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...

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...

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...

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...

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 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...

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,...

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.