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UNIT INDICATOR:
When lit, indicates that the frequency displayed is in
MHz, KHz, Hz and period is in nano, micro, or milli
(n/u/m) Sec.
HOLD INDICATOR:
The HOLD function is engaged the when lit.
INPUT C:
Use this input for all frequency measurements above 80
MHz. Female N type connector terminated in 50
Ω
.
LOW PASS FILTER: With this switch pushed in, the A input is routed through
a low-pass filter with a -3 dB point at approximately 100
KHz. When it is released, the A input is applied directly
to the counter.
ATT. SWITCH:
When this switch is set to x10 (pushed in) the A input is
attenuated 10:1 before application to the counter. With
the switch set to x1 (pushed out), the A input signal is
applied unattenuated. The attenuator has no effect on
the C input.
COUPLE. SWITCH:
This switch is used to select the input coupling mode,
AC or DC.
INPUT A:
Use this input for frequency measurements below 100
MHz and all period measurements. Female BNC
connector. Input impedance is1 M
Ω
shunted by < 40 pF.
GATE TIME SWITCH: This switch selects the degree of resolution on the
display in all modes except TOTAL.
HOLD SWITCH:
In the HOLD function, the display is held but the counter
continues to increment. When HOLD is released, the
display is updated and resumes counting.
FUNCTION SWITCH: This selects the desired operating mode.
a. FREQ. A: When this mode is selected, the counter reads the
frequency of the input at A. Resolution is selected
using the GATE TIME.
b. FREQ. C: When this mode is selected, the counter reads the
frequency of the input at C. All readings are in MHz.
c. PERIOD A: When this mode is selected, the counter reads the
period of the input at A. Resolution is selected using
