Measurement Computing TempScan/1100 - Manual (Page 116)

5-26 System Operation 889897 TempScan / MultiScan User's Manual
Real-Time Clock
The TempScan/1100 or MultiScan/1200 contains a battery-backed-up internal real-time clock which is
programmable when set and read. Factory set according to Eastern Standard Time (U.S.), the real-time
clock runs in military time. Although setting the real-time clock time via the Set Real-Time Clock (
S
)
command, and setting the Trigger (trigger start event) and Stop (trigger stop event) times via the Program
Trigger Times (
P
) command, are done at a resolution of only 0.1 second (tenths of a second), the real-time
clock actually operates at a resolution of 0.001 second (milliseconds). This millisecond resolution is
evident in the Time/Date stamping of channel data output which is retrieved from the High/Low/Last (HLL)
Registers or the Acquisition Buffer.
For more information on setting the real-time clock, see command Set Real-Time Clock (
S
) in the chapter
API Command Reference. For more information on Time/Date stamping and data formats, see section
Stamping Configuration and section Data Format Configuration in the chapter System Configuration.
Open Thermocouple & Range Error Checking
The TempScan/1100 or MultiScan/1200 unit possesses built-in utilities for the detection of open
thermocouple and range errors on configured channels, as follows:
• One hardware utility: The thermocouple cards contain circuitry to detect open thermocouples.
• Two software utilities: The software detection routines are designed to detect if the input A/D reaches
its maximum value, and to detect if an input exceeds the linearization limits.
If an open thermocouple or a range error is detected, then Bit 5 in the Error Source Register (
ESC
) will be
set. In turn, Bits 2 to 7 (including Bit 5) in the
ESC
will together be mapped into the Execution Error Bit
(Bit 4) in the Event Status Register (
ESR
), denoting that this particular error condition exists. The offending
channel(s) can be determined by reading their values. If a channel is in error, its value will be the
following:
• If a Thermocouple channel (assuming degrees Celsius):
±3276.70
.
• If a Volts channel for the TempScan/1100 unit:
±32.7670
.
• If a Volts channel for the MultiScan/1200 unit:
±005.767
.
Note: Open thermocouple and range error checking is only performed on configured channels.
Software Digital Filtering (TempScan/1100 Only)
As a standard feature, the TempScan/1100 employs an advanced software digital filter to ensure quiet and
accurate thermocouple input. This feature is enabled as part of the factory default settings. With the Set
Software Digital Filtering (
*W
) command, this digital filtering feature can be disabled in order to improve
reaction response time, or re-enabled to reinstate the feature.
For information on MultiScan/1200 noise filtering, see section Measuring Modes (MultiScan/1200 Only) in
the chapter System Configuration.