PAGE 54
5.3.4 TEST 4 EXTERNAL RAM CHECKSUM TEST
This is a checksum test to verify the integrity of data stored in RAM and indicate the number
of times the instrument has had an Error 16, 17 and 18. The unit may have automatically
recovered from these errors. No special test equipment is required.
With tSt4 displayed, press and hold the DOWN key, then press the SCROLL key. The
display will blank momentarily, then momentarily display three numbers, and then tSt4 will be
displayed. These numbers indicate the number of times Error 16, 17, and 18 have occured
respectively. Test 4 can be executed again, or another test may be selected.
5.3.5 TEST 5 KEYPAD/DISPLAY TEST
This test allows the operator to verify that the keys work and that all display elements can be
lit. No special test equipment is required.
With tSt5 displayed, press and hold the DOWN key, then press the SCROLL key and then
release both keys. The display will go blank. The following code will be displayed while the
corresponding key is pressed:
Key Display
SCROLL SCrL
UP uAro
DOWN dAro
RUN/HOLD run
UP and DOWN (All LED's and segments lit)
To exit, press the SCROLL and UP key simultaneously, tSt5 will be displayed.
5.3.6 TEST 6 RELAY/SOLID STATE RELAY DRIVER OUTPUT TEST
Allows the operator to verify that the Relay and/or the Solid State Relay Driver output(s) are
working. A volt/ohm meter will be required to test the output.
With tSt6 displayed, press and hold the DOWN key, then press the SCROLL key. oFF will be
displayed. For SPST Relay outputs, connect the meter across the relay output in the ohm
scale. The meter should read continuity with the relay on and infinity when the relay is off.
For SSR Driver outputs, connect the meter across the output in the Volt DC scale. The meter
should read 5 VDC when the SSR driver is on and 0 VDC when the driver is off. Press and
release the DOWN key to advance through the following sequence:
Display Relay On
rLYA A Only
rLYb B Only
rLYC C Only
oFF None
To exit, press the SCROLL key and tSt6 will be displayed. The existence of Relay and Solid
State Relay Driver output(s) is dependent upon the hardware configuration.
5.3.7 TEST 7 CURRENT 1 OUTPUT TEST
This test allows the operator to verify that the current output(s) are functioning properly or will
allow the selection of an output value for testing of associated equipment. A milliamp meter is
required for testing.
With tSt7 displayed, press and hold the DOWN key, then press the SCROLL key. The
display will indicate 4 milliamps. Use the UP and/or DOWN key to increase or decrease the
current output in 1 mADC steps from 4 to 20mADC. The current output reading should be
± 0.5 mADC at any output value. To exit the test, press the SCROLL key and tSt7 will be
displayed. The existence of mADC current output is dependent upon the hardware
configuration. See Appendix A-3 (page 65 or 66) to make sure hardware is present.
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