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39
The variables are defined as follows.
i, j, k, l, m, n, o, p, q, r, s, t, u
integers
x
real numbers
f
frequency
Note that all numeric variables can be expressed in integer, floating point or exponential formats (i.e., the number
five can be 5, 5.0, or .5E1). Strings are sent as a sequence of ASCII characters.
4.2.1 Reference and Phase Commands
PHAS(?){x}
The PHAS command sets or queries the reference phase shift. The parameter x refers to the
phase (real number, unit: °). The PHAS x command will set the current phase shift to x°.
The value of x is rounded to 0.01°. The phase can be programmed from -180° to +180°. For
example, send command “PHAS -179.0” and the phase shift will be set to -179°. The
PHAS? command queries the phase shift.
FMOD(?){i}
The FMOS command sets or queries the reference source. The parameter i selects external
reference (i=0) or internal reference (i=1).
FREQ(?){f}
The FREQ command sets or queries the reference signal. The FREQ? command will return
the current reference frequency (internal or external).
RSLP(?){i}
The RSLP command sets or queries the trigger way of reference signal when in external
reference mode.
The parameter i selects <TTL> rising edge (i=0) or <Sine> zero crossing (i=1). When the
frequency is less than 1 Hz, the <TTL> reference must be used.
HARM(?){i}
The HARM command sets or queries harmonic detection.The parameter i is an integer
from 1 to 32767. The HARMi command will set the lock-in to detect at the ith harmonic of
the reference frequency. The value i is limited by i*f
≤
120 kHz. If the value of i and f
exceeds 120 kHz, then i will be set to the maximum value that meets i*f
≤
120 kHz.
4.2.2 Input and Filter Commands
ISRC(?){i}
The ISRC command sets or queries the input configuration.
The parameter i selects A (single input mode) (i=0), A-B (differential voltage input mode)
(i=1), I (1 MΩ) (current input and the expand is 10
6
V/A) (i=2) or I (100 MΩ) (current input
and the expand is 10
8
V/A (i=3).
IGND(?){i}
The IGND command sets or queries the input shield grounding. The parameter i selects
Float (i=0) when the input ground is connected to the instrument ground with a 10 kΩ
resistor or Ground (i=1) when the input ground is connected to the instrument ground with
a 10 Ω resistor.
ICPL(?){i}
The ICPL command sets and queries the input coupling. The parameter i selects AC (i=0)