Tbksetfreq, Tbksetmode – Measurement Computing TempBook rev.3.0 User Manual
Page 81
TempBook User’s Manual
tbkCommand Reference (Standard API) 9-21
tbkSetFreq
DLL Function
int tbkSetFreq(float freq);
C
tbkSetFreq(float freq);
QuickBASIC
BtbkSetFreq% (ByVal freq!)
Visual Basic
VBtbkSetFreq% (freq!)
Turbo Pascal
tbkSetFreq( freq:real ):integer;
Parameters
float freq
The sampling frequency in Hz
Valid values: 100000.0 - 0.0002
Returns
TerrNoError
- No error
See Also
tbkGetFreq, tbkSetClk
Program References
None
tbkSetFreq
calculates then sets the frequency of the pacer clock using the specified frequency in
Hz. The frequency is converted to two counter values that control the frequency of the pacer clock.
In this conversion, some resolution of the frequency may be lost. tbkRdFreq can be used to read
the exact frequency setting of the pacer clock. tbkSetClk can be used to explicitly set the two
counter values of the pacer clock. The pacer clock can be used to control the sampling rate of the
A/D converter.
tbkSetMode
DLL Function
tbkSetMode(uchar di_se, uchar polarity);
C
tbkSetMode(unsigned char di_se, unsigned char polarity);
QuickBASIC
BtbkSetMode% (ByVal di_se%, ByVal polarity%)
Visual Basic
VBtbkSetMode% (ByVal di_se%, ByVal polarity%)
Turbo Pascal
tbkSetMode( di_se:byte; polarity:byte ):integer;
Parameters
uchar di_se
Zero value causes TempBook to go to single-ended mode (power-on default).
Non-zero value causes differential mode.
uchar polarity
Zero value causes TempBook to default to Unipolar mode. Non-zero value causes default Bipolar
mode. All ADC conversions except those started with
tbkSetScan
will use the default polarity.
Returns
TerrNoError
- No error
See Also
Program References
None
tbkSetMode
is used to program the gain amp for single-ended or differential operation and to set
the default polarity.
Single-ended operation measures the voltage of the selected channel referred to analog ground.
Differential operation measures differences in voltage between a pair of selected channels.
Polarity is unipolar or bipolar:
•
Unipolar maximum voltage range is 0 to +10 V
•
Bipolar maximum voltage range is -10 to +10 V.