35
Figure 26
b. A 4 digit number is shown on the display. Adjust the number until high duration
of the TTL signal is the closest value to 500 microsecond.
c. Press the OK soft key to finish this step. The message “Function calibration
done.” is displayed on the screen.
8.2 Pulse generator calibration
Equipment used:
•
Digital multimeter (DMM)
•
Oscilloscope with probe set to x10.
The precision of the calibration depends on the precision of the oscilloscope and
DMM used.
To calibrate the Pulse generator module, 4 steps must be completed.
The following rules are applied:
•
Use the Level knob from the Pulse generator module to change the
displayed value.
•
Use the Right and Left arrow keys from the Pulse Generator module to
move the digit selection inside the selected number.
8.2.1 Step 1
a. Set the DMM to measure DC voltage. Connect the DMM probe to CMOS and
GND terminals of the Pulse Generator module.
b. Select Pulse Generator from the calibration menu. The CMOS LED will turn
on, the TTL LED will turn off and PB-507 will display:
