Philips 6652C - Page 8

FREQUENCY and PERIOD measurements are made very
rapidly. The PM 6654 needs only one second for a
9
digit resolution while the PM 6652, in the
same time, gives 7 digits. Both models perform
measurements such
as burst frequency, multiple
burst frequency average and externally gated
Frequency measurements,
Trigger HOLD-OFF can be activated in Frequency
and
period modes. It inhibits stop triggering
during an adjustable hold-off time after start
of the measurement, to avoid false triggering
due to noise, or interference (e.g. relay
bounce).
Mathematics
The mathematic facilities of scaling and/or off-
setting the measuring result extends the appli-
cation possibilities. Some examples:
-
VPP measurements can be converted to VRMS•
- Frequency readings from a transducer can be
calibrated as RPM.
- Liters/s, gallons/min or m/s.
-
Phase measurements can be converted from
degrees to dians.
Time interval measuring accuracy
The PM 6654 with 2ns single shot resolution
allows time interval measurements with a very
high accuracy and resolution, Averaging a large
number of measuring results in time interval
1
pulse width or rise or fall time modes gives a
resolution of less than one picosecond with the
PM 6654 and down to 10ps with the PM 6652.
Trigger accuracy
The PM 6652/54 inputs feature 1ns rise times and
20mV sensitivity over a -5V ••• +5V range. The
counter can simultaneously display the set trig-
ger levels of both the A and B channels. What
appears on the display are the real trigger
points. Automatic hysteresis compensation enab-
les triggering at the set trigger level. Syste-
matic trigger errors are thus kept to an extre-
mely low level.
The PM 6652/54 gives full control over defining
start and stop triggering. Arming and trigger
hold-off enable reject ion of unwanted signals
which would otherwise trigger the counter.
Simple programming of IEEE-488 bus performance
The PM 6652/6654 are fully programmable, inclu-
ding all trigger controls. The optional inter-
face card PM 9696 allows bus operations at a low
additional cost. The resolution and measuring
speed
of the PM 6652/54 can be fully exploited
by using the hiqh speed dump mode, allowing up
to 400 ••• 500 measurements per second. The IEEE
728/IEC-625-2 code and format norms are fully
implemented in these counters .
The PM 6652/6654 can write their own program
messages.
First one finds the best control set-
tings for a measurement. Thereafter activate the
BUS LEARN mode, and the counter sends the status
of all manually set controls to the controller.
This eliminates the risk of programming errors
and the need for debugging.
The eight "stored panel programs" P1 ... PB can
also be selected and created via the bus. This
requires only one message and greatly reduces
the bus communication load.
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