FUNCTION AND RANGE
HINTS AND COMMENTS
The counter measures the positive pulse width of the
signal on Input-A.
Range:
100 ns to 200 000 000 s.
If you are interested in the negative pulse width
instead; first measure the period and make a note of
the result, then measure the pulse width and
substract it from the period reading.
The set Measuring-time controls the time during
which the main gate is opened, allowing pulses to en-
ter the counting logic. A longer Measuring-time gives
higher resolution readouts with more digits displayed.
The time the gate is open is not exactly the preset
Measuring-time, because the Frequency Counter syn-
chronizes the measurement with the input signal in or-
der to measure complete periods. If the period of the
input signal is longer than the set Measuring-time, the
main gate does not close again until the period is
completed.
If you wish to do one measurement instead of
repetitive measurements, see DISPL HOLD.
For PER A and WIDTH exactly one period or one
time interval is measured. The minimum result possi-
ble is 100 ns.
The display time will be 100 ms.
When set to SINGLE, FREQ A and, RPM A, the
Measuring-time is one cycle of the input signal or
3 ms, whichever is longest. When set to SINGLE and
FREQ B, the Measuring-time is 3 ms.
The input frequency is limited to 16 MHz for FREQ A,
PER A, and RPM A.
If external reference is used, the EXT REF indicator
will not be switched-on until after the first
measurement.
A Frequency-A measurement will result in 6-7 digits
on the display.
A Frequency-A measurement will result in 7-8 digits
on the display.
A Frequency-A measurement will result in 8-9 digits
on the display.
OPERATING INSTRUCTIONS
Page: 13
PM 6669 - OPERATORS MANUAL