Bk-precision 1823A - Manual User Manual download pdf (Page 14)

RS-232C CONNECTOR :

Connector for serial interfacing with a computer.

3-2. Operating Instruction

Below is the basic operating information needed for frequency counter.

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.

CAUTION

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 INPUT A, B (0.1 Hz  100 MHz)

a. Apply the signal to be measured to the input A and/or B BNC.

b. Set the FREQ. A and/or B 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 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

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Bk-precision 1823A - Manual User Manual Page 14