Laurel Electronics LAUREATE SERIES 2 DIGITAL PANEL METER User Manual

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13. AC TRUE RMS VOLTS & AMPS INPUT

AC voltage or current measurement utilizes the True
RMS signal conditioner board which uses precision
circuitry to compute the root-mean-square of complex
waveforms from 10 Hz to 10 kHz. Accurate measure-
ments are obtained with spikes up to 3 times the
maximum of each range. The input can be AC
coupled to read only the AC component, such as
ripple on a power supply, or DC coupled to read AC
plus DC. The board needs to be configured via
jumpers for the desired voltage or current range, and
for AC or DC coupling. All signal ranges are factory
calibrated with calibration factors stored in EEPROM.
The meter software recognizes the board and will bring up the appropriate menu items for it;
however, it does not recognize the jumper settings. These need to be set manually. Please
see further manual sections for setup of the following features: relay output (16), analog output
(17), and communications (18).

RANGE SELECTION VIA JUMPERS

1. Letters indicate jumper position. Jumpers
are installed on pins adjacent to letters.
2. Use 2.5 mm (0.1") jumpers.
3. Store spare jumpers on unused jumper post.

METER SCALING

Refer to the above tables for the full scale counts (or displayed digits) produced by the
available full scale input ranges with a scale factor of 1 and an offset of 0. The decimal point

Voltage Ranges

Full Scale Input

Counts

Jumpers

200 mV
2V
20V
200V
300V (UL)
600V (not UL)

20000
20000
20000
20000

3000
6000

c, g, h

c, i

c, k

c, m
c, m

Current Ranges

Full Scale Input

Counts

Jumpers

2 mA
20 mA
200 mA
5A

20000
20000
20000

5000

l, k

b, m
a, m

c, d, e, m

AC or DC Coupling

Coupling Type

Jumpers

DC coupling for AC + DC
AC coupling for AC only

none