying case and a built-in tilt stand/hanger. The 820 is held securely in the case by VELCRO® for use with the carrying case open. The carry- ing case also has a snap-on belt loop which can be looped around a pipe or rail. The tilt stand is easily raised by pulling the stand until it locks into place. The stand can also be reversed for use as a hanger to suspend the 820. AUTOCAL To maintain accuracy the TechChek period- ically recalibrates its measuring circuitry against internal references. While this is occuring the word CAL will appear on the display for less than 2 seconds. CHANGING BATTERIES Low battery is indicated by BAT on the display. Approximately four hours of opera- tion remain before the LCD blanks and TechChek 820 shuts itself down. Turn the 820 off, loosen the captive screw securing the battery compartment and lift off the cover from the bottom of the case. The six “AA” batteries are easily removed and replaced (alkaline supplied and recom- mended). Replace the battery compartment cover by inserting the tabs and tightening the screw. 5 QUIK-CHEKDEFAULTSRANGE LO SET HI mA 4.00 12.00 20.00 mV 1.00 5.00 10.00 V 1.00 5.00 10.00 T/C All points 0°C/32°F Ohms 100.0 200.0 400.0 RTD All points 0°C/32°F kHz 1.00 5.00 10.00 Hz 100 500 1000 CPM 100 500 1000 CAL
7 SOURCE MODE Select source by pressing the SOURCE/READ pushbutton until the word SOURCE appears on the LCD display. To change the output value, turn the speed sensitive digital pot. Turning the knob slowly will cause a gradual change in the output. A faster rate of change will occur when the knob is turned faster. This function operates in all three output positions (HI, SET & LO). STORING QUIK-CHEK OUTPUTS 1) Switch to HI or LO 2) Turn the knob to desired value 3) Press the STORE push-button The LCD will flash once to show that the value was saved If a value is in the SET position and you want that value stored in HI or LO, press and hold the STORE push-button while moving the switch to HI or LO. The display will flash once to indicate the value has been stored. Then release the STORE push-button. RECALLING QUIK-CHEK OUTPUTS When you need a stored value just flip the QUIK-CHEK switch. Any value for the selected range may be stored in HI & LO. The TechChek 820 remembers the HI, LO and SET values for each function with the power on or off. Each time a different function is selected, the last three QUIK- CHEK values for that function will be recalled. OPERATING INSTRUCTIONS 6 OPERATING INSTRUCTIONS GENERAL SELECTING RANGES Press the RANGE/TYPE pushbutton to select the desired range and scale. SOURCE RANGES Milliamp: mA, %mA, 2-Wire Sim, %2-Wire Sim, Pwr Xmtr, %Pwr Xmtr VDC: mV, V T/C: J°F, J°C, T°F, T°C, E°F, E°C, K°F, K°C Ohms: Ohms RTD: Pt °F, Pt °C Frequency: KHz, Hz, CPM READ RANGES Milliamp: mA, %mA VDC: mV, 10V, 200V T/C: J°F, J°C, T°F, T°C, E°F, E°C, K°F, K°C Ohms: Ohms, Continuity RTD: Pt °F, Pt °C Frequency: KHz, Hz, CPM VAC: VAC TURN OFF Press the POWER push-button to turn the 820 off. If AUTO-OFF is enabled the 820 will turn itself off after 30 minutes of inactiv- ity. RANGE/TYPE POWER STORE/RESET HI SET LO SOURCE
9 OPERATING INSTRUCTIONS SIMULATE 2-WIRE TRANSMITTERS 2-WIRE SIM mA, 2-WIRE SIM % (Percent of 4 to 20 mA) Choose this function to simulate a 2-Wire Transmitter output from 1.00 to 24.00 milliamps. Operates in loops with power supply voltages from 3 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 (-) 3) Repeatedly press the RANGE/TYPE push-button until the words SOURCE, 2-WIRE SIM and mA or SOURCE, 2-WIRE SIM and % are displayed. The simulated output of the 2-Wire Transmitter is continuously adjustable from 1.00 to 24.00 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. !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/C +IN- REF +OUT- RED BLACK Power Supply 2 to 45 VDC Receiver (Powers external 2-Wire Transmitter) To Sensor Typical 2-Wire Transmitter (Disconnected) 8 CALIBRATE MILLIAMP INPUTS mA, mA % (Percent of 4 to 20 mA) Choose this function to provide an output from 0.00 to 24.00 milliamps. The compliance voltage is a nominal 25 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 (-). 3) Repeatedly press the RANGE/TYPE push-button until the word SOURCE and mA or SOURCE and % are displayed. 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. OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CMilliamp Receiver Input Controller Transmitter Computer Logger I/P DCS RED BLACK
11 CALIBRATE VOLTAGE INPUTS V, m V Choose this function to provide an output from 0.00 mV to 110.00 mV and from 0.00 to 10.25 VDC. Source current is a nominal 20 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 SOURCE lead to the minus (-) 3) Press the RANGE/TYPE push-button to switch the display between mV and V. 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. OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CVoltage Receiver Input Controller Transmitter Computer Logger DCSRED BLACK 10 OPERATING INSTRUCTIONS POWER & MEASURE 2-WIRE TRANSMITTERS PWR XMTR mA, PWR XMTR % 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 3) Repeatedly press the RANGE/TYPE push-button until the words SOURCE, PWR XMTR and mA or SOURCE, PWR XMTR and % are displayed. TechChek 820 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 820. Calibrate the Transmitter in the usual manner and disconnect the 820. +IN- REF +OUT- !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CRED BLACK Transmitter Input Sensor Process Signal Simulated InputTypical 2-Wire Transmitter
13 CALIBRATE THERMOCOUPLE INPUTS Choose this function to simulate a thermocouple signal into any instrument requiring a thermocouple input. The output of the 820 is automatically cold junction compensated. 1) Disconnect the thermocouple from the instrument being calibrated. 2) Press the RANGE/TYPE push-button until the desired T/C type and temperature scale appear. 3) Use a thermocouple wire and corresponding miniature thermo- couple connector to connect the TechChek 820 to the instru- ment. Output temperature 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 OPERATING INSTRUCTIONS !! T/C 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!+- Instrument withThermocouple Input Controller Temperature Indicator Temperature Trip or Alarm Temperature Transmitter 12 CHECK 1-5 VOLT INPUTSWITHOUT DISCONNECTING WIRES Most 1-5 Volt receivers in 4-20mA loops have a 250 Ohm resis- tor across the input of the receiver. This resistor may be mounted internally or externally. TechChek 820 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. 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 820 drives only the device to which it is connected.It has no effect on other devices in the 4 to 20 mA loop. TechChek 820 will clamp the selected value in the mV and V Ranges to the maximum sink current of >16 mA. 1) Connect the red SOURCE lead of the calibrator to the plus (+) input of the device and the black SOURCE lead to the minus (-). OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CRED BLACK CONTROLLER (TYPICAL) ADDITIONAL 4-20 mA OR 1-5V INSTRUMENTS RECORDER COMPUTER LOGGER ETC, 1-5V DC 250Ω +IN- REF +OUT- Typical 2-Wire Transmitter
15 CALIBRATE RTD INPUTS Choose this function to simulate a temperature signal into any instrument requiring an RTD input. 1) Disconnect the sensing RTD from the instrument being calibrated. 2) Press the RANGE/TYPE push-button until the desired RTD type and temperature scale appear. 3) Connect using 3 or 2 wires as in the diagrams below. Spade lugs are recommended to minimize any contact resistance. Output temperature 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-CHEK” positions. OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CRED BLACKBLACK Instrument withRTD Input Controller Temperature Transmitter Temperature Indicator Temperature Trip or Alarm !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CRED BLACK Receiver InputOhms or 2-Wire RTD Controller Transmitter Computer 14 CALIBRATE RESISTANCE INPUTS Choose this function to simulate a resistance into a variety of instruments. 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 (-). OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CRED BLACK Receiver InputOhms or 2-Wire RTD Controller Transmitter Computer Three Wire RTD Connection Two Wire RTD Connection
1716 READ FUNCTIONS Select read by pressing the SOURCE/READ pushbutton until the word READ appears on the LCD display. The READ functions measure the desired signal. Multiple scales are available for some functions. MIN/MAX To read the Maximum or Minimum INPUT since READ mode was entered, simply switch to MAX or MIN. The value will appear on the LCD along with the word MAX or MIN. The MAX/MIN values are automatically updated and may be viewed at any time without disturbing the other values. RESTARTING MIN/MAX Pressing the STORE/RESET push-button will cause the 820 to store the present reading into the MAX and MIN memories. Upon releasing the STORE/RESET push- button the 820 will resume reading the input and update the MAX & MIN values as the measured signal changes. OUT OF RANGE SIGNALS Signals above or below those available for the currently selected range will be indicat- ed by Or and Ur on the display. OPERATING INSTRUCTIONS CALIBRATE FREQUENCY INPUTS Choose this function to provide pulses into frequency measuring instruments. The 820 output is a zero crossing square wave from -1V to +5V amplitude. Available ranges are from 0.01 to 10.00 kHz, 1 to 1000 Hz and from 1 to 1000 CPM (Counts-Per-Minute). CPM is used to simulate extremely slow frequency signals with greater resolution. For example, 10 Hz is equivalent to 600 CPM. To convert from CPM to Hz Divide by 60. To convert from Hz to CPM multiply by 60. 1) Disconnect any input from the instrument being calibrated. 2) Press the RANGE/TYPE push-button until the desired frequen- cy range appears. 3) Connect the red SOURCE lead of the 820 to the plus (+) input of the device and the black SOURCE lead to the minus (-). Output frequency 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 OPERATING INSTRUCTIONS !! 1 4 52 3 5V MAX INPUT 45V MAX INPUT ! 300V MAX INPUT 45V MAX INPUT!T/CFrequency Receiver Input Flowmeter Controller Transmitter Computer Logger DCS RED BLACK MIN READMAX READ STORE/RESET