132
Options List
TIME
UTC
FREQUENCY
60 Hz
Viewing the Measurements
View the measurements on the front panel display as follows:
1. Press the SYSTEM key repeatedly until it states OPTION STATUS and press ENTER. Observe the
following display on the front panel (values are representative):
SYSTEM
∆
F -0.0010 Hz
∆
T +0.0000 Sec
2. Press the UP or DOWN key again and the following is displayed:
SYSTEM FRQ 59.993 Hz
Time 19:39:25.4327
3. Press the UP or DOWN key again and the following is displayed:
SYSTEM INPUT 114.91 V
Phase 359.60
◦
B.9.5
Calibration
The clock is now configured for operation. Calibration for phase and amplitude may be further performed.
Specifically, these calibrations have no effect on system time and frequency measurements, and are
unnecessary if only time and frequency are required.
Uncalibrated phase accuracy is usually less than 0
.
3
◦
, and can be reduced to 0
.
1
◦
typical and 0.2 degree
guaranteed with calibration. Uncalibrated amplitude accuracy is usually less than 1%, which is the typical
performance of this measurement. Amplitude accuracy is not guaranteed, and amplitude measurements are
provided primarily to verify that the unit is properly connected and receiving the expected signal level.
B.9.6
Phase Calibration
Phase calibration has been performed at the factory, and the calibration factor (which must be entered into
the clock non-volatile memory for it to be effective) is supplied with the assembly. Entering this factor into
the clock requires connecting the clock to a computer or terminal via the RS-232 interface. For the computer,
use a terminal-emulation program such as Procomm, Windows HyperTerminal or Tera Term Pro
. Send the
character V to the clock to check that connections and port settings are correct. The clock should respond
with the firmware dates in the format 02 Apr 2014 Opt. 26 Jul 2013.
To send the phase calibration factor to the clock, key in the message:
dd.dd,1201PC
Where dd.dd is the calibration factor in degrees, for example -0.16; and 1201 is the key (clock model
number – a security key to prevent unintentional modification):
-0.16,1201PC
1
To download Tera Term Pro, see the Arbiter Website and select “Service/Support
>
Downloads.”
