Stanford Research Systems SIM918, Руководство по эксплуатации и обслуживанию, Страница: 51 / 68

3.4 Commands 3 – 19
by OLSR? or *CLS , the overload status bits will stay cleared even
though the overload condition may persist and remain reported
by
OVLD? .
OVLD? Example:
6
implies that the bias is not overloaded; the transimpedance stage
( V
bias
− i
in
× R
F
) is overloaded; and the output is overloaded.
Reference Clock State RCLK?
Query the current source and lock state of the reference clock
of the preamplifier. The responses are
INTERNAL 0
,
EXTERNAL 1
,
and UNLOCKED 3 .
This command complements the RCSR status register described in
Section 3.5.9, but there is no one-to-one correspondence between
the response of
RCLK? and bits in RCSR. Once cleared by RCSR?
or *CLS , the reference clock status bits will stay cleared even though
the reference clock state may persist and remain reported by RCLK? .
RCLK?
Example:
UNLOCKED
3.4.8 Interface commands
The Interface commands provide control over the interface between
the SIM918 and the host computer.
Reset
*RST
Reset the SIM918 to its default configuration.
*RST sets the following:
1. Gain to 10
6
V
/
A.
2. Autozero on.
3. Input connected.
4. Input shield to ground.
5. Bias to ground.
6. Bias shield to ground.
7. Reference clock direction to input.
8. The phase-locked loop to inactive when autozero is o
ff
( APLL
OFF
).
9. Clock oscillator to stop during idle time ( AWAK OFF ).
SIM918 Precision Current Preamplifier