Amrobe 34XR-A Manuale d'uso - Pagina 8

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Measuring Frequency

1. Set the Function Switch to Hz.
2. Connect the Test Leads: Red to Hz, Black to COM
3. Connect the Test Probes to the signal source.
4. Read the display. The Meter will autorange for the best resolution.

Measuring Dutycycle

1. Set the Function Switch to %.
2. Connect the Test Leads: Red to %, Black to COM
3. Connect the Test Probes to the signal source.
4. Read the display. The Meter will autorange for the best resolution.

Additional Features

Input Test Lead Warning

The meter emits a continuous tone when a test lead is placed in the µA mA or 10A
input jack and the Function/Range Switch is not set to a correct current position. (If
the meter is connected to a voltage source with leads connected for current, very
high current could result). All current ranges are protected by fast acting fuses.

True-rms Measurements

For ac measurements most DMMs average the ac input signal and display the
result as an estimated rms value. This average-responding method is accurate for
sinusoidal waveforms, but can be very inaccurate for distorted waveforms. To
ensure the most accurate measurements, always use a true-rms DMM when
measuring ac voltage or ac current on circuits for the following kinds of
applications:
• Power Supplies - diodes
• Controllers
• Power Limiting - SCR or Triac
• Starting - motors
• Florescent Lighting - ballasts
• Speed Control - motors
• Pulsed Signals
• Any non-sinusoidal ac waveform

MIN MAX Measurements

The MIN MAX function reads and updates the display to show the maximum or
minimum value measured after you press the MIN MAX button.
Pressing the MIN MAX button for less than 1 second will put the meter into a mode
of displaying the maximum, minimum, or actual readings. Each time the button is
pressed, the meter will cycle to the next display mode as shown in the table below.
Press the MIN MAX button for more than 2 seconds to exit MIN MAX.
Button
< 1 second
< 1 second
< 1 second
> 2 seconds
Display
MAX
MIN
MIN MAX (blinks)
Exit MIN MAX
Value Displayed
Maximum value after feature activated
Minimum value after feature activated
Normal measurement, actual reading
Normal measurement, actual reading
6
See Figure
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See Figure
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