HP E1563A, Руководство пользователя, Страница: 53 / 166

Digitizer Command Reference 53
:VALue?
CALibration:VALue? queries the present setting of the calibration voltage.
:ZERO
CALibration:ZERO[<channel>] [<samples>][,<rate>] initiates an offset
calibration for the current range on the specified channel using an internal short.
The following steps must be completed prior to executing a zero calibration:
•
Set the CAL:STATe ON to allow calibration to occur.
•
Set the digitizer to the desired range and filter on the channel you
want to calibrate with the VOLTage[<channel>]:RANGe <range> and
INPut[<channel>]:FILTer:FREQ <freq> and :FILTer:STATe ON|OFF
commands.
•
Errors will result if the above steps are not performed before CAL:ZERO.
Parameters
Comments
•
Optional parameters that are left blank are filled from left to right. Therefore,
it is necessary to use the syntax DEFault to note that a particular parameter is
to use the default value. For example, to specify a sample rate other than the
default, you must declare DEFault for the <readings> parameter or the <rate>
parameter value you intended will be used to fill in the <readings> parameter.
The command for channel 1 would appear as: CAL:ZERO1 DEF,.002.
•
The number of samples and the sample rate would normally be set to DEFault
values to provide averaging over an integral number of either 50 Hertz or 60
Hertz power line cycles. This allows the calibration to cancel out any noise that
is periodic with the power supply. Specifying a value other than DEF for
<samples> and/or <rate> will result in those values being used for the zero
offset calibration.
•
Executable when initiated: No
•
Coupled Command: No
•
Reset (*RST) Condition: None
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
samples numeric 25 to 4000 | DEFault none
rate numeric 1.25E-6 to reference
period * 8,388,607
| DEFault
Seconds