Datasheet

11 | Keysight | 53131A/132A/181A Counters - Data Sheet
Auto arming
Measurements are initiated immediately and acquired as fast as possible, using a minimum
number of signal edges.
Timed arming
The duration of the measurement is internally timed to a user-specified value (also known as
the “gate time”).
Digits arming
Measurements are performed to the requested resolution (number of digits) through automatic
selection of the acquisition time.
External arming
An edge on the external arm Input enables the start of each measurement. Auto arming,
timed arming modes or another edge on the external arm input may be used to complete the
measurement.
Time interval delayed arming
For time interval measurements, the stop trigger condition is inhibited for a user-specified
time following the start trigger. The 53132A offers advanced time interval arming capabilities
including use of user specified time or Channel 2 events to delay both start and stop triggers.
Measurement limits
Limit checking
The measurement value is checked against user-specified limits at the end of each
measurement.
Display modes
The measurement result may be displayed as either the traditional numeric value or graphically
as an asterisk moving between two vertical bars.
Out-of-limits indications:
– The limits annunciator will light on the front panel display.
– The instrument will generate an SRQ if enabled via GPIB.
– The limits hardware signal provided via the RS-232 connector will go low for the duration of
the out-of-limit condition.
– If the analog display mode is enabled, the asterisk appears outside the vertical bars, which
define the upper and lower limits.