Altek Process Calibrator TechChek 820 Manual

							19
READ DC VOLTAGE OUTPUTS
V,  m V
Choose this function to measure from 0.00 to 10.25 DC Volts. For
checking low level sensor outputs and other low levels change the
input range to display from 0.00 to 110.00 millivolts. Use the high
voltage connection to read from 0.0 to 200.0 VDC
1) Connect the red READ (+) lead and the black READ (-) lead of
the calibrator across the voltage to be measured.
Signals above or below those available for the currently selected
range will be indicated by OVER and UNDER on the display.
OPERATING INSTRUCTIONS
!!
1 4 52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/CVoltage Output Signal
Controller
Transmitter
Power SupplyRED
BLACK
Connection for millivolts and Volts below 10.25 VDC
Connection for Volts to 200.0 VDC
18
READ MILLIAMP OUTPUTS
mA, mA % (Percent of 4 to 20 mA)
Choose this function to measure from 0.00 to +24.00 milliamps or
-25.0 to 125.0%. 
1) Open the current loop at any convenient point along the signal
path
2) Connect the red READ (+) lead of the calibrator to the more
positive point of the break and the black READ lead (-) to the
more negative
Display the present reading, Maximum or Minimum by moving the
toggle switch from READ to MAX or MIN. If TechChek 820 is
connected in the wrong polarity, the word POLARITY will appear
in the display. Simply reverse the leads for correct indication.
OPERATING INSTRUCTIONS
!!
1 4 52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/CMilliamp Output Signal
Controller
Transmitter
P/I
DCSRED
BLACK 
						

							21
READ RESISTANCE
Ohms
Choose this function to measure resistance from 0.0 to 1000.0
Ohms. 
1) Connect the red READ (+) lead and the black READ (-) lead of
the calibrator across the resistance to be measured.
Signals above or below those available for the currently selected
range will be indicated by OVER and UNDER on the display.
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
20
MEASURE  THERMOCOUPLE SENSORS
Choose this function to read a thermocouple. The input of the
TechChek 820 is automatically cold junction compensated.
1) Disconnect the thermocouple from any instrument.
2) Press the RANGE/TYPE push-button until the desired T/C type
and temperature scale appear.
3) Use the proper thermocouple wire and corresponding minia-
ture thermocouple connector to connect TechChek 820 to the
thermocouple.
OPERATING INSTRUCTIONS
!!
T/C
1 4
52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!+- 
						

							23
MEASURE RTD SENSORS
Choose this function to read an RTD. Three wires must be use for
both 2 and three wire RTDs.
1) Disconnect the RTD from any instrument.
2) Press the RANGE/TYPE push-button until the desired RTD
type and temperature scale appear.
3) Connect using 3 wires as in the diagrams below. Spade lugs
are recommended to minimize any contact resistance. 
OPERATING INSTRUCTIONS
!!
1 4 52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/C
RED
BLACKBLACK
BLACK
BLACK
RED3
2
1RTD Element
CHECK CONTINUITY
Choose this function to check continuity. A tone will sound and a
sound symbol will appear on the display when the resistance
between the leads is less than 100 Ohms.
1) Plug the leads into the TechChek 820 as shown below.
2) Turn the selector knob to OHMs
3) Press the SOURCE/READ pushbutton until the word READ
appears on the display.
4) Press the RANGE/TYPE pushbutton until the word
CONTINUITY appears on the display
22
OPERATING INSTRUCTIONS
!!
1 4 52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/CRED
BLACK 
						

							25
READ AC VOLTAGES
Choose this function to measure from 0.0 to 250.0 V True RMS.
CAUTION: Care should be used when measuring AC voltage.
The included safety test probes or safety alligator clips  should be
used. Do not exceed voltage limits shown on calibrator.
AC Voltage Signal
Mains
Line Voltage
!!
1 4
52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/C
BLACKRED
OPERATING INSTRUCTIONS
24
COUNT FREQUENCIES
Choose this function to use the 820 as a frequecny counter.
Availible ranges are from 0.01 to 10.00 kHz, 1 to 1000 Hz and
from 1 to 1000 CPM (Counts-Per-Minute).
To measure waveforms with amplitudes between 1 V and 10.25 V
RMS use the low level inputs. Use the high voltage connection to
read waveforms with amplitudes from 10.25 to 250.0 V RMS
OPERATING INSTRUCTIONS
!!
1 4 52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/CFrequency Output Signal
Flowmeter
Flow Sensor
Variable Speed Drive
Controller
TransmitterRED
BLACK
Frequency Output Signal
Flow Meter
Line Frequency
Variable Speed Drives
!!
1 4
52 3
5V MAX
INPUT 45V MAX
INPUT
!
300V
MAX
INPUT
45V
MAX
INPUT!T/C
BLACKRED
Connection for signals with amplitudes below 10.25 V RMS
Connection for signals with amplitudes to 250 V RMS 
						

							POWER & MEASURE 2-WIRE TRANSMITTERS
RANGES & ACCURACY:Same as for MILLIAMP SOURCE
OUTPUT CURRENT: up to 24.00 mA
TYPICAL DRIVE CAPABILITY:1200 Ohms @ 20.00 mA
COMPLIANCE VOLTAGE:nominal 25 VDC @ 20 mA
2-WIRE TRANSMITTER SIMULATOR
RANGES:
1.00 to 24.00 mA; -18.8 to 125.0% of 4 to 20 mA
ACCURACY:Same as for MILLIAMP SOURCE
LOOP VOLTAGE LIMITS:Mininum, 3 VDC; Maximum 45 VDC
OVERLOAD PROTECTION:Current limited to 25 mA nominal
MILLIAMP READ
RANGES:
0.00 to 24.00 mA; -25.0 to 125.0 % of 4 to 20 mA
ACCURACY:Same as for MILLIAMP SOURCE
OVERLOAD PROTECTION: Current limited to 25 mA nominal
VOLTAGE BURDEN: 0.9V at 4 mA, 1.2V at 20 mA, 1.9V at 24 mA
DC VOLTAGE SOURCE
RANGES:
0.00 to 110.00 mV; 0.00 to 10.25V
ACCURACY:
±(0.05% of 110 mV+ 0.01mV) = ±0.07 mV
±(0.05% of 10.25 V + 0.01V) =  ±0.02V
SOURCE CURRENT:>20 mA
SINK CURRENT:>20 mA
OUTPUT IMPEDANCE: 
						

							ACCURACY RTD: ±1°C (At 1 mA Excitation Current)
RTD Type: Pt 100 Ohm DIN/IEC 751, Alpha = 1.3850 (0.00385)
RANGE RTD: -100 to 850°C; -148 to 1562°F
TEMPERATURE EFFECT:±((0.035 mV/°C)*(1/mA Excitation Current))
ALLOWABLE EXCITATION CURRENT: 0.125 to 2.0 mA continu-
ous DC
READ RTD & OHMS
RANGE OHMS: 0.0 to 1000.0 Ohms
ACCURACY: ±(0.05% of 1000.0 Ohms + 0.1 Ohm) = ±0.6 Ohms
RTD RANGE & ACCURACY: Same as for SOURCE RTDs
EXCITATION CURRENT SUPPLIED:1 mA, nominal
FREQUENCY SOURCE
RANGES: 1 to 1000 CPM (Count-Per-Minute); 1 to 1000 Hz,
0.01 to 10.00 kHz
ACCURACY:
±(0.05% of 1000 CPM + 1 CPM) = ±2 CPM
±(0.05% of 1000 Hz + 1 Hz) = ±2 Hz
±(0.05% of 10.00 kHz + 0.01 kHz) = ±0.02 kHz
OUTPUT WAVEFORM:Square Wave, Zero Crossing, -1V to +5V
±10%
RISETIME:Hz 1 Meg Ohm to 10.25V, >5 Meg Ohm to
200V
SOURCE RESISTANCE EFFECT: 0.01% per 100 Ohms
SOURCE THERMOCOUPLES
RANGES:
Type J  -100 to 1200°C; -148 to 2192°F
Type K  -100 to 1371°C; -148 to 2500°F
Type T -100 to 400°C; -148 to 752°F
Type E  -100 to 1000°C; -148 to 1832°F
ACCURACY:
1°C for temperatures above 0°C
2°C for temperatures below 0°C
COLD JUNCTION ACCURACY: ±1°C
COLD JUNCTION EFFECT: within 0.05°C per °C change
OVERLOAD PROTECTION:Fused
OUTPUT IMPEDANCE:20 mA
READ THERMOCOUPLES
RANGES & ACCURACY: Same as for SOURCE THERMOCOUPLES 
INPUT IMPEDANCE:> 1 Meg Ohm
OPEN THERMOCOUPLE DETECTION: 450 millisecond pulse.
Nominal threshold, 10 K Ohms.
SOURCE RTD & OHMS
RANGE OHMS: 0.0 to 400.0 Ohms
ACCURACY:±0.05% of Full Scale + 0.075 mV/mA Excitation Current
ACCURACY OHMS: ±(0.05% of 400.0 Ohms + 0.1 Ohm = ±0.3
Ohms (At 1 mA Excitation Current)
28
SPECIFICATIONS 
						

							3130
NOTESWARRANTY
Altek products are warranted to be free from defects in material
and workmanship (excluding fuses, batteries and leads) for a
period of three years from the date of shipment. Warranty repairs
can be obtained by returning the equipment prepaid to our factory.
Products will be replaced, repaired, or adjusted at our option. Altek
gives no other warranties, including any implied warranty of fitness
for a particular purpose.Also, Altek shall not be liable for any
special, indirect, incidental or consequential damages or losses
arising from the sale or use of its products. 
						

							32
ORDERING INFORMATION Part No.
MODEL 820 TechChek 820
PROCESS CALIBRATOR
Included with each Model 820 are:
Carrying Case with belt loop and shoulder strap 
Test Lead Kit 
NOTES 
						

							PN 1839053 Rev A April 2002
©2002 Altek Industries, Inc. Specifications subject to change without notice. 
All rights reserved. Printed in U.S.A.