FUTEK IPM500 (D500) Digital Display - Manual (Page 23)

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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. Use 2.5 mm (0.1") jumpers.
2.
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
can be set for direct readout in (milli)volts or (milli)amperes. Decimal point selection does not
affect the counts. For example, a 20V input may be displayed as 20.000V or 20000 mV.
Voltage Ranges
Full Scale Input Counts Jumpers
200 mV
2V
20V
200V
300V (UL)
600V (not UL) 20000
20000
20000
20000
3000
6000
j
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 f
none