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Speed Summary
The following table summarizes the time
that can be gained when fine tuning the
measurement process.
The normal dead time between frequency
measurements is approximately as fol
-
lows:
48.8 ms for the PM6680B.
85 ms for the PM6681.
75 ms for the PM6685.
If you should read out the measuring re
-
sult to the controller add read out time to
each result. (Consult your controller man
-
ual.)
+
Turning the real-time calculations on/off will not affect the dead time because the
calculations are still done inside the measurement loop during the output of data.
*
It takes longer time for PM6681 to determine trigger levels than for PM6680B,
why? The reason is that PM6681 must find the correct level from 16 times as many
triggerlevel setting steps than thePM6680B/85 (1.25 mV steps versus 20mV steps).
How to Measure Fast
Speed Summary 7-11
Individually Synchronized Measurements
Speed Improvement
Actions
None, normal READ?
AUTOtrigger OFF
INT:CONT and GET
Display OFF
CAL:INT:AUTO OFF
100ns resolution
Dead Time Between Measurements Including
Transfer to Controller
ASCII Data Format Real Data Format
PM6680B PM6681 PM6685 PM6680B PM6681 PM6685
U
Approx.
50 ms
Approx.
85 ms*
Approx.
75 ms
Approx.
45 ms
Approx.
85 ms*
Approx.
75 ms
U 19 ms 10 ms 23 ms 15 ms 9 ms 20 ms
UU 12 ms
9ms
20 ms 9 ms 8 ms 17 ms
UUUU 12 ms
5.5 ms
12 ms 9 ms 4.2 ms 9 ms
UUUUU 12 ms
5.5 ms
12 ms 8 ms 4.2 ms 8 ms