Schiller AT-2plus Service Handbook page 84

SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue 1 June 1998
Service Screen (cont.)
Electrode dc offset
TPH TEMP
EPROM
This gives the voltage drop in the patient cable and can
indicate any faults in the patient cable or patient electrode.
The value given is the dc voltage between the left leg
electrode and all other electrodes. The measurements
obtained will indicate any cable short circuits or open
circuits. The measured voltage value will depend on where
the electrodes are connected. The voltage readings that
can be expected are as follows:
• With patient connected - ± 100mV
• With patient simulator connected - ± 20 mV - this will
depend on the patient simulator used and must be taken
as a flexible measurement.
• With all electrodes shorted together: - ± 20 mV
• No patient cable connected: -350 to -450mV
This is the measured ambient temperature that the
processor uses to correct print quality.
This reading should be ambient temperature ± 5
This is the checksum for the EPROM. Its value varies
from one unit to another and may change after a software
upgrade.
The software version of the unit and the options installed
are printed on the bottom of all printouts. The only option
available is the interpretation option; an C is printed. To
obtain a printout of all settings press the following key
sequence:
ALT- 0 - 1 - any number 0...9
Details of all settings are given in Chapter 1 of this book
or in the AT-2 User Guide.
Chapter 5
Adjustments
.
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Page 5.11