535-PROF User's Manual
Appendix 4
A-7
Calibration
V
MA
TCs
RTD
TCt
EPROM
BATTERY
ASS'Y
TB1
PV1
V
MA
2ND
PV INPUT
JUMPER
CONFIGURATION
TCs
RTD
TCt
TB2
CALIBRATION
JUMPERS—
SELECT V
AND TC
Jumper locations for
Analog,Thermocouple
and Milliamp calibration
P2
P1
PREPARATION for ALL INPUT CALIBRATIONS
Equipment for analog input calibration:
•
Precision 5-1/2 or 6-1/2 digit multimeter, e.g., Fluke 8842
®
or HP3478A
®
(a
4-1/2 digit meter will sacrifice accuracy)
•
Four small pieces of wire
•
Test leads with clips
•
#2 Phillips screwdriver
Additional equipment for thermocouple input:
•
Precision thermocouple calibrator, e.g., Micromite II
®
by Thermo Electric
Instruments
•
Special limits grade, Type T thermocouple wire
1. Disconnect power to the instrument.
2. Remove chassis from case.
3. On the Microcontroller Circuit Board, locate jumpers locations marked PV1 and
2nd near the edge connector. Reposition both jumper connectors in the 2nd lo-
cation onto pins for V and TC as shown in
Figure A4.3.
4. Connect hook up wires between terminals 31 and 32 and the multimeter as shown
in
Figure A4.4,
Set the meter for
DC volts
.
5. Reinsert chassis into the case and apply power.
The 2nd and 3rd display should read CALIBRATE ANALOG IN.
6. Allow the controller to warm up for at least 30 minutes.
7. Press the
ACK
key to get to the first step/parameter.
The 2nd display should show CAL. VREF; the 3rd display should show a value
close to 5.0000.
8. The multimeter should read a value in the range 4.9750 - 5.0250.
Use the
and
(and
FAST
) keys on the controller until the display on the
controller matches the meter reading.
Figure A4.3
Jumper Locations on the
Microcontroller Circuit Board
Figure A4.4
Input Calibration Wiring
WARNING!
ELECTRIC SHOCK HAZARD!
Terminals 1 and 2 carry live power.
DO NOT touch these terminals when
power is on.
23
24
21
22
19
20
17
18
29
30
27
28
25
26
32
31
PV1–
Hook-up
wires to
multimeter
PV1+
