Altek Process Calibrator TechChek 820 Manual

Process Calibrator
TechChek™ 820 

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...

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...

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...

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...

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...

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...

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...

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...

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....