Additional Features; Input Test Lead Warning; True-Rms Measurements; Min Max Avg Measurements - Amprobe 37XR-A Manual De Uso

Additional Features

Input Test Lead Warning

The meter emits a continuous tone when a test lead is placed in the 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 AVG Measurements

The MIN MAX AVG function reads and updates the display to show the maximum
or minimum value measured after you press the MIN MAX AVG button.
Pressing the MIN MAX AVG button for less than 1 second will put the meter into a
mode of displaying the maximum, minimum, average, 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 AVG button for more than 2 seconds to disable
this feature.
Button Display
< 1 second REC MAX
REC MIN
< 1 second REC AVG
< 1 second
REC
> 2 seconds Exit MIN MAX AVG

Peak Hold Measurements

Note: The PEAK function calibrates itself to meet the specifications.
Peak Hold records and stores the positive and negative peak values that occur while
measuring ac current or ac voltage. To enable the Peak Hold feature press the PEAK
button for more than 2 seconds. The display will show CAL to indicate the
calibration cycle is in process. After the CAL indication clears, press the PEAK
button again to display the maximum (P+) value for the ac voltage or ac current
being measured. The display will toggle between the P+ and P- readings each time
the PEAK button is pressed. Press the PEAK button for more than 1 second to exit
the PEAK function.
Value Displayed
Maximum value after feature activated
Minimum value after feature activated
Average value after feature is activated
Actual reading, min max being recorded.
Normal measurement, actual reading
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