Table of Contents
Advertisement
I.L. 40-386.3
7)
Using a battery and potentiometer, connect the adjustable voltage to TP1, and
common to TP2. (Apply voltage per steps 11 and 12.)
8)
Apply a rated dc voltage across FT-20 and FT-11. Turn "ON" the dc power
source.
9)
On the front panel, depress the SELECT push-button until the TEST mode is in-
dicated.
5.4.2
A/D Calibration
10)
Raise the Function field display to A/D CAL mode. The value field display shows
the average Hex value of the analog input over one cycle.
11)
Set the Voltmeter input to -4.99878 Vdc. Adjust Pot P16 until the Value display
reads C009 (see A/D Converter offset adjustment).
12)
Set the voltmeter input to +4.99634 Vdc. Adjust Pot 17 until the Value display
reds 3FF4. (see A/D Converter Gain adjustment.)
13)
Turn "OFF" the dc power supply.
14)
Remove the battery voltage from TP1 and TP2.
15)
Remove the digital voltmeter.
16)
Replace U6 into its socket.
17)
Turn "ON" the dc power supply and adjust Pot P15 until the Value display reads
0 or FFFF.
NOTE:
5.4.3
Real-Time Clock Calibration on Microprocessor Module
18)
Connect a precision period/counter instrument to TP1 and TP2 (common) on
PWR supply. Adjust variable capacitor (C6) to read the period of pulses at TP1.
It should be 1.000000 second ( 0.000002).
19)
Turn "OFF" the dc power supply.
20)
Remove the power leads and external connector.
21)
Move jumper from JMP6 to JMP3 position and replace front panel with six
screws.
5-16
The value "FFFF" is a hexadecimal number.
(10/94)
Advertisement
Table of Contents
