106
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
083730510A DCN8172
MOTHERBOARD
A/D
F
UNCTIONS
The simplest method to check the operation of the A-to-D converter on the motherboard is
to navigate to the Dashboard and check the two A/D reference voltages and input signals
that can be easily measured with a voltmeter (configure the Dashboard to show the
necessary parameters).
1. Navigate to the Dashboard to view the value of Ref 4096mV and Ref Ground
(configure if needed: Section 2.5.3).
•
If both are within 3 mV of nominal (4096 and 0), and are stable (±0.2 mV)
then the basic A/D is functioning properly. If not then the motherboard is bad.
2. Choose a parameter in the Dashboard function list such as Raw Box Temp.
•
Compare the voltage at its origin (see the interconnect drawing in Appendix
B) with the voltage displayed through the signal I/O function.
•
If the wiring is intact but there is a large difference between the measured and
displayed voltage (±10 mV) then the motherboard is bad.
S
TATUS
O
UTPUTS
Figure 5-12. Typical Set Up of Status Output Test
To test the status output electronics:
1. Connect a jumper between the “D" pin and the “
” pin on the status output
connector.
2. Connect a 1000 ohm resistor between the “+” pin and the pin for the status
output that is being tested.
3. Connect a voltmeter between the “
” pin and the pin of the output being
tested.
4. In the Utilities>Diagnostics>Digital Outputs menu (see Section 5.7.3), scroll
through the outputs until you get to the output in question.
5. Alternately turn on and off the output noting the voltage on the voltmeter.
•
It should vary between 0 volts for ON and 5 volts for OFF.
1
2 3
8
4
D
5 6 7
+
V
+DC Gnd
1000
Ω
SYSTEM_OK
Содержание T500U
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