USB DrDAQ User's Guide
31
Copyright © 2013 Pico Technology Ltd. All rights reserved.
usbdrdaq.en r4
For external sensors, this resistor should be fitted in the sensor. You must use one
of the following resistors: 1k0, 2k2, 3k3, 5k6, 7k5 or 10k. The resistor must be 1%
tolerance or better.
For internal sensors, use the following 'virtual' resistor values:
1
Sound Waveform
1200
2
Sound Level
1300
3
Scope (voltage)
1500
4
Resistance
1600
5
pH
1400
6
Temperature
1100
7
Light
1000
LongName=Temperature
Used in PicoLog
ShortName=TempC
This field is not used by USB DrDAQ running PicoScope or PicoLog.
Units=C
Displayed on graphs
MinValue=-40
MaxValue=120
Note: For PicoScope these values will determine the maximum and minimum
values displayed in Oscilloscope View. For PicoLog these values determine what
Maximum range is displayed in the Graph View (set in the
Graph Options
dialog).
Places=1
Number of decimal places. The options are 0, 1, 2 and 3. With
places=1
the value
15.743 would be returned as 157, meaning 15.7. With
places=2
, the same value
would be returned as 1574.
Method=0
This specifies the scaling method. 0 specifies table lookup and 1 specifies linear
scaling.
Offset=0
Gain=1
These are the offset and gain values for linear scaling.
OutOfRange=0
This specifies what to do if the raw value is outside the range of the table lookup.
The options are:
0 - treat as a sensor failure.
1 - clip the value to the minimum or maximum table value.
2 - extrapolate the value using the nearest two table entries.
