EDI CTT-2 Руководство по эксплуатации - Страница 4
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Печатать страницу7 Baud rate
There are two commands for setting the Baud rate. The 'brxxxxx' command changes the rate
when issued, but does not store it in eeprom. The 'bsxxxxx' command stores the new Baud rate
in eeprom but does not change the rate until the next time the power is turned off and on.
8 CTT-2 Command list:
8.1
'Brxxxxx' sets baud rate. Only 9600, 19200, 38400 allowed.
8.2
'Bs' stores baud rate for power-up default.
8.3
'faxxxxxx' returns impedance and relative at xxxxxxHz.
8.4
'f+' increments frequency one step. See 'Sf' command.
8.5
'f-' decrements frequency one step.
8.6
'fxxxxxx' returns impedance only.
8.7
'Ix' turns on LED 1, 2, or 3.
8.8
'ix' turns off LED 1, 2, or 3.
8.9
'Ibx' starts LED 1, 2, or 3 flashing at a 2.5Hz rate. Use 'ix' to turn off.
8.10
'l' starts leakage test, returns ohms.
8.11
'Lxxxxx' sets the leakage test time in mS. Default is 3000mS.
8.12
'Sdxxxxx' sets dwell time in uSec. Use >1000 uS for accuracy.
8.13
'Sfxxxxxx' sets sweep frequency step in Hz.
8.14
'Ssxxxxxx' sets the number of steps used in the sweep.
8.15
'S' returns sweep frequency start, step, number of steps, and delay.
8.16
'saxxxxxx' sweeps, returns all data for each frequency point.
8.17
'smxxxxxx' sweeps for minimum, maximum Z starting at xxxxxx Hz.
8.18
'szxxxxxx' sweeps, returns only Z for each frequency point.
8.19
'Cfxxxxx' calibrates the output frequency, 1 ppm/count. Nominal is 10000.
8.20
'Cm' stores the cal data to eeprom. Reads in on power-up.
8.21
'Co' calibrates readings >5K ohms. Nominal value is 2.
8.22
'Cr' calibrates for reference resistor. Nominal value is 104.
8.23
'Cs' calibrates readings for 0 ohms. Nominal value is 2022.
8.24
'Cz' prints stored and current calibration values.
8.25
'Cv' prints power supply voltage. Range is 9 to 16 VDC.
8.26
'?' prints the firmware version and a help file.
8.27
'/' prints the firmware version.
9 Calibration
9.1
Calibration should be checked every two years or any time the readings are in doubt.
9.2
Equipment required: 5100 ohm 1% resistor, a 510 ohm 1% resistor, a 10 ohm 1%
resistor, and a frequency counter capable of reading 100KHz with a 1PPM timebase.
9.3
Frequency calibration
9.3.1
CTT-2 Manual V1.01
Connect a frequency counter to the transducer connector. Type 'f100000' and
read the counter. The frequency should be within +/- 20Hz. If it is not, the
CTT-2 must
be returned to the factory for repair.
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