12.13
Date Code 20090730
Instruction Manual
SEL-734 Meter
Testing and Troubleshooting
Meter Self-Tests
Table 12.5
Meter Self-Tests
Self-Test
Condition
Limits
Meter
Disabled
Alarm
Output
Description
IA, IB, IC, IN, VA,
VB, VC Offset
Warning
50 mV
No
Pulsed
Measures the dc offset at each of the input
channels every 10 seconds.
+5 V PS
Failure
+5.35 V
+4.65 V
Yes
Latched
Measures the +5 V power supply every
10 seconds.
–5 V PS
Failure
–4.65 V
–5.35 V
Yes
Latched
Measures the regulated –5 V power supply
every 10 seconds.
+2.5 V PS
Failure
+2.68 V
+2.32 V
Yes
Latched
Measures the +2.5 V power supply every
10 seconds.
+3.3 V PS
Failure
+3.53 V
+3.07 V
Yes
Latched
Measures the +3.3 V power supply every
10 seconds.
+3.75 V PS
Failure
+4.02 V
+3.48 V
Yes
Latched
Measures the +3.75 V power supply every
10 seconds.
–1.25 V PS
Failure
–1.33 V
–1.16 V
Yes
Latched
Measures the –1.25 V power supply every
10 seconds.
BATT
Warning
+2.3 V
No
Pulse
Measures the clock battery voltage.
TEMP
Warning
–40°C
+85°C
No
Measures the temperature at the A/D voltage
reference every 10 seconds.
RAM
Failure
–
Yes
Latched
Performs a read/write test on system RAM
every 60 seconds.
ROM
Failure
checksum
Yes
Latched
Performs a checksum test on the meter
program memory every 10 seconds.
CR_RAM
Failure
checksum
Yes
Latched
Performs a checksum test on the active copy
of the meter settings every 10 seconds.
NONVOL
Failure
checksum
Yes
Latched
Performs a checksum test on the nonvolatile
copy of the meter settings every 10 seconds.
The following self-tests are performed by dedicated circuitry in the microprocessor and the SEL-734 main board. Failures in these
tests shut down the microprocessor and are not shown in the status report.
Microprocessor
Failure
Yes
Latched
The microprocessor examines each program
instruction, memory access, and interrupt.
The meter displays
VECTOR nn
on the LCD
upon detection of an invalid instruction,
memory access, or spurious interrupt. The test
runs continuously.
Содержание SEL-734
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