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GENERAL I NFORMA Tl ON
3.4
The frequency of a signal can be measured in one of two ways; either directly, by
counting the number of cycles of that signal which occur during a known period
(the reading is displayed in units of frequency i.e. Hz, kHz, etc.) or by measuring the
period of the signal and displaying the reading in units of time, the reciprocal of which gives
the frequency. The period measurement method is available for input signal frequencies in
the range 10Hz to 3MHz, and is particularly recommended for frequencies lower than 10kHz.
FREQUENCY MEASUREMENT
3.5
(1) Connect the unknown signal to the input socket.
(2)
Ensure that the function switch is set to FREQUENCY or FREQ A. (On battery
pack operation ensure the switch on the battery pack is set to OPERATE).
(3) Select maximum attenuation which allows the display to operate.
(4) Select, using the bank of push-buttons on the front panel the gate time which
allows the redding to fill all six windows of the display without overflow.
PERIOD MEASUREMENT
3.6
(1) Connect the unknown signal (max.frequency 3MHz) to the input socket.
(2) Set the Function switch to PERIOD.
(3) Select maximum attenuation which allows the display to operate.
(4) Select the number of cycles to be timed by depressing the appropriate Gate
Time push-button. For maximum "resolution" select a gate time which fills
a
II
windows of the display without overflow.
OVERSPILL
3. 7
To o!:>tain high resolution when measuring higher frequencies it may be necessary to
11
overspill
11
one or more of the left-hand digits. First of all, select a short gate time
and record the most significant digits displayed, then select a push-button giving a longer
gate time to display the less significant digits to the required resolution.
3-3
9057/9059
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