Table 5-1 Measurement Unit Commands - Keithley 6220 DC User Manual

5-12 Delta, Pulse Delta, and Differential Conductance
The default units for the Model 622x is volts. With Ohms (Ω) units or Siemens (S)
units selected, a reading is calculated as follows:
Ω = V/I
S = I/V
Where: V is the Delta, Pulse Delta, or Differential Conductance voltage reading.
With Power units selected, power is calculated as follows:
Delta
W = I x V
1.
2.
Setting measurement units
From the front panel, units can be set as follows:
1.
2.
3.
4.
Remote programming – Commands for setting units are listed in
Table 5-1
Measurement unit commands
UNIT[:VOLT][:DC] <name>
UNIT:POWer[:TYPE] <name> Set power units reading type for 6221
UNIT:POWer[:TYPE]?
* The <name> parameter for Siemens can be sent as S, SIEM, or SIEMENS.
Example – Selects power (W) measurement units for the Model 622x:
UNIT W
I is the current sourced by the Model 622x.
Pulse Delta
W = I x V
PEAK
W = I x V x Duty Cycle
AVG
See Section 5 of the Reference Manual for details on "Peak power and
Average power" for Pulse Delta.
See Section 5 of the Reference Manual for details on "Average Voltage and
Power" for Differential Conductance.
Press the UNITS key to display the READING UNITS menu.
Use the "Menu navigation" controls (see
measurement units (VOLTS, OHMS, WATTS, or SIEMENS).
Model 6221 only – After selecting WATTS, you will be prompted to select
the POWER TYPE.
Select the desired power type (AVERAGE or PEAK).
Command
Return to
1
Differential Conductance
W = I
page
Description
Specify reading units*.
<name> = V, OHMS, W, or SIEMens
Pulse Delta.
<name> = AVERage or PEAK
Query power units reading type
Section 5 topics
Model 6220/6221 User's Manual
x V
AVG AVG
1-14) to select the desired
Table 5-1
Default
V
PEAK
2
.