FUTEK IHH200 Digital Display User Manual
Page 23
10 Thomas, Irvine, CA 92618
USA T (949)-465-0900 F (949)-465-0905
IHH200 Manual 2.5 - Page 23
Millivolt pert Volt Calibration Procedure
This procedure outlines how a millivolt per volt calibration might be undertaken.
1.
Ensure that the factory settings for gain and offset are set to 1 and 0, respectively. See millivolt per volt
calibration section to do this.
2.
Begin by connecting up the model IHH200 and a high precision Multimeter to the calibration source set at
2.5mV/V with a 350Ω load.
3.
Take readings at 2.5mV/V and 0mV/V on both the model IHH200 and the high precision Multimeter.
4.
Record your excitation reading.
5.
To convert Multimeter reading to a millivolt per volt reading, divide the output reading on the meter by the
measured value of excitation.
6.
The gain is then calculated by dividing the difference in the span of the Multimeter readings by The model
IHH200 reading.
7.
This value can then be entered into the millivolt per Volt Calibration menu under
5.0 gAIn then press
to
confirm.
8.
The offset of the model IHH200 is derived by subtracting the 0mV/V Multimeter reading from the model
IHH200 reading.
9.
Again, enter this under
5.0 OFFS in the millivolt per Volt Calibration menu then press
to confirm.
Output Voltage (mV)
millivolts per volt (mV/V)= ---------------------------
Excitation (V)
[ 1 ]
IHH200 Reading e.g.
0.000338mV/V @ 0mV/V
2.47993mV/V @ 2.5mV/V
Multimeter Reading e.g.
12.234mV @ 2.5mV/V
000.001mV @ 0mV/V
Excitation - 4.8939 V @ 2.5mV/V
Excitation - 4.8918 V @ 0mV/V
Setup Diagram
Using formula above [1]:
0.000204423mV/V @ 0mV/V
2.499846mV/V @ 2.5mV/V
Calibration Source
2.5mV/V @ 350 Ω
IHH200 (mV/V)
Multimeter (mV/V)
0 mV/V
0.000338
0.000204423
2.5mV/V
2.47993
2.499846
1. Gain = ¨ Multimeter reading / ¨ IHH200 reading = (2.49984 - 0.000204423) = 1.008008mV/V (6dp)
(2.47993 - 0.000338)
2. Offset = Multimeter reading - IHH200 reading = 0.000204423 - 0.000338 = - 0.000096mV/V (6dp)