© Isothermal Technology
Page 81 of 102
923 milliK manual - issue: 1.10
8.5 Units
Numeric parameters may optionally include units (if you omit units, the milliK assumes
appropriate default units). The only units required for milliK are ohms (which are indicated
by ‘R’, ‘r’, or OHM) and volts (indicated by ‘V’ or ‘v’).
The standard multiplying prefixes may also be used to indicate decimal multiples or fractions.
For example, the following are all equivalent:
CAL:VOLT:OFFS1
2E3uV
CAL:VOLT:OFFS1
2
(note: default units are mV)
CAL:VOLT:OFFS1
0.002V
The following prefixes are available:
prefix
name
factor
U or u
micro
10
-6
M or m
milli
10
-3
(cannot be used with ohms, see note below)
K or k
kilo
10
+3
Note: The SCPI standard does not permit the use of ‘M’ or ‘m’ as a prefix for ohms to
indicate milli-ohms since the M or MA prefix is used to indicate mega-ohms.
8.6 Making Measurement Using SCPI Commands
The milliK’s measurement system can be controlled by SCPI commands from either of the
RS232 ports. The software makes no distinction between commands received on either port
and will process these in the order in which they are received. If a response is expected, it
will always be sent to the port on which the initiating command was received.
There is no direct interference between measurements made using the front panel operator
interface and measurements requested using SCPI commands. However, measurements take
some time to complete so there may be a delay in responses to SCPI commands if
measurements are being made via the front panel operator interface. To avoid unnecessary
delays to responses to SCPI commands, you can stop all measurements requested via the
front panel operator interface. To do this, restart the milliK but do not press the
Start
(F4)
key in the opening window. The main application that provides the user interface will then
not start and no measurements will be requested.
