Agilent Technologies E8401A, User And Service Manual, Page: 15 / 66

Getting Started 13 Chapter 1
Front Panel Features
Figure 1-4. Agilent E8401A and E8403A Basic Monitoring Front Panel
Section Indicator / Switch Description

Power
On Indicator
Standby Indicator
Green - the mainframe is turned on.
Amber - the mainframe is in standby mode; no power is applied to the VXI modules.

Supply
Voltages Indicator
Temp Indicator
Green - all voltages on the VXI backplane are within ±8% of the VXI specification.
Flashing Amber - one or more voltages is out of specification. The backplane voltages
and allowed variations are listed below:
Voltage Allowed Variation Diagnostic Pin
+5V +4.875V to +5.125V 1
+12V +11.64V to +12.6V 14
-12V -12.6V to -11.64V 2
+24V +23.28V to +25.2V 15
-24V -25.2V to -23.28V 3
-5.2V -5.46V to -5.044V 16
-2V -2.1V to -1.9V 4
Green - the power supply temperature is acceptable.
Flashing Amber - the power supply is approaching thermal shutdown. The power supply
temperature can be measured on pin 11 of the Diagnostic connector.

Fans
Fan Switch
Fans Indicator
Full - the power supply and mainframe cooling fans are operating at full speed.
Var(iable) - the power supply and mainframe cooling fans are providing adequate cooling
(default setting). Fan speed is a function of the power supply temperature and the
reference temperature (Diagnostic connector pin 12). The reference temperature is a
function of ambient temperature and load.
Green - the power supply and mainframe cooling fans are operating.
Flashing Amber - the power supply fan or the mainframe cooling fan is not operating. Fan
operation can be checked using pin 13 of the Diagnostic connector.

Backplane
Activity Indicator
SYSFAIL Indicator
Reset Switch
Green - there is communication between instruments across the backplane. Off - there is
no communication between instruments on the backplane.
Flashing Amber - one or more instruments has asserted its SYSFAIL line due to a
power-on initialization failure, self-test failure, or hardware failure. SYSFAIL is asserted
momentarily at power on and during a system reset.
Pressing the reset button asserts the SYSRESET* line on the VXI backplane. When
asserted (low), this line resets the VXI system; all VXI instruments are rest to their
power-on state.

Diagnostic
Connector
Refer to “Diagnostic Connector” on page 14.