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3.1.2 Self-Test Modes
The M87x has several self-tests built in to assure that the instrument is performing accurately. Refer to the appropriate
protocol manual for details on how to retrieve the self-test information. The following table lists possible faults that would be
detected by the self-tests, how the fault is indicated, the effects of the fault and any necessary corrective actions.
Bit #
Description
Factory gain calibration of Analog-Digital Signal
0(LSB)
Processor Module checksum error.
Factory offset calibration of Analog-Digital Signal
1
Processor Module checksum error.
Factory gain calibration of Signal Input Module
2
checksum error.
Factory offset calibration of Signal Input Module
3
checksum error.
Factory phase calibration of Signal Input Module
4
checksum error.
Factory defined internal ratios of Signal Input Module
5
checksum error. (Type of Signal Input Module)
User defined external transformer ratio checksum
6
error.
7
User gain correction values checksum error.
8
User phase correction values checksum error.
Factory defined board ID for Analog-Digital Signal
9
Processor Module checksum error.
Factory defined board ID for Signal Input Module
10
checksum error.
User defined denominators for TDD measurement
11
checksum error.
12
DSP program integrity checksum error.
13
DSP stack overflow.
14
Invalid or missing Amp and/or Voltage Scale Factor.
15
Protocol configuration invalid.
ML0021
Self-Test Bits
Hardware
A10 EEProm
A10 EEProm
S1x EEProm
S1x EEProm
S1x EEProm
S1x EEProm
S1x EEProm
S1x EEProm
S1x EEProm
A10 EEProm
S1x EEProm
S1x EEProm
A1x DSP Ram
A1x DSP Ram
H1x Flash File
H1x Flash File
31
August 15, 2018
Effect
Unit will continue to function using
default values, at reduced accuracy.
Unit will continue to function using
default values, at reduced accuracy.
Unit will continue to function using
default values, at reduced accuracy.
Unit will continue to function using
default values, at reduced accuracy.
Unit will continue to function using
default values, at reduced accuracy.
Unit will continue to function.
Assumes -S10 Signal Input Module
Unit will continue to function using
default values (i.e. w/o user ratios).
Unit will continue to function using
default values (i.e. w/o user gain).
Unit will continue to function using
default values (i.e. w/o user phase).
Assumes default Analog-Digital
Signal Processor Module.
Assumes default Signal Input
.
Module
Assumes default TDD Denominator.
Host trips watchdog, unit reboots.
Host trips watchdog, unit reboots
Protocol will use default Scale Factor
M87x uses default protocol
configuration
Copyright 2018 Bitronics, LLC
Default Value
A/D Gain = 1
A/D Offset = 0
CT/VT Gain = 1
CT/VT Offset = 0
CT/VT Phase = 0
Volts Ratio = 60 :1
Amps Ratio = 14.136 :1
User CT = 5:5, VT = 1:1
User Gain = 1
User Phase = 0
Module A10
Module -S10
TDD Denom = 5A
Secondary
.
Scale Factor = 1:1
M87x register set
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