K3HB-R

6

■ What Is Prescaling?

To make calculations using the input pulse to display rotation (rpm)

or circumferential speed, the number of pulses per rotation or the

length of the circumference must be multiplied by a certain

coefficient. This coefficient is called the prescale value.

Rotation speed (rpm) = f

× 60 × a

f: Input pulse frequency (No. of pulses per second)

a: Prescale value

If there are 5 pulses per rotation, then

a = 1/5 (= 0.2 = 2

× 10-1)

and an accurate rotation speed (rpm) can be calculated.

The actual setting is X = 2.0000 (mantissa) and Y = 10-1 (exponent).

■ What Is the Auto-zero Function?

(Set this function before using the Digital Indicator.)

If a function

f1 to f6 is set, the frequency can be force-set to zero if

there is no input pulse for a set period. This period is called the auto-

zero time. Set the auto-zero time to slightly longer than the longest

input pulse interval. (The display will not easily return to zero if the

auto-zero time is too long or left at the default setting.)

Time Unit Settings

Note: Time unit can be set only when passing time (F6) is selected.

Input Type Setting

Note: Set to

10 or 11 when there is a large variation in the display.

The largest measurement range is 30 Hz.

Proximity

sensor

K3HB-R

Setting

Meaning

off

Invalid

scal

Prescale value menu setting

min

Minute display

h.mm.ss

h.mm.ss display

mm.ss.d

mm.ss.d display (d = tenths of a second)

NO: Voltage pulse high NC: Voltage pulse low

No-contact or

voltage pulse

input

00

01

Contact

10

11