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Philips pm2521 - 6.4.1.5. Alternating current measurements (A~ rms)

Philips pm2521
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40
1.4.
3.
2.
Time
measurements (s)
When
the
time
function is
selected,
the
SI
contact
connects
the
source to
the
voltage
attenuator.
After
attenuation,
it is
connected to
the
+
input of the
comparator.
In the
same way,
as
for
frequency
measurements
the comparator
produces
output
pulses
when the
signal
peaks cross
the
trigger
level selected.
These
are passed
direct to
the
microprocessor
and also to
the
selection
gates
of the
interrupt
controller.
1. 4. 3. 3.
Trigger level
measuremen ts
When trigger
level is selected, TL1
function switch contact
routes
the input signal to
the
voltage attenuator
as
for voltage
measurements.
Contact TL3
connects the attenuated
output via the
impedance convertor to
the
+ input of the
comparator
as
for
frequency
measurements.
Switch
K301
is
open in the
trigger level function.

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