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INPUT C, BNC : Input for frequency measurements above 80MHz
Female BNC connector terminated in 50
Ω
.
LOW PASS FILTER : With this switch pushed in, the input B is routed through
a SWITCH(LPF) low-pass filter with-3dB point of
approximately 100KHz. When it is released, the input B
signal is applied to the counter. Same as input B
function for input A.
ATT. SWITCH : When this switch is set to x 10 (pushed in) the input B
is
attenuated 10 :1 before application to the counter with
the switch set to x 1 (pushed out), the input B signal is
applied. The attenuator has no effect on the input C.
INPUT B, BNC
: Input for frequency measurements below 100MHz
Female BNC connector terminated in 1 M
Ω
input
resistance, shunted by < 40pF capacitance.
COUPLE. SWITCH : The switch is used to select the input-coupling mode AC
or DC.
COM/SEP.
:COM. or SEPARATION for INPUT A,B
INPUT A, BNC :Input for frequency measurements below 100MHz.
Female BNC connector terminated in 1 M
Ω
input
resistance, Shunted by < 40pF capacitance.
GATE TIME SWITCH : This switch select the degree of resolution of the display
in all modes except TOTAL.
HOLD SWITCH : In hold function the display held but the counters
continue to increment. When the hold is released, the
display is updated and resumes counting.
SLOPE SWITCH : Selects positive going or negative going edge of input A,
B signal for triggering. When pushed in, negative going
edge is selected; when pushed out, positive going edge
is selected.
FUNCTION SWITCH : Select the desired operating mode.
a. FREQ. A. When this mode is selected, the counter
reads the frequency of the input A.
Resolution is selected using the GATE TIME.
b. FREQ. B. When this mode is selected, the counter
reads the frequency of the input B. Resolution is
selected using the GATE TIME.
c. FREQ. C: When this mode is selected, the counter
reads the frequency of the input C. All readings are in
MHz.
d. PERIOD A. When this mode is selected, the counter
read the period of the input A Resolution is selected
using the GATE TIME.
e. TOTAL A. When this mode is selected, the unit counts
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