1 scan settings (f1), 2 timing settings (f2), Figure 13 measurement process block diagram – Fluke 1595A User Manual
Page 49: Scan settings (f1), Timing settings (f2)
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Menus and Screens
Main Menu
The following are complete descriptions of each function key.
5.7.3.1 SCAN SETTINGS (F1)
MAIN MENU | MEASURE MENU |
Scan Settings is used to set up channel scanning. The Super-Thermometer has several scan options that are
configured using the following fields.
SCAN ENABLE- turns scanning on or off by using the Left/Right Arrow Keys and pressing the ENTER key.
ON enables automatic sequencing through all enabled channels. OFF disables scanning so only one channel is
measured as selected by the user.
REPEAT COUNT- determines how many times a channel is measured before the Super-Thermometer contin-
ues to the next channel in the scan sequence. The setting has a range of 1 to 100.
ALTERNATE REFERENCE- automatically measures the reference channel after each individual channel is
measured in the scan sequence. This feature is useful in comparison type calibrations when the heat source is
not very stable.
REFERENCE CHANNEL- the setting that determines which channel is the reference channel for Alternate
Reference. The channel chosen for REFERENCE CHANNEL must be enabled (Section 5.7.1, CHANNEL
5.7.3.2 TIMING SETTINGS (F2)
MAIN MENU | MEASURE MENU |
The Timing Settings screen contains the settings and function keys needed for the configuration of measure-
ment timing. The timing settings control the measurement process and the length of time it takes to produce
and display a measurement.
Measurement Timing Description
The measurement timing settings allow the user to be in control of each phase of the measurement process.
These settings enable the user to optimize timing for different applications.
To help describe the measurement process, it is broken into the following five steps.
Figure 13
Step 1
Sampling
Defined by:
Sample Period
Step 2
Averaging
Enabled with:
Average Enable
Step 3
Filtering
Enabled with:
Digital Filter
Enable
Step 4
Conversion
Defined by:
Probe Conversion
Step 5
Display
Defined by:
Display Interval
Measurement Process Block Diagram
1. Sampling - the fundamental measurement of the Super-Thermometer is the resistance ratio. The
fundamental ratio measurement is sampled once per Sample Period.
2. Averaging - the fundamental ratio measurements can be averaged (see Average Enable below) or
passed directly to Filtering. The number averaged is the number of measurement samples taken during
one Display Interval (how often the measurement display is updated). For example, if Sample Period
is set to 2 seconds and Display Interval is set to 10 seconds, 5 ratio measurement samples are averaged
per Display Interval. The display is updated with the statistical mean of the 5 measurement samples.
If AVERAGE ENABLE is OFF, only the most recent ratio measurement sample will be passed to
Filtering.
3. Filtering - after Averaging, the measurement samples can also be processed with a digital filter
(configured by using the Digital Filter function key, Section 5.7.3.3, DIGITAL FILTER (F3), on page