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Calibration Control
Register
The Calibration Control Register sets and reports calibration conditions.
Address
Base + 08
16
Bit 15 14 13 12 111009080706050403020100
READ Cal
Bus En
A/D
Bsy
Cal Mode Cal Mux
En
Cal Mux Chan
Address
A/D Reading Value
WRITE Cal
Bus En
A/D
Trg
Cal Mode
Sel
Cal Mux
En
Cal Mux Chan
Address
A/D
Scale
Unused
READ Cal Bus En: A one (1) in this field indicates the cal bus is connected. A
zero (0) in this field indicates the cal bus is not connected. This bit reflects
the state of the last write to Cal Bus En field.
A/D Bsy: A one (1) in this field indicates the A/D is taking a reading. A
zero (0) in this field indicates a new reading is available.
Cal Mode: A one (1) in this field indicates the calibration system is set to
calibrate voltage. A zero (0) in this field indicates the calibration system is
set to calibrate current. This bit reflects the state of the last write to Cal
Mode Sel field.
Cal Mux En: A one (1) in this field indicates the Cal Mux is enabled. A
zero (0) in this field indicates the Cal Mux is disabled (high-impedance).
This bit reflects the state of the last write to Cal Mux En field.
Cal Mux Chan Address: This field returns the channel selected for
calibration. This bit reflects the state of the last write to Cal Mux Chan
Address field. The channel address, expressed in hexadecimal, has values
from 0
16
through F
16
corresponding to channels 1 through 16, respectively.
A/D Reading Value: This field returns the latest reading taken by the A/D.
When A/D Scale is set to 0, the actual voltage represented by the reading
value is given as:
Voltage = 16.8 V −
33.6 V
255 steps
∗ AD Reading Value
When A/D Scale is set to 1, the actual voltage represented by the reading
value is given as:
Voltage = 16.8 V −
33.6 V
255 steps
∗
AD Reading Value
13.7
WRITE Cal Bus En: Writing a one (1) in this field connects the cal bus. Writing a
zero (0) in this field disconnects the cal bus.
A/D Trg: Writing a one (1) in this field begins an A/D reading. Writing a zero
(0) in this field during a reading in progress will corrupt the reading. Do not
combine this bit setting with other bits in this register (write only this bit).
Appendix B HP E1418A Register-Based Programming 129