Schiller AT-2plus - Page 92

SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002
Page 8.7
Chapter 8
Glossary
+UP Voltage rectified from the mains input and regulated to approximately
+15 V.
UWE Upper write enable.
+U Unregulated dc supply from mains (approximately 30V).
+UBU Back-up voltage for the real time clock and static RAM.
+UD Unswitched regulated dc voltage used as power source for the
switched supply +US. The voltage is 13.5 V when mains is connected,
or battery voltage when mains is not connected. When mains is
connected, this supply charges the battery.
-ULCD Contrast voltage to LCD.
+US Input voltage for all PSUs on the power supply board from the
rectified mains or from the battery.
VCC +5 V
VMA Valid memory address.
VPA Valid peripheral address.
VSYNC Vertical synchronisation - (video / VGA output).
WP0 and WP1 ECG in - the serial multiplexed ECG serial data to the CPU sent over
the optical interface, from the ECG amplifier.
XD0..XD3 Pixel information.
XSCL Shift clock for XDn.
YD Frame synchronisation.
YDIS/ LCD off.
ZEROSET Baseline reset (on the ECG amplifier) from the processor.
Acronyms