Direct Action Keys; Mode Keys - Fluke 8508A User Manual

8508A
Users Manual

Direct Action Keys






Mode Keys









2-6

Direct Action Keys

Press to disable internal triggers and enable all external trigger sources. The
annunciator on the main display is lit.
An external trigger for a measurement may be generated either by pressing the
Sample key, by sending an appropriate trigger command via the IEEE-488
interface, or by a falling edge (TTL) at the External Trigger input on the rear
panel.
Press to trigger a single-shot measurement if the Multimeter is in
All measurements triggered using the
internal time delays before A-D conversion. These are listed on Table 4-2 and
4-3. During the measurement the
In calibration mode this key will initiate a calibration operation.
Press to return the Multimeter to the control of the front panel when operating
on the IEEE-488 bus. While in Local, any delays set up during remote
programming are suspended, and the standard internal delays are reinstated.
The mode can be disabled remotely by a controller using the LLO (Local
Local
Lockout) function.
Press to store the displayed value in memory. This temporary value will be
subsequently subtracted from the next measured value. The
on the main display is lit. To cancel this subtraction press the Offset key.
Press to enter calibration mode. Access to calibration mode is enabled (or
restricted) by a calibration switch on the rear panel. The CAL annunciator on
the left hand display indicates that Calibration mode is active.
Press to gain access to test operations.
Press to gain access to guarding, input zero operation, selection of alternate
inputs, and scanning operations. Several left hand display annunciators are
used to indicate the status of input, guard and zero selection.
Provides additional monitoring operations on measurements e.g. frequency (in
AC), and recorded measurements of maximum, minimum, and peak to peak.
Provides additional mathematical operations on measurements e.g. averaging,
multiplication by M, subtraction of C, and division by Z. The Math annunciator
on the left hand display indicates that a Mathematical operation is active.
Press to gain access to bus address, display adjustments, line frequency
selection, and information on cal due date, serial number and spot frequency.
Press to gain access to removing Input zero for the range selected or all the
ranges in the selected function.
The instrument can also be reset to the power up state.
key are subject to the standard
Sample
annunciator on the main display is lit.
Busy
NOTE
adj017f.eps
Ext
mode.
Ext'trig
annunciator
Offset