Agilent Technologies 6541A, Руководство по обслуживанию

Страница: 139 / 179

Diagrams 139
Table 6-1. Signal Name Descrptions (continued)
Signal Name Description
ROM* Read only memory chip select
SPCLR Secondary power clear
SRQ Service request (GPIB)
SRX Secondary receive serial data
STX Secondary transmit serial data
THERM AMB Ambient temperature
THERM HS Heat sink temperature
UART* Universal asynchronous receive/transmit chip select signal
VMON Voltage monitor
VOS Voltage offset
VPROG Voltage programming
WR* Write
15 ISUP 15 volt supply is up (has stabilized)
Test Points
Table 6-3 lists the test points that appear on the schematic and component location diagrams. The table includes the test
point (e.g., , the circuit point (AlU608-l5), and the signal name (CV). The "Measurement and Conditions" column
gives signal measurements and the conditions (e.g., operating mode) required to obtain the measurement. Where
measurements differ, the applicable models are specified in the table. The following table list summary information about
notes appearing in schematic diagrams.
Table 6-2. General Schematic Notes:
1. All resistors are in ohms +1% 1/8 W, unless otherwise specified.
2. All capacitors are in microfarads unless otherwise specified.
3. Signal lines that are terminated by flags continue on other sheets, and may also go to other locations on the same sheet.
Example: CVPROG (SH.2 8C); "SH.2 8C" indicates the sheet number and the coordinates on that sheet where the
CVPROG signal line goes.
4. Unterminated signal lines go to at least one other location on the same sheet.
Example: _PRX (3A) where "3A" indicates the coordinates on this schematic sheet where the PRX signal line goes.
5. Unless otherwise noted, bias connections to integrated-circuit packages are as follows:
Common + 5V
14-pin packages pin 7 pin 14
16-pin packages pin 8 pin 16
20-pin packages pin 10 pin 20