User Guide

18
Frequency and Duty Factor Measurements
Frequency Resolution Accuracy Accuracy
Range (61-633) (61-635)
400Hz 0.01Hz ±(0.01% +1) ±(0.01% +1)
4kHz 0.1Hz
40kHz 1Hz
400kHz 10Hz
4MHz 100Hz
Duty Factor Resolution Accuracy Accuracy
(61-633) (61-635)
20% ~ 80% 0.1% +6 digits +6 digits
Sensitivity: 0.5Vp-p for 15Hz ~ 1MHz
1Vp-p for 1 MHz ~ 4MHz
Min. frequency: 15Hz
Input protection: 600V rms
To Measure Frequency:
1. Plug the black test lead into the COM port and the red test
lead into the VΩ port.
2. Set the rotary switch to the Hz %DF position.
3. For duty factor, push the blue button until % is shown on
the main display, and Hz is shown in the upper right sec-
ondary display.
4. Connect the meter in parallel with the load or circuit.
5. Measure frequency or duty factor.
• Duty factor is the percentage of the signal that is high
• The period is displayed in frequency mode
• The period and frequency are displayed in frequency mode
ND 2352-1 61-633 630 Series Ins 12/22/04 9:49 AM Page 18