Omega RD-MV100 Series, User Manual

Page: 278 / 299

14-14
Measuring accuracy in case of scaling (digits) :
Accuracy during scaling (digits) =
measuring accuracy (digits)
×
mult 2 digits (rounded up)
where the multiplier = scaling span (digits)/measuring span (digits).
Example : Assuming that
• range :
6 V
• measuring span : 1.000 to 5.000 V
• scaling span : 0.000 to 2.000
Then,
Measuring accuracy =
±
(0.1%
×
5 V + 2 digits)
=
±
(0.005 V [5 digits] + 2)
=
±
(7 digits)
Multiplier = 2000 digits (0.000 to 2.000)/4000 digits (1.000 to
5.000 V) = 0.5
Accuracy during scaling = 7 digits
×
0.5 + 2 = 6 digits (rounded up)
Reference junction compensation :
Internal/External selectable for each channel
Reference junction compensation accuracy (above 0
°
C) :
Types R, S, B, W :
±
1
°
C
Types K, J, E, T, N, L, U :
±
0.5
°
C
Maximum allowable input voltage :
±
10 V DC (continuous) for ranges of 2 V or less and TC ranges
±
30 V DC (continuous) for 6 V DC and 20 V DC ranges
Input resistance :
Approximately 10 M
Ω
or more for ranges of 2 V DC or less and TC
Approximately 1 M
Ω
for 6 V DC and 20 V DC ranges
Input source resistance :
Volt, TC : 2 k
Ω
or less
RTD : 10
Ω
or less per wire (The resistance of all three wires
must be equal).
Input bias current : 10 nA or less
Maximum common mode noise voltage :
250 Vrms AC (50/60 Hz)
Maximum noise voltage between channels :
250 Vrms AC (50/60 Hz)
Interference between channels :
120 dB (when the input source resistance is 500
Ω
and the inputs
to other channels are 30 V)
Common mode rejection ratio :
120 dB (50/60 Hz
±
0.1%, 500
Ω
imbalance, between the minus
terminal and ground)
Normal mode rejection ratio :
40 dB (50/60 Hz
±
0.1%)
14.7 General Specifications