Keysight 53230A - Figure 3-1 53230 A Continuous, Gap-Free Measurement Sequence

3 53220A/53230A Measurements
84 Keysight 53220A/53230A User’s Guide
Figure 3-1 and the following paragraphs describe continuous, gap-free
measurements with an example one second gate time.
Figure 3-1 53230A continuous, gap-free measurement sequence.
Gate time/edge count The specified (or default) gate time and the input signal
frequency determine the number of edges required to produce the first reading in
the sample count. All subsequent readings in the count are based on the same
number of edges used for the first reading. Gate time is per reading.
Start/stop edge The edge that ends the gate time of the previous reading is the
same edge which starts the gate time (edge count) for the next reading. Because
the same edge is used as a start/stop edge, there is no gap/lag/dead time
between readings in CONTinous mode.
gate open
Reading #1
Reading #2
Reading n
start
2341
stop
5
1
start
234
5
stop
start
1
234
5
stop
gate closed
gap-free
‘stop’ edge of previous reading
is ‘start’ edge of next reading
subsequent readings based on number
of edges for first reading
edges required for reading
determined by gate time
gap-free
Gate In/Out BNC:
OUTput:STATe ON
OUTput:POLarity NORMal
CONFigure:FREQuency [<expected value>, <resolution>, <channel>]
TRIGger:COUNt 1
SAMPle:COUNt <count>
SENSe:FREQuency:MODE CONTinuous
SENSe:FREQuency:GATE:SOURce TIME
SENSe:FREQuency:GATE:TIME 1
...
...
gate time (1s) gate time (1s) gate time (1s)
firmware controlled – will see fluctuations
on the output BNC but readings are continuous (gap free)