5.2 Display Update Rate
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NORMAL
• The digital display update rate at power on is about twice per
second.
SLOW
• If fluctuations make the measured value hard to read during cur-
rent measurement, set the display update rate to SLOW (about
once every three seconds) to improve readability.
• Measurement response time is about eight seconds, so if the
measurement fluctuates severely, some time may be needed for
the display value to stabilize.
• When
SLOW
is selected with AUTO ranging and the range
switches automatically in response to a change in measured cur-
rent, measurement is temporarily inhibited (because the display
update is fast and measurement response is slow, range
changes are delayed). An error also occurs in MAX and MIN dis-
played values.
Therefore, if the measured current is expected to change, manu-
ally select the H range.
• For current measurements at 10 Hz and lower, accuracy in
AC+DC mode is only guaranteed with SLOW display update rate
(measurement response time).
FAST
• During current measurement, the display update rate for mea-
sured values is set to about ten times per second. This rate is
most suitable for applications such as starting current measure-
ment. So that starting current will be easy to read, press the
button to enable MAX value display.
• For starting current measurement, a continuous waveform of at
least 200 ms is required. Measured values will be too low if the
waveform is shorter than that.
• Accuracy cannot be guaranteed for measured current frequen-
cies below 45 Hz.
Summary of Contents for 3290-10
Page 1: ...CLAMP ON AC DC HiTESTER INSTRUCTION MANUAL 3290 10...
Page 2: ......
Page 6: ...iv Contents...
Page 14: ...8 Usage Notes...
Page 42: ...36 2 5 Turning Power On and Off...
Page 54: ...48 3 6 Measuring Duty by Timer...
Page 149: ...4 5 6 7 8 9 10 11...
Page 150: ......