Measurement Computing TempScan/1100 - Manual (Page 57)

TempScan / MultiScan User's Manual 889897 Scanning Cards 3-9
Fault Detection: Open thermocouple may be detected by a software query.
Cold Junction Sensors: One for every 8 input channels.
Linearization: Performed by lookup table (varies by T/C type); table supports two user-defined custom
T/C types of up to 256 points each. Lookup tables are stored in battery backed-up NV-RAM.
Input Impedance: 1 MOhm
Input Bias Current: 20 nA max
Maximum Allowable Input:
± 25V rms
Maximum Common Mode Voltage: 200 VDC or AC peak. Specified for coupling impedance > 30
MOhm, and common mode frequency < 60 Hz. Maximum 300 VDC or AC peak before equipment
damage occurs.
Maximum Normal Mode Voltage: 10 VDC or AC peak
Channel to Power Ground Isolation: 200 V peak
Channel to Channel Isolation: 200 V peak
Temperature Coefficient:
< (0.1 x rated accuracy)%/°C.
Digital Filtering: Averages 32 samples @ 50/60 Hz for line-cycle noise rejection (DCV and thermocouple
measurements)
Voltage Range, Accuracy and Resolution: Range is based on maximum peak-to-peak signal for AC volts.
Accuracy is based on AC voltages where the frequency of the input signal is an integer multiple of the
AC line cycle
± 1.0%, and with line-cycle integration enabled.
Range Accuracy Resolution
± 100 mV; ± 0.02% of range; 3.12 µV/bit
± 1 V; ± 0.02% of range; 31.2 µV/bit
± 5 V; ± 0.02% of range; 156 µV/bit
± 10 V; ± 0.02% of range; 312 µV/bit
MTC/24 Description
The MTC/24 thermocouple/volt scanning card contains 24 isolated differential input channels. Each
channel can be programmed to receive inputs from thermocouple types J, K, T, E, R, S, B, and N, or from
any of the following voltage ranges: ±100 millivolts, ±1 volt, ±5 volts and ±10 volts. Regarding
thermocouples, temperature values can be returned in any of the following units: °C, °F, °K, °R, or mV.