Technical data

Calibrator Output Operations 2

U1401A User’s and Service Guide 41

Square Wave Output

The square wave output can be used to generate a PWM

(pulse width modulation) output or provide a synchronous

clock source (baud rate generator). You can also use it to

check and calibrate flow- meter displays, counters,

tachometers, oscilloscopes, frequency converters, frequency

transmitters, and other frequency input devices.

The frequency, amplitude, duty cycle, and pulse width of the

square wave output are all adjustable.

To select the square wave output function:

1 Turn the rotary switch to the position.

2 Press SHIFT to access the shifted operations of the keypad.

The annunciator will appear on the display.

• The default settings for the parameters are 150 Hz

(frequency), 50.00% (duty cycle), 3.3333 ms (pulse

width), and +5 V (amplitude). See Figure 2- 7.

3 Press OUTPUT to output the square wave signal.

There are 28 frequencies to choose from (See Table 2- 3). To

change the frequency:

1 Press SHIFT to access the shifted operations of the keypad.

The annunciator will appear on the display.

2 Press MODE to select frequency adjustment. The

annunciator will appear on the display.

3 Select the frequency by pressing or .

4 Press OUTPUT to output the signal.

Table 2 - 3 Available frequencies

Frequency (Hz)

0.5, 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 240, 300, 400,

480, 600, 800, 1200, 1600, 2400, 4800