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 V
Ω
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
