3980xpi Users Manual - Data I/O Corporation

Performance Verification
Figure A-4. Test Points on the Connector Block
PIN 72
(Plugged)
PIN 78 (+10V)
Checking the Master Clock
1. Plug in the programmer and turn on the power switch.
2. Check the 8 MHz clock signal by placing the ground probe of your
frequency counter (or oscilloscope) on pin 1 (ground) of the 78-pin
connector block. Place the test probe on pin 28 shown in Figure A-4.
WARNING: Make sure the ground and test probes are on
the correct pins.
The clock signal should read as follows:
Checking the Reference Voltages
40
78
39
1
PIN 28 (8MHz)
PIN 24 (+15V)
PIN 1 (GROUND)
Minimum Nominal Maximum
7.999 MHz 8.000 MHz 8.001 MHz
3. Check the +10 voltage reference by placing one probe of your digital
multimeter on pin 78 (+10V) of the 78-pin connector. Place the other probe
on pin 1 (ground). Both pin locations are shown Figure A-4.
WARNING: Make sure the probes are on the correct connector pins.
A-4 3980xpi/3980/3900/2900 User Manual
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