SC-100A manual
8
Version 3.1c
Appendix A - Test Mode
Test Mode provides various special functions that may be useful in testing the device, for example, if
troubleshooting is necessary.
•
Test Mode is entered when the POWER button is pressed longer than 2 seconds while turning the
instrument on. Remove the pH electrode if it is attached.
•
Test Mode is organized into sections. Press the POWER button briefly to move to the next section.
After the last section, Test Mode restarts the first.
•
Combinations of the yellow MODE LEDs are illuminated to indicate the section number as
shown in the table below.
•
The Stop LED (red) is illuminated when an error is detected by the instrument The Proceed LED
(green) is illuminated to indicate no error detected. The green LED does not guarantee proper
functioning; it only indicates that no problem could be automatically detected. The user should
make careful observations to discern proper operation.
•
To exit Test Mode, hold the POWER button down (5-10 seconds) until the instrument shuts off.
If the device does not shut off after 10 seconds of holding down the button, move to the next
section by releasing, then pressing again the POWER button briefly; then try to exit again.
Yello
w
LED
s
Section
Equipment Required
Description
1. Version
None.
The version number of the instrument
software is displayed.
2. Burn-in
None
The instrument goes through a
continuous “burn-in” cycle, exercising
relay, sound, LEDs, and display.
3. pH
pH probe or precision
voltage source. Do
not /- 0.5 V.
[NA]
An uncalibrated pH level is shown
in two alternating parts. First, the integer
portion of pH level is shown (1 to 14).
Next, three decimal places are shown.
Readings above 14.000 are shown as "
---
".
Readings below 0.000 are shown as
" ___".
4. SO
2
SO
2
probe or SO
2
probe simulator ( e.g.,
500 kOhm resistor)
The SO
2
current in nanoamperes is
displayed. For values under 10, one
decimal place is shown.
5. pH
Voltage
pH probe or precision
voltage source. Do
not /- 0.5 V.
[NA]
The raw voltage output from the
instrument's pH amplifier is displayed as
X.XX volts. Readings can range from
0.00 to 4.10.
