Microchip LN-CSAC-SA65 handleiding
Handleiding
Je bekijkt pagina 32 van 50
LN-CSAC Model SA65-LN User’s Guide
DS50003805A-page 32 2024 Microchip Technology Inc. and its subsidiaries
3.3.2 Frequency Adjustment (F)
The output frequency of the LN-CSAC may be adjusted (steered) through the commu-
nications port. The internal resolution of the fractional frequency correction is approxi-
mately 1 × 10
–12
. The correction is entered in integer units of ×10
–15
. The maximum
allowed correction is ±20000000 (2 × 10
–8
). Corrections may be applied as either Abso-
lute or Relative, depending on the first character following the !F, that is !FA or !FD for
absolute or relative (delta) respectively. In the case of absolute steering, the value of
the Steer register is replaced with the new value.
In the case of relative (delta) steering, the new value is summed with the existing value
in the Steer register, that is, two relative corrections of –10000 result in a total offset of
–2 × 10
–11
. The current steering value is reported in the steer field of the telemetry in
units of × 10
–12
.
Note that the reported value of Steer reflects all current steering corrections including
the User Steer (entered with !F) as well as the current steering inputs from Disciplining
(see Section 2.10 “1 PPS Disciplining”)
The format for the Adjust frequency command is !FYXXXXX[CRLF] where Y is either
A or D and XXXXX is the new correction in × 10
–15
.
Example: Apply absolute tuning correction of –1.23 × 10
–10
:
Command: !FA-123000[CRLF]
Unit response: Steer = -123[CRLF]
Example: Apply delta tuning correction of –1.23 × 10
–10
:
Command: !FD-123000[CRLF]
Unit response: Steer = -246[CRLF]
Example: Report current value of steer:
Command: !F?[CRLF]
Unit response: Steer = –246[CRLF]
The contents of the Steer register are volatile. Steer is reset to 0 when power is cycled
to the LN-CSAC. In many cases, it is desirable to preserve the steer upon power-down
(for example, calibration of the LN-CSAC). This is accomplished by sending a Fre-
quency Latch command to the LN-CSAC, which updates the internal calibration (stored
in non-volatile memory) according to the current value of the Steer register and resets
Steer to zero. Note that the Latch command is only valid when the LN-CSAC is locked
(Status = 0).
Example: Latch the current steer value:
Command: !FL[CRLF]
Unit response: Steer Latched [CRLF] Steer = 0[CRLF]
Note: The telemetry interface allows users to send commands at a rate up to the
baud rate. However, sending commands, specifically the telemetry com-
mands (6 and ^) may cause unwanted frequency behavior if sent at a rate
faster than 1 Hz. Limit telemetry requests to 1/sec to avoid any unwanted
frequency behavior.
Note: The single-character F is a shortcut for !F?[CRLF].
Note: Once a Latch command is issued, the previously latched value cannot be
recovered. There is no command to restore “factory defaults”.
Bekijk gratis de handleiding van Microchip LN-CSAC-SA65, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
