Frequency Measurements - UNISource Corporation FC-8300 Operation Manual

Below is the basic operating information needed for frequency counter.
1. APPLICATION OF INPUT VOLTAGES HIGHER THAN THE LIMITS LISTED IN
THE SPECIFICATIONS SECTION MAY DAMAGE THE COUNTER. BEFORE
APPLYING ANY SIGNAL TO THE INPUTS, MAKE CERTAIN THAT IT DOES NOT
EXCEED THESE SPECIFIED MAXIMUMS.
2. FREQUENCY COUNTER GROUND POINTS ARE CONNECTED DIRECTLY TO
EARTH GROUND. ALWAYS CONNECT FREQUENCY COUNTER GROUND
ONLY TO GROUND POINTS IN THE CIRCUIT UNDER TEST.

3-3. Frequency Measurements

3-3-1
1.800.561.8187
a. Connect the unit to AC power cord into receptacle on rear panel and
plug into AC inlet.
b. To Turn on equipment, push power on-off switch on.
c. set the function indicator position to FREQ A and Gate time indicator to
1 Sec position.
INPUT A, B (0.1Hz ∼ ∼ ∼ ∼ 100MHz)
a. Apply the signal to be measured to the input A and/or B (8023, 8030U
only) BNC.
b. Set the FREQ. A and/or B (8023, 8030U only) of function switch.
c. Select the degree of resolution desired, using the gate time
selector switch.
d. Frequency is given by the display. The gate indicator lights while each
measurement in progress, and the display is updated at the end of each
measurement interval.
e. Engaging the hold switch "freezes" the display at the existing reading,
When hold is released, the display is updated and resumes counting.
f. If necessary, engage the attenuator switch When set to x 10 (pushed
in), this switch attenuates the input A and/or B(8023, 8030U only) signal
by a factor of approximately 10 before application to the counter. This
helps prevent miscounting caused by noisy or improperly terminated high
amplitude signals.
g. If necessary, engage the LPF (low pass filter) switch This route the input
A and/or B through a low pass filter (-3 dB point of approximately 100
KHz) before application to the frequency counter. This helps eliminate
counting errors in low frequency measurements by minimizing effects of
high frequency noise present on the input.
h. When measurement the lower cut-off frequency (10 Hz), pushed in DC
coupling position.
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