Digital Multimeter HDM3055 Series Manual

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Resistance

This section describes how to configure 2-wire and 4-wire resistance measurements from the front panel.

Step 1: Configure the test leads as shown.

2-wire Resistance:

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Step 5: Press AC Filter and choose the filter for the measurement. The instrument uses three

different AC filters that enable you either to optimize low frequency accuracy or to achieve faster

AC settling times following a change in input signal amplitude.

The three filters are 3 Hz, 20 Hz, and 200 Hz, and you should generally select the highest frequency

filter whose frequency is less than that of the signal you are measuring, because higher frequency

filters result in faster measurements. For example, when measuring a signal between 20 and 200 Hz,

use the 20 Hz filter.

If measurement speed is not an issue, choosing a lower frequency filter may result in quieter

measurements, depending on the signal that you are measuring.

NOTE For accurate displayed statistics of AC measurements in Front Panel mode, the default manual

trigger delay ([Acquire] > Delay Man) must be used.

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Step 4: Press Range to select a range for the measurement. You can also use the [+], [-], and

[Range] keys on the front panel to select the range. (Auto (autorange) automatically selects the

range for the measurement based on the input. Autoranging is convenient, but it results in slower

measurements than using a manual range. Autoranging goes up a range at 120% of the present

range, and down a range below 10% of the present range. Press More to switch between the two

pages of settings.

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Step 2: Press [ACI] on the front panel.

Step 3: The 3A terminals are selected by default. The Terminals softkey toggles

between the 3 A terminals and the 10 A input terminals. When you change this to 10 A, the

measurement range automatically becomes 10 A.

CAUTION When making measurements using the 10A terminals, the presence of a signal

on the 3A terminals can cause significant errors.

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You can also configure the measurement using the 10 A terminal, which is recommended when

measuring current above 1 A:

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AC Current

This section describes how to configure AC current measurements from the front panel.

Step 1: Configure the test leads as shown.

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Step 6: Auto Zero: Autozero provides the most accurate measurements, but requires additional

time to perform the zero measurement. With autozero enabled (On), the DMM internally measures

the offset following each measurement. It then subtracts that measurement from the preceding

reading. This prevents offset voltages present on the DMM’s input circuitry from affecting

measurement accuracy. With autozero disabled (Off), the DMM measures the offset once and

subtracts the offset from all subsequent measurements. The DMM takes a new offset measurement

each time you change the function, range, or integration time. ( There is no autozero setting for 4-wire

measurements.)

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Step 5: Press Range to select a range for the measurement. You can also use the [+], [-], and

[Range] keys on the front panel to select the range. (Auto (autorange) automatically selects the

range for the measurement based on the input. Autoranging is convenient, but it results in slower

measurements than using a manual range. Autoranging goes up a range at 120% of the present

range and down a range below 10% of the current range. Press More to switch between the two

pages of settings.

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Step 4

The 3A terminals are selected by default. The Terminals softkey toggles between the 3 A

terminals and the 10 A input terminals. When you change this to 10 A, the measurement range

automatically becomes 10 A.

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Step 2: Press [DCI] on the front panel.

Step 3: Press the Aperture NPLC softkey and use the up/down arrow keys to specify integration

time in power-line cycles (PLCs) to use for the measurement. 1, 10, and 100 PLC provide normal

mode (line frequency noise) rejection. Selecting 100 PLC provides the best noise rejection and

resolution, but the slowest measurements.