User Manual
CHAPTER 4. MEASUREMENT SETUP 19
1. In the “Meter” interface Press the soft key corresponding to either “U-RANGE” or “A-RANGE”, and use
the knob or the arrow keys to select the voltage or current range desired. See Table 4.1
2. Press the “Enter” key to conrm the setting. Otherwise the instrument will automatically conrm and exit
the setting after 5 seconds of no activity.
CF 3 CF6
Voltage 15, 30, 60, 150, 300, 600V 7.5, 15, 30, 75, 150, 300V
Current 5, 10, 20, 50, 100, 200, 500mA, 1, 2, 5, 10, 20A 2.5 ,5 ,10 ,25 ,50 ,100 ,250mA, 0.5, 1, 2.5, 5, 10A
Table 4.1: Current and Voltage Ranges per Crest Factor setting
4.1 Voltage and current range
4.1.1 Fixed range
Select the required range from a number of options. For the voltage range, when the crest factor is 3, the
maximum option is 600V and the minimum option is 15V. When the crest factor is 6, the maximum option is
300V and the minimum option is 7.5V. See Table 4.1
Measurement accuracy is improved by minimizing the range for a
given input signal.
4.1.2 Auto Range
The measurement range adjusts automatically according to the input signal, and uses same ranges as in Fixed
range mode. See Table 4.1.
Adjustment of the range occurs when the following conditions occur:
Increasing range
• Urms or Irms exceeds 110% of the current range setting.
• When the crest factor is 3, and the peak voltage or current exceeds 330% of the range currently set.
• When the crest factor is 6, and the peak voltage or current exceeds 660% of the range currently set.
Decreasing range
• Urms or Irms is less than or equal to 30% of the current measurement range.
• The crest factor is 3. The value Upk or Ipk of the input signal is less than 300% of the range at the
following level.
• The crest factor is 6. The value Upk or Ipk of the input signal is less than 600 % of the range at the
following level.
The selected automatic range may change when the input is a random
pulse. In this case, a xed range should be used.