GW Instek GFC-8131H - Manual (Page 5)

FREQUENCY COUNTER
USER MANUAL
8
z Front Panel
Fig. 1 Front panel
FREQUENCY COUNTER
USER MANUAL
9
5. APPLICATION
(1) Signal Measurements
Frequency range between 0.01Hz and 120MHz, press FREQ A switch,
then connect input signal to the channel A input BNC.
Frequency range between 50MHz and 1.3(2.7) GHz, press FREQ B
switch, then connect input signal to the channel B input BNC.
Press “PRID” switch to select period mode of operation for signal on
input A.
(2) Gate Time Settings
The instruments features continuously adjustable gate time selection
from 10ms to 10s or one period of input, depending on whichever is
longer. The GATE TIME adjustment affects the sampling rate and the
resolution of the reading.
Turn the knob counterclockwise for updating faster reading, or turn it
clockwise for more resolution (digital display).
Pulling out the GATE TIME knob to freeze the latest displayed reading
for being written down. Then return the counter to normal operation by
pressing back the knob.
When the instrument is starting measurement, the LED indicator above
the GATE TIME knob will light. In normal operation, it will blink at a
rate setting by GATE TIME knob.
(3) Trigger Level Adjustment
Adjust the trigger voltage of channel A input signal by pulling and
turning the TRIG LEVEL knob for triggering. The trigger voltage is
variable over ±2.5V×ATT setting.
If push the knob, it can be functioned as auto-triggering.(this knob is
only available for channel A.)