Users’ Manual
EDI-53 Series Digital Indicator
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7
TEST MODE OPERATION
The EDI-53 indicator does a self test of its hardware during power up which is known as ‘Power On Self
Test’ (POST). During the POST it displays the message ‘SELF TEST’ on the display. A more detailed
diagnostic test can be performed on some sub-systems in the ‘Test mode’.
To enter the ‘Test mode’ turn off the indicator. While pressing the ‘VOLTS’ key turn on power to the
indicator. The display will show the following messages in sequence. Remember, these are typical
examples and the messages on your display might be slightly different.
EDI-53 V:02.00
[line 1]
-- SELF TEST --
[line 2]
---- PASSED ----
[line 3]
-- TEST MODE –
[line 4]
RevD May 14 2004
[line 5]
RevT 15:08:44
[line 6]
Enter TEST # ?
[line 7]
The first line [line 1] shows the Version number. The number on the left of the decimal point ‘02’ is known
as the major version number and the number ‘00’ to the right of the decimal point is known as the minor
version number.
The second message [line 2] indicates that the indicator is conducting some internal diagnostic checks. If
these tests are satisfactory that the message in line 3 appears. Otherwise an error beep or an error
number display is shown on display.
Line 4 indicates that the indicator has entered the ‘test mode’ operation. Line 5 shows the revision date of
the software program, and line 6 shows the revision time of the software program. This information is
useful for Encardio-rite’s service engineer in trouble shooting software problems or bugs. As the product
evolves over time, small corrections are made to the indicator software to overcome known problems. In
technical terms we call it bug fixes.
While reporting any problem with the indicator you should quote the above review date and time along
with the version number so that our service engineers can find out if any later release of the software can
correct the problem.
The message in Line 7 freezes on the display and the indicator waits for you to enter the ‘Test number’.
ADC Check (or re-calibration) — Key press ‘3’
[CAUTION: Should the indicator need recalibration it must only be done either by an Encardio-rite service
engineer or by a qualified electronics technician with access to proper calibration equipment.]
NOTE: For accurate result the indicator should be kept at the place where calibration is to be checked for
at least 30 minutes before recalibration so that the indicator components attain equilibrium with the
ambient temperature.
This test is used to check and/or calibrate the indicator’s Analogue to Digital Converter ( ADC). The ADC
converts the input current or voltage signal to a digital (numeric) form which is then sent to the
microcontroller for further processing. To run the test press key ‘3’. Display will show
ADC CHECK
[line 1]
ADC: 0
[line 2]
ADC: 2140
[line 3]
The first message [line 1] tells that the indicator is going to start the ADC check mode. The second
message [line 2] will sometimes appear briefly as the ADC settles down and completes its first
conversion. The third line shows a numeric value proportional to the voltage measured by the internal
ADC.
