Acromag, Inc. Tel: 248-295-0880
- 31 -
Model SP33X-0700
4-Wire DC I/V Signal Splitter w/USB
Input...continued
Input Resolution:
The A/D in these splitters divides its input signal into parts
calculated by subtracting endpoint A/D counts computed via (Vin*Gain/1.25)*
32768+32768. Vin is the voltage after applying the input divider and gain to the
signal (see Table 1). Ranges that share the same gain are calibrated by extrapolating
from their nominal input range calibration. Internally for simplification, the raw A/D
counts indicated in Table 1 are normalized to ±25000/15.5 bits for
100% (bipolar
ranges), or 0-25000/14.5 bits for 0-100% (unipolar ranges), and the effective input
resolution of a range will be the lesser of the raw resolution indicated in Table 1 or
this normalized resolution. The effective resolution of an I/O conversion will be the
lowest resolution of the A/D, its normalized value, or the output DAC (see Output).
Output DAC resolution is 1 part in 43690 for 4-20mA output.
Table 1: SP INPUT RESOLUTION PER INPUT RANGE/MODEL
SPx36 INPUT RANGE
xDIVIDER
xGAIN
A/D INPUT RESOLUTION
1
-20mA to +20mA (TB1)
24.9Ω Shunt
2
6658 to 58878 or 1/52220
0 to 20mA (TB1)
24.9Ω Shunt
2
32768 to 58878 or 1/26110
4 to 20mA (TB1)
24.9Ω Shunt
2
37990 to 58878 or 1/20888
0 to 11.17mA (TB1)
24.9Ω Shunt
2
32768 to 47350 or 1/14582
-1mA to +1mA (TB1)
24.9Ω Shunt
32
11880 to 53656 or 1/41776
-0.5V to +0.5V DC (TB2)
NONE
2
6554 to 58982 or 1/52428
0 to 500mV DC (TB2)
NONE
2
32768 to 58982 or 1/26214
SPx37 INPUT RANGE
xDIVIDER
xGAIN
A/D INPUT RESOLUTION
1
-1V to +1V DC (TB1)
NONE
1
6554 to 58982 or 1/52428
0 to 1 DC (TB1)
NONE
1
32768 to 58982 or 1/26214
-10V to +10V DC (TB2)
86.6K/1084.6K
1
16023 to 53699 1/41862
-5V to +5V DC (TB2)
86.6K/1084.6K
1
22302 to 43233 or 1/20931
0 to 10V DC (TB2)
86.6K/1084.6K
1
32768 to 53699 or 1/20931
0 to 5V DC (TB2)
86.6K/1084.6K
1
32768 to 43233 or 1/10465
SPx38 INPUT RANGE
xDIVIDER
xGAIN
A/D INPUT RESOLUTION
1
-15V to +15V DC (TB1)
56.2K/1054.2K
1
11805 to 53730 or 1/41925
0 to 15V DC (TB1)
56.2K/1054.2K
1
32768 to 53730 or 1/20962
-150V to 150V DC (TB2)
5.36K/1003.36K
1
11762 to 53774 or 1/42012
-75V to +75V DC (TB2)
5.36K/1003.36K
1
22265 to 43271 or 1/21006
0-150V DC (TB2)
5.36K/1003.36K
1
32768 to 53774 or 1/21006
0 to 75V DC (TB2)
5.36K/1003.36K
1
32768 to 43271 or 1/10503
1
Note: AD_count = (Vin*Gain/1.25) * 32768+32768
.
Optional AC Current Sensor (Model 5020-350, for AC Current IN to SP336 at TB1):
Optional sensor can be connected to TB1 of the SP336 model for AC current sensing
and is a toroidal instrument transformer that converts the sinusoidal 50-60Hz AC
current signal into low level 0 to 11.17mA DC. The input AC current range is a
function of the number of turns placed through the toroid as shown in Table 2 below.
This sensor is isolated and requires no calibration or adjustment. When used with a
SP336 module, it also facilitates AC current input isolation from the ADC voltage
input, as well as redundant input isolation with respect to each output of this
transmitter.