Digital Multimeter HDM3055 Series Manual

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DC Current

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

Step 1: Configure the test leads as shown.

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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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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.

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

measuring current above 1 A:

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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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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.